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하수처리 방류수 BOD5 중 NOD 기여율에 관한 연구
민경우 ( Kyoung Woo Min ),정원삼 ( Won Sam Jeong ),이대행 ( Dae Haeng Lee ),서광엽 ( Gwang Yeob Seo ),김승호 ( Seung Ho Kim ),백계진 ( Ke Jin Paik ),문용운 ( Young Woon Mun ) 한국환경분석학회 2011 환경분석과 독성보건 Vol.14 No.1
In this study, BOD5, CBOD, NOD, T-N etc. were analyzed for influent and effluent samples collected from two sewage treatment plants(STPs) and for river water samples. The sampling took place from March to October, 2010. The NOD contribution to BOD5 varied with the sampling site, NOD accounts for 10~15% of BOD5 for STP influent, 45~56% for STP effluent, 3~26% for the stream water, respectively. The contribution of NOD to BOD5 also varied with water temperature, the contribution ratio was about 20% during the summer (July-September), however NOD portion of BOD5 was 50%~60% during the spring and the fall. In addition, the experimental NOD values for STP effluent were compared to theoretical NOD ones. The ratio of theoretical value to experimental one was 0.89~1.21 implying that the experimental value would be very close to the theoretical one. BOD5 and various types of nitrogen were analyzed for 10 days. Some samples showed complete nitrification and some did not. One sample showed nitrification immediately after 5 days of incubation.