title: Partial Nitrification and Denitrifying Phosphorus Removal in a Pilot-Scale ABR/MBR Combined Process.
abstract: A pilot-scale combined process consisting of an anaerobic baffled reactor (ABR) and an aerobic membrane bioreactor (MBR) for the purpose of achieving easy management, low energy demands, and high efficiencies on nutrient removal from municipal wastewater was investigated. The process operated at room temperature with hydraulic retention time (HRT) of 7.5 h, recycle ratio 1 of 200%, recycle ratio 2 of 100%, and dissolved oxygen (DO) of 1 mg/L and achieved good effluent quality with chemical oxygen demand (COD) of 25 mg/L, NH4 (+)-N of 4 mg/L, total nitrogen (TN) of 11 mg/L, and total phosphorus (TP) of 0.7 mg/L. The MBR achieved partial nitrification, and NO2 (-)-N has been accumulated (4 mg/L). Efficient short-cut denitrification was occurred in the ABR with a TN removal efficiency of 51%, while the role of denitrification and phosphorus removal removed partial TN (14%). Furthermore, nitrogen was further removed (11%) by simultaneous nitrification and denitrification in the MBR. In addition, phosphorus accumulating organisms in the MBR sufficiently uptake phosphorus; thus, effluent TP further reduced with a TP removal efficiency of 84%. Analysis of fluorescence in situ hybridization (FISH) showed that ammonia oxidizing bacteria (AOB) and phosphorus accumulating organisms (PAOs) were enriched in the process. In addition, the accumulation of NO2 (-)-N was contributed to the inhibition on the activities of the NOB rather than its elimination.
authors.affiliation: School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.
authors.forename: Peng
authors.initials: P
authors.lastname: Wu
authors.affiliation: School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.
authors.forename: Lezhong
authors.initials: L
authors.lastname: Xu
authors.affiliation: School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.
authors.forename: Jianfang
authors.initials: J
authors.lastname: Wang
authors.affiliation: School of Environmental and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
authors.forename: Zhenxing
authors.initials: Z
authors.lastname: Huang
authors.affiliation: College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, China.
authors.forename: Jiachao
authors.initials: J
authors.lastname: Zhang
authors.affiliation: School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China. ylshen@mail.usts.edu.cn.|Key Laboratory of Environmental Science and Engineering of Jiangsu Province, Suzhou University of Science and Technology, Suzhou, 215009, China. ylshen@mail.usts.edu.cn.|Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, Suzhou, 215009, China. ylshen@mail.usts.edu.cn.
authors.forename: Yaoliang
authors.initials: Y
authors.lastname: Shen
mesh_terms: D019149:Bioreactors / Q000382:microbiology*; D058465:Nitrification; D010758:Phosphorus / Q000378:metabolism*; D062065:Wastewater / Q000382:microbiology*; D018508:Water Purification / Q000379:methods*
chemical_list: D010758:Phosphorus; D062065:Wastewater
keywords: Aerobic processes; Anaerobic processes; Membrane bioreactors; Municipal wastewater; Nutrient removal