研究者詳細 - 藤原　健史

その他リンク： https://link.springer.com/article/10.1007/s11356-024-34485-2/fulltext.html

脱炭素化に向けた廃棄物由来バイオガスのごみ収集への有効利用に関する研究査読

山下温大, 宗村健太, 藤原健史, 哈布尓

環境システム計測制御学会(EICA) 2023年10月

Application of an Integrated Granular and Suspended Sludge Methane Reactor for a Two-Stage Anaerobic Digestion System to Deal with Biodegradable Municipal Solid Waste 査読

Pham Van Dinh, Takeshi Fujiwara

Fermentation 9 ( 8 ) 1 - 12 2023年8月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study aims to investigate the performance of a two-stage anaerobic digestion system using a hybrid methane reactor to deal with biodegradable municipal solid waste. The reactor allowed both suspended sludge and granular sludge to work together. The feedstock was fermented in one continuous stirred tank at different pH conditions for 5 d. Furthermore, the liquid hydrolysate was diluted and pumped into a methane reactor with different organic loading rates. In the fermentative reactor, raising the pH condition from 4.5 to 6.5 caused a sharp increase in volatile fatty acids concentration, mainly due to the increase in acetate and propionate. The efficiency of the methane reactor was proven by the results of hydrodynamic analysis and biogas production. The relationship between biogas production and operating parameters in this reactor was modeled using a quadratic multivariate regression model. Overall, by maintaining the fermentative reactor at a pH of 6.0–6.5, the methane reactor was able to achieve an organic loading rate of 7.6 g-TS.L−1·d−1 with outstanding biogas quality and yield. In terms of microbiology, the most dominant phyla in the reactor included Firmicutes, Bacteroidetes, Proteobacteria, Euryarchaeota, Synergistetes, and Chloroflexi. Among them, the species with the highest relative abundance in granular sludge was Firmicutes, while that in suspended sludge was Bacteroidetes.

DOI： 10.3390/fermentation9080720

Biogas Production and Energy Balance in a Two-Stage Anaerobic Digestion of Fruit and Vegetable Waste: Thermophilic versus Mesophilic 査読

Pham Van Dinh, Takeshi Fujiwara

Fermentation 9 ( 7 ) 1 - 11 2023年7月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

This study aimed to investigate biogas production and energy balance in a two-stage anaerobic digestion system of fruit/vegetable waste under thermophilic and mesophilic conditions. Firstly, the feedstock was hydrolyzed and acidified in an acidic reactor at 37 °C with a retention time of 5 d. Then, the liquid hydrolysate was collected and pumped into an up-flow methane reactor under a mesophilic temperature with a retention time of 5 d and a thermophilic condition with a retention time of 3 d. The experimental results showed that in the thermophilic methane reactor, the COD removal, biogas yield, and methane concentration were 96.3%, 492 mL/g-VS, and 70.4%, respectively. These values were 3%, 10%, and 3% higher, respectively, than those obtained in the mesophilic methane reactor. In terms of energy, the mesophilic and thermophilic methane reactors consumed the same thermal energy demand for temperature control. They were much lower than the heat values produced by the power engine. The two-stage anaerobic digestion system using a thermophilic methane reactor obtained a gross energy of 11.20 kJ/g-VS and a net energy of 9.83 kJ/g-VS. These values were 13.2% and 14.8% higher, respectively, than those obtained by the system with a mesophilic condition. Moreover, the use of a thermophilic reactor helped reduce the reactor volume by 40%, leading to significant investment cost savings.

DOI： 10.3390/fermentation9070601

Composting Activities in Vietnam – The Situation, Problems, and Challenges 査読

Duy Bao Nguyen, Takeshi Fujiwara, Cuong Le Dinh, Song Toan, Pham Phu

Chemical Engineering Transactions ( 106 ) 613 - 618 2023年

An Analysis of Biodegradable Solid Waste Flow in Vietnam 査読

Cuong Le Dinh, Takeshi Fujiwara, Song Toan, Pham Phu

Chemical Transactions ( 106 ) 619 - 624 2023年

Effects of effluent recirculation on two-stage anaerobic digestion in treatment of biodegradable municipal solid waste 査読

P. V. Dinh, T. Fujiwara, A. N. Peni, C. K. Tran

Global Journal of Environmental Science and Management 9 ( SI ) 35 - 46 2023年

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND AND OBJECTIVES: Advantages such as high stability and high biogas production when recirculating the effluent stream in two-stage anaerobic digestion systems have been demonstrated on a variety of substrates, but there is limited information regarding the use of this practice on organic municipal waste. Therefore, this study aimed to investigate how effluent recirculation affects the two-stage anaerobic digestion of biodegradable municipal solid waste. METHODS: Firstly, biodegradable municipal solid waste substrate was fermented under conditions of 12 percent initial total solids and a temperature of 36 degrees Celsius for 5 days. After that, the substrate continued to be diluted using tap water or the effluent stream with a rate of 2:1. In the case of using the effluent stream, the experiment was further performed with dilution rates of 3:1, 1:1, and 1:2. Then, the liquid part was collected and pumped into the methane reactor at an organic loading rate of 7.64 grams of total solids per liter per day at 36 degrees Celsius. The methane reactor was an up-flow reactor that contained both granular sludge and suspended sludge. The effectiveness of the experimental stages was evaluated through biogas production and chemical oxygen demand removal. FINDINGS: In the fermentative reactor, using the effluent stream to dilute solid-state feedstock helped keep the reactor stable at pH 5.5 without alkali addition. In the case of using tap water for dilution, it required a dose of 115.8 grams and 75.3 grams of sodium hydroxide per kilogram of volatile solids to attain pH conditions at 6.5 and 5.5, respectively. Maintaining the reactor at pH 6.5 increased the concentration of fermentation products compared to pH 5.5, including 5.9 percent total chemical oxygen demand, 5.5 percent soluble chemical oxygen demand, and 10.6 percent total volatile fatty acids. In the case of recirculating the effluent stream in the methane reactor, increasing the dilution rate from 0.5 to 3.0 resulted in a methane yield of 227.5-278.9 milliliter per gram of volatile solids and 85-93 percent chemical oxygen demand removal. The methane reactor’s best digestion performance was attained at recirculation rate 2. Methane formation mainly occurred in granular sludge via the hydrogenotrophic pathway. Methane formation in suspended sludge occurred in a secondary manner, mainly via both the hydrogenotrophic and acetotrophic pathways. Among methanogen families, Methanobacteriaceae was found to have the highest relative abundance (7.5 percent in granular sludge and 0.8 percent in suspended sludge). CONCLUSION: Recirculating the effluent provided significant benefits, including the ability to stabilize the hydrolysis process and increase the methane yield. A recirculation rate of 2 to obtain a total chemical oxygen demand of 35.2 grams per liter was the best condition for methanogenesis. Acetotrophic methanogens were better adapted to difficult conditions than hydrogenotrophic methanogens. The formation of methane mainly occurred in granular sludge via a dominant hydrogenotrophic pathway. Methane formation in suspended sludge occurred in a secondary manner, mainly via both the hydrogenotrophic and acetotrophic pathways. Among methanogen families, Methanobacteriaceae was found to have the highest relative abundance.

DOI： 10.22034/GJESM.2023.09.SI.03

A Perception Survey of Plastic Waste in Floating Villages on Tonle Sap Lake, Cambodia 査読

Habuer, Sakinah, binti Abdullah, Takeshi Fujiwara, Spoann Vin, Phat Chandara, Makoto Tsukiji

Chemical Engineering Transactions ( 106 ) 391 - 396 2023年

バイオガス利用によるごみ収集時の二酸化炭素排出量の抑制-軽油トラックおよび天然ガストラックとEVトラックの評価- 査読

山下温大, 宗村健太, 藤原健史, Habuer

EICA 28 ( 2/3 ) 19 - 27 2023年

ORIENTED-PLANNING SOLID WASTE MANAGEMENT SYSTEM IN VIETNAM TOWARD SUSTAINABILITY - MINIMALISM OR OPTIMIZATION 査読

Song Toan Pham Phu, Takeshi Fujiwara, Cuong Le Dinh

Environmental Engineering and Management Journal 21 ( 9 ) 1533 - 1543 2022年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

In Vietnam, the rapid development of the tourism industry has led to significant challenges in the management of municipal solid waste. In Hoi An city (HAC), the solid waste management (SWM) system in the tourism area (TA) in downtown is facing many urgent problems such as the overload of waste, the inefficiency in the collection system, and the loss of revenues from tipping fee. Aiming to reduce these gaps, five scenarios of the SWM models are built based on the practical issues, the assumption on enhancing of SWM practice, improving the SWM collection, and approving the waste regulation from local government. The optimisation and feasibility of an SWM model were analysed and assessed based on the efficiency of the collection system, the enhancement of recycling practice, the consensus of stakeholders, the favourability for treatment, and the optimisation of economic benefits. The results revealed that the SWM scenario 1 (S1) and S2 get a more positive response from stakeholders (especially commercial sectors) by the high consensus and willingness to pay the higher tipping fee (1.2 times) due to the minimalism in the SWM practice at source. While S3 and S4 clearly show more optimization in sustainable waste management such as techincal efficiency, economic affordability and effective environment. The upgraded process of the SWM system is suggested to gradual apply from S0 to S3 and S4 under the monitoring of the government and the support from social organisations. It should be an oriented-plan of the SWM system in HAC toward sustainability.

