title: Evaluation and statistical optimization of methane oxidation using rice husk amended dumpsite soil as biocover.
abstract: A laboratory scale study was conducted to investigate the effect of rice husk amended biocover to mitigate the CH4 emission from landfills. Various physico-chemical and environmental variables like proportion of amended biocover material (rice husk), temperature, moisture content, CH4 concentration, CO2 concentration, O2 concentration and incubation time were considered in the study which affect the CH4 bio-oxidation. For the present study, sequential statistical approach with Placket Burman Design (PBD) was used to identify significant variables, having influential role on CH4 bio-oxidation, from all variables. Further, interactive effect of four selected variables including rice husk proportion, temperature, CH4 concentration and incubation time was studied with Box-Behnken Design (BBD) adopting Response Surface Methodology (RSM) to optimize the conditions for CH4 oxidation. In this study, the maximum CH4 oxidation potential of 76.83μgCH4g(-1)dwh(-1) was observed under optimum conditions with rice husk amendment of 6% (w/w), 5h incubation time at 40°C temperature with 40% (v/v) initial CH4 concentration. The results for CH4 oxidation potential also advocated the suitability of rice husk amendment in biocover system to curb emitted CH4 from landfills/open dumpsite over conventional clay or sand cover on supplying CH4 and O2 to microbes on maintaining proper aeration.
authors.affiliation: Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India; School of Public Health, Post Graduate Institute of Medical Education and Research, Chandigarh 160012, India. Electronic address: sk_somvir@yahoo.com.
authors.forename: Somvir
authors.initials: S
authors.lastname: Bajar
authors.affiliation: Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India; Department of Environmental Sciences, Central University of Jammu, Jammu & Kashmir 180011, India.
authors.forename: Anita
authors.initials: A
authors.lastname: Singh
authors.affiliation: Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India.
authors.forename: C P
authors.initials: CP
authors.lastname: Kaushik
authors.affiliation: Department of Environmental Science and Engineering, Guru Jambheshwar University of Science and Technology, Hisar 125001, Haryana, India; University School of Environment Management, Guru Gobind Singh Indraprastha University, Dwarka, New Delhi 110075, India.
authors.forename: Anubha
authors.initials: A
authors.lastname: Kaushik
mesh_terms: D005308:Fertilizers; D008697:Methane / Q000032:analysis* / Q000737:chemistry; D010084:Oxidation-Reduction; D012037:Refuse Disposal / Q000379:methods*; D012987:Soil / Q000737:chemistry*; D064091:Waste Disposal Facilities
chemical_list: D005308:Fertilizers; D012987:Soil; D008697:Methane
keywords: BBD; Biocover; CH(4) oxidation; Landfills; PBD; Rice husk