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

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

Volume 9, Special Issue (Eco-Friendly Sustainable Management) , November 2023, , Pages 35-46

https://doi.org/10.22034/GJESM.2023.09.SI.03

Abstract
  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 ...  Read More

Environmental Management
Optimization of solid waste collection system in a tourism destination

C. Le Dinh; T. Fujiwara; M. Asari; S.T. Pham Phu

Volume 8, Issue 3 , July 2022, , Pages 419-436

https://doi.org/10.22034/gjesm.2022.03.09

Abstract
  BACKGROUND AND OBJECTIVES: Prior to the COVID-19 pandemic, Hoi An City was one of the 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 also being experienced ...  Read More

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

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

Volume 4, Issue 4 , October 2018, , Pages 401-412

https://doi.org/10.22034/gjesm.2018.04.002

Abstract
  Kinetic models which can express the behaviors of hydrolysis and biogas generation more precisely than the conventional models were developed. The developed models were evaluated based on the experimental data of six batch reactors. Anaerobic digestion test was co-digestion of food and vegetable waste ...  Read More

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

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

Volume 4, Issue 3 , July 2018, , Pages 251-262

https://doi.org/10.22034/GJESM.2018.03.001

Abstract
  Coming out from the growth kinetics, the Gompertz model has been developed and considered as the best one for simulating the biogas production from anaerobic digestion. However, the model has failed to describe the starting point of the process, and no-sense of lag phase constant has been pointed out. ...  Read More

Suitability assessment for handling methods of municipal solid waste

B. Seng; T. Fujiwara; B. Seng

Volume 4, Issue 2 , April 2018, , Pages 113-126

https://doi.org/10.22034/gjesm.2018.04.02.001

Abstract
  Solid waste management is challenging in Phnom Penh city, Capital of Cambodia. The only one formal treatment taken is the final disposal of mixed waste into an open dumpsite. The current study analyses the physical and chemical characteristics of municipal solid waste disposed of in the dumpsite to assess ...  Read More

Analyzing solid waste management practices for the hotel industry

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

Volume 4, Issue 1 , January 2018, , Pages 19-30

https://doi.org/10.22034/gjesm.2018.04.01.003

Abstract
  The current study aims to analyze waste characteristics and management practices of the hotel industry in Hoi An, a tourism city in the center of Vietnam. Solid wastes from 120 hotels were sampled, the face-to-face interviews were conducted, and statistical methods were carried out to analyze the data. ...  Read More

Predicting waste generation using Bayesian model averaging

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

Volume 3, Issue 4 , December 2017, , Pages 385-402

https://doi.org/10.22034/gjesm.2017.03.04.005

Abstract
  A prognosis model has been developed for solid waste generation from households in Hoi An City, a famous tourist city in Viet Nam. Waste sampling, followed by a questionnaire survey, was carried out to gather data. The Bayesian model average method was used to identify factors significantly associated ...  Read More