Effect of increasing salinity on biogas production in waste landfills with leachate recirculation: A lab-scale model study

AbstractThe effects of salinity on anaerobic waste degradation and microbial communities were investigated, in order to propose an appropriate leachate recirculation process in a waste landfill in a tropical region. A salt concentration of 21mScm−1 of electrical conductivity (EC) did not affect waste degradation, but a salt concentration of 35mScm−1 of EC inhibited CH4 generation. A higher salt concentration of 80mScm−1 of EC inhibited not only CH4 and CO2 generation, but also degradation of organic compounds. The bacterial and archaeal community compositions were affected by high salinity. High salinity can exert selective pressure on bacterial communities, resulting in a change in bacterial community structure. Ammonium caused strong, dominant inhibition of biogas production in the salt concentration range of this study. Quality control, especially of ammonium levels, will be essential for the promotion of waste biodegradation in landfills with leachate recirculation

Engineering Measures for Isolation and Sequestration of Heavy Metals in Waste as Safe Final Sink

The long-term safety management of hazardous substances is essential to the development of an environmentally sound resource circulation society. To achieve this, engineering measures to attenuate environmental risks in the isolation and sequestration of hazardous heavy metals are reviewed. From the standpoint of the isolation and sequestration of heavy metals from resource circulation, we assess the challenges in implementing immobilization technologies, constructing updated isolation structures, and controlling environmental conditions. It is also focused intensively on the (bio) chemical transformation behavior of heavy metals and its effect on the migration of the transformed materials in the environment. The contributions of solubilized and gasified metal components to emission into the environment are considered. The obtained results underscore the necessity of multiple barriers to retard and attenuate the migration of hazardous heavy metals. Innovative schemes for the isolation and sequestration of heavy metals will lead to higher levels of safety and environmentally sound resource circulation

COD REMOVAL BY LAB-SCALE MEMBRANE ACTIVATED SLUDGE PROCESS FROM LEACHATE OF GO CAT LANDFILL IN HOCHIMINH CITY

Joint Research on Environmental Science and Technology for the Eart

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

『大阪大学大学院工学研究科環境・エネルギー工学専攻生物圏環境工学領域 研究活動報告』, (2006.4.1～2007.3.31), pp.79～85, 大阪大学大学院工学研究科環境・エネルギー工学専攻環境資源・材料学講座生物圏環境工学領域, 2007.6 に掲

ADVANCED OXIDATION TREATMENT OF THE LEACHATE COLLECTED FROM WASTE DISPOSAL LANDFILL SITE IN HANOI, VIETNAM : APPLICATION AND ITS EFFECTS

Joint Research on Environmental Science and Technology for the Eart