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RISS 인기검색어
- 검색키워드
- 저자 : Daewon Pak (검색결과 53 건)
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Color Removal with Low Temperature Catalytic Oxidation
Pak, Daewon,Chang, Wonseok,Chung, Yunchul 嶺南大學校 環境問題硏究所 1998 環境硏究 Vol.18 No.1
Novel oxidation technology to decolorize dye wastewater is discussed and the feasibility of color removal with Fe/MgO catalyst fluidizing in a reactor under continuous flow is demonstrated at room temperature. In batch tests, the oxidation reaction of reactive and disperse dye with oxidizing agent, hydrogen peroxide, in the presence of Fe/MgO catalyst is performed. Through the catalytic oxidation, dyes are oxidized to molecules with lower molecular weight and then mineralized based on TOC analysis. The influence of hydrogen peroxide and catalyst dosage on the catalytic oxidation rate is verified. The catalytic oxidation rate increases with increasing hydrogen peroxide and catalyst dosage. Fe/MgO catalyst fluidizing in the reactor operated at room temperature was tested to decolorize the wastewater from a dye manufacturing industry. In the fluidized bed reactor, the wastewater was completely decolorized and about 30% of COD removal was obtained during 30 days of operation. Organic matters were degraded and part of them mineralized by catalytic oxidation. BOD/COD ratio of the effluent from the fluidized bed reactor was increased with compared to that of the influent. After 30 days of operation, the effluent from the fluidized bed reactor started becoming yellowish. COD and residual hydrogen peroxide concentration in the effluent started to increase due to the catalyst losing its activity.
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PHOSPHOROUS REMOVAL BY TWO-BIOFILTER SYSTEM
Pak, Daewon,Chang, Wonseok,Chung, Yunchul 嶺南大學校 環境問題硏究所 1999 環境硏究 Vol.19 No.1
ABSTRACT Two-biofilter system operated under altemate condition of anaerobic/aerobic was tested to remove nutrient as well as organics from wastewater generated from carwashing facility. The wasterwater was chracterized by relatively low organic and high phosphorous content. The factors affecting phosphorous removal in the two biological filter system were investigated. Operational parameters examined in this study were hydraulic retention time, organic, suspended solid and nitrogen loading rate. The factors affecting phosphorous removal in biological filter appeared to be influent COD, COD/T-P, BOD/COD, mitrogen, and SS/T-P. Nitrite and nitrate produced in the biofilter in acrobic condition affected phosphorous removal by the two biofilter system. The biomass wasted during backwash procedure also affected total phosphorous removal by the system. Two-biofilter system operated under alternate condition of anaerobic/aerobic was tested to remove nutrient as well as organics from wastewater generated from car-washing facility. The wastewater was characterized by relatively low organic and high phosphorous content. The factors affecting phosphorous removal in the two biological filter system were investigated. Operational parameters examined in this study were hydraulic retention time, organic, suspended solid and nitrogen loading rate. The factors affecting phosphorous removal in biological filter appeared to be influent COD, COD/T-P, BOD/COD, nitrogen, and SS/T-P. Nitrite and nitrate produced in the biofilter in aerobic condition affected phosphorous removal by the two biofilter system. The biomass wasted during backwash procedure also affected total phosphorous removal by the system.
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PESTICIDE WASTEWATER TREATMENT USING ELECTROCHEMICAL OXIDATION
Pak, Daewon,Chung, Dowon,Chung, Yunchul 영남대학교 환경문제연구소 2000 環境硏究 Vol.20 No.1
Electrochemical treatment of wastewater generated from the production of chemicals used to make insecticide, herbicide, and pesticide is investigated. IrO2/SnO2 film electrode prepared on titanium was used as an anode in the electrochemical cell. Based on TOC data obtained from the batch test, organic compounds in the wastewater was oxidized and mineralized. Some organic compounds did not undergo electrochemical oxidation. In order to identify those compounds, gel permeation chromatogram and GC/MS analysis was made. Factors that determine electrochemical oxidation rate were investigated. TOC removal rate was strongly affected by current density. Eleotrochemical oxidation rate was not improved under acidic condition. Continuous test was performed to investigate preliminary design parameter for electrochemical cell.
