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SBR 공정의 무산소조건에서 질산염농도에 따른 생물학적 인의 방출 및 흡수 특성
김이태 ( I Tae Kim ),이희자 ( Hee Ja Lee ),김광수 ( Kwang Soo Kim ),배우근 ( Woo Keun Bae ) 한국수처리학회 2004 한국수처리학회지 Vol.12 No.2
N/A Since SBR(Sequencing batch reactor) process, which is a compact biological nutrient process, utilizes influent organic materials as an external carbon source for phosphate and nitrate removal. In this study, a bench scale experiment was carried out for SBR process to investigate simultaneous phosphate and nitrate removal in anoxic condition at various F/M ratios in the range of 0.12~0.44 kg COD/kg MLSS·d. The phosphorus release and excess uptake in anoxic condition were obviously observed at F/M ratios of 0.12~0.44 kg COD/kg MLSS·d. Phosphorus release and uptake in anoxic condition had significantly high correlation with organic material and nitrate concentration. The phosphorus release and uptake was enhanced as the F/M ratio of anoxic phase increase. Specific denitrification rate had significantly high correlation with F/M ratio of the anoxic phase too. The rate of phosphorus release and uptake in the anoxic condition were 0.08~0.94 kg S-P/kg MLSS·d and 0.012~0.1 kg S-P/kg MLSS·d, respectively.
김이태 ( Kim I Tae ),서재승 ( Seo Jae Seung ),이동률 ( Lee Dong Lyul ) 한국물환경학회 2003 한국물환경학회지 Vol.19 No.4
Although the urban water demand per capita per day (lpcd) had an increased trend Until mid-l990s, since then it has become reducer and stable In this paper, the urban water demand divided into domestic water and others. which is business, commercial. public bath, and industrial water demand in city This paper evaluates the characteristics of urban water demand use and trend, and forecasts long-term demand considering the recent character with two exponential models Modified exponential model (Model 1) and least square method exponential model (Model 2) applied to the whole country and five cities The results of two models show that urban water demand is predicted to approach to stable level in 2011 year The forecasting of domestic water demand gives better results compared with that of other water demand in evaluation to mean absolute percentage error of both models
SBR공정에서 전자수용체에 따른 호기성 입상활성슬러지의 공정별 특성
김이태 ( I Tae Kim ),이희자 ( Hee Ja Lee ),배우근 ( Woo Keun Bae ) 한국물환경학회 2004 한국물환경학회지 Vol.20 No.5
This study was conducted to find the effect of electron acceptors on the formation of granular sludge by using four different types of electron acceptors. The phosphorous uptake, denitrification, and sulfate reduction in anoxic modes were simultaneously occured because of the presence of the polyphosphate accumultating organism(PAO) that utilize nitrate and sulfate as an electron acceptor in the anoxic zone. Denitrifying phosphorous removal bacteria(DPB) was enriched under anaerobic/anoxic/aerobic condition with a nitrate as an electron acceptor, and desulfating phosphorous removal bacteria(DSPB) was enriched under anaerobic/anoxic/aerobic condition with a sulfate as an electron acceptor. Polyphosphate accumulating organism(PAO) were enriched in the anaerobic/aerobic SBR. PAO took up acetate faster than DPB and DSPB during the aerobic phase. The sludge with nitrate and sulfate as an electron acceptors grew as a granules which possessed high activity and good settleability. In the anaerobic/aerobic modes, typical floccular growth was observed. In the result of bench-scale experiment, simultaneous reactions of phosphorus uptake, denitrification and sulfate reduction were observed under anoxic condition with nitrate and sulfate as an electron acceptors. These results demonstrated that the anaerobic/anoxic modes with nitrate and sulfate as an electron acceptors played an important role in the formation of the sludge granulation.