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phosphorus accumulation by bacteria isolated from a continuous-flow two-sludge system

Journal of Environmental Sciences 2007年第4期19卷 391-395页

作者： BAO Lin-lin LI Dong LI Xiang-kun HUANG Rong-xin ZHANG Jie LV Yang XIA Guang-qing School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China School of Architecture and Civil Engineering Beifing University of Technology Beifing 100022 China Institute of Geology and Geophysics of Jilin Province Changchun 130021 China

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 aeceptor, and the other one utilized either nitrate or oxygen as electron aeceptor. 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.

关键词： aerobic phosphorus accumulation anoxic phosphorus accumulation continuous-flow two-sludge system polyphosphateaccumulating organisms (PAOs)

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