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장원석,박대원 서울産業大學校 2005 논문집 Vol.54 No.4
본 연구는 고부하 하천·호소에 대해 고효율·고속으로 처리할 수 있고 유량변동에 충분히 대처 가능한 콤팩트한 처리시스템에 관한 것이다. 연구결과로 기존정화법의 처리한계(BOD=20-30㎎/L)보다 10배 이상의 부하에서도 높은 처리효율(COD제거율 83%, SS제거율 :95%, 총인 제거율:98%, 색도 제거율:92%)을 보이며 빠르게(15분-30분) 처리하고, 콤팩트한 시스템(기본의 1/5공간소요)으로 처리비용을 줄일 수 있는 것으로 나타났다. 또한 폐기되는 제철슬래그를 특수가공한 수처리제로 처리를 행함으로 자원을 재활용하고 더 나아가 고부가가치 상품으로 활용할 수 있는 시스템이다.
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개발도상국 매립가스 CDM 등록사업의 예상실적과 감축실적 분석
유승민(Seungmin Ryu),박대원(Daewon Pak) 유기성자원학회 2021 유기물자원화 Vol.29 No.2
2015년 채택된 파리협정으로 2023년부터 탄소감축 이행여부를 점검함에 따라, 메탄가스 발생의 11%를 차지하고 있는 폐기물로부터 배출되는 온실가스 관리는 매우 중요하고 시급한 실정이다. 그럼에도 불구하고, 93%의 폐기물이 비위생적으로 매립되고 있는 개발도상국에서의 매립가스 관리는 여전히 도전적인 과제이다. 이에 CDM 사업을 활용하여 경제적으로 지속가능한 매립가스 자원화 사업이 다시 주목을 받고 있으며, 다양한 개발도상국의 매립장에서 매립가스 발생량과 온실가스 감축량을 산정하기 위한 연구가 활발히 진행되고 있다. 그러나 연구방법에 따라 예측된 수치와 CDM 사업으로 등록된 이후 모니터링을 통한 실측치 간에는 상당한 차이를 보이고 있으며, 차이가 발생한 원인에 대한 연구는 수행된 사례가 없었다. 이에 본 연구에서는 현재까지 UNFCCC에 등록된 매립가스 CDM 등록사업 46건 중 모니터링 을 수행한 사업 18건의 매립가스 프로젝트를 분석하였으며, 연구결과 강우량(28%), 설비고장(22%), 유기성분 함량(11%), 매립물량(11%), 매립지내 온도(11%) 등이 예측치와 실측치 간의 차이를 유발하는 주요 원인임을 확인할 수 있었다. As the implementation of carbon reduction measures would be monitored starting from 2023 in line with the Paris Agreement, it is crucial and urgent to control GHGs emitted from wastes contributing to 11% of methane emissions. Despite such importance and urgency, 93% of wastes are deposited in unsanitary landfills in developing countries, presenting challenges to methane management. Against the backdrop, landfill gas-to-energy projects have once again drawn attention for their economic substantiality secured through CDM projects while there has been much research actively carried out to estimate methane emissions and GHG reductions in landfills located in developing countries. Although a signifiant difference was found between estimations calculated based on research methodologies and actual results monitored through registered CDM projects, there has not been a study conducted on what is causing such a difference. Accordingly, the research team conducted an analysis of 18 LFG projects out of 46 that were registered as LFG CDM projects under the UNFCCC and has identified precipitation(28%), malfunction(22%), organic content(11%), amount of landfilled waste(11%) and temperature(11%) as key parameters causing the difference between the amount of methane captured and the amount of GHG reduced.
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