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기존 활성슬러지 공법의 오일폐수 처리특성 향상을 위한 한외여과막의 조합에 관한 연구
이택순(Taek Soon Lee),서규태(Gyu Tae Seo),문병헌(Byung Hyun Moon),최광수(Kwang Soo Choi) 한국수처리학회 1997 한국수처리학회지 Vol.5 No.4
This paper focuses on enhancing an existing physico-chemical process followed by activated sludge process for treatment of oily wastewater from metal processing work in an automobile manufacturing plant. A hybrid membrane separation activated sludge system was investigated in this study as an alternative for stable treatment of the oily wastewater. From the biodegradability test, it was shown that dissolved organic matter in the wastewater could be effectively removed by biological process. SCODcr Removal efficiency was higher than 90% at more than 10 days HRT(SRT) and 75∼80% removal of N-hexane for oil substance. However, during the experiment, settling characteristic of biomass was deteriorated by extended retation time. Organic rejection by ultrafiltration membrane with MWCO 20,000 was around 15% in terms of SCODcr showing that the oily wastewater contains almost soluble organic matters with molecular weight less than 20,000. However the hybrid membrane separation activated sludge system could produce significantly high removal efficiency of more than 95% in treatment of the oily wastewater from both one stage and two stage chemical treatment. Consequently this membrane coupled activated sludge system could be obviously a stable alternative process of conventional physico-chemical and biological treatment.
경상남도의 효율적 빗물관리를 위한 GIS 기반 물순환 체계 분석
이택순 ( Taek Soon Lee ),송봉근 ( Bong Geun Song ),한치복 ( Chi Bok Han ),박경훈 ( Kyung Hun Park ) 한국지리정보학회 2011 한국지리정보학회지 Vol.14 No.2
본 연구는 경상남도의 효율적인 빗물관리를 위해서 강우량, 증발산량, 표면유출량의 물순환 체계를 GIS 기반으로 분석하였다. 공간내삽법에 의한 강우량(1999~2008) 분포는 경상남도 남서부 해안지역의 하동군, 산청군, 사천시 등이 중동부 내륙지역의 창녕군, 밀양시, 창원시 등보다 많게 나타났다. 증발산량은 기온, 토지이용, 식생지수를 독립변수로 한 추정식으로 산출하였으며, 남해군이 평균 93.71mm로 가장 많았고, 진해시와 창원시가 각각 81.78mm와 84.37mm로 가장 적었다. 표면유출량은 SCS 수문학적 토양분류와 토지이용에 의한 산정식으로 분석하였으며, 하동군이 90.40mm로 가장 많았고, 거창군이 46.69mm로 가장 적게 나타났다. 이상의 GIS기반 물순환체계 분석결과는 경상남도의 효율적인 빗물관리를 위한 계획 및 정책마련의 기초자료로 활용될 수 있을 것으로 사료된다. The objective of this paper is to analyze the GIS-based water cycle system: rainfall, evapotranspiration, surface run-off of Gyeongsanam-do for the effective rainwater management. The rainfall(1999~2008) analyzed by a spatial interpolation method, showed relatively higher amount in Hadong-gun, Sanchung-gun, and Sacheon-gun on the southwest coast than in Changnyeong-gun, Miryang-si, and Changwon-si in the mideast inland. The evapotranspiration was calculated by the three independent variables: air temperature, landuse, and NDVI(normalized difference vegetation index). The analysis showed that Namhae-gun had the highest evapotranspiration of 93.71mm, and Jinhae-si and Changwon-si had the lowest values of 81.78mm and 84.37mm. The surface run-off was analysed by a run-off equation based on the SCS hydrologic soil classification and landuse. The amount of surface run-off showed that Hadong-gun had the highest value, of 90.40mm, and Geochang-gun had the lowest, of 46.69mm. The analysis results of the GIS-based water cycle system will be used to support the establishment of the effective rainwater management plan in Gyeongasngnam-do.
문병현,이택순,서정윤,서희정 ( Byung Hyun Moon,Taek Soon Lee,Jeoung Yoon Seo,Hee Jung Seo ) 한국물환경학회 1997 한국물환경학회지 Vol.13 No.3
This study was conducted to use waste oyster shell as biofilm media for biological wastewater treatment. The comparison between the activated sludge and the submerged biofilm process with oyster shell media (5% of reactor volume) for domestic sewage treatment was made at various hydraulic retention times. The effluent quality of the submerged oyster shell reactor was more stable than that of activated sludge reactor. The BOD removal efficiencies of the submerged process was above 80% at the various organic loading rates of 0.12∼0.55㎏BOD/㎥/day. The COD and SS removal efficiencies of the submerged process were higher than that of the activated sludge process. Also, TKN and T-P removal efficiencies of submerged process were higher than that of the activated sludge process. The comparison between the submerged biofilm process with oyster shell media of 10% and 18% was made at various loading rates. The hydraulic retention time was fixed to 6hr. The BOD, COD_(Cr) removal efficiencies of 10% and 18% were above 80% at organic loading rates of 1.0㎏ BOD/㎥/day and 1.5㎏COD_(Cr)/㎥/day but the removal efficiencies of 18% reactor decreased as the organic loading rates were increased. The TKN removal efficiencies of 10% and 18% were above 70% at organic loading rates of 0.2㎏ TKN/㎥/day. However, the removal efficiencies of 18% reactor decreased at the higher loading rates. The phosphorus removal efficiencies of both reactors showed similar removal efficiencies.
