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KMID : 0364820180540020105
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Korean Journal of Microbiology
2018 Volume.54 No. 2 p.105 ~ p.112
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A study on the denitrification and microbial community characteristics by the change of C/N ratio of molasses and nitrate nitrogen
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Eom Han-Ki
Kim Sung-Chul
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Abstract
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To compare the denitrification efficiency, this study usedmolasses and methanol were used as external carbon sources. Specific experimental conditions were classified according toC/N ratio conditions. The batch test showed that the denitrificationefficiency increased as C/N ratios of molasses andmethanol rose. The most suitable C/N ratio of molasses turnedout 4:1 considering the concentration of the residue chemicaloxygen demand (COD) and the denitrification efficiency,which was 91.4%. Specific denitrification rate (SDNR) drawnas a kinetic factor demonstrated that molasses and methanolshowed similar SDNR values as C/N ratios of molasses andmethanol increased. Under the condition of C/N ratio 4:1, 0.0292g NO3￣-N removal/g mixed liquor volatile suspended solid(MLVSS)/day (molasses), 0.0299 g NO3 ￣-N removal/g MLVSS/day (methanol) were found. Sludge adapted to molasses showedthat Bacterium Pseudomonas sp. and Bergeylla sp. dominatedthrough an analysis of microbial community. In addition,some bacteria were high convergences than the variety ofmicrobial community. Accordingly, it was assumed thatmolasses focus on growing microorganisms specialized indenitrification and applied as a replaceable external carbon sourcethat can enhance denitrification performance.
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KEYWORD
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C/N ratio (Carbon and Nitrogen ratio), denitrification, molasses, microbial community, SDNR (Specific Denitrification Rate)
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