Faculty Profiles - FUJIWARA Takeshi

Papers - FUJIWARA Takeshi

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

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

環境衛生工学研究 27 ( 2 ) 9 - 19 2013

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

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

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

Nguyen Phuc Thanh, Yasuhiro Matsui, Takeshi Fujiwara

ENVIRONMENTAL ENGINEERING AND MANAGEMENT JOURNAL 11 ( 8 ) 1445 - 1454 2012.8

Language：English Publishing type：Research paper (scientific journal) Publisher：GH ASACHI TECHNICAL UNIV IASI

The aims of this study were to explore and assess the household behavior towards recyclable waste discard and household attitudes towards good waste management in the Mekong delta region - southern Vietnam. A questionnaire survey was carried out in 100 households in Can Tho city. The existing household habits for waste discard, storage, collection, and recycling activities were clarified in order to identify the priority problems of these activities. Regarding household behavior towards recycling activities and the purchase behavior of households for avoidable wastes (e.g., plastic carry bags, container and packaging, expired/residual food waste) were explored. The household behavior for reusing the used valuable things instead of discarding and for consuming the products or goods made from recycling materials was also examined. Besides, household attitudes towards good waste management were partly explored; the results found that the neighbor's view and social norms seemed to work for keeping order in waste collection and discard activities. Moreover, the authors also analyzed the interrelationships among the household behavior towards recycling activities, the household attitudes towards good waste management, and individual attributes such as the education level, urbanization level, income, age, gender, and working status. It was found that household attitudes towards good waste management correlated to household behavior towards recycling activities; education level and urbanization level were identified as relevant factors for enhancing waste recycling activities and good environmental attitudes of households.

DOI： 10.30638/eemj.2012.180

Web of Science

Scopus

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Future Projection of Solid Waste Discharge in Island Country with Tourism as Main Industry - Case Study on Guam -

Fujiwara Takeshi, ITO ERI

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management 23 81 - 81 2012

Publisher：Japan Society of Material Cycles and Waste Management

Guam island of US accepts about 1.1 million tourists every year comparing topopulation  160,000, and over 80% of tourists is Japanese.  While a tourist stays in the island, many goods used by the tourist become solid waste and also other waste is indirectly generated in the process of supplying the goods or services.  On the other hand, residents in Guam, mainly aboriginal Chamorro, have accepted modern consumption style that people buy commodities in a supermarket and eat in a restaurant, thus, the amount of waste discharge has increased.  Due to less resources and small number of industries except tourism, Guam island has to import many goods from oversea.  In this study, it is assumed that the amount of waste discharge depends on consumption behaviors of household, government and tourists, and economics of Guam is supported by tourist’s expense.  Based on the assumptions, future waste discharge from household until 2020 is projected through developing IO table, future prediction of population, and future scenario of population and tourism.

DOI： 10.14912/jsmcwm.23.0_81

CiNii Article

J-GLOBAL

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Development of Temporal Stock Yard Selection System for Flood Disaster Waste

Fujiwara Takeshi, Nakamura Syouta

Proceedings of the Annual Conference of Japan Society of Material Cycles and Waste Management 23 193 - 193 2012

Publisher：Japan Society of Material Cycles and Waste Management

The amount of disaster waste caused by the Great East Japan Earthquake in March 11th, 2011 was estimated at 22 million tons in Iwate, Miyagi and Fukushima prefectures. For the sake of keeping and sorting a massive disaster waste, it needs many temporal storage yards according to the amount. Estimating the amount of disaster waste as soon as possible is useful for planning on restoration and reconstruction. In this study, we propose a method to estimate the amount of disaster waste by getting map information of buildings in the stricken area.  Moreover, evaluation method to find better locations and suitable for temporal storage yard by considering both the estimated amount of waste and the distance between disaster area and temporal storage yard is proposed and support system is developed.

