title: Gradient packing bed bio-filter for landfill methane mitigation.
abstract: We assessed the suitability of various biogenic materials for development of a gradient packed bed bio-filter to mitigate the methane (CH4) emission from landfills. Five different biogenic materials (windrow compost-WC; vermicompost-VC; landfill top cover-LTC; landfill bottom soil-LBS; and river soil sediment-SS) were screened. Among these materials, the VC showed a better CH4 oxidation potential (MOP) of 12.6μg CH4 gdw(-1)h(-1). Subsequently, the VC was used as a packing material along with wood chips in proto-type bio-filters. Wood chips were mixed at 5-15% to form three distinct gradients in a test bio-filter. Under the three different CH4 loading rates of 33, 44 and 55 gCH4 m(-3)h(-1), the achieved MOPs were 31, 41, and 47gCH4 m(-3)h(-1), respectively. The gradient packed bed bio-filter is effective for landfill CH4 mitigation than the conventional bio-filter as the latter shows gas channeling effects with poor MOPs.
authors.affiliation: Sino-Forest Applied Research Centre for Pearl River Delta Environment (ARCPE), Department of Biology, Hong Kong Baptist University, Hong Kong, China; College of Marine and Environmental Sciences, James Cook University, Townsville, Queensland, Australia. Electronic address: obulikartik@hkbu.edu.hk.
authors.forename: Parthiba Karthikeyan
authors.initials: PK
authors.lastname: Obulisamy
authors.affiliation: Department of Civil and Environmental Engineering, National University of Singapore, Singapore.
authors.forename: Jane
authors.initials: J
authors.lastname: Sim Yan May
authors.affiliation: Department of Civil and Environmental Engineering, National University of Singapore, Singapore.
authors.forename: Balasubramanian
authors.initials: B
authors.lastname: Rajasekar
mesh_terms: D001673:Biodegradation, Environmental; D005374:Filtration / Q000379:methods*; D008697:Methane / Q000032:analysis / Q000737:chemistry / Q000378:metabolism; D012987:Soil; D064091:Waste Disposal Facilities; D014934:Wood
chemical_list: D012987:Soil; D008697:Methane
keywords: Bio-filter; Landfill; Methane; Vermicompost; Wood chips