title: Nitrogen removal from low COD/TN ratio manure-free piggery wastewater within an upflow microaerobic sludge reactor.
abstract: An upflow microaerobic sludge reactor (UMSR) was constructed in treating manure-free piggery wastewater with high ammonium concentration and a COD/TN ratio as low as 0.84. The UMSR offered an outstanding removal of NH4(+)-N and TN at 35°C and hydraulic retention time 8h subsequent to inoculated sludge acclimation. A short NO2(-)-N accumulation phase was observed whenever there was a considerable increase in TN loading rate (NLR), but decreased rapidly along with an evident increase in TN removal. Fed with raw wastewater at a NLR of 1.10 kg/(m(3)d), the average COD, NH4(+)-N and TN removal reached 0.72, 0.76 and 0.94 kg/(m(3)d), respectively. Inference drawn from stoichiometry based on the potential nitrogen removal pathways and the C/N ratio required by denitrification indicated that anammox was the main mechanism for NH4(+)-N and TN removal in the UMSR.
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
authors.forename: Jia
authors.initials: J
authors.lastname: Meng
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
authors.forename: Jiuling
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China. Electronic address: ljz6677@163.com.
authors.forename: Jianzheng
authors.initials: J
authors.lastname: Li
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
authors.forename: Philip
authors.initials: P
authors.lastname: Antwi
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
authors.forename: Kaiwen
authors.initials: K
authors.lastname: Deng
authors.affiliation: State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, 73 Huanghe Road, Harbin 150090, PR China.
authors.forename: Cheng
authors.initials: C
authors.lastname: Wang
authors.affiliation: Centre de Recherche Industrielle du Québec, 333 Franquet, Québec G1P 4C7, Canada.
authors.forename: Gerardo
authors.initials: G
authors.lastname: Buelna
mesh_terms: D000332:Aerobiosis; D000818:Animals; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D009584:Nitrogen / Q000302:isolation & purification*; D013552:Swine; D062065:Wastewater / Q000737:chemistry*; D018508:Water Purification
chemical_list: D009584:Nitrogen; D062065:Wastewater
keywords: High ammonium; Low C/N ratio; Microaerobic process; Nitrogen removal; Piggery wastewater