Performance of Lab-Scale Membrane Bioreactor for Leachate from Go Cat Landfill in Ho Chi Minh City, Vietnam

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  • SANG NGUYEN NHU
    Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University
  • SODA SATOSHI
    Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University
  • SEI KAZUNARI
    Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University
  • ISHIGAKI TOMONORI
    Department of Environmental Solution Technology, Faculty of Science and Technology, Ryukoku University
  • TRIET LAM MINH
    Department of Natural Resources and Environment of Ho Chi Minh City, Vietnam
  • IKE MICHIHIKO
    Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University
  • FUJITA MASANORI
    Kochi National College of Technology

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Other Title
  • ラボスケール膜分離バイオリアクターによるベトナムホーチミン市のゴカット埋立処分場浸出水の処理成績
  • Performance of lab-sale membrane bioreactor for leachate from Go Cat landfill in Ho Chi Minh City, Vietnam

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Abstract

This study examined characteristics of leachate from the Go Cat landfill in Ho Chi Minh City, Vietnam and the performance of a lab-scale bioreactor equipped with a microfiltration unit (membrane bioreactor; MBR) for leachate treatment. The COD concentrations of leachate were 39.6–59.8 g l–1 and 1.1–4.0 g l–1 in the dry season (Nov. 2003 – Apr. 2004) and the rainy season (May – Aug. 2004), respectively, indicating that intensive precipitation of the monsoon climate in summer promotes leachate generation and changes in its quality because of the enhanced degradation and increased dilution. The BOD/COD ratio over 0.68 through the year suggested that biological wastewater treatment processes are promising for leachate treatment. The MBR was operated for 90 days at volumetric loading rates of 1.9–4.2 g－COD l–1 d–1. The microfiltration membrane kept the sludge concentration high in the MBR. The specific loading rate remained at 0.097–0.616 g－COD g－VSS–1 d–1 because of the high MLVSS concentration. The MBR showed high COD removal of 84–97% throughout the experimental period. Those results suggest that the effluent COD standard of 100 mg l–1 is probably achieved in the rainy season, but some post-treatment processes are needed, especially for the dry season.

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