title: Phosphorus accumulation by bacteria isolated from a continuous-flow two-sludge system.
abstract: In this article, polyphosphate-accumulating organisms (PAOs) from a lab-scale continuous-flow two-sludge system was isolated and identified, the different phosphorus accumulation characteristics of the isolates under anoxic and aerobic conditions were investigated. Two kinds of PAOs were both found in the anoxic zones of the two-sludge system, one of them utilized only oxygen as electron acceptor, and the other one utilized either nitrate or oxygen as electron acceptor. Of the total eight isolates, five isolates were capable of utilizing both nitrate and oxygen as electron acceptors to uptake phosphorus to some extent. And three of the five isolates showed good phosphorus accumulative capacities both under anoxic or aerobic conditions, two identified as Alcaligenes and one identified as Pseudomonas. Streptococcus was observed weak anoxic phosphorus accumulation because of its weak denitrification capacity, but it showed good phosphorus accumulation capacity under aerobic conditions. One isolates identified as Enterobacteriaceae was proved to be a special species of PAOs, which could only uptake small amounts of phosphorus under anoxic conditions, although its denitrification capacity and aerobic phosphorus accumulation capacity were excellent.
authors.affiliation: School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China. jialin01_01@126.com
authors.forename: Lin-lin
authors.initials: LL
authors.lastname: Bao
authors.forename: Dong
authors.initials: D
authors.lastname: Li
authors.forename: Xiang-kun
authors.initials: XK
authors.lastname: Li
authors.forename: Rong-xin
authors.initials: RX
authors.lastname: Huang
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: L V
authors.initials: LV
authors.lastname: Yang
authors.forename: Guang-qing
authors.initials: GQ
authors.lastname: Xia
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D001419:Bacteria / Q000302:isolation & purification / Q000378:metabolism*; D019149:Bioreactors; D015169:Colony Count, Microbial; D009566:Nitrates / Q000378:metabolism; D010100:Oxygen / Q000378:metabolism; D010758:Phosphorus / Q000378:metabolism*
chemical_list: D009566:Nitrates; D010758:Phosphorus; D010100:Oxygen