title: Stimulation of waste decomposition in an old landfill by air injection.
abstract: Three pilot-scale lysimeters were operated for 4.5years to quantify the change in the carbon and nitrogen pool in an old landfill under various air injection conditions. The results indicate that air injection at the bottom layer facilitated homogeneous distribution of oxygen in the waste matrix. Substantial total organic carbon (TOC) decomposition and methane generation reduction were achieved. Considerable amount of nitrogen was removed, suggesting that in situ nitrogen removal via the effective simultaneous nitrification and denitrification mechanism is viable. Moreover, material mass change measurements revealed a slight mass reduction of aged MSW (by approximately 4.0%) after 4.5years of aeration. Additionally, experiments revealed that intensive aeration during the final stage of the experiment did not further stimulate the degradation of the aged MSW. Therefore, elimination of the labile fraction of aged MSW should be considered the objective of in situ aeration.
authors.affiliation: Department of Environmental Engineering, School of Energy and Environmental Engineering, University of Science and Technology Beijing, 30 Xueyuan Road, Haidian District, Beijing 100083, China; Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Chuanfu
authors.initials: C
authors.lastname: Wu
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Shimaoka
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Hirofumi
authors.initials: H
authors.lastname: Nakayama
authors.affiliation: Department of Urban and Environmental Engineering, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Teppei
authors.initials: T
authors.lastname: Komiya
authors.affiliation: The State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, Shanghai 200092, China. Electronic address: xlchai@tongji.edu.cn.
authors.forename: Xiaoli
authors.initials: X
authors.lastname: Chai
mesh_terms: D000332:Aerobiosis; D000388:Air; D002244:Carbon / Q000032:analysis; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000032:analysis; D012037:Refuse Disposal / Q000379:methods; D062611:Solid Waste / Q000032:analysis; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D009930:Organic Chemicals; D062611:Solid Waste; D014874:Water Pollutants, Chemical; D002244:Carbon; D009584:Nitrogen
keywords: Aeration modes; In situ nitrogen removal; Landfill lysimeter; Methane production inhibition; Spatiotemporal distribution