DOI： 10.30638/eemj.2022.136

Developing a dataset for the expected anthropogenic mercury release in China in response to the Minamata convention on mercury. 査読国際誌

Habuer, Takeshi Fujiwara, Masaki Takaoka

Data in brief 42 108280 - 108280 2022年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

This paper contains supplementary data in support of a research paper published [1] regarding the expected anthropogenic mercury release in China in response to the Minamata Convention on Mercury (MCM). The dataset provided within this article contains a set of excel spreadsheets. Each spreadsheet contains filtered (collected) and analysed data, i.e., parameters, collected data, calculated and summarized results for mercury distribution by the category of mineral production, intentional uses, secondary metal production, extraction and combustion, and waste treatment in a specific year. The collected (filtered) data in this article consist of the input factor (IF), activity rate data (ARD), output scenario (OS), initial distribution factor (iDF), and redistribution factor (rDF). IF was from the default IF in the United Nations Environment Programme (UNEP) Toolkit Level 2 and published scientific papers. ARD was obtained from the U.S. Geological Survey database, China Statistical Yearbooks, and published scientific papers. The OS content was from the default OS in the UNEP Toolkit Level 2 and published scientific papers. iDF was from the default distribution factor (DF) in the UNEP Toolkit Level 2 and published scientific papers. rDF was from published scientific paper. The mercury input was calculated using IF and ARD. The mercury release to different media in the initial distribution step was calculated using the mercury input and iDF. The release of mercury to the final sinks in the redistribution step was calculated using the amount of sector-specific treatment/disposal, product or by-product, and rDF. The dataset with combination of the collected (filtered) and analyzed data can contribute to an understanding of differences in anthropogenic mercury release before and after implementation of the MCM, especially considering technology transformation in China. Government policymakers involved in hazardous waste management, especially those working on MCM, and engineers and scientists interested in hazardous waste management may benefit from these data. The data can be used for identifying the environmental impact of anthropogenic mercury release before and after the MCM in China. The data can facilitate the creation of strategic management policies for mercury as the MCM is implemented in China.

DOI： 10.1016/j.dib.2022.108280

Greenhouse gas mitigation by integrating waste treatment system toward low-carbon city in Vietnam 査読

Song Toan Pham Phu, Takeshi Fujiwara, Dinh Cuong Le, Duy Bao Nguyen

Blue-Green Infrastructure Across Asian Countries: Improving Urban Resilience and Sustainability 465 - 473 2022年3月

記述言語：英語掲載種別：論文集(書籍)内論文

Environmental pollutions and greenhouse gas (GHG) emissions are among the dark sides of development and have been one of the critical driving forces of climate change. GHG is emitted from various activities, of which the waste treatment system is a significant source. This chapter describes the results of mitigating GHG by enhancing the solid waste management (SWM) system toward a low-carbon society in Hoi An City (HAC), Vietnam. The results showed that landfilling has the highest GHG emission with 808 kg CO2-eq per tonne of waste, while incineration and composting emit on average 438 and 172 kg CO2-eq/tonne of waste, respectively. The average carbon footprint value of waste in optimal SWM system (S3 and S4) is 337 and 307 kg CO2-eq per tonne of solid waste treated. The GHG amount emitted from the minimalist SWM system (S1 and S2) is higher by 547 and 536 kg CO2-eq/tonne of waste treated, respectively. The higher the solid waste management practice, the lower the GHG emission. This study also builds the oriented planning on improving the SWM system in HAC (Vietnam in general) in the next decade. The optimal SWM scenarios (S0-S3-S4) will significantly contribute to mitigating GHG emissions.

DOI： 10.1007/978-981-16-7128-9_21

Optimization of solid waste collection system in a tourism destination 査読

Cuong Le Dinh, Takeshi Fujiwara, Misuzu Asari, Song Toan, Pham Phu

Global Journal of Environmental Science and Management 8 ( 3 ) 1 - 18 2022年3月

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

most famous tourist destinations in the world. This led to a rapid increase in solid waste generation,leading to problems and challenges in solid waste collection and management. This problem is alsobeing experienced by other developing countries of the world. Despite the existence of establishedwaste management strategies, targets set for the collection of recyclable waste have not been met.This study introduces solutions to the problems and challenges faced by the waste managementsector in Hoi An city and other developing countries. This study aimed to i) optimize the map of therecovery recycling stations in an urban community, ii) develop an effective solid waste collectionsystem, and iii) provide management tools to enhance recycling activities, contributing to improvingwaste management in Hoi An city.METHODS: The RRSs were integrated into a solid waste collection system in the urban communitiesof Hoi An City, were conducted through location-allocation analysis in a geographic informationsystem environment. Routing problems of carts were solved in the combination of the reschedulingof existing solid waste collection activities in the study site. The economic evaluation by scenarioswas also calculated for ten years to assess the feasibility of scenarios.FINDINGS: Thirty-four locations were identified and optimized to accommodate the RRSs and newcollection routes. The distances travelled and working time increased in proportion to the increasein waste separation effectiveness. Waste separation is vital to the effectiveness of the new solidwaste collection system. The optimal solid waste practice model (in scenarios 2 and 4) revealedthe positive results in improving the solid waste collection system, operating economy, and localadaptation.CONCLUSION: This study redesigned the solid waste collection system to solve the current problemsin the tourism destination of Hoi An city. This study contributed as a case study of integrating urbanrecovery recycling stations into optimizing a solid waste collection system in a tourism destination.Introducing strict waste separation was the pivotal first step in systematically upgrading the solidwaste collection system in Hoi An City. This study’s findings provide government officials and serviceproviders with methods that can be applied to solve the problems faced by Hoi An city’s existingsolid waste collection and management system.

DOI： 10.22034/GJESM.2022.03.09

Promoting Chinese urban residents’ participation in source separation and recycling 査読

Binxian Gu, Yanbin Yao, Huimin Hang, Yulin Wang, Renfu Jia, Lingxuan Liu, Hui Ling, Xinyi Tang, Haijie Zhang, Zhiwei Wu, Yongxiang Wu, Takeshi Fujiwara, Yanchao Bai

Waste Management 139 290 - 299 2022年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

Source separation and recycling (SSR) for municipal solid waste is an important strategy for the transition to a circular economy and requires broader resident participation. How can residents’ participation in SSR be promoted? Here, we consider 13 cities in Jiangsu as microcosms of China. We quantify residents’ intentions to participate in SSR by distributing a validated questionnaire to 2,963 urban residents, analyze the results through structural equation modeling, and propose localized policy recommendations. We find that residents have positive attitudes toward SSR, although 92.6% of residents in southern Jiangsu were more willing to participate than those in northern Jiangsu (84.6%). Additionally, the influencing factors and their degree of influence on resident SSR participation intentions exhibit disparities across cities. “Accessibility of SSR facilities” simultaneously affects the 13 studied cities and is a key factor. “Environmental knowledge” and “environmental attitudes” are important impact factors, with occurrence frequencies of 84.6% and 69.2%, respectively. However, laws and regulations have no significant effect on residents’ SSR participation intentions. We recommend that the government create favorable external conditions related to facilities and services, promote extensive publicity and educational activities through various channels, and improve the effectiveness of SSR laws and regulations. Future SSR management strategies should be localized, flexible and comprehensive. This research could help decision makers in China and other countries design policy guides to promote SSR and help link current research areas to social development.

DOI： 10.1016/j.wasman.2021.12.032

Effectiveness of oyster shell as alkali additive for two-stage anaerobic co-digestion: Carbon flow analysis 査読

Peni Astrini Notodarmojo, Takeshi Fujiwara, Habuer, Dinh Pham Van

Energy 239 ( Part C ) 2022年1月

Assessment of solid waste collection system-A case study in Hai Chau district, Danang city, Vietnam 査読

Cuong Le Dinh, Song Toan Pham Phu, Takeshi Fujiwara, Tra Qui Phan

2022 7th International Scientific Conference on Applying New Technology in Green Buildings, ATiGB 2022 37 - 42 2022年

担当区分：最終著者掲載種別：研究論文（国際会議プロシーディングス）

Over the last decade, urgent problems related to the waste management system of Da Nang city have been recognized. Therefore, research on the current status of solid waste management system and solid waste collection system is gradually becoming paramount. This study applied Geographic Information System (GIS) and Global Positioning System (GPS) to study the current status of the waste collection system in Hai Chau district, Danang city. The GPS devices were utilized and in-depth interviews were also performed to collect information and data about the waste collection system. Data were synthesized, processed, and analyzed by QGIS 3.4 and Excel 2016. Four teams were in charge of solid waste collection in the entire Hai Chau district. The average daily amounts of solid waste collected were 56t (Team 1), 42.4t (Team 2), 42.6t (Team 3), and 61.1t (Team 4). The coverage ratios and physical duplication ratios of the three teams were 36.5% and 51.1% (Team 1), 55.6% and 47.1% (Team 2), 51.4% and 34.4% (Team 3). The compaction truck of Team 4 only transferred solid waste from transfer station to Khanh Son landfill. The problems and challenges of the solid waste collection system were also highlighted with recommendations for the outcomes.

