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김지훈,김형수,염익태,한기봉 대한상하수도학회 2003 상하수도학회지 Vol.17 No.1
In this study, results of a microfiltration(MF) pilot plant are presented based on 6 months on-site experience. Performance evaluation of the hollow fiber membrane system was focused on two criterions: (i) permeated flux and operation time (ii) treated water quality. The pilot plant was operated in dead-end filtration mode under a constant flux. A module of hollow fiber membranes(polyethylene, nominal pore size: 0.1㎛) was used in this experiment. 15LMH(ℓ/㎡ · hr) operation kept much longer operation time compared with 30 LMH(ℓ/㎡ · hr) operation. After about four months of 15LMH operation, increase of suction pressure were less than 15cmHg and the membrane fouling was not serious. Overall, the results of this study demonstrated that 15LMH operation was a more effective and stable process than 30LMH operation for drinking water treatment.
장은수,최영균,김형수,염익태 대한상하수도학회 2003 상하수도학회지 Vol.17 No.5
Effects of alkaline, ozone, and combination of alkaline and ozone pretreatments on the biodegradability of sewage sludge were investigated. Solubilization efficiency in terms of SCOD production was higher in the order of the sludge treated with both alkali and ozone, alkali, ozone. Alkaline pretreatment was performed at pH 12 for 3hr and ozone dosage was 0.02 or 0.05 gO₃/gSS. When the sludge was treated with ozone without alkali addition, the solubilization efficiency increased with the ozone dosage. Batch tests were conducted using activated sludge as a seed and pretreated sludge as a feed. The highest biodegradability could be obtained when the sludge was treated with both alkali and ozone. Biodegradability of the pretreated sludge showed linear relationship with the solubilization efficiency, suggesting that the solubilization efficiency be a useful index to evaluate the biodegradability of the pretreated sludge. Production of carbon dioxide during the batch tests also indicated that the alkaline followed by ozone pretreatment showed the highest efficiency for the biodegradability of the sludge.
권재현,김봉준,김민규,염익태,김형수 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4
The pretreatment process was carried out to solubilize the sewage sludge for enhancing its biodegradability using alkaline treatment, ultrasonic treatment(l5kHz), ozone treatment and different combination of these three methods: alkaline followed by ultrasonic as well as ozone, and ultrasonic followed by alkaline. The solubilization efficiency was evaluated based on the SCOD/TCOD ratio and VSS/TS ratio. In results, the proper condition of alkaline treatment was shown as 30meq/l of NaOH, pH 12 and 3hours of reaction time. Solubilization efficiency increased to 17% from initial 2% based on SCOD/TCOD ratio under this condition. In ultrasonic treatment, the higher ultrasonic power, the longer treatment time and the lower sludge volume resulted in higher solubilization respectively. There was a rapid increase in solubilization efficiency after 20 minute, then it was measured as 32% of SCOD/TCOD ratio in 1 hour at a ultrasonic power of 1,300W with 1/sludge. Solubilization efficiencies in combined treatment using alkaline and ultrasonic were 47-53% higher than single treatment at a sonicated time of 1 hour. Ozone treatment followed by alkaline treatment also represented the enhanced solubilization compared to ozone treatment. Therefore, ultrasonic or ozone treatment assisted by alkaline could achieve the short treatment time as well as high solubilizetion efficiency.
권재현,류성호,박기영,안규홍,염익태,이용훈 대한상하수도학회 2002 상하수도학회지 Vol.16 No.2
The effects of ozone treatment on the dewaterability of activated sludge wasted from a sewage treatment plant were investigated in this study. Following ozone treatment, sludge was dewatered using a pressure fitter. The sludge filterability evaluated by SRF deteriorated with ozone dosage at relatively low ozone doses due to sludge solubilization and particle size decrease. However, at ozone doses higher than 0.6gO_3/gSS, the SRF of the ozone treated sludge became comparable with the value for the sludge without ozone treatment. It is suggested that the oxidation of the viscous, high molecule organics attached at cell surface reduces the surface charge of sludge particle and promotes flocculation at relatively high ozone doses. Ozone treatment also cause the release of bound water trapped inside cells or flocs, resulting in significant reduction of cake water content after dewatering. In terms of cake volume, more than 70% reduction was obtained at 0.6gO_3/gSS. These observations suggest that ozone treatment has potential to significantly enhance sludge dewaterability and to produce a more compact cake without severe deterioration of its filterability.
