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Pilot-scale Study on Nitrogen Removal of Effluent from Biogas Plant
유성인(Yoo, Sungin),유영섭(Yu, Youngseob),이용세(Lee, Yongsei),박현수(Park, Hyunsu),유희찬(Yoo, Heechan) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.11
A rotating activated bacillus contactor (RABC) process with a series of aerobic reactors was tested in pilot scale to treat digested liquid from an anaerobic digester treating swine wastewater and sewage sludge. The influent (digested liquid) for the RABC process showed C/N ratios less than 2 as a typical feature of effluent from anaerobic digesters. The pilot process, which consists of three 3 RABC reactors, four aerobic tanks and a sedimentation tank, was operated for 210 days with a hydraulic retention time of 20 days without pH and temperature control. Since the Bacillus-enriched aerobic reactors shows high efficiencies of nitrogen removal at low DO levels less than 1.0 mg/L, they were operated at reduced aeration intensities. With relatively low concentrations of organics in comparison with nitrogen concentrations, the RABC process tested in this study showed stable and high nitrogen and organics removal efficiencies over 80%. The nitrogen removal process tested in this study was proven to be an effective and operation-cost saving (lower aeration) method to remove nitrogen without adding external carbon sources to meet the optimum C/N ratio.
남한강 실측자와의 통계적 비교를 근거로 한 수질예측모형의 적용성 평가
오경미,조순행,유희찬 ( Kyoung Mee Oh,Soon Haing Cho,Hee Chan Yoo ) 한국물환경학회 1995 한국물환경학회지 Vol.11 No.4
The purpose of this study is to investigate the applicability of water quality models which are commonly used for evaluation and prediction of water quality of stream and rivers in Korea. Three models, QUAL2E, WASP4 and STREAM, were used for comparison. Three different statistical methods were used to test the correlation between predicted results by model and field measurements. Field data were obtained from the south branch of Han River in between Chungju and Yangpyung. Parameters used for model comparison were DO, BOD, NH₃-N, NO₃-N, Org-P and Dis-P. The data predicted by QUAL2E generally showed better fit to the field data. However, this model can not predict the effect of highly polluted stream. Nitrogen and phosphorus data predicted by WASP4 were closer to the field data than those data predicted by other models, even though more input data were required to run WASP4. The main features of STREAM are ; 1) it can predict the change of DO concentration by bottom rooted plant and by denitrification. 2) it can be applied to predict the water quality of small stream rather than large river. From this study, it was found that all three models showed poor ability in predicting water quality change caused by nonpoint discharge.
유류로 오염된 토양 복원을 위한 토양가스추출 및 세척공정의 현장적용 연구
고석오,권수열,유희찬,강희만,이주광,Ko. Seok-Oh,Kwon. Soo-Youl,Yoo. Hee-Chan,Kang. Hee-Man,Lee. Ju-Goang 한국방재학회 2001 한국방재학회논문집 Vol.1 No.3
현재 운영중인 주유소를 대상으로 토양 및 지하수 오염 정도를 조사하였고 오염물 제거를 위한 물리 화학적 복원기술 적용성에 대한 연구를 실시하였다. 현장의 토양이나 지하수는 국지적으로 차이가 있었으나 토양오염 대책기준을 초과하여 토양층에 유동성 (Free Liquid) 상태의 유류가 존재할 정도로 상당히 오염되어 있다는 것을 확인하였다. 유류 오염 토양에 pilot scale 규모의 토양세척법과 토양가스추출법 (SVE)을 설치하여 운전하였다. 토양세척법의 경우 계면활성제인 Tween80 용액을 주입 한 후 하부에서 추출된 유출수내의 오염물질의 농도를 측정한 결과 용해도 증가에 의하여 TPH 농도의 증가는 약 10배에 이르는 것으로 조사되었으나 유류 유동성의 증가는 관측되지 않았다. SVE법의 경우 추출 1일 경과 후 BTEX와 TPH에 대하여 각각 4kg/day 및 90 kg/day의 최대 제거효율을 보였으며 추출이 지속됨에 따라 제거율이 감소하였다. SVE공정의 효과적 운영을 위하여는 지하수위의 높이에 대한 고려와 오염물의 휘발화 (volatilization)와 추출속도의 평형화를 위한 조절이 필요할 것으로 판단된다. Field investigations for subsurface soil and groundwater at a gas station showed that the site was severely contaminated and even petroleum compounds as free liquid state were observed. Pilot-scale soil flushing and soil vapor extraction process(SVE) were applied to evaluate the effectiveness of pollutants removal. Surfactant solution, Tween 80, was used to enhance the solubility of petroleum compounds and resulted in about 10 times increase on TPH(Total Petroleum Hydrocarbon) concentration. As for SVE method, maximum concentration of TPH and BTEX reached within 24 hours of extraction and then continuously decreased. Considerations on the groundwater level and the kinetic limitation for volatilization of contaminants have to be taken into account for the effective application of SVE process.