DOI： 10.1109/ATiGB56486.2022.9984120

Reduction Potential of Anthropogenic Mercury Release in Malaysia 査読

Habuer, Takeshi Fujiwara

Chemical Engineering Transactions 97 205 - 210 2022年

担当区分：最終著者掲載種別：研究論文（学術雑誌）

Anthropogenic release of mercury, human exposure and environmental health are important and mercury management policies are required to effect significant change in Malaysia. To provide a useful information to facilitate the creation of strategic management policies for mercury as the Minamata Convention on Mercury is implemented in Malaysia, there is an urgent need to estimate the potential to reduce mercury release by applying different control measures, i.e. simple electrostatic precipitator and mercury-specific filter. Equally urgent is the need to clarify the alleviated environmental burdens from the reduced mercury releases by applying different control measures. Many researches have explored issues in terms of the mercury’ toxicity and the harm of mercury compounds worldwide. A lack of surveys to evaluate both on the reduction potentials and alleviated environmental burdens of mercury releases resulted in anthropogenic sources under different control measures has been observed. This study estimated the potential reduction and alleviation of the environmental burden of anthropogenic mercury released into the natural environment (air, water and land) in Malaysia under three emission control scenarios and identified the potential reductions. A life cycle impact assessment was applied to estimate an alleviated environmental impact under these scenarios. As a result, the environmental burden can be reduced by 77 % by applying the multipollutant emission control measures such as applying mercury-specific filter for coal combustion compared to no emission control measures. At this maximum, the harm to human health can be reduced by 3,730 disability-adjusted loss of life years and the harm to ecosystems can be reduced by 0.16 species/year. This study will assist decision makers to understand the magnitude of changes resulting from different emission control measures.

DOI： 10.3303/CET2297035

Options for sustainable solid waste management in a tourist city in a developing country 査読

Song Toan Pham Phu, Takeshi Fujiwara, Cuong Le Dinh

Proceedings of Institution of Civil Engineers: Waste and Resource Management 2022年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

A study was undertaken to develop options for sustainable integrated solid waste management for a tourist city in Vietnam. The generation and characterisation of tourism waste were based on a sampling survey of Hoi An city (HAC). Problems and challenges of a tourism waste management system were indicated using material flow analysis. Five scenarios were developed for the tourism sector of the city based on current solid waste management practice (SWMP), a consensus of stakeholders, the suitability of waste management systems and the contribution of the government. In two of the scenarios, waste reduction was 6.5 times higher and recyclables recovered was 3.3-4.2 times greater than that in two of the minimalist scenarios. Furthermore, the former scenarios showed more efficiency in treatment, optimal economy and minimum greenhouse gas emissions. The study indicated the advantages and challenges of each scenario and identified an optimal model for SWMP for the tourism industry of HAC. A framework for gradually developing a sustainable tourism waste management system was proposed, potentially applicable to any tourist city in a developing country.

DOI： 10.1680/jwarm.22.00005

中国阜陽市における家庭廃棄物分別意識の構造解析

廃棄物資源循環学会研究発表会講演集 33 499 2022年

記述言語：日本語出版者・発行元：一般社団法人廃棄物資源循環学会

中国の急速な社会経済発展の中で、家庭廃棄物の量は劇的に増加した。ほとんどの地域は、混合回収システムで家庭廃棄物を収集している。非公式の埋立地の慣行が多くの場合、土地の資源が大幅に失われ、適切な排水管理が不足し、土壌と地下水を汚染する可能性がある。非公式の埋立活動を減らす一つの方法は、家庭廃棄物を分別することだ。計画行動理論に基づき、中国阜陽市の住民を対象に、既存の研究と文献を収集·分析し、アンケート調査を実施した。提案された仮説は、態度、主観的規範、環境認識、政策と広報、知覚的行動制御は、阜陽市住民の家庭廃棄物分別に対する行動意図(I)を強化した。この仮説を評価するために、SPSS AMOS 27を利用してアンケートデータを分析した。分析結論は、政策と広報、環境認知、態度、知覚的行動制御が阜陽市住民の家庭廃棄物分別に対する行動意図に肯定的な影響を及ぼすことが分かった。

DOI： 10.14912/jsmcwm.33.0_499

Home-Composting – A Study on the Simplicity of the System in the Application toward the Effectiveness and Feasibility in Spreading in Vietnam 査読

Pham Phu, Song Toan, Fujiwara, Takeshi, Nguyen, Duy Bao Dinh, Cuong Le

Chemical Engineering Transactions 89 505 - 510 2021年12月

The response of anthropogenic mercury release in China to the Minamata Convention on Mercury: A hypothetical expectation 査読

Habuer, Takeshi Fujiwara, Masaki Takaoka

Journal of Cleaner Production 323 2021年11月

The recyclable waste recycling potential towards zero waste cities - A comparison of three cities in China 査読

Binxian Gu, Xinyi Tang, Lingxuan Liu, Yuanyuan Li, Takeshi Fujiwara, Haohui Sun, Aijun Gu, Yanbing Yao, Ruiyang Duan, Jie Song, Renfu Jia

Journal of Cleaner Production 295 2021年5月

Solid waste collection system in tourism destination – the status, problems and challenges 査読

Cuong Le Dinh, Takeshi Fujiwara, Misuzu Asari, Song Toan Pham Phu

Chemical Engineering Transactions 83 43 - 48 2021年2月

Oyster shell as pH control substitute for two stage anaerobic co-digestion system 査読

Peni Astrini Notodarmojo, Takeshi Fujiwara, Habuer

Chemical Engineering Transactions 83 481 - 486 2021年

Anthropogenic mercury release flow in China 査読

Habuer, Takeshi Fujiwara, Masaki Takaoka

Chemical Engineering Transactions 83 7 - 12 2021年

Analyzing the characterization of municipal solid waste in Da Nang City, Vietnam 査読

Song Toan Pham Phu, Takeshi Fujiwara, Naoya Akasaki, Dinh Cuong Le, Hoang Minh Giang, Pham van Dinh

Chemical Engineering Transactions 83 241 - 246 2021年

車両走行型計測手法を用いた災害廃棄物の定量化手法の開発査読

吉川慶, 西山哲, 藤原健史

EICA 26 ( 2/3 ) 91 2021年

Life Cycle Impact Analysis of Anthropogenic Mercury Release in Malaysia 査読

Habuer, Muhamad Nabil Fikri Bin Abdul Hamid, Takeshi Fujiwara

Chemical Engineering Transactions 89 265 - 270 2021年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

Anthropogenic activities have aroused great concern in terms of the negative impact on ecosystems and human health. With rapid industrial development, Malaysia has experienced problems with regard to mercury pollution. Knowledge of the mercury emission and release inventory, and the main factors that ameliorate the environmental impact of anthropogenic activities, will contribute to environmentally sound mercury management, which is becoming increasingly urgent in Malaysia. In this study, inventories for total mercury emission and release in 2019 were devised to understand pollution sources. A life cycle impact assessment was used to identify the major factors contributing to the overall environmental burden. The environmental impact of anthropogenic mercury releases was compared between (sub)source categories. The total mercury input in 2019 was 36.4 t, of which 30.4 t were released to the natural environment under the output scenario of mercury release with no emission control. The respective amounts of 12.7, 1.8, and 15.9 t of mercury were released to air, water, and land. The environmental burden to terrestrial ecosystem imposed by mercury release was higher than that to freshwater and marine ecosystems. The harm to human health was 4,785 DALY, and harm to ecosystem was 0.85 species/y. The category of coal combustion was the largest contributor to the harms of human health (44 % of total impact), followed by cement production (11 % of total impact), and natural gas extraction and combustion (11 % of total impact). The category of gold mining (no amalgamation) was the largest contributor to the harms to ecosystems (76 % of total impact), followed by coal combustion (11 % of total impact). The result of this study can provide a scientific information to policymaker for strategic management of mercury in Malaysia.

DOI： 10.3303/CET2189045

Waste Segregation at Source and Separately Collection - The Inadequacy in Implementation in Vietnam 査読

Cuong Le Dinh, Takeshi Fujiwara, Song Toan Pham Phu

Chemical Engineering Transactions 89 499 - 504 2021年

担当区分：最終著者掲載種別：研究論文（学術雑誌）

Hoi An city is a dynamic tourism city in Vietnam which had received the certificate of World Heritage Site by UNESCO. The boom in tourism activities led to problems for the solid waste management system. Solid waste collection activities account for the largest proportion of expenses on solid waste management. Optimization of the present solid waste collection system of Hoi An city is an urgent mission. This research is an effort to describe the current solid waste collection system of Hoi An city with the support of GIS and GPS. The results denoted Thursday, Friday, and Saturday accounted for the most enormous workload with 36, 34, and 40 trips. The total working time for these days were 103.86, 96.12, and 109.6 h while the total traveled distances were 733.76, 719.21, and 848.12 km. The complexity of solid waste collection routes, frequencies of solid waste collection, and coverage of solid waste collection activities decreased from urban areas to rural areas. Collection of waste accounted for the largest amount of time in solid waste collection activities. The low rate of waste separation at source, illegal solid waste collection, extreme weather, misbehaviours of drivers and workers, as well as the limitation in waste treatment facilities were the problems and challenges of the solid waste collection system in Hoi An city.