업종별 산업폐수중 수질오염물질 배출 특성 및 개연성 평가 연구
안태웅(Tae Ung Ahn),김원기(Won Ky Kim),손대희(Dae Hee Son),염익태(Ick Tae Yeom),김재훈(Jae Hoon Kim),유순주(Soon Ju Yu) 大韓環境工學會 2016 대한환경공학회지 Vol.38 No.1
업종별 수질오염물질 배출 목록은 산업폐수 배출시설을 인허가할 때, 해당 시설 또는 업종에서 관리해야 하는 배출가능한 수질오염물질을 정확히 검토하기 위함은 물론이고, 오염방지시설의 설계에도 필수적인 가장 기초적인 자료이다. 본 연구에서는 우리나라 폐수배출시설 3개 업종을 대상으로 수질오염물질 배출목록을 작성하기 위하여 해당 사업장의 일반현황 및 처리시설 운영 등에 대한 기초자료 수집과 해당 사업장에서 배출하고 있는 산업폐수중 특정수질유해물질을 비롯한 수질오염물질에 대한 수질 분석을 수행하였다. 본 연구의 조사대상 업종별 수질오염물질 배출목록을 확정하기 위해서 정상적인 시설운영 과정에서 해당물질이 폐수중으로 실제 배출될 수 있는 개연성을 확인하였다. 이를 위해, 먼저 원폐수 및 최종배출수의 시료 분석에서 검출된 모든 수질오염물질을 평가대상으로 하고, 검출되지 않은 물질은 대상에서 제외한다. 다음으로 이들 평가대상 수질오염물질에 대하여 제조공정상에서 사용하는 각종 원료, 부원료, 불순물 등에서 포함될 가능성을 확인하고, 여기에서 확인될 경우 수질오염물질 배출목록으로 확정한다. 본 연구에서는 3개 업종을 대상으로 하였으며, 석유화학계 기초화합물 제조시설은 조사대상 물질 42종 중 특정수질유해물질 16종을 포함한 31종, 기타 기초유기화합물 제조시설은 특정수질유해물질 14종을 포함한 30종, 화력발전시설은 특정수질유해물질 8종을 포함한 20종의 수질오염물질이 배출목록으로 확정되었다. 본 연구에서는 수질분석과 개연성 평가를 통해 보다 객관적이고 타당성 있는 업종별 수질오염물질 배출목록을 작성하였다. Information on the lists of pollutants from industrial wastewater discharge are essential not only to specify the key pollutants to be managed in permission process but to design the treatment facilities by the dischargers. In this study, wastewater quality analysis was conducted for three industrial categories including the specified hazardous water pollutants. The general description of the wastewater occurrence, major sources, treatment facilities are also investigated to obtain integrated database on the pollutant inventories for the industrial categories. In addition Based on the analysis of raw wastewater and final effluent, the detected pollutant items are confirmed by analyzing their presence in the raw or supplement materials, the potential of formation as byproducts, and the possibility of inclusion as impurities. The three industrial categories include petrochemical basic compounds, basic organic compounds, and thermal power generation. The water pollutants emitted from petrochemical basic compound manufacturing facilities are 31 items including 16 specified hazardous water pollutants. Basic organic compound manufacturing facilities discharge 30 kinds of pollutants including 14 specified hazardous water pollutants. Thermal power generation facilities emit 20 pollutants, 8 specified hazardous water pollutants among them. These substances were decided as emission inventories of water pollutants finally through the probability evaluation. The compounds detected for each categories are screened through investigation on the possible causes of their occurrence and confirmed as the final water pollutant inventories.