title: Impact of Cr(VI) on P removal performance in enhanced biological phosphorus removal (EBPR) system based on the anaerobic and aerobic metabolism.
abstract: Influence of Cr(VI) on P removal in enhanced biological phosphorus removal (EBPR) system was investigated with respect to the composition of poly-phosphate-accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs), the transformation of poly-β-hydroxyalkanoates (PHA) and glycogen, enzymes' activities, and the intracellular Cr. Whether EBPR system could revive after Cr(VI) shock was also explored. Results showed P removal performance was completely inhibited by Cr(VI) with the concentration more than 5 mg L(-1). PAOs were more sensitive to Cr(VI) than GAOs and the other bacteria were. PHA consumption, glycogen synthesis and adenylate kinase's activity had been inhibited by 5 mg L(-1) Cr(VI). Both adenylate kinase's activity and P removal efficiency were negatively correlated with the intracellular Cr. Recovery experiments revealed that P removal performance with 5 mg L(-1) Cr(VI) shock could revive after a 2-day recovery treatment, while systems with high level Cr(VI) (20 and 60 mg L(-1)) shock could not.
authors.affiliation: School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Fang
authors.forename: Pei-de
authors.initials: PD
authors.lastname: Sun
authors.forename: Shao-juan
authors.initials: SJ
authors.lastname: Xu
authors.forename: Tao
authors.initials: T
authors.lastname: Luo
authors.forename: Ju-qing
authors.initials: JQ
authors.lastname: Lou
authors.forename: Jing-yi
authors.initials: JY
authors.lastname: Han
authors.forename: Ying-qi
authors.initials: YQ
authors.lastname: Song
mesh_terms: D000263:Adenylate Kinase / Q000378:metabolism; D001419:Bacteria / Q000187:drug effects / Q000378:metabolism*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D002857:Chromium / Q000032:analysis / Q000633:toxicity*; D006003:Glycogen / Q000378:metabolism; D017404:In Situ Hybridization, Fluorescence; D008856:Microscopy, Fluorescence; D010758:Phosphorus / Q000302:isolation & purification*; D054813:Polyhydroxyalkanoates / Q000378:metabolism; D013054:Spectrophotometry, Atomic; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000032:analysis*; D018508:Water Purification / Q000379:methods*
chemical_list: D000263:Adenylate Kinase; D002857:Chromium; D006003:Glycogen; D010758:Phosphorus; D054813:Polyhydroxyalkanoates; D062065:Wastewater