DOI： 10.3303/CET2189084

Performance of Oyster Shell Powder Size on Methane Gas Generation in Two-Stage Anaerobic Digestion System 査読

Peni Astrini Notodarmojo, Takeshi Fujiwara, Habuer, Mochammad Chaerul

Chemical Engineering Transactions 89 373 - 378 2021年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

An anaerobic digester system is a sequence of process to digest biodegradable waste into biogas in the absence of oxygen. In two-stage anaerobic digestion system acid-forming steps or hydrolysis stage are separated from the methane forming steps. Although hydrolysis stage tends to get too acidic, addition of alkali substance can prevent pH from dropping too low so as to maintain good decomposition condition for microorganism. Oyster shell powder is a useful pH control additive containing CaCO3 at high percentage that can neutralize acid. In this study, the performances between industry-made fine oyster shell (IOS) powder (size 10.5 μm) and manually ground oyster shell (OS) powder (size < 1 mm) in methane generation yield were compared. NaOH, which is an alkali reagent for controlling pH, also used in comparison. The result showed that at the end of the hydrolysis stage, IOS powder increased pH up to 6.63, NaOH did almost the same (6.72), and OS powder was the lowest (6.1). In liquid residue, ratio of inorganic ash content with IOS treatment was the highest (2.1 %), but OS was the lowest (1.4 %). In the methanogenesis stage, CH4 concentration with NaOH treatment was the highest (80 %) compared to oyster shell powders: 74.33 % in IOS and 74.24 % in OS. Average methane yield over observation period of IOS treatment was the highest (533.9 mL/gVS), followed by alkali (487.3 mL/gVS) and OS (413.7 mL/gVS). Total CH4 from IOS treatment was 37 % and 8 % higher than OS and alkali treatment. Powder size of oyster shell greatly affected pH control, methane yield, and solid-liquid separation, but not methane concentration. Using IOS powder as pH control in hydrolysis of two-stage anaerobic system resulted in 78 % less cost than using NaOH.

DOI： 10.3303/CET2189063

Environmental Impact of Anthropogenic Mercury Release in China 査読

Habuer, Takeshi Fujiwara, Masaki Takaoka

Chemical Engineering Transactions 89 301 - 306 2021年

担当区分：最終著者記述言語：英語掲載種別：研究論文（学術雑誌）

There is increasing public concern regarding the potential risks posed by mercury and mercury compounds. Knowledge of the mercury emission and release inventory, and determination of the main factors that ameliorate the environmental impact of anthropogenic activities, will contribute to environmentally sound mercury management. This study used a life cycle impact assessment to identify the major factors contributing to the overall environmental burden imposed by elemental mercury releases. The environmental impact of the business-as-usual scenario (total impacts = 5.13 GPt) was greater than that of the accelerated technology transformation (ACR) scenario (total impacts = 4.51 GPt), especially in terms of the impact on human health (HH). ACR mainly reduces mercury emissions to air, which affects HH. Compared to its effects on HH, mercury release to the environment has less impact on ecosystem diversity (ED). Mercury release to land had the largest impact on ED, followed by mercury emissions to air and discharge to water. ACR can reduce the harm to HH and marine ecosystems by 12 %. This study provides quantitative information on the environmental impact of mercury release, facilitating strategic management of mercury emissions in line with the Minamata Convention on Mercury (implemented in China in 2017).

DOI： 10.3303/CET2189051

Comparison Between Single and Two-Stage Anaerobic Digestion of Vegetable Waste: Kinetics of Methanogenesis and Carbon Flow 査読

Dinh Pham Van, Fujiwara Takeshi, Giang Hoang Minh, Song Toan Pham Phu

Waste and Biomass Valorization 11 ( 11 ) 6095 - 6103 2020年11月

Enhancing waste management practice - The appropriate strategy for improving solid waste management system in Vietnam towards sustainability 査読

Song Toan Pham Phu, Takeshi Fujiwara, Giang Minh Hoang, Dinh Van Pham, Hoa Kieu Thi, Yen Anh Tran Thi, Cuong Dinh Le

Chemical Engineering Transactions 78 319 - 324 2020年2月

A review of anaerobic digestion systems for biodegradable waste: Configurations, operating parameters, and current trends 査読

Dinh Pham Van, Takeshi Fujiwara, Bach Leu Tho, Pham Phu Song Toan, Giang Hoang Minh

Environmental Engineering Research 25 ( 1 ) 1 - 17 2020年2月

Waste-to-landfill reduction: Assessment of cost-effective solutions using an optimisation model 査読

Giang Minh Hoang, Song Toan Pham Phu, Takeshi Fujiwara, Dinh Van Pham

Chemical Engineering Transactions 78 511 - 516 2020年

Solid waste management practice in a tourism destination – The status and challenges: A case study in Hoi An City, Vietnam 査読

Song Toan Pham Phu, Takeshi Fujiwara, Giang Hoang Minh, Dinh Pham Van

Waste Management and Research 37 ( 11 ) 1077 - 1088 2019年11月

担当区分：最終著者掲載種別：研究論文（学術雑誌）

This study aims to present waste characterisation, solid waste management practice and analyse the challenges in the solid waste management system in the tourism destination of Hoi An City, Vietnam. The sampling and questionnaire surveys were conducted for measuring characterisation and management practice of solid waste. A material flow analysis method was used for analysing the waste flow. The results show that the tourism destination generated daily around 15080 kg t of waste, in which the significant proportions come from restaurants (46%), hotels (22%) and households (13%). The feature of the waste composition is high rates of kitchen waste (46.8%), tissue (11.54%) and recyclable materials (12.58%), which result in high moisture (46.79%) and a low heating value (16,866 kJ kg-1) of waste. Also, solid waste management practices were evasively implemented by stakeholders with low rates and efficiency. Furthermore, a substantial gap of the solid waste management system is the confusion in waste collection activities, which is shown by the overload of waste in street bins and the financial loss for the solid waste management system owing to the non-compliance with collection regulation of stakeholders. Also, the mixing of waste by collection crews after separation at sources, the in-appropriation of collection time and manner are the dark points of the solid waste management system that may be causes of the non-cooperation of stakeholders. These gaps and confusion in the solid waste management system are the significant challenges in the improvement of the solid waste management system in the tourism destination toward sustainability.

DOI： 10.1177/0734242X19862042

Sustainable solid waste management system using multi-objective decision-making model: a method for maximizing social acceptance in Hoi An city, Vietnam 査読

Giang Minh Hoang, Takeshi Fujiwara, Toan Song Pham Phu, Luong Duc Nguyen

Environmental Science and Pollution Research 26 ( 33 ) 34137 - 34147 2019年11月

The fate of carbon in two-stage anaerobic digestion of vegetable waste 査読

P. V. Dinh, T. Fujiwara, H. M. Giang, S. T. Pham Phu

IOP Conference Series: Earth and Environmental Science 307 ( 1 ) 2019年8月

Assessment of public-private partnership in municipal solid waste management in Phnom Penh, Cambodia 査読

Vin Spoann, Takeshi Fujiwara, Bandith Seng, Chanthy Lay, Mongtoeun Yim

Sustainability 11 ( 5 ) 1228 2019年3月

Waste separation at source and recycling potential of the hotel industry in Hoi An city, Vietnam 査読

Song Toan Pham Phu, Takeshi Fujiwara, Minh Giang Hoang, Van Dinh Pham, Minh Thao Tran

Journal of Material Cycles and Waste Management 21 ( 1 ) 23 - 34 2019年1月

An analysis of the commercial waste characterisation in a tourism city in Vietnam 査読

Song Toan Pham Phu, Fujiwara Takeshi, Hoang Minh Giang, Pham Van Dinh

International Journal of Environment and Waste Management 23 ( 3 ) 319 - 335 2019年

Analyzing solid waste management practices for the hotel industry 査読

S. T. Pham Phu, M. G. Hoang, T. Fujiwara

Global Journal of Environmental Science and Management 4 ( 1 ) 19 - 30 2018年12月

Kinetics of carbon dioxide, methane and hydrolysis in co-digestion of food and vegetable wastes 査読

D. Pham Van, G. M. Hoang, S. T. Pham Phu, T. Fujiwara

Global Journal of Environmental Science and Management 4 ( 4 ) 401 - 412 2018年9月

Kinetic of Biogas Production in Co-Digestion of Vegetable Waste, Horse Dung, and Sludge by Batch Reactors 査読

P. V. Dinh, T. Fujiwara, S. T.Pham Phu, M. G. Hoang

IOP Conference Series: Earth and Environmental Science 159 ( 1 ) 2018年6月

Enabling low-carbon emissions for sustainable development in Asia and beyond 査読

Chew Tin Lee, Jeng Shiun Lim, Yee Van Fan, Xia Liu, Takeshi Fujiwara, Jiří Jaromír Klemeš

