title: Combining simultaneous nitrification-endogenous denitrification and phosphorus removal with post-denitrification for low carbon/nitrogen wastewater treatment.
abstract: Due to the limited nutrient removal from low carbon/nitrogen (⩽4) wastewater, a process combined simultaneous nitrification-endogenous denitrification and phosphorus removal (SNDPR) with post-denitrification (PD) in a SBR was proposed for deep-level nutrient removal without external carbon addition. SNDPR driven by PAOs and GAOs reduced PO4(3-)-P (98.3%) and partial TN (59.0%) at low DO conditions (0.5±0.1mg/L), and post-dentrification achieved further NOX(-) (produced by SNDPR) removal (24.0%) anoxically by utilizing the residual intracellular polymers in GAOs. Combined control of anaerobic/aerobic/anoxic durations and low DO inhibition to aerobic GAOs and NOB conducted partial nitrification-endogenous denitrification (PNED) (66%), which saved 44.3% intracellular polymers to further reduce 64% TN in effluent. After 115-day operation, the average effluent PO4(3-)-P and TN concentrations were 0.4 and 3.9mg/L, respectively, with 92.1% of TN removal. Highly enriched PAOs (36%±2%), GAOs (22%±2%) and AOB (15%±3%) over NOB (3%±1%) facilitated P uptake, PNED and post-denitrification in the SNDPR-PD system.
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China.
authors.forename: Xiaoxia
authors.initials: X
authors.lastname: Wang
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China. Electronic address: wsy@bjut.edu.cn.
authors.forename: Shuying
authors.initials: S
authors.lastname: Wang
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China.
authors.forename: Ji
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China.
authors.forename: Xian
authors.initials: X
authors.lastname: Dai
authors.affiliation: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China.
authors.forename: Yongzhen
authors.initials: Y
authors.lastname: Peng
mesh_terms: D000332:Aerobiosis; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000737:chemistry / Q000378:metabolism; D058440:Denitrification; D059013:Microbial Consortia / Q000502:physiology*; D058465:Nitrification; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism; D010710:Phosphates / Q000737:chemistry / Q000378:metabolism; D010758:Phosphorus / Q000302:isolation & purification / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000295:instrumentation / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*
chemical_list: D002244:Carbon; D009584:Nitrogen; D010710:Phosphates; D010758:Phosphorus; D062065:Wastewater
keywords: Glycogen accumulating organisms (GAOs); Partial nitrification (PN); Phosphorus accumulating organisms (PAOs); Post-denitrification (PD); Simultaneous nitrification-endogenous denitrification and phosphorus removal (SNDPR)