BDD 전극과 Iridium 전극을 이용한 매립지침출수 처리의 적용에 관한 연구
박미정 ( Mi-jung Park ),이택순 ( Taek-soon Lee ) 한국수처리학회(구 한국수처리기술연구회) 2020 한국수처리학회지 Vol.28 No.3
Electrochemical water treatment is a method of controlling organic pollutants and pathogenic microorganisms in water using an electrochemical oxidation reaction. Electrochemical oxidation is divided into two processes, indirect and direct oxidation, and the purpose of this study was to compare the removal efficiency of each. Chemical oxygen demand (COD), total nitrogen (T-N), and total phosphorus (T-P) removal rates of landfill leachate with a COD of 2,936 mg/L, T-N of 1757.3 mg/L, and T-P of 168.6 mg/L were compared using indirect and direct electrochemical oxidation processes. IrO₂/Ti electrodes were used for the indirect electrochemical oxidation process, and BDD electrodes were used for the direct electrochemical oxidation process. The electrochemical oxidation processes were tested with 2 L of wastewater at a temperature of 15°C. The current density was 500 A/m², the electrode spacing was 3 mm, and electrochemical oxidation was performed for 2 hours. Comparison of the direct and indirect oxidation processes yielded a COD higher than 98%, 92% or higher for T-N, and 99.5% or higher for T-P. However, the treatment time of the direct electrochemical oxidation process was shorter than that of the indirect process. The same current was applied to both processes, which implies the direct electrochemical oxidation removal efficiency is higher than that of the indirect process.
한치복(Chi Bok Han),이택순(Taek Soon Lee) 大韓環境工學會 2010 대한환경공학회지 Vol.32 No.5
본 연구는 창원시 지역의 빗물의 계절적 수질변화와 저류조의 경과일수에 따른 수질 변화를 조사·연구하였다. 빗물의 계절적 수질 변화를 보면 전체적인 오염물질의 농도는 봄철 및 겨울철이 높았다. 내리는 빗물과 저류조 빗물의 수질을 비교 하였을 때 pH의 경우, 내리는 빗물은 pH 4.3, 저류조의 빗물은 pH 6.0을 나타내었고, 탁도의 경우는 1.82 NTU에서 14.61 NTU로 대략 8배 정도로 크게 증가하였다. 저류조의 경과 일수에 따른 수질 변화는 과망간산칼륨소비량이 초기 강우에서 먹는 물 수질기준을 초과하여 검출되었고, 증발잔류물은 초기우수에서 116mg/L 검출되었으나 저류시간 6일 경과 후부터 34일까지는 70~80mg/L로 저류시간이 길어져도 농도의 변화는 크지 않았다. This study investigated variation of rainwater quality by seasonal and storage duration of rainwater in Changwon city. Seasonally, the pollutants concentration of rainwater were higher in spring and winter. In the case of rainwater and storage rainwater quality, pH of rainwater was 4.3, storage rainwaters were 6.0 and Turbidity increased about 8 times from 1.82 NTU to 14.61 NTU. The changes of storage water quality during the storage period, initial KMnO₄ consumption rainwater was exceeded drinking water standard. Total solid in rainwater was detected as 116mg/L, it tended to stable at around 70∼80mg/L after storage period for a 6day.
연속운전 혐기성 생물 반응조에서 수소 생산에 대한 유기물부하(OLR)와 SRT의 영향
성성진 ( Seong Jin Jeong ),이택순 ( Taek Soon Lee ),서규태 ( Gyu Tae Seo ) 한국수처리학회 2014 한국수처리학회지 Vol.22 No.3
This paper focuses on the effects of organic loading rate (OLR) and solid retention time (SRT) in a continuous-operation anaerobic bioreactor. The OLR was varied from 12.4 to 49.5 g glucose/L/day without SRT control. And then the SRTs of 10 and 20 days were controlled at HRT 8 h and OLR 49.5 g glucose/L/day. The volatile fatty acids were monitored to indicate the efficiency of hydrogen gas production. From the experimental results, the increased propionic acid concentration was observed at the increased OLR without SRT control, which resulted in failing the hydrogen gas production. The hydrogen gas was not produced too at SRT 20 days and OLR 49.5 g glucose/L/day. However, at the SRT 10 days, a maximum hydrogen yield of 0.82 mol H2/mol glucose was achieved. It was estimated that the homoacetogenic reaction was predominant at an SRT of 20 days but was enfeebled at the SRT 10 days. Theoretical analysis confirmed that the OLR and the SRT should be controlled simultaneously to maintain a proper F/M ratio and then to enhance the hydrogen production during anaerobic fermentation.