DOI： 10.14912/jsmcwm.23.0_193

CiNii Article

J-GLOBAL

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Development of Measurement Method for Pileup Rubble Waste by Using Silhouette Volume Intersection Reviewed

藤原健史

EICA 17 ( 2/3 ) 2012

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- Reviewed

藤原健史, 伊藤依理

地球環境研究論文集 20 2012

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

Yu-Chi Weng, Takeshi Fujiwara

WASTE MANAGEMENT 31 ( 6 ) 1393 - 1406 2011.6

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：PERGAMON-ELSEVIER SCIENCE LTD

In order to develop a sound material-cycle society, cost-effective municipal solid waste (MSW) management systems are required for the municipalities in the context of the integrated accounting system for MSW management. Firstly, this paper attempts to establish an integrated cost-benefit analysis (CBA) framework for evaluating the effectiveness of MSW management systems. In this paper, detailed cost/benefit items due to waste problems are particularly clarified. The stakeholders of MSW management systems, including the decision-makers of the municipalities and the citizens, are expected to reconsider the waste problems in depth and thus take wise actions with the aid of the proposed CBA framework. Secondly, focusing on the financial cost, this study develops a generalized methodology to evaluate the financial cost-effectiveness of MSW management systems, simultaneously considering the treatment technological levels and policy effects. The impacts of the influencing factors on the annual total and average financial MSW operation and maintenance (O&M) costs are analyzed in the Taiwanese case study with a demonstrative short-term future projection of the financial costs under scenario analysis. The established methodology would contribute to the evaluation of the current policy measures and to the modification of the policy design for the municipalities. Crown Copyright (C) 2011 Published by Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.wasman.2011.01.016

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

Nguyen Phuc Thanh, Yasuhiro Matsui, Takeshi Fujiwara

ENVIRONMENTAL MONITORING AND ASSESSMENT 175 ( 1-4 ) 23 - 35 2011.4

Language：English Publishing type：Research paper (scientific journal) Publisher：SPRINGER

Plastic solid waste has become a serious problem when considering the disposal alternatives following the sequential hierarchy of sound solid waste management. This study was undertaken to assess the quantity and composition of household solid waste, especially plastic waste to identify opportunities for waste recycling. A 1-month survey of 130 households was carried out in Can Tho City, the capital city of the Mekong Delta region in southern Vietnam. Household solid waste was collected from each household and classified into ten physical categories; especially plastic waste was sorted into 22 subcategories. The average household solid waste generation rate was 281.27 g/cap/day. The compostable and recyclable shares respectively accounted for high percentage as 80.74% and 11%. Regarding plastic waste, the average plastic waste generation rate was 17.24 g/cap/day; plastic packaging and plastic containers dominated with the high percentage, 95.64% of plastic waste. Plastic shopping bags were especially identified as the major component, accounting for 45.72% of total plastic waste. Relevant factors such as household income and household size were found to have an existing correlation to plastic waste generation in detailed composition. The household habits and behaviors of plastic waste discharge and the aspects of environmental impacts and resource consumption for plastic waste disposal alternatives were also evaluated.

DOI： 10.1007/s10661-010-1490-8

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

Jinmei YANG, Takeshi FUJIWARA, Yuzuru MATSUOKA, Wei WANG

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

Language：English Publishing type：Research paper (scientific journal) Publisher：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

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

Nguyen Phuc Thanh, Yasuhiro Matsui, Takeshi Fujiwara

JOURNAL OF ENVIRONMENTAL MANAGEMENT 91 ( 11 ) 2307 - 2321 2010.11

Language：English Publishing type：Research paper (scientific journal) Publisher：ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD

This study was undertaken to evaluate the quantity and composition of household solid waste to identify opportunities for waste recycling in Can Tho city, the capital city of the Mekong Delta region in southern Vietnam. Two-stage survey of 100 households was conducted for dry season and rainy season in 2009. Household solid waste was collected from each household and classified into 10 physical categories and 83 subcategories. The average household solid waste generation rate was 285.28 g per capita per day. The compostable and recyclable shares respectively accounted for 80.02% and 11.73%. The authors also analyzed the relations between some socioeconomic factors and household solid waste generation rates by physical categories and subcategories. The household solid waste generation rate per capita per day was positively correlated with the population density and urbanization level, although it was negatively correlated with the household size. The authors also developed mathematical models of correlations between the waste generation rates of main physical categories and relevant factors, such as household size and household income. The models were proposed by linear models with three variables to predict household solid waste generation of total waste, food waste, and plastic waste. It was shown that these correlations were weak and a relationship among variables existed. Comparisons of waste generation by physical compositions associated with different factors, such as seasonal and daily variation were conducted. Results presented that the significant average differences were found by the different seasons and by the different days in a week; although these correlations were weak. The greenhouse gas baseline emission was also calculated as 292.25 g (CO2 eq.) per capita per day from biodegradable components. (C) 2010 Elsevier Ltd. All rights reserved.

