title: A comparison of CH4, N2O and CO2emissions from three different cover types in a municipal solid waste landfill.
abstract: High-density polyethylene (HDPE) membranes are commonly used as a cover component in sanitary landfills, although only limited evaluations of its effect on greenhouse gas (GHG) emissions have been completed. In this study, field GHG emission were investigated at the Dongbu landfill, using three different cover systems: HDPE covering; no covering, on the working face; and a novel material-Oreezyme Waste Cover (OWC) material as a trial material. Results showed that the HDPE membrane achieved a high CH4retention, 99.8% (CH4mean flux of 12 mg C m-2h-1) compared with the air-permeable OWC surface (CH4 mean flux of 5933 mg C m-2h-1) of the same landfill age. Fresh waste at the working face emitted a large fraction of N2O, with average fluxes of 10 mg N m-2h-2, while N2O emissions were small at both the HDPE and the OWC sections. At the OWC section, CH4emissions were elevated under high air temperatures but decreased as landfill age increased. N2O emissions from the working face had a significant negative correlation with air temperature, with peak values in winter. A massive presence of CO2was observed at both the working face and the OWC sections. Most importantly, the annual GHG emissions were 4.9 Gg yr-1in CO2equivalents for the landfill site, of which the OWC-covered section contributed the most CH4(41.9%), while the working face contributed the most N2O (97.2%). HDPE membrane is therefore, a recommended cover material for GHG control.
  
  
  
  Monitoring of GHG emissions at three different cover types in a municipal solid waste landfill during a 1-year period showed that the working face was a hotspot of N2O, which should draw attention. High CH4fluxes occurred on the permeable surface covering a 1- to 2-year-old landfill. In contrast, the high-density polyethylene (HDPE) membrane achieved high CH4retention, and therefore is a recommended cover material for GHG control.
authors.affiliation: a CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , People's Republic of China.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Wang
authors.affiliation: a CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , People's Republic of China.
authors.forename: Mingsheng
authors.initials: M
authors.lastname: Jia
authors.affiliation: a CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , People's Republic of China.
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Lin
authors.affiliation: a CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , People's Republic of China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Xu
authors.affiliation: a CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , People's Republic of China.
authors.forename: Xin
authors.initials: X
authors.lastname: Ye
authors.affiliation: b Institute of Environmental Engineering , National Sun Yat-Sen University , Kaohsiung , Taiwan, Republic of China.
authors.forename: Chih Ming
authors.initials: CM
authors.lastname: Kao
authors.affiliation: a CAS Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences , Xiamen , People's Republic of China.
authors.forename: Shaohua
authors.initials: S
authors.lastname: Chen
mesh_terms: D000393:Air Pollutants / Q000032:analysis*; D002245:Carbon Dioxide / Q000032:analysis*; D017752:Greenhouse Effect; D008697:Methane / Q000032:analysis*; D009609:Nitrous Oxide / Q000032:analysis*; D020959:Polyethylene; D012621:Seasons; D062611:Solid Waste; D064091:Waste Disposal Facilities
chemical_list: D000393:Air Pollutants; D062611:Solid Waste; D002245:Carbon Dioxide; D020959:Polyethylene; D009609:Nitrous Oxide; D008697:Methane