title: Improvement strategy on enhanced biological phosphorus removal for municipal wastewater treatment plants: full-scale operating parameters, sludge activities, and microbial features.
abstract: The poor quality of effluent discharged by municipal wastewater treatment plants (WWTPs) is threatening the safety of water ecology. This study, which integrated a field survey, batch tests, and microbial community identification, was designed to improve the effectiveness of the enhanced biological phosphorus removal (EBPR) process for WWTPs. Over two-thirds of the investigated WWTPs could not achieve total P in effluent lower than 0.5 mg/L, mainly due to the high ratio of chemical oxygen demand to P (28.6-196.2) in the influent. The rates of anaerobic P release and aerobic P uptake for the activated sludge varied from 0.22 to 7.9 mg/g VSS/h and 0.43 to 8.11 mg/g VSS/h, respectively. The fraction of Accumulibacter (PAOs: polyphosphate accumulating organisms) was 4.8 ± 2.0% of the total biomass, while Competibacter (GAOs: glycogen-accumulating organisms) accounted for 4.8 ± 6.4%. The anaerobic P-release rate was found to be an effective indicator of EBPR. Four classifications of the principal components were identified to improve the EBPR effluent quality and sludge activity.
authors.affiliation: College of Natural Research and Environmental Sciences, Institute of Environmental Science, ZheJiang University, KuanXian Avenue 268, HangZhou, ZheJiang Province 310029, PR China. zhangzhijian@zju.edu.cn
authors.forename: Zhijian
authors.initials: Z
authors.lastname: Zhang
authors.forename: Hui
authors.initials: H
authors.lastname: Li
authors.forename: Jun
authors.initials: J
authors.lastname: Zhu
authors.forename: Liu
authors.initials: L
authors.lastname: Weiping
authors.forename: Xu
authors.initials: X
authors.lastname: Xin
mesh_terms: D057919:Biological Oxygen Demand Analysis; D017404:In Situ Hybridization, Fluorescence; D010758:Phosphorus / Q000378:metabolism*; D025341:Principal Component Analysis; D020560:Proteobacteria / Q000378:metabolism*; D012722:Sewage / Q000382:microbiology*; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*; D018508:Water Purification / Q000379:methods*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D010758:Phosphorus