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정수처리공정시 Ozone Mass Transfer 및 적용에 관한 연구
김동윤,윤정효,임정아,유정아 부산대학교 환경문제연구소 1996 環境硏究報 Vol.14 No.1
The mass transfer was known that a residual ozone was changed to proportion by the ozone dosages. The mass transfer coefficients of ozone calculated for slope of relationships ozone dosage versus residual ozone concentrations. The relationship of ozone utility rate versus slope of its was known to unproportions. A residual ozone could control by the ozone dosages about water qualities and could inlet to ozone of optimum in the reactors. The relationship of organics and reactions of ozone changed by the condition of water qualifies and estimations of organics in a drinking water at the water work systems would be BDOC. The equation of relationships ozone dosages versus increasing BDOC is following: BDOC = BDOC_o + 0.105Cd^0.52
THM 형성 영향인자에 의한 THM 농도예측 및 고도정수처리 공정에의 적용
김동윤,임정아,윤정효,박선호 대한상하수도학회 1997 상하수도학회지 Vol.11 No.4
Trihalomethanes (THMs) are formed during the chlorination of waters containing precusors compounds, most commonly humic substances, changes in pH, TOC, temperature, precusor source and concentration chlorine dosage, bromide level and reaction time directly influence trihalomethane formation potential (THMFP) and kinetics. A standard THMFP experiment was conducted for each water under the following conditions; 20℃, pH 7.4, reaction time of 48hr, TOC 5.7mgC/L. A series of kinetic experiments was conducted for each water to provide THM formation under varying conducted for each water to provide THM formation under varying conditions of reaction time, pH, temperature and TOC, chlorine dosage. The resultant multiple parameter powre function predicts a THM which allows direct calculation of THM, is [THM] = 0.00039(pH-2.81)[TOC][Cl_2]^0.321 t^0.266 T^0.286 Characteristics of raw water in advanced drinking water treatment pilot plant were, TOC levels ranged from 4.42~6.84mgC/L, pH 7.2~7.8, temperature 7.0~18.4℃, UV-254 absorbance 0.057~0.85cm^-1, THM levels ranged from 0.031~0.049mgC/L.
응집 , 침전 공정에서 PAC 를 이용한 낙동강 원수의 DOC 제거 및 분자량 분포 특성
김은희,김동윤,임정아,윤정효,김영탁 대한상하수도학회 1999 상하수도학회지 Vol.13 No.1
The objective of present work is to evaluate the optimum coagulation conditions in order to decrease dissolved organic carbon(DOC) and turbidity at different polyaluminum chloride dosage and pH from Nakdong River water. This studies were carried out to examine distribution on apparent molecular weight(AMW) of DOC in the Nakdong River water and its coagulation-sedimentation water. On the basis of jar tests, at the optimum coagulation pH in order to decrease DOC and turbidity were pH 5.0~6.0 and optimum dosage of polyaluminum chloride were 10~15mg Al_2O_3/L. The removal percentage of DOC and UV-254 absorbance were 35~40%, 45~60%, respectively. In pilot plant, at the optimum coagulation pH in order to decrease DOC and turbidity were 5.0-6.5, and the removal percentage of DOC were 30~45%. Distributions of AMW in the Nakdong River, less than 6,800dalton were 60.7% 6,800~11,000dalton were 32.8%, more than 11,000dalton were 6.4%. When the polyaluminum chloride dosage was 12~20mg/L, the removal percentages of each AMW for AMW of Nakdong River water, less than 6,800dalton were 25~28%, 6,800~11m999dalton were 65~68% more than 11,000dalton were 10~60%.