Journal of Cleaner Production 176 726 - 735 2018年3月

Over 90% of economies in Asia have submitted the mitigation objectives in the Intended Nationally Determined Contribution (INDC) for reducing GHG emissions targets and communicating other relevant climate policy actions. It is crucial to continuously monitor the achievement of this GHG mitigation targets using monitoring tools and evidenced by scientific methods. This Special Volume (SV) is devoted to presenting feasible cleaner technologies supported by environmental assessment tool to enable the transition of Asia into a low-carbon-emission economy. A half of the Asia emissions reduction through 2050 is contributed by low-carbon-emission energy production and another third from energy efficiency measures, with the rest achieved by curtailing emissions from forest deforestation, land degradation, and other non-energy sources. The concept of enabling low carbon emissions is not just reducing the CO2 equivalent (eq.), it concerns on other negative impacts of the emission on the whole ecosystem such as particle matter and other emissions (NOx, O3, and SOx) that are threatening the air quality and premature. Carbon emissions from the major sectors of energy, transportation, and industrial waste with the focus of presenting feasible cleaner practices or technologies to enable the implementation of sustainable development in Asia are presented. Life cycle and environmental management study on the assessment methods for environmental impact prevention, control or minimisation. Waste to wealth presented the cleaner technologies developed to convert waste resources into valuable products to promote a green economy. Process system engineering and LCA tools are widely applied in the energy sector; they could be applied to other sectors as well as to evaluate the sustainability performance index. On-going efforts are essential to close the gaps among technology providers, government sectors and investor to enable a low-carbon emissions transition in Asia.

DOI： 10.1016/j.jclepro.2017.12.110

Characterization and Modeling of Household Waste Generation Based on a Questionnaire Study - Case Study of Iskandar Malaysia 査読

Life cycle assessment and life cycle costing toward eco-efficiency concrete waste management in Malaysia 査読

Chooi Mei Mah, Takeshi Fujiwara, Chin Siong Ho

Journal of Cleaner Production 172 3415 - 3427 2018年1月

Suitability assessment for handling methods of municipal solid waste 査読

B. Seng, T. Fujiwara, B. Seng

Global Journal of Environmental Science and Management 4 ( 2 ) 113 - 126 2018年

Challenges and lessons learnt from a community-based food waste composting project in Johor 査読

Nur Farzana Ahmad Sanadi, Norfhairna Baharulrazi, Nur Naha Abu Mansor, Takeshi Fujiwara, Chew Tin Lee

Chemical Engineering Transactions 63 355 - 360 2018年

A new kinetic model for biogas production from co-digestion by batch mode 査読

D. Pham Van, G. Hoang Minh, S. T. Pham Phu, T. Fujiwara

Global Journal of Environmental Science and Management 4 ( 3 ) 251 - 262 2018年

Households' knowledge, attitudes, and practices toward solid waste management in suburbs of Phnom Penh, Cambodia 査読

Bandith Seng, Takeshi Fujiwara, Vin Spoann

Waste Management and Research 36 ( 10 ) 993 - 1000 2018年

Municipal solid waste management: Constraints and opportunities to improve capacity of local government authorities of Phnom Penh Capital. 査読

Vin Spoann, Takeshi Fujiwara, Bandith Seng

Waste Management and Research 36 ( 10 ) 985 - 992 2018年

Waste Recycling System for a Tourism City in Vietnam: Situation and Sustainable Strategy Approach - Case Study in Hoi An City, Vietnam 査読

S T Pham Phu, T Fujiwara, P V Dinh, Hoa K T

IOP Conference Series: Earth and Environmental Science 159 ( 159 ) 1 - 8 2018年

Environmental impacts of construction and demolition waste management alternatives 査読

Chooi Mei Mah, Takeshi Fujiwara, Chin Siong Ho

Chemical Engineering Transactions 63 343 - 348 2018年

Methodological aspects of modeling household solid waste generation in Japan: Evidence from Okayama and Otsu cities 査読

Binxian Gu, Takeshi Fujiwara, Renfu Jia, Ruiyang Duan, Aijun Gu

Waste Management and Research 35 ( 12 ) 1237 - 1246 2017年12月

Towards low carbon society in Iskandar Malaysia: Implementation and feasibility of community organic waste composting 査読

Cassendra Phun-Chien Bong, Rebecca Kar Yee Goh, Jeng-Shiun Lim, Wai Shin Ho, Chew-Tin Lee, Haslenda Hashim, Nur Naha Abu Mansor, Chin Siong Ho, Abdul Rahim Ramli, Fujiwara Takeshi

JOURNAL OF ENVIRONMENTAL MANAGEMENT 203 ( 2 ) 679 - 687 2017年12月

Life cycle assessment of biodiesel fuel production from waste cooking oil in Okayama City 査読

Jinmei Yang, Takeshi Fujiwara, Qijin Geng

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 19 ( 4 ) 1457 - 1467 2017年10月

Predicting waste generation using Bayesian model averaging 査読

M. G. Hoang, T. Fujiwara, S. T. Pham Phu, K. T, Nguyen Thi

Global Journal of Environmental Science and Management 3 ( 4 ) 385 - 402 2017年9月

MUNICIPAL WASTE GENERATION AND COMPOSITION IN A TOURIST CITY — HOI AN, VIETNAM 査読

Minh Giang HOANG, Takeshi FUJIWARA, Song Toan, PHAM PHU

Journal of JSCE 5 ( 1 ) 123 - 132 2017年

ガス化改質技術によるガス生産を核とした廃棄物処理・エネルギー回収システムに関する研究査読

鈴木和将, 藤原健史, 川本克也

全国環境研究誌 42 ( 3 ) 52 - 60 2017年

Concrete waste management decision analysis based on life cycle assessment 査読

Chooi Mei Mah, Takeshi Fujiwara, Chin Siong Ho

Chemical Engineering Transactions 56 25 - 30 2017年

Waste Separation at Source Practice and Recycling Potential of The Hotel Industry in Hoi An Ancient City, Vietnam

Song Toan Pham Phu, Takeshi Fujiwara, Giang Hang Minh

4th International Conference on Final Sink 101 - 102 2017年

Commercial Solid Waste Generation and Composition Practice in A Tourism City - Hoi An, Vietnam 査読

S. T. Pham Phu, M. G. Hoang, T. Fujiwara

Global Waste Management 2017 (7th International Conference on Solid Waste Management, 2017) 867 - 875 2017年

Construction and demolition waste generation rates for high-rise buildings in Malaysia 査読

Chooi Mei Mah, Takeshi Fujiwara, Chin Siong Ho

WASTE MANAGEMENT & RESEARCH 34 ( 12 ) 1224 - 1230 2016年12月

A systematic approach to projecting industrial solid waste generation by industrial sector in Shanghai 査読

Jinmei Yang, Takeshi Fujiwara, Yuzuru Matsuoka, Wei Wang

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 18 ( 1 ) 81 - 92 2016年1月

Feasibility Study on Effectiveness of Solid Waste Incineration in Hoi An, Vietnam

9th International Conference on: Combustion, Incineration/Pyrolysis, Emission and Climate change (i-CIPEC) 1 - 4 2016年

A Life cycle assessment framework for evaluatin of construction and demolition waste management practices

Chooi Mei Mah, Takeshi Fujiwara, Chin Siong Ho

Asian-Pacific Landfill Symposium - Integrated Waste Management and Sustainable Landfilling (APLAS 2016) 1 - 7 2016年

Municipal Solid Waste Characterization and Waste Management Issues in a Tourist City - Hoi An, Vietnam

Hoang Minh Giang, Fujiwara Takeshi, Pham Phu Song Toan

Asian-Pacific Landfill Symposium - Integrated Waste Management and Sustainable Landfilling (APLAS 2016) 1 - 10 2016年

Management of landfill reclamation with regard to biodiversity preservation, global warming mitigation and landfill mining: experiences from the Asia-Pacific region

Yu-Chi Weng, Takeshi Fujiwara, Harvey J. Houng, Chia-Hui Sun, Wen-Ying Li, Ya-Wen Kuo

JOURNAL OF CLEANER PRODUCTION 104 364 - 373 2015年10月

Municipal solid waste characterization and recycling potentials in Phnom Penh city, Cambodia

Bandith Seng, Takeshi Fujiwara

The 2nd 3R International Scientific Conference on Material Cycle and Waste Management 1 - 4 2015年

A Survey of Construction and Demolition Waste in Malaysia Mixed-Use Development

Chooi Mei Mah, Takeshi Fujiwara, Chin Shing Ho

ISWA Beacon 3rd International Conference on Final Sinks 54 - 55 2015年

Recycling of plastic packaging waste in Bandung City, Indonesia 査読

Mochammad Chaerul, Ahmad Reza Fahruroji, Takeshi Fujiwara

JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT 16 ( 3 ) 509 - 518 2014年7月

A Study of Commercial Solid Waste Generation and Composition in Phnom Penh City, CAMBODIA 査読

YIM Mongtoeun, Takeshi FUJIWARA, SOUR Sethy

Journal of Natural Science Research 4 ( 13 ) 49 - 54 2014年

A study on system optimization of solid waste management in Johor Bahru, Malaysia

