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http://dx.doi.org/10.11001/jksww.2012.26.4.591

Quantitative distribution of denitrifying bacteria with nirS and nirK in MLE and A/O process  

Lim, Dong-Seok ((주)한화건설 기술연구소)
Kim, Yun-Jung ((주)포스코건설)
Kim, Hyung-Gun ((주)포스코건설)
Park, Seung-Guk ((주)한화건설 기술연구소)
Chung, Tai-Hak (서울대학교 건설환경공학부)
Publication Information
Journal of Korean Society of Water and Wastewater / v.26, no.4, 2012 , pp. 591-598 More about this Journal
Abstract
Denitrification is an important biological mechanism in wastewater treatment process because this process is technically to remove nitrogen from water to air. There have been lots of study about denitrification engineering and molecular biological research about denitrifying bacteria, respectively. However, combination of these researches was unusual and rare. This study is about the correlation between quantity of denitrifying bacteria and denitrification potential, and consists of NUR batch test as analysis method of denitrification potential and quantitative molecular analysis for denitrifying bacteria. Three reactors (A/O, MLE and A/O of nitrogen deficiency) are operated to get activated sludge with various denitrification potential. All samples which were acquired from reactors were measured denitrification potential by NUR test and NUiR test. Also, Real-time PCR was conducted for quantification of denitrifying bacteria composition in activated sludge. The various denitrification potentials were measured in the reactors. The denitrifiaction potential was the highest in MLE process and the reactor of the nitrogen deficiency showed the lowest. Genomic DNA of activated sludge was obtained and consequently, real-time PCRuse the primer sets of nirK and nirS　were conducted to quantify genes involving denitrification reductase production. As the result of real-time PCR, nirK gene showed more significant influence on denitrification potential comapred with nirS gene.
Keywords
Denitrifying potential; nirS; nirK; real-time PCR; nitrite reductase;
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