title: Potential application of biocover soils to landfills for mitigating toluene emission.
abstract: Biocover soils have been demonstrated to be a good alternative cover material to mitigate CH4 emission from landfills. To evaluate the potential of biocover soil in mitigating emissions of non-methane volatile organic compounds (NMVOCs) from landfills, simulated cover soil columns with the influx of toluene (chosen as typical of NMVOCs) concentrations of 102-1336 mg m(-3) in the presence or absence of the major landfill gas components (i.e., CH4 and CO2) were conducted in this study. In the two experimental materials (waste biocover soils (WBS) and landfill cover soils (LCS)), higher toluene reduction was observed in WBS with respect to LCS. After the introduction of landfill gas, an increase of microbial diversity and relative abundance of toluene-degrading bacteria and methanotrophs occurred in WBS. To illustrate the role of toluene-degrading activity in mitigating toluene emissions through landfill covers, an analytical model was developed by incorporating the steady-state vapor transport with the first-order kinetics of aerobic biodegradation limited by O2 availability. This study demonstrated that biocover soils have great potential in applying to landfills for mitigating toluene emission to the atmosphere.
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Yao
authors.initials: Y
authors.lastname: Su
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Junshen
authors.initials: J
authors.lastname: Pei
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
authors.forename: Baohu
authors.initials: B
authors.lastname: Tian
authors.affiliation: Institute of Environmental Science, Zhejiang University, Hangzhou 310058, China.
authors.forename: Fengxi
authors.initials: F
authors.lastname: Fan
authors.affiliation: Department of Optical Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Mengling
authors.initials: M
authors.lastname: Tang
authors.affiliation: Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Li
authors.affiliation: Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China. Electronic address: heruo@zju.edu.cn.
authors.forename: Ruo
authors.initials: R
authors.lastname: He
mesh_terms: D000327:Adsorption; D001673:Biodegradation, Environmental; D012987:Soil; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000378:metabolism*; D014050:Toluene / Q000378:metabolism*; D064091:Waste Disposal Facilities
chemical_list: D012987:Soil; D012989:Soil Pollutants; D014050:Toluene
keywords: Landfill cover soil; Landfill gas; Methane oxidation; Microbial community; Toluene degradation