Takeshi Fujiwara, Yasuhito Yoneda

The 8th Asian-Pacific Landfill Symposium (APLAS) in Hanoi 1 - 7 2014年

Transforming Municipal Waste into a Valuable Soil Conditioner through Knowledge-Based Resource-Recovery Management 査読

Golabi MH, Kirk Johnson, Takeshi Fujiwara, Eri Ito

International Journal of Waste Resources 87 - 100 2014年

Prospect of Household Solid Waste Management Improvement based on Low Carbon Society Survey in Iskandar Malaysia

Takeshi Fujiwara, Siti Norbaizura, Md. Rejab, ho Chin Siong, Zainura Zainon Noor

The 3R International Scientific Conference on Material Cycles and Waste Management (3RINCS) and 13th Expert Meeting on Solid Waste Management in Asia and Pacific Island (SWAPI) 1 - 4 2014年

Solid Waste Management strategy Towards A Sound Material Cycle Society in A Low-Carbon Society - Iskandar Malaysia

Takeshi Fujiwara, Sti Norbaizura

International Conference on Waste Management and Environment (ICWME 2013) 1 - 4 2013年

Study on waste reduction possibility through alternative Scenarios of treatment facilities in Hanoi base on Life Cycle Assessment

Luong Tie, Mai Huong, Takeshi Fujiwara, Nguyen Thi Kim Thai

International Conference on Waste Management and Environment (ICWME 2013) 1 - 4 2013年

Siti Norbaizura M.R, Takeshi Fujiwara, Ho Chin Siong

環境衛生工学研究 27 ( 2 ) 9 - 19 2013年

地図情報を用いた災害廃棄物の発生量予測と収集輸送計画査読

藤原健史, 中村彰太

EICA 17 ( 4 ) 2013年

Sustainable Waste Management for Low-carbon Society Iskandar Malaysia 2025 査読

Takeshi Fujiwara, Sit Nor Baizura

8th International Symposium on Digital Earth 1 - 7 2013年

AN ASSESSMENT ON HOUSEHOLD ATTITUDES AND BEHAVIOR TOWARDS HOUSEHOLD SOLID WASTE DISCARD AND RECYCLING IN THE MEKONG DELTA REGION - SOUTHERN VIETNAM 査読

Nguyen Phuc Thanh, Yasuhiro Matsui, Takeshi Fujiwara

ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL 11 ( 8 ) 1445 - 1454 2012年8月

観光を主産業とする島国の廃棄物排出量将来推計に関する研究 -グアムを例として-

藤原健史, 伊藤依理

廃棄物資源循環学会研究発表会講演集 23 81 - 81 2012年

出版者・発行元：一般社団法人廃棄物資源循環学会

アメリカ準州のグアム島は、人口約16万人に対して年間約110万人の観光客が訪れており、その8割以上が日本の観光客である。旅行客が島に滞在すればその人が使用した物品が廃棄物となり，それらの物品やサービスを提供する過程でも廃棄物が発生する。また一方で，グアム住民にはスーパーマーケットやレストランで買い物や食事をするアメリカ本土の消費スタイルが定着し，ごみ発生量が多くなってきている。グアム島は資源や生産業を持たず海外から物資を多く輸入している。本研究では、グアムのごみ発生量が家計、政府、そして観光客の消費活動に由来し，消費を支えるグアム経済が観光客の支出に支えられていると仮定して，グアムの産業連関表の作成，将来人口の予測，観光業の発展シナリオの作成を行い，将来(2020年)までの家計消費からごみ排出量を推計した。

DOI： 10.14912/jsmcwm.23.0_81

J-GLOBAL

水害廃棄物の仮置場選定支援システムの試作

藤原健史, 中村彰太

廃棄物資源循環学会研究発表会講演集 23 193 - 193 2012年

出版者・発行元：一般社団法人廃棄物資源循環学会

2011年3月11日に発生した東日本大震災により、岩手・宮城・福島の3県で約2,200万トンもの災害廃棄物が発生したと推計されている。大量の災害廃棄物を貯留・選別するためには、その量に応じて多くの仮置場の設置が必要となる。災害廃棄物の量をできるだけ早く推計することは、復旧・復興計画の策定に役立つ。本研究では被災地の建物の地図情報を得ることにより、災害廃棄物の量を推計した。そして，被災地から仮置場までの距離とがれきの推計発生量を考慮することで、仮置場の候補地を評価するシステムを試作した。

DOI： 10.14912/jsmcwm.23.0_193

J-GLOBAL

Evaluation of Waste Treatment Strategies in Chinese cities from View points of GHG Emission 査読

視体積交差法を用いたがれき堆積廃棄物の計測手法の開発査読

藤原健史

EICA 17 ( 2/3 ) 2012年

産業連関表を用いたグアムにおける家庭ごみ排出量の将来推計-人口増加及び観光業の影響分析- 査読

藤原健史, 伊藤依理

地球環境研究論文集 20 2012年

Examining the effectiveness of municipal solid waste management systems: An integrated cost-benefit analysis perspective with a financial cost modeling in Taiwan 査読

Yu-Chi Weng, Takeshi Fujiwara

WASTE MANAGEMENT 31 ( 6 ) 1393 - 1406 2011年6月

Assessment of plastic waste generation and its potential recycling of household solid waste in Can Tho City, Vietnam 査読

Nguyen Phuc Thanh, Yasuhiro Matsui, Takeshi Fujiwara

ENVIRONMENTAL MONITORING AND ASSESSMENT 175 ( 1-4 ) 23 - 35 2011年4月

Jinmei YANG, Takeshi FUJIWARA, Yuzuru MATSUOKA, Wei WANG

Journal of Environmental Science for Sustainable Society 5 27 - 36 2011年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Graduate School of Environmental and Life Science, Okayama University

Recent years have witnessed increased attention being given to the evaluation and selection of alternative waste treatment strategies from the view of reduction of greenhouse gas (GHG) emissions. However, a long period of waste records is necessary for getting acceptably accurate results, especially in calculating GHG emission from disposal site. Therefore, in this paper, applying the systematic approach we have developed in the previous work, the back-casting and ex-post forecasting of the waste quantity by composition in the past is conducted. Then, current GHG emissions in five Chinese metropolitan cities are investigated and analyzed; thereafter, a scenario analysis is carried out in Shanghai based on the forecasts of waste generation and the corresponding waste category in 2015. Methane (CH₄), carbon dioxide (CO₂) and nitrous oxide (N₂O) are mainly taken into account in GHG emission due to significant amount emitted from waste treatment. The results confirm that the per capita CO₂ emission factor (kg CO₂-eq/kg waste-treated) in Shanghai, Guangzhou, Hangzhou, Wuhan and Chengdu in 2007 is 0.48, 0.59, 0.57, 0.41 and 0.48 respectively, thereby demonstrating that economic growth is the main driving force of GHG emissions currently observed in Chinese cities. Further, through the scenario analysis, composting and integrated waste management are considered as effective attempts at reducing GHG emissions in Shanghai.

DOI： 10.3107/jesss.5.27

ステレオ計測システムを用いたごみ供給管理システムの実施設への適用に関する研究

Household solid waste generation and characteristic in a Mekong Delta city, Vietnam 査読

Nguyen Phuc Thanh, Yasuhiro Matsui, Takeshi Fujiwara

JOURNAL OF ENVIRONMENTAL MANAGEMENT 91 ( 11 ) 2307 - 2321 2010年11月

高岡昌輝, 伊藤大輔, 中塚大輔, 角田芳忠, 武田信生, 藤原健史, 大下和徹

EICA 15 ( 2 ) 221 - 224 2010年10月

An analysis of municipal solid waste discards in Taiwan based on consumption expenditure and policy interventions 査読

Yu-Chi Weng, Takeshi Fujiwara, Yuzuru Matsuoka

WASTE MANAGEMENT & RESEARCH 28 ( 3 ) 245 - 255 2010年3月

Application of a MSW generation estimation model: A comparison of generation property among metropolitan cities in China 査読

Jinmei Yang, Takeshi Fujiwara, Yuzuru Matsuoka, Wei Wang

Journal of Global Environment Engineering 15 1 - 14 2010年2月

ごみ焼却ピット投入ごみの画像処理に関する研究査読

藤原健史, 吉川佳織, 劉大偉, 辻本進一, 松田吉司

EICA 14 ( 2 ) 110 - 114 2009年10月

粒径別に分画した飛灰におけるポリ塩化ビフェニルおよびクロロベンゼン類の de novo 合成挙動の温度依存性査読

高岡昌輝, 谷垣信宏, 武田信生, 藤原健史

廃棄物学会論文誌 = Journal of the Japan Society Waste Management Experts 17 ( 1 ) 11 - 22 2006年1月

都市ごみ焼却炉のごみ供給推定モデルの開発とその適用査読

伊藤大輔, 高岡昌輝, 中塚大輔, 角田芳忠, 武田信生, 藤原健史, 大下和徹

廃棄物学会論文誌 = Journal of the Japan Society Waste Management Experts 16 ( 3 ) 189 - 197 2005年5月

