title: Acceleration of aged-landfill stabilization by combining partial nitrification and leachate recirculation: a field-scale study.
abstract: Leachate recirculation for rapid landfill stabilization can result in the accumulation of high-strength ammonium. An on-site sequencing batch reactor (SBR) was therefore, applied to oxidize the ammonium to nitrite, which was then recirculated to the landfill for denitrification to nitrogen gas. At relatively higher ammonium levels, nitrite accumulated well in the SBR; the nitrite was denitrified stably in the landfill, despite an insufficient biodegradable carbon source in the leachate. As the leachate was recirculated, the methane and carbon dioxide contents produced from the landfill fluctuated, implying that the organic acids and hydrogen produced in the acid production phase acted as the carbon source for denitrification in the landfill. Leachate recirculation combined with ex-situ partial nitrification of the leachate may enhance the biodegradation process by: (a) removing the nitrogen that is contained with the leachate, and (b) accelerating landfill stabilization, because the biodegradation efficiency of landfill waste is increased by supplying sufficient moisture and its byproducts are used as the carbon source for denitrification. In addition, partial nitrification using an SBR has advantages for complete denitrification in the landfill, since the available carbon source is in short supply in aged landfills.
authors.affiliation: R&D Center, Samsung Engineering Co., Ltd., 415-10 Woncheon-dong, Youngtong-gu, Suwon, Gyeonggi-do 443-823, Republic of Korea.
authors.forename: Jinwook
authors.initials: J
authors.lastname: Chung
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea.
authors.forename: Seungjin
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea.
authors.forename: Seungcheon
authors.initials: S
authors.lastname: Baek
authors.affiliation: Department of Environmental & Energy Engineering, Anyang University, 22 Samdeok-ro, 37 Beon-gil, Manan-gu, Anyang, Gyeonggi-do 430-714, Republic of Korea.
authors.forename: Nam-Hoon
authors.initials: NH
authors.lastname: Lee
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea.
authors.forename: Seongjun
authors.initials: S
authors.lastname: Park
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea.
authors.forename: Junghun
authors.initials: J
authors.lastname: Lee
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea.
authors.forename: Heechang
authors.initials: H
authors.lastname: Lee
authors.affiliation: Department of Civil and Environmental Engineering, Hanyang University, Sa 3-dong, Sangnok-gu, Ansan, Gyeonggi-do 426-791, Republic of Korea. Electronic address: wkbae@hanyang.ac.kr.
authors.forename: Wookeun
authors.initials: W
authors.lastname: Bae
mesh_terms: D064751:Ammonium Compounds / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002245:Carbon Dioxide / Q000378:metabolism; D008697:Methane / Q000378:metabolism; D058465:Nitrification; D009573:Nitrites / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism; D010084:Oxidation-Reduction; D064091:Waste Disposal Facilities; D014874:Water Pollutants, Chemical / Q000378:metabolism*
chemical_list: D064751:Ammonium Compounds; D009573:Nitrites; D014874:Water Pollutants, Chemical; D002245:Carbon Dioxide; D009584:Nitrogen; D008697:Methane
keywords: Landfill; Leachate recirculation; Nitritation/denitritation; Sequencing batch reactor (SBR); Stabilization