title: Impact assessment of intermediate soil cover on landfill stabilization by characterizing landfilled municipal solid waste.
abstract: Waste samples at different depths of a covered municipal solid waste (MSW) landfill in Beijing, China, were excavated and characterized to investigate the impact of intermediate soil cover on waste stabilization. A comparatively high amount of unstable organic matter with 83.3 g kg(-1) dry weight (dw) total organic carbon was detected in the 6-year-old MSW, where toxic inorganic elements containing As, Cd, Cr, Cu, Mn, Ni, Pb, and Zn of 10.1, 0.98, 85.49, 259.7, 530.4, 30.5, 84.0, and 981.7 mg kg(-1) dw, respectively, largely accumulated because of the barrier effect of intermediate soil cover. This accumulation resulted in decreased microbial activities. The intermediate soil cover also caused significant reduction in moisture in MSW under the soil layer, which was as low as 25.9%, and led to inefficient biodegradation of 8- and 10-year-old MSW. Therefore, intermediate soil cover with low permeability seems to act as a barrier that divides a landfill into two landfill cells with different degradation processes by restraining water flow and hazardous matter.
authors.affiliation: School of Environment, Tsinghua University, Beijing 100084, China.
authors.forename: Guangxia
authors.initials: G
authors.lastname: Qi
authors.forename: Dongbei
authors.initials: D
authors.lastname: Yue
authors.forename: Jianguo
authors.initials: J
authors.lastname: Liu
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.forename: Xiaochong
authors.initials: X
authors.lastname: Shi
authors.forename: Liang
authors.initials: L
authors.lastname: He
authors.forename: Jingting
authors.initials: J
authors.lastname: Guo
authors.forename: Haomei
authors.initials: H
authors.lastname: Miao
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Nie
mesh_terms: D001673:Biodegradation, Environmental; D002681:China; D008670:Metals / Q000378:metabolism; D059013:Microbial Consortia; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil; D012988:Soil Microbiology; D062611:Solid Waste / Q000032:analysis; D064091:Waste Disposal Facilities; D014867:Water
chemical_list: D008670:Metals; D012987:Soil; D062611:Solid Waste; D014867:Water
keywords: Intermediate cover; Landfill; Municipal solid waste; Stabilization