ステレオ画像処理を用いたごみ焼却炉ホッパ内のごみ体積の計測査読

伊藤大輔, 高岡昌輝, 中塚大輔, 角田芳忠, 武田信生, 藤原健史, 大下和徹

廃棄物学会論文誌 16 ( 5 ) 2005年

廃棄物報告排出量と産業統計量に基づくアジア諸国の廃棄物発生量に関する研究査読

佐々木努, 松岡譲, 藤原健史

環境システム研究論文集 33 2005年

粒径別に分画した飛灰におけるポリ塩化ビフェニルおよびクロロベンゼン類の再合成挙動査読

高岡昌輝, 谷垣信宏, 武田信生, 藤原健史

廃棄物学会論文誌 = Journal of the Japan Society Waste Management Experts 15 ( 5 ) 336 - 346 2004年9月

記述言語：日本語出版者・発行元：一般社団法人廃棄物資源循環学会

一つの飛灰を粒径により分画することで, 組成に特徴のある飛灰が得られることに注目し, 飛灰中のポリ塩化ビフェニル (PCBs) , クロロベンゼン類 (CBzs) の濃集粒径に関する情報と飛灰加熱時のPCBs, CBzsの挙動とを結びつけ, 飛灰におけるPCBs, CBzsの再合成への支配的因子の影響を明らかにすること, および飛灰粒径ごとのPCBs, CBzsの濃度分布の生成原因を解明することを目指して, 飛灰粒径, 温度および雰囲気を変えて加熱実験を行った。その結果, 金属触媒や未燃炭素のPCBsおよびCBzs生成への寄与率は温度によって一定ではなく, 反応温度によってその寄与率が変化することが示唆された。また, 同族体分布は飛灰粒径によっては変わらず, PCBsおよびCBzsの生成機構に飛灰粒径による違いは見られなかった。雰囲気による生成能に関しても飛灰粒径による違いが見られず, HClの有無がPCBsおよびCBzs生成に与える影響は小さかった。

DOI： 10.3985/jswme.15.336

産業連関表などの経済・生産統計を用いたマテリアルフローとストックに関する解析手法の開発査読

中村太陽, 松岡譲, 藤原健史

環境システム研究論文集 32 2004年

The behavior of PCDD/Fs, PCBs, chlorobenzenes and chlorophenols in wet scrubbing system of municipal solid waste incinerator 査読

Masaki Takaoka, Peiyu Liao, Nobuo Takeda, Takeshi Fujiwara, Kazuyuki Oshita

Chemosphere 53 ( 2 ) 153 - 161 2003年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Though some researchers have already reported polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) concentration in flue gas at inlet and outlet of wet scrubber (WS) in municipal solid waste incinerator (MSWI), there are few investigations about scrubbing water, suspended solid (SS) in scrubbing water and sludge. In order to understand the behavior of PCDD/Fs in WS and to make clear the effect of the residence time of scrubbing water in WS on the PCDD/Fs concentrations in scrubbing water and at the outlet gas of WS, PCDD/Fs, polychlorinated biphenyls (PCBs), chlorobenzenes (CBzs) and chlorophenols (CPs) concentrations in various media around WS were investigated at two MSWIs. PCDD/Fs concentration in flue gas at outlet of WS was higher than that at inlet of WS in both MSWIs. In WS A, it was observed that the homologue profiles changed considerably and the concentration of higher chlorinated compounds such as H7CDD/Fs and O8CDD/F increased remarkably at outlet gas of WS A. Only CPs were transferred from flue gas to scrubbing water in both WSs. As for scrubbing water, a large amount of their chlorinated aromatic compounds was detected in SS particles. According to the results, it was found that not only flue gas conditions but also operational and structural conditions in WS had great influence on minimizing the memory of chlorinated aromatic compounds in WS. © 2003 Elsevier Ltd. All rights reserved.

DOI： 10.1016/S0045-6535(03)00437-5

ストーカ式ごみ焼却炉におけるごみ供給量安定化システムの開発研究 : ごみの低位発熱量推定、圧密特性に係る基礎研究査読

角田芳忠, 中塚大輔, 伊藤大輔, 武田信生, 藤原健史, 高岡昌輝

廃棄物学会論文誌 14 ( 4 ) 210 - 218 2003年7月

記述言語：日本語出版者・発行元：一般社団法人廃棄物資源循環学会

ストーカ式ごみ焼却炉におけるごみ供給量安定化システムの確立に向けた研究の一環として, ごみの見かけ密度と低位発熱量との関連を明らかにし, 模擬ごみを用いた実験によりごみの圧密特性を検討した。人口や地域差の影響はあるものの, ごみの見かけ密度と低位発熱量の間には強い負の相関関係が認められ, 見かけ密度の測定により低位発熱量の推定が可能となった。ごみ供給部でのごみの見かけ体積変化が大きく, ごみ供給量の推定にはごみの圧密を考慮することが不可欠である。実験により求めた圧密特性曲線は, 二次近似式で表される部分と一次近似式で表される部分からなり, ごみ組成により異なるものの基本的には同様の特性関数で表すことができる。

DOI： 10.3985/jswme.14.210

灰分組成と示差熱分析による焼却灰・飛灰の融点の推定査読

高岡昌輝, 藤田淳, 藤原健史, 武田信生

土木学会論文集 = Proceedings of JSCE 727 ( 727 ) 91 - 101 2003年2月

示差熱分析データからみた焼却灰・飛灰の溶融パターンの分類査読

高岡昌輝, 藤原健史, 藤田淳, 武田信生

土木学会論文集 = Proceedings of JSCE 727 ( 727 ) 77 - 89 2003年2月

環境負荷と費用からみた廃棄物処理広域化の規模に関する研究査読

佐々木努, 藤原健史, 松岡譲

環境システム研究論文集 31 2003年

Control of mercury emissions from a municipal solid waste incinerator in japan 査読

Masaki Takaoka, Nobuo Takeda, Fujiwara Takeshi, Masato Kurata, Kimura Tetsuo

Journal of the Air and Waste Management Association 52 ( 8 ) 931 - 940 2002年8月

既存社会資本の有効活用による灰溶融飛灰中重金属の再資源化試算査読

藤原健史, 武田信生, 中原啓介, 明石哲夫, 敦井実, 長崎英範

エネルギー・資源 23 ( 1 ) 55 - 60 2002年1月

消費財のフローとストックを考慮した家庭ごみ発生のモデリング査読

金森有子, 藤原健史, 松岡譲

環境システム研究論文集 30 2002年

プラスチック廃棄物のバッチ燃焼で発生する排ガス成分に関する研究査読

岩田憲和, 藤原健史, 武田信生, 高岡昌輝, 江口正司

環境工学研究論文集 39 2002年

家庭の消費財選好とごみ発生のモデルの開発査読

藤原健史, 上野智史, 松岡譲

環境システム研究論文集 30 2002年

ステレオ画像を用いたホッパ内ごみの表面形状の計測に関する研究査読

伊藤大輔, 藤原健史, 武田信生, 高岡昌輝, 角田芳忠, 中塚大輔

EICA 6 ( 1 ) 37 - 43 2001年9月

硫化ナトリウム添加による飛灰上の塩素化芳香族化合物の生成抑制に関する実験的研究査読

高岡昌輝, 中森研一, 武田信生, 藤原健史

土木学会論文集 685 ( 685 ) 91 - 102 2001年8月

記述言語：日本語出版者・発行元：公益社団法人土木学会

都市ごみ焼却炉内における塩素化芳香族化合物の化学的生成抑制を目的とし, 飛灰に硫化ナトリウムを添加することで, 加熱時に生成されるポリ塩化ビフェニルおよびクロロベンゼン類量の削減を実験により試みた. 硫化ナトリウムを飛灰に対し5%混合し, 塩化水素を500ppm混合した空気雰囲気で300℃に加熱した時, 硫化ナトリウム無添加時に比ベクロロベンゼン類は49%に, ポリ塩化ビフェニル類は22%に生成が抑制された. 加熱前と加熱後の飛灰中の銅の化学形態を調べると, 銅は硫化物になっていることが推定され, 硫化ナトリウムは重金属の不溶化に対しても効力があることが示された. これらの結果より, 硫化ナトリウによる生成抑制機構は主に銅触媒の失活であると推定された.

DOI： 10.2208/jscej.2001.685_91

高岡昌輝, 廣田淳一, 武田信生, 藤原健史

土木学会論文集 685 ( 685 ) 17 - 26 2001年8月

逐次抽出法による飛灰中亜鉛, 鉛, 銅およびカドミウムの化学形態推定査読

高岡昌輝, 蔵本康宏, 武田信生, 藤原健史

土木学会論文集 685 ( 685 ) 79 - 90 2001年8月

X線光電子分光分析による水銀連続分析装置内スズ表面での反応機構の解明査読

高岡昌輝, 島岡豊, 武田信生, 藤原健史

分析化学 50 ( 7 ) 501 - 507 2001年7月

記述言語：日本語出版者・発行元：公益社団法人日本分析化学会

新しく考案された乾式還元プロセスを持った水銀連続分析計で生じている反応をより明確にするために, 乾式還元部分である金属スズの表面をX線光電子分光分析により特性化した. まず, 金属スズの表面を塩化させる方法について検討した. 金属スズに600ppmの塩化水素ガスを2時間通過させるより, 1mol/lの塩酸に2時間浸漬させるほうがより深くまで金属スズ表面を塩化させることができることが分かった. 次に, 塩酸によりプレコートした金属スズを, 塩化第二水銀ガス及び水蒸気を含んだ空気にさらした場合の変化を確認した. 表面に生成された塩化第一スズは空気あるいは水蒸気により, 時間の経過とともに表面の塩素の割合が減少し, 主に酸化スズに変化した. 表面は酸化第二スズが, 深部は酸化第一スズが支配的であることが分かった. 分析結果から推定される表面での反応は, 実際の実験における物質収支から推定される反応と合致するものであった.