DOI： 10.1016/j.jenvman.2010.06.016

Application of Advanced Municipal Solid Waste Furnace Feeding System Using Stereo Image Processing System to a Real Plant

TAKAOKA Masaki, ITOH Daisuke, NAKATSUKA Daisuke, KAKUTA Yoshitada, TAKEDA Nobuo, FUJIWARA Takeshi, OSHITA Kazuyuki

EICA 15 ( 2 ) 221 - 224 2010.10

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

Yu-Chi Weng, Takeshi Fujiwara, Yuzuru Matsuoka

WASTE MANAGEMENT & RESEARCH 28 ( 3 ) 245 - 255 2010.3

Authorship：Last author Language：English Publishing type：Research paper (scientific journal) Publisher：SAGE PUBLICATIONS LTD

This paper presents a quantitative methodology and an empirical case study in Taiwan on modelling municipal solid waste (MSW) discards based on the consumption and MSW policy effects through a simultaneous equation system (SES) model. The results indicate that per capita consumption expenditures on 'food', 'household appliances' and 'amusement & education' are associated with the changes of the discards of most of the waste streams in Taiwan from 1992 to 2004. The developed model, meanwhile, identifies the effects of several important MSW policy measures. With regard to the model implication, consumers could try to reduce their unnecessary consumption, producers may rethink their responsibility on reducing MSW discards, and municipalities could evaluate the effectiveness of the existing policy measures to improve it upon based on the quantitative analysis. The backcasts and estimates of the discards of MSW streams could enable the planning, designing and executing of MSW system. The findings of this study would facilitate the consumer behaviour and support the policy design towards a low-waste-discard society.

DOI： 10.1177/0734242X09343305

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

Jinmei Yang, Takeshi Fujiwara, Yuzuru Matsuoka, Wei Wang

Journal of Global Environment Engineering 15 1 - 14 2010.2

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

This paper applies an integrated model to estimate the generation of municipal solid waste (MSW) by composition, taking into account the consumption expenditure by category and waste management policies. Five Chinese metropolises with different economic levels are selected for model application and comparison. In each selected city, firstly, a household consumption pattern is estimated using an extension of the linear expenditure system (LES), with lifestyle of residents attributed as explanatory variables; thereafter, MSW generation by composition is quantitatively expressed in terms of expenditure for consumption category and the waste policies by using ordinary least squares (OLS). The research findings clearly indicate that the integrated model is validated in each city with good performance of model testing. Further, the range of convention efficiency from consumption to each type of waste is determined. Moreover, the average unit MSW generation per consumption expenditure is 0.213 kg/RMB. In addition, the waste measures undertaken by the local governments have different influences on MSW generation. Accordingly, the model not only has the ability to predict the generation of each type of waste, but also presents a possibility of application to other Chinese cities without sufficient waste statistics.

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Study on Image Processing of Refuse Dumping in the Pit of Refuse Incinerator Plant Reviewed

FUJIWARA Takeshi, YOSHIKAWA Kaori, LIU Dawei, TSUJIMOTO Shinichi, MATSUDA Yoshiji

EICA 14 ( 2 ) 110 - 114 2009.10

The Effects of Heating Time and Temperature on de novo Synthesis of PCBs and CBzs in Fly Ash by Particle Size Reviewed

TAKAOKA Masaki, TANIGAKI Nobuhiro, TAKEDA Nobuo, FUJIWARA Takeshi

Journal of the Japan Society of Waste Management Experts 17 ( 1 ) 11 - 22 2006.1

Development of an Advanced Municipal Solid Waste Furnace Feeding Model and its Application Reviewed

ITOH Daisuke, TAKAOKA Masaki, NAKATSUKA Daisuke, KAKUTA Yoshitada, TAKEDA Nobuo, FUJIWARA Takeshi, OSHITA Kazuyuki

Journal of the Japan Society of Waste Management Experts 16 ( 3 ) 189 - 197 2005.5

Volume Measurement of Municipal Solid Waste in a Hopper Using the Stereo Image Processing Technique Reviewed

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

A STUDY ON SOLID WASTE GENERATION OF ASIAN COUNTRY USING REPORTED WASTE GENERATION DATA AND INDUSTRIAL STATISTIC Reviewed

Tsutomu Sasaki, Yuzuru Matsuoka, Takeshi Fujiwara

Environmental Systems Research 33 2005

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Papers - FUJIWARA Takeshi