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RBC 반응조를 이용한 2단 A/O 공정에서 유기물질 및 질소제거
최명섭,손인식 한국환경보건학회 2003 한국환경보건학회지 Vol.29 No.3
This study was conducted to investigate anoxic-RBC-anoxic-RBC process and its application to remove biologically organics and nitrogen. BOD and total-nitrogen(T-N) removal efficiencies were decreased as volumetric loading rate increased. But, the removal efficiency changes of T-N were little, as compared to BOD. Increase of internal recycle rate had few affect of BOD and T-N removal rates. Also, influent allocation(to 2nd anoxic reactor) had few affect of BOD removal efficiency rate. However, when the influent allocation rate was 30%, T-N removal efficiency was increased to 84.1 %. BOD/N ratio applied to 2nd anoxic reactor was increased to range of 3.65-4.37 as influent allocation rate increased to range 20∼35%. But, it might also cause adverse effect such as decrease of denitrification rate in excessive influent allocation rate.
유량-부하량관계식을 이용한 주암호 외남천 유역의 유황별 유달율 산정
최동호 ( Dong Ho Choi ),정재운 ( Jae Woon Jung ),이경숙 ( Kyoung Sook Lee ),최유진 ( Yu Jin Choi ),윤광식 ( Kwang Sik Yoon ),조소현 ( So Hyun Cho ),박하나 ( Ha Na Park ),임병진 ( Byung Jin Lim ),장남익 ( Nam Ik Chang ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.1
The objective of this study is to provide pollutant loads delivery ratio for flow duration in Oenam-cheon watershed, which is upstream watershed of Juam Lake. To calculate the delivery ratio by flow duration, rating curves and discharge-loads curves using measured data were established, then Flow Duration Curve(FDC) and pollutant loads delivery ratio curves were constructed. The results show that the delivery ratios for BOD5 for abundant flow(Q95), ordinary flow(Q185), low flow(Q275), and drought flow(Q355) were 23.9, 12.7, 7.1, and 2.9%, respectively. The delivery ratios of same flow regime for T-N were 58.4, 31.2, 17.2 and 7.1%, respectively. While, the delivery ratios T-P were 17.3, 7.5, 3.4, and 1.1% respectively. In general, delivery ratio of high flow condition showed higher value due to the influence of nonpoint source pollution. Based on the study results, generalized equations were developed for delivery ratio and discharge per unit area, which could be used for ungaged watershed with similar pollution sources.
음식물쓰레기 탈리액을 이용한 산업폐수의 생물학적 고도처리 실증실험
이병철 ( Byeong Cheol Lee ),안조환 ( Jo Hwan Ahn ),이정훈 ( Jung Hun Lee ),배우근 ( Woo Keun Bae ) 한국물환경학회 2011 한국물환경학회지 Vol.27 No.4
The feasibility of utilizing food waste leachate as an external carbon source was tested to enhance biological nutrient removal from an industrial wastewater with an average flow rate of 164,800 m3/d and a low carbon/nitrogen ratio of 2.8. A considerable improvement in the removal of nitrogen and phosphorus was observed when a certain amount of the leachate, ranging from 70 to 142 m3/d, was supplemented to the biological industrial wastewater treatment process. The addition of the leachate led to an increase in the BOD/N ratio (4.5) and the removal efficiency of nutritents from 29.7% to 71.7% for nitrogen and from 34.8% to 65.6% for phosphorus. However, an excessive dose of the leachate that significantly exceeded 120 m3/d caused serious operational problems, like oil-layer formation in the grit chamber and scum layer in the primary clarifier. Thus, an supplement of food waste leachate at a dose acceptable to an existing facilities can be a practical and effective means to enhance the nutrient removal from industrial wastewater and to dispose of the food waste leachate.