研究者詳細 - 藤原　健史

論文 - 藤原　健史

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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

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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

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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

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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

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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

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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

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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

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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

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