http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Hun-Kyun Bae 계명대학교 자연과학연구소 2018 Quantitative Bio-Science Vol.37 No.1
In this study, two different wastewater treatment systems, a conventional activated sludge process and pure oxygen activated sludge process, used at a municipal wastewater treatment facility in California were investigated. Their BOD and NH₃ removal efficiencies, sludge productions, and economic efficiencies were compared. The BOD removal efficiency of the conventional activated sludge process (92.4~95.4%) is similar to that of the pure oxygen activated sludge process (91.9~96.2%). Further, both processes showed poor NH₃ removal efficiencies; 9~18% for the conventional activated sludge process and 0~11.1% for the pure oxygen activated sludge process. Such poor NH₃ removal efficiencies are probably because these processes are optimized for BOD removal. The pure oxygen activated sludge process produced 2~3 times more sludge than the conventional activated sludge process. The pure oxygen activated sludge process was slightly more economically efficient than the conventional activated sludge process (saved about 0.3 million $/yr).
Effects of different cell states of Microcystis aeruginosa on coagulation process
Hun Kyun Bae 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.3
Three different states of Microcystis aeruginosa, untreated cells, pure cells, and broken cells, were tested for coagulation efficiency to understand their effects on drinking water treatment facilities. Microcystis aeruginosa in its late log-growth phase to early stationary phase, day 12 of culture in the M11 medium, were collected since cells are the most active and reach its maximum population during those periods. Untreated cells samples showed worst results for turbidity removal while turbidities for pure cells and broken cells ones presented the similar levels with those for 0 cell samples after 3 Al-㎎/L of coagulant dose. Organic matters from broken cells were not properly removed throughout coagulation processes since samples with organic matters - untreated cells and broken cells - showed higher levels of E254 and E260 after jar-tests than pure cell samples did. Overall, coagulation processes were highly interrupted when the Microcystis aeruginosa cells and organic matters from cells were co-existed. In addition, algae originated matters which may not remove by coagulation process could lead the secondary pollution when algae are introduced into drinking water treatment facilities during waterbloom. Therefore, the facility should pay attention on the results since they have to assure their water quality for public health.
낙동강 유역 일부 폐수처리장 방류수 및 공단배수로의 휘발성유기화합물(VOCs)의 분포현황
배헌균(Hun Kyun Bae) 大韓環境工學會 2012 대한환경공학회지 Vol.34 No.4
낙동강 유역 일부 공단지역에 위치한 일곱 개소의 폐수처리장 및 두 개소의 공단배수로에서 휘발성유기화합물(Volatile Organic Compounds, VOCs)의 분포특성을 조사하였다. 시료는 2008년 5월부터 2008년 11월 사이 총 4회에 걸쳐 채취하였으며 총 17종의 VOCs를 분석하였다. 실험 결과, 8종의 VOCs가 일부 시료에서 검출이 되었고 검출농도는 종류와 시료채취 위치에 따라 달랐지만 모두 0.11 (Trichloroethylene)~5.81 (Toluene) ug/L 의 범위인 것으로 확인되었다. VOCs는 미량으로도 인간의 건강이나 수중 생태계에 심각한 영향을 미칠 수 있으므로 이들 물질이 비록 미량의 수준을 보였으나 검출이 된 이상 이들 물질에 대한 적절한 관리대책이 강구되어야 할 것으로 사료되며 본 연구에서 이들 물질에 대한 관리방안을 제안하였다. The discharge characteristics of Volatile Organic Compounds (VOCs) from seven wastewater treatment plants and two industry drains at Nakdong River basin were investigated. Four Sampling campaigns were conducted between May 2008 and November 2008, and tested for 17 VOCs. As results, eight VOCs were detected at some sampling sites, but their concentration levels were low; 0.19~3.41 ug/L, dependent on each sampling location and substance. However, proper management plans such as supervising and monitoring systems for VOCs are needed to control those pollutants since VOCs might affect human health as well as aquatic ecosystems with extremely low concentration levels.
배헌균(Hun-Kyun Bae) 계명대학교 낙동강환경원 2011 環境科學論集 Vol.15 No.1
The degradable organic matters such as BOD, COD matters were well maintained by wastewater treatment facilities. However, nondegradable organic matters has not been managed because current wastewater treatment facilities could not have any system to treat those matters. Proper methods, therefore, which could handle nondegradable organic matters should be provided. In this study, the possible managements for nondegradable organic matters were proposed and the study requires further researches which include experimental studies to prove proposed managements in thish study.