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KMID : 0364820090450020133
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Korean Journal of Microbiology
2009 Volume.45 No. 2 p.133 ~ p.139
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Dynamics of Total Phosphorus and Attached Bacteria in a Porous Medium Concentrating Nutrients from Low-Nutrient Water
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Kim Ju-Young
Nam Jong-Hyun
Jung Da-Woon
Cho Ahn-Na
Choi Seung-Ik
Ahn Tae-Seok
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Abstract
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A nutrient-concentrating system was operated to retrieve total phosphorus efficiently from a non-point pollution source. Attached bacteria were expected to play an important role in the system. Phosphorous was concentrated by formation of bacterial biofilms on rubberized coconut fiber media of the system. While concentration of total phosphorus (TP) ranged merely 0.12~0.35 mg/L in the stream water, TP levels in pore water and the media were 0.45~0.86 mg/L and 40.91~242.71 mg/kg, respectively. Total bacterial number (TBN) ranged 0.3~2.3×106 cells/ml in stream water, 0.4~4.4×106 cells/ml in pore water and 0.8~1.9×109 cells/g in media. There was a close correlation between TP and TBN. Based on band profiles in DGGE analyses, bacterial communities in the media were different from that in the stream water. Clostridium spp. were abundant in the stream water while Aquabacterium spp. were dominant species in early stages of biofilm formation in the media. The genera predominant in matured biofilms of the media were Clostridium and Enterococcus.
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KEYWORD
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biofilm, phosphorus, DGGE
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