title: Treating low carbon/nitrogen (C/N) wastewater in simultaneous nitrification-endogenous denitrification and phosphorous removal (SNDPR) systems by strengthening anaerobic intracellular carbon storage.
abstract: A novel simultaneous nitrification denitrification and phosphorous removal-sequencing batch reactor (SNDPR-SBR) enriched with PAOs (phosphorus accumulating organisms), DPAOs (denitrifying PAOs), and GAOs (glycogen accumulating organisms) at the ratio of 2:1:1 was developed to achieve the simultaneous nutrient and carbon removal treating domestic wastewater with low carbon/nitrogen ratio (≤3.5). The SNDPR system was operated for 120 days at extended anaerobic stage (3 h) and short aerobic stage at low oxygen concentration (2.5 h) with short sludge retention time (SRT) of 10.9 d and hydraulic retention time (HRT) of 14.6 h. The results showed that at the stable operating stage, the average effluent chemical oxygen demand (COD) and PO4(3-)-P concentrations were 47.2 and 0.2 mg L(-1), respectively, the total nitrogen (TN) removal efficiency was 77.7%, and the SND efficiency reached 49.3%. Extended anaerobic stage strengthened the intracellular carbon (mainly poly-β-hydroxybutyrate, PHB) storage, efficiently utilized the organic substances in wastewater, and provided sufficient carbon sources for denitrification and phosphorus uptake without external carbon addition. Short aerobic stage at low oxygen concentration (dissolved oxygen (DO): 1 ± 0.3 mg L(-1)) achieved a concurrence of nitrification, endogenous denitrification, denitrifying and aerobic phosphorus uptake, and saved about 65% energy consumption for aeration. Microbial community analysis demonstrated that P removal was mainly performed by aerobic PAOs while N removal was mainly carried out by denitrifying GAOs (DGAOs), even though DPAOs were also participated in both N and P removal.
authors: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China.
authors: Xiaoxia
authors: X
authors: Wang
authors: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China.
authors: Shuying
authors: S
authors: Wang
authors: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China.
authors: Tonglai
authors: T
authors: Xue
authors: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China; Department of Civil and Environmental Engineering, University of Connecticut, Storrs, CT, 06269, USA.
authors: Baikun
authors: B
authors: Li
authors: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China.
authors: Xian
authors: X
authors: Dai
authors: Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, PR China. Electronic address: pyz@bjut.edu.cn.
authors: Yongzhen
authors: Y
authors: Peng
mesh_terms: D000693:Anaerobiosis; D001419:Bacteria / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology*; D002244:Carbon / Q000378:metabolism*; D058440:Denitrification; D006885:Hydroxybutyrates / Q000378:metabolism; D058465:Nitrification; D010758:Phosphorus / Q000378:metabolism*; D011091:Polyesters / Q000378:metabolism; D012722:Sewage / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods; D062065:Wastewater; D018508:Water Purification / Q000379:methods*; D000094122:Polyhydroxybutyrates
chemical_list: D002244:Carbon; D006885:Hydroxybutyrates; D010758:Phosphorus; D011091:Polyesters; D012722:Sewage; D062065:Wastewater; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates
keywords: Extended anaerobic stage; Glycogen accumulating organisms (GAOs); Low carbon/nitrogen sewage; Phosphorous accumulating organisms (PAOs); Simultaneous nitrification-endogenous denitrification and phosphorous removal (SNDPR) system