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MLVSS에 따른 Jet Loop Reactor (JLR)에서 동력량과 공기량이 산소전달률에 미치는 영향
윤애화(Ae Hwa Yoon),배종훈(Jong Hun Bae),임현우(Hyun Woo Lim),전항배(Hang Bae Jun),허태영(Tae Young Huh) 大韓環境工學會 2011 대한환경공학회지 Vol.33 No.12
산소전달률은 음폐수, 축산폐수 그리고 매립지 침출수와 같은 고농도 폐수처리를 호기성 공정으로 처리할 시 그 성과를 결정하는 아주 중요한 요소이다. 본 논문에서는, Jet Loop Reactor (JLR)를 이용하여 공기유량과 동력량을 운전조건의 변수로 두고 미생물의 농도에 따른 산소소비율(Oxygen uptake rate, OUR)과 물질전달계수(Volumetric mass transfer coefficient, KL·a)를 측정하였으며, 산출된 KL·a 값의 결과를 가지고 통계학적인 분석을 통하여 비선형 회귀 모형을 제안하여 보았다. 연구 결과, 미생물 농도를 높게 유지시켜야 하는 고농도 폐수를 적용할 경우에는, 동력량과 공기량은 산소전달률의 중요한 인자이며, 마지막으로 최종 비선형 회귀모형을 동력량과, 공기량 그리고 점성계수의 함수로 나타내보았다. Oxygen transfer rate generally determines the performance of an aerobic wastewater treatment process that treats high strength wastewater such as food wastewater, animal wastewater and landfill leachate. In this paper, OUR and KL·a were evaluated by using Jet Loop Reactor (JLR) according to the concentration of a mixed liquor volatile suspended solid (MLVSS), oxygen (air) flow rate and energy input as the variable of the operating conditions. Also, a nonlinear regression model was proposed by the statistical methods with the calculated KL·a. As a results, in case of applying the high strength wastewater which has to maintain high MLVSS, the energy input and the air flow rate are major parameters oxygen transfer rate in JLR. Finally, the final nonlinear regression model had been developed as a function of E/V, Qg, and μc.
박상민 ( Sang Min Park ),전항배 ( Hang Bae Jun ),배종훈 ( Jong Hun Bae ),박우균 ( Woo Kyun Park ),박노백 ( Noh Back Park ) 한국환경농학회 2010 한국환경농학회지 Vol.29 No.3
The objective of this study was to investigate a small sewage treatment system. This system was developed to improve a nitrogen and phosphorus removal efficiency and generate less solid using upflow septic tank(UST)-aerobic filter(AF) system. The UST equipped with an aerobic filter, the filter was fed with both raw sewage and recycled effluent from the UST to induce the denitrification and solid reduction simultaneously. Overall removal efficiencies of COD and total nitrogen(TN) were above 96% and 73% at recycle ratio of 200%, respectively. Critical coagulant dose without the biochemical activity was found to be 40 mg/L. Removal efficiency of total phosphorus(TP) in influent was above 90% by chemical and biological reactions. Although the phosphorus concentration was low under the high alkalinity in raw sewage, the pH value was unchanged by the coagulant dose.
전처리된 하수슬러지와 유기성폐기물의 통합소화를 위한 최적 혼합비율 연구
변병수 ( Byoung Su Byun ),이준상 ( Jun Sng Lee ),배종훈 ( Jong Hun Bae ),송용호 ( Yonh Hyo Song ),전항배 ( Jun Hang Bae ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.5
In this study, anaerobic co-digestion experiments for mixtures consisting of pre-treatment sewage sludge, food waste and livestock manure conducted to assess the methane yields and the volatile solids (VS) removal rates. simplex centroid design(SCD) was employed to design the mixing rate of organic wastes for the anaerobic co-digestion. presents the results of ANOVA conducted to assess the models of the cumulative methane yield and VS removal rates. The p-values verified the suitability of the model, where the model shows significance since the null hypothesis proves wrong if the p-value is less than 0.05. Three models-the linear, quadratic, and special cubic models-were considered. The p-values of the linear model were 0.012 (for cumulative methane yield) and 0.05 (for VS removal rate), which were both. From the regression analysis, co-digestion with sewage sludge, food waste, and livestock manure resulted a good synergy effect for accumulated methane production and VS decomposition rate. It was observed that incidence rate of sewage sludge was 61.7% and higher the mixing ratio of sewage sludge brought the better result. The optimal mixing ratio of sewage sludge, food waste, and livestock manure was found to be 61.3%, 28.6%, 10.1% as respectively.
이준상 ( Jun Sng Lee ),변병수 ( Byoung Su Byun ),배종훈 ( Jong Hun Bae ),이범 ( Yonh Hyo Song ),전항배 ( Hang Bae Jun ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.5
During denitrification volatile fatty acid was expected to be used as a carbon source, when NO3- was added into the methanogenic phase where glucose and volatile fatty acid were accumulated. In this study the effect of the addition of NO3- on the production of methane was investigated. Nitrogen oxides (NOx) were found to inhibit the methane production, however the process of denitrification and methane production occurred simultaneously. In addition if only NO3- and NO2- were co-existed, the process of methane production was discontinued. And when glucose and volatile fatty acid were compared as carbon substrate, there was significantly different only among the rates of decomposition of COD (organic matters) and NO3- and the production of methane. It has been observed that methanogenesis was progressed only after NO3--N was completely decomposed. Also as higher the concentration of NO3- was added, more organic matters were used for denitrification and it resulted the inhibition of methane production. In other words, at the initial stage of denitrification, the activity of denitrifying bacteria was dominant, however once NO3- was completely decomposed or once the denitrification was completed the methanogenic bacteria was appeared to be activated and overall the activity of denitrifying bacteria was dominant over the methanogenic bacteria.