title: Effect of increasing salinity on biogas production in waste landfills with leachate recirculation: A lab-scale model study.
abstract: The 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 21 mS cm-1of electrical conductivity (EC) did not affect waste degradation, but a salt concentration of 35 mS cm-1of EC inhibited CH4generation. A higher salt concentration of 80 mS cm-1of EC inhibited not only CH4and CO2generation, 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.
authors.affiliation: Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Yuka
authors.initials: Y
authors.lastname: Ogata
authors.affiliation: Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Tomonori
authors.initials: T
authors.lastname: Ishigaki
authors.affiliation: Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Mikako
authors.initials: M
authors.lastname: Nakagawa
authors.affiliation: Center for Material Cycles and Waste Management Research, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba, Ibaraki 305-8506, Japan.
authors.forename: Masato
authors.initials: M
authors.lastname: Yamada
keywords: Biogas production; Leachate recirculation; Microbial communities; Salt accumulation; Waste landfill