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고도정수처리공정별 암모니아와 용존성 유기물질에 대한 염소요구량의 변화에 관한 연구
구이경,황덕흥,이상봉,김동윤 ( Lee Kyoung Ku,Deok Heung Hwang,Sang Bong Lee,Dong Youn Kim ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.4
Since 20th century began, chlorine has been used as a primary disinfectant for the water treatment. But it was suggested that disinfection by chlorine should be modified because the undesirable disinfection byproduct such as THMs had been found in drinking water. And so this study was carried out to understand the characteristics of chlorine demand variation through the water treatment process. Investigated results from this study were as following. The short term and the total chlorine demand during research period in Nakdong river, varied over the range of 3.09∼6.69 and 4.78∼9.78㎎/ℓ, respectively. The total chlorine demand was reduced about 80% after BAC filtration. Because NH₃-N reacted with chlorine rapidly, this reaction influenced the short term chlorine demand and the mean correlation coefficient was 0.99. The relationship between chlorine demand and NBDOC among DOC portion showed low correlation coefficient of 0.24, but that between chlorine demand and BDOC showed high correlationship. The correlation coefficients of 4hr, 72hr and 168hr were 0.77, 0.88 and 0.87, respectively.
낙동강 수계에 대한 정수처리공정에서 응집공정의 DOC 제거 특성
황덕흥,김동윤 대한상하수도학회 1999 상하수도학회지 Vol.13 No.2
This study was carried out to derive the removal characteristics of target matcri-als(DOC and turbidity) during the coagulation process after the injection of coagu-lants(PACI and FeC13). Used apparatus were a jar teat and a pilot plant. A great por-tion of DOC among the total removed DOC was achieved at the slow mixing process among the coagulation process. The ranges of removed DOC and optimum pH for each coagulant were 0.45~1.47mg/∫ and 5.0~5.5 by FeC13+ respectively. Both of coagulants showed little increase of DOC removal above coagulant dosage 20mg/∫ Molecular weight distribution(MWD) of removed DOC was measured by gel filtration(GF) technique. The MWD variation by gel filtrationin(GF) for removed DOC in the coagulation process were as follows; for raw water, the percentages of each MWD for total area were < MW 6,500 25.5%, MW 6,500~66,000 67.1%, and > MW 66,000 7.4%. For the same coagulant dosage(12mg/∫), the percentages of each MWD for total area by PACI were <MW 6,500 20.5%, MW 6,500~66,000 occurred a little, but at a part of <MW 6,500, the removal by FeC13 was superior about 2.5 times to that by PACI.