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A<sup>2</sup>/O공정과 수정 Phostrip공정과의 질소 및 인제거 특성비교
김광수,김이태,Kim, Kwang-Soo,Kim, I-Tai 한국물환경학회 2005 한국물환경학회지 Vol.21 No.6
An experimental study for the comparison of nitrogen and phosphorus removal efficiencies between $A^2/O$ and modified Phostrip (M-Phostrip process) were carried out with bench-scale reactors. In case of nitrogen removal efficiencies both of processes showed similar ones when influent organic loadings were high. However, M-phostrip process was more effective than $A^2/O$ at low organic loadings. This is why M-phostrip process consumes the whole mass of influent organics as a carbon sources for denitrification in anoxic reactor but the anoxic reactor of $A^2/O$ process utilizes the residual carbon followed by consumming a part of influent carbon for phosphorus release in anaerobic reactor. $A^2/O$ process required the influent COD/T-P and COD/TKN ratios were more than 56 and 10, respectively, to take place the phosphorus release in anaerobic process and phosphorus uptake in oxic process. However, the luxury uptake of phosphorus in M-phostrip process was not affected by influent COD/T-P and COD/TKN ratios and the adverse effect of nitrate in return sludge introduced to the p-stripper from the 2nd clarifier was not significant due to the configurational advantage of the p-stripper.
하수처리장 혐기성 소화조에서 열회수를 위한 열저장능력을 가진 상전이 물질의 열흡수 및 방출 특성
김광수 ( Kwang Soo Kim ),전태환 ( Tae Hwan Jun ),박정오 ( Jung O Park ),김이태 ( I Tai Kim ) 한국수처리학회 2011 한국수처리학회지 Vol.19 No.6
The use of latent heat storage system using phase change materials(PCMs) is an effective way of storing thermal energy and has the advantage of high-energy storage density. To know the thermal properties of PCMs around room temperatues this study was investigaed on polyethylene glycol(PEG), fatty acids and hydrated salts as PCMs for for heat recovery from anaerobic digester of Sewage Treatment Plant. The experiments were carried out with bench scale device which consisted of cylinder glass tubes of 20ml, no insulation of their bottom parts for heat transfer, putting insulation round the their rest parts. To study heat absorption at hot conditions, the tubes contained PCMs were kept on the temperature of 10℃ and then moved to the temperature of 50℃. To study heat release at cooling conditions, the tubes contained PCMs were kept on 50℃ and then moved to the temperature of 10℃. The experimental results of heat absorption and release of PCMs are as follows. In case of PEG the more molecular weight is high, the more the heat storage in hot conditions and heat release in cooling conditions showed clearly. In fatty acids, performing with the caprilic acid and glycerine matters, the caprilic acid was observed heat storage and release very perfectly but the glycerine did not. In hydrated inorganic salts, the Glauber`s salt(Na2SO4·10H2O) and Zn(NO3)·6H2O, with high hydrate molecular weight were very attractive for thermal storage and release but CH3COONa·3H2O with low hydrate molecular weight did not show the thermal properties of heat storage and release.