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Changes of the Bacterial Community Structure Depending on Carbon Source in Biological Phosphate Removing Process  

Yeo, Sang-Min (Department of Life Science, Dae-Gu University)
Lee, Young-Ok (Department of Life Science, Dae-Gu University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.2, 2006 , pp. 165-172 More about this Journal
Abstract
In order to analyze the bacterial community structure including P-removal related organisms, PAOs(polyphosphate accumulating organisms) and GAOs(glycogen-accumulating non-poly-P organisms) occurred in biological phosphate removing process, 2 reactors(SBR; sequencing batch reactor) were operated on different carbon sources(sodium acetate, glucose). For the analysis of bacterial community structure, molecular methods(FISH: fluorescent in situ hybridization and DGGE; denaturing gel gradient electrophoresis) were employed. After 100 days reaction, $PO_4-P$ in effluent dropped to 3.92 mg/L in SBR #1(60.8% removal) fed by sodium acetate, and at the same time FISH results showed that ${\beta}$-subclass proteobacteria(39.67%) and PAOs(45.10%) were dominantly present whereas those value in SBR #2 fed by glucose was 8.30 mg/L(17% removal), and ${\gamma}$-subclass proteobacteria were considerably observed(23.89%) and PAOs was 21.42%. Also the result of DGGE indicated that ${\beta}$-subclass proteobacteria was dominantly observed in SBR #1. However as the temperature increased, the proportion of ${\beta}$-subclass proteobacteria and PAOs decreased, but phosphorus removing inhibitors(GAOs) increased. It suggests that the environmental factor like as temperature and types of carbon source had influence on the prevalence of phosphorus removing organism(PAOs) and phosphorus removing inhibitors(GAOs) in biological phosphate removing process.
Keywords
P-removal; PAOs; GAOs/TFOs; FISH; DGGE;
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