DOI： 10.2116/bunsekikagaku.50.501

その他リンク： http://dl.ndl.go.jp/info:ndljp/pid/10895046

X線光電子分光分析による飛灰表面上の亜鉛, 鉛, 銅の化学形態の推定査読

高岡昌輝, 蔵本康宏, 武田信生, 藤原健史

廃棄物学会論文誌 12 ( 3 ) 102 - 111 2001年5月

記述言語：日本語出版者・発行元：一般社団法人廃棄物資源循環学会

20種の焼却飛灰および5種の溶融飛灰上の亜鉛, 鉛, 銅の化学形態を推定するため, X線光電子分光分析を行った。飛灰と試薬のZn2p_3/2, Pb4f_7/2, Cu2p_3/2束縛エネルギーの比較から, 亜鉛は飛灰最表面では2ZnCO₃・3Zn (OH) ₂で, 内部ではZnやZnOで存在すると推定された。鉛は飛灰最表面ではPbCO₃, PbCl₂で存在するものが多く, 内部では排ガス処理方式により存在形態がわかれた。銅は飛灰の種類や深さ方向であまり変化がなく, CuO, CuCl, Cu, Cu₂Oで存在することが推定された。溶融飛灰ではほとんどの試料で1価銅もしくは銅単体で存在することが推定された。いずれにおいてもCuCl₂の形態で存在するとはいえなかった。ESCAによる深さ方向の分析では, 亜鉛, 鉛に関しては焼却飛灰, 溶融飛灰ともに表面に濃縮している傾向が見られたが, 銅の表面濃縮は顕著でなかった。

DOI： 10.3985/jswme.12.102

Measures to prevent emissions of PCDDS/DFs and co-planar PCBs from crematories in Japan 査読

Nobuo Takeda, Masaki Takaoka, Takeshi Fujiwara, Hisayuki Takeyama, Shoji Eguchi

Chemosphere 43 ( 4-7 ) 763 - 771 2001年

塩化第二鉄を用いた前凝集沈殿汚泥からのリンおよび塩化第二鉄の回収システムに関する検討査読

高岡昌輝, 広田淳一, 武田信生, 藤原健史

環境工学研究論文集 38 2001年

乾式還元プロセスを用いた燃焼排ガス中の水銀連続分析装置に関する研究査読

高岡昌輝, 島岡豊, 星野宗弘, 武田信生, 藤原健史

大気環境学会誌 35 ( 6 ) 332 - 342 2000年11月

記述言語：日本語出版者・発行元：公益社団法人大気環境学会

本研究では,粒状の金属スズを充填した乾式還元層における塩化第二水銀ガスの乾式還元に関する実験を行い,乾式還元プロセスに及ぼす影響因子の同定および乾式還元部で生じている反応を明らかにすることを目的とした。塩化第二水銀ガスの金属スズによる乾式還元反応では,金属スズ表面の塩化されている割合が重要な因子であり,あらかじめ1N塩酸で金属スズ表面をプレコートすることが還元能の維持に効果的であった。塩化した粒状金属スズ表面において,次のような2種類の並行する還元反応によって塩化第二水銀は金属水銀に還元されることがわかった。SnCl_2(s)+HgCl_2(g)→SnCl_4(g)+Hg(g) SnCI_2(s)+HgCl_2(g)+2H_2O(g)→Sn0_2(s)+Hg(g)+4HCl(g)更に,粒状スズの表面に形成された塩化第一スズは,次のような酸化反応によって消費される。これらの反応は上記の塩化第二水銀反応に比べて支配的に進むため,これらの酸化反応が還元率低下の主たる原因であると推測された。SnCl_2(s)+H_2O(g)→SnO(s)+2HCI(g) SnCl_2(s)+H_2O(g)+1/20_2(g)→Sn0_2(s)+2HCl(g)

琵琶湖浚渫底泥と下水汚泥焼却灰との混合溶融に関する研究査読

高岡昌輝, 武田信生, 岡島重伸, 平岡正勝, 藤原健史

下水道協会誌. 論文集 37 ( 453 ) 98 - 115 2000年7月

PCDDs/DFs emissions from crematories in Japan 査読

Nobuo Takeda, Masaki Takaoka, Takeshi Fujiwara, Hisayuki Takeyama, Shoji Eguchi

Chemosphere 40 ( 6 ) 575 - 586 2000年3月

模擬飛灰を用いた金属水銀ガスの除去機構に関する実験的研究査読

高岡昌輝, 武田信生, 藤原健史

大気環境学会誌 35 ( 1 ) 51 - 62 2000年1月

記述言語：日本語出版者・発行元：公益社団法人大気環境学会

本研究では,模擬飛灰を用いて活性炭との複合作用を示す金属水銀除去に決定的な役割をもつ物質を同定するとともに,その物質の量的な影響および反応経路を含めた除去機構を解明することを目的に実験を行った。活性炭との複合作用は塩化カルシウム,塩化第一鉄,塩化亜鉛に見られた。温度160℃,水分20%,空気雰囲気下では,塩化カルシウムに活性炭を5%混合することで,金属水銀ガスの除去率は99%以上の高率を示した。金属水銀は主にオキシ塩化水銀として活性炭上に化学吸着されており,オキシクロリネーション反応が生じていることがわかった。活性炭と塩化カルシウムの混合物における金属水銀の除去機構は以下の経路を進行する化学吸着であると考えられた。金属水銀→酸化水銀→塩化第二水銀→オキシ塩化水銀活性炭,塩化カルシウムの量的な影響をみるために,活性炭,塩化カルシウムと二酸化ケイ素からなる模擬飛灰を用いて実験を行った。活性炭の混合割合を5%と固定した場合,塩化カルシウムは0.5%以上あれば,ほぼ100%の水銀除去率を示した。逆に,塩化カルシウムの混合割合を1%と固定した場合,活性炭は5〜7%程度で最も除去率が高かった。また,活性炭含有率が非常に小さければ,模擬飛灰の水銀除去能は温度の影響を受けやすくなった。これらの現象は,焼成飛灰と活性炭を用いた実験においても観察されることから,実飛灰においても活性炭と塩化カルシウムとの複合作用が主たる除去機構であると推測された。

ごみのバッチ燃焼時に発生する排ガス成分の測定査読

岩田憲和, 藤原健史, 高岡昌輝, 武田信生

環境工学研究論文集 37 ( Pt.2 ) 2000年

琵琶湖しゅんせつ底泥と下水汚泥焼却灰との混合溶融に関する研究査読

高岡昌輝, 平岡正勝, 武田信生, 藤原健史, 岡島重伸

下水道協会誌 37 ( 453 ) 2000年

ごみ焼却飛灰中元素の定量に関する蛍光X線分析法の適用性査読

高岡昌輝, 中塚大輔, 武田信生, 藤原健史

廃棄物学会論文誌 11 ( 6 ) 333 - 342 2000年

鉄化合物を用いたPCBsの分解に関する研究査読

飼沼正志, 高岡昌輝, 武田信生, 藤原健史

環境工学研究論文集 37 ( Pt.2 ) 477 - 485 2000年

マイクロウェーブ抽出法による飛灰からのクロロベンゼン類,PCBsの抽出査読

高岡昌輝, 高田純一, 武田信生, 藤原健史

廃棄物学会論文誌 10 ( 6 ) 331 - 340 1999年11月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：一般社団法人廃棄物資源循環学会

飛灰からクロロベンゼン類やPCBsなどの有機塩素化合物を抽出するために, マイクロウェーブ抽出法の適用を検討した。まず, 抽出条件の最適化実験を行い, 抽出温度120℃, 抽出時間50分で高い抽出効果が得られた。次に, 8種のごみ焼却飛灰に対して適用した。従来のソックスレー抽出と比べて約80%程度, 超臨界流体抽出とは同等, もしくはそれ以上の抽出量を得ることができた。再現性についても, ソックスレー抽出および超臨界流体抽出と同程度であった。また, 抽出量と飛灰中の未燃炭素量との関係から, クロロベンゼン類については未燃炭素含有量との間に高い線形の相関関係があることがわかった。未燃炭素量が増えるとソックスレー抽出に比べてマイクロウェーブ抽出は抽出率がやや減少する傾向にあったが, マイクロウェーブ抽出は抽出時間を短縮でき, 使用する溶媒量も少なくできることから飛灰中のクロロベンゼン類, PCBsの抽出に十分適用できると考えられた。

DOI： 10.3985/jswme.10.331

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