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양형재,권오상,김재훈,이성종,정동일,김상훈,Yang, Hyung-Jae,Kwon, Oh-Sang,Kim, Jae-Hoon,Lee, Sung-Jong,Jung, Dong-Il,Kim, Sang-Hoon 대한환경위생공학회 2007 대한환경위생공학회지 Vol.22 No.2
K leather industry wastewater treatment plant(advanced treatment process) was selected to evaluate effluent quality and pollutants removal efficiencies. $BOD_5$ concentration of effluent was $3.95mg/{\ell}$ and its removal efficiency was 99.8%. Also, most of other pollutants removal efficiencies were over 90% as well. And 95% reliability of effluent concentration were $106.8mg/{\ell}$ of CODmn, $86mg/{\ell}$ of SS, $72.04mg/{\ell}$ of TN that is greater than the effluent limitation, $0.98mg/{\ell}$ of ABS, $1.8mg/{\ell}$ of n-Hexane, $9.7mg/{\ell}$ of $BOD_5$ and $0.11mg/{\ell}$ of Cr.
양형재(Hyung Jae Yang),박정민(Jung Min Park),김민정(Min Jung Kim) 大韓環境工學會 2008 대한환경공학회지 Vol.30 No.12
하수처리과정에서 온실가스인 N2O가 발생하는데, N2O의 지구온난화 기여율은 CO₂의 310배에 달한다. 본 연구에서는 하수처리공정에 따라 온실가스 배출계수가 어떤 차이를 보이는지를 분석하기위해 운전 중인 4개의 하수처리공정을 대상으로 조사하였다. 배출계수 산정을 위한 시료채취는 Flux Chamber를 이용하였으며, N2O 정량은 6 port gas sampling valve가 장착된 Agilent사의 GC로 분석하였으며, 검출기는 ECD를 사용하였다. 하수처리공정별 오염물질 유입 부하에 대한 N2O 배출계수 산정결과 5-stage 공정은 0.94 g-N2O/kg-TN으로 가장 낮았으며, 다음으로 활성슬러지공정이 2.65 g-N2O/kg-TN, Denipho공정이 9.30 g-N2O/kg-TN, 그리고 SBR공정이 26.73 g-N2O/kg-TN으로 가장 높게 나타났다. 하수처리에서 N2O 배출량 감소를 위해서는 조사대상 시설 중 5-stage 공정이 가장 적절한 것으로 평가하였다. Nitrous oxide(N2O) is well known as a greenhouse gas that contributes to the global warming (310 times more per molecule than carbon dioxide) and to the destruction of the ozone layer. The objective of this study is to estimate N2O emission factor using an emission isolation flux chamber from municipal wastewater treatment plants. N2O gas was analysed by GC/ECD with 6 port gas sampling valve. The results of this study were as follows. N2O emission factor of 5-Stage process from Y wastewater treatment plants was lowest as 0.94 g-N2O/kg-TN. And that of other processes were 2.65 g-N2O/kg-TN for Activated sludge process, 9.30 g-N2O/ kg-TN for Denipho process, and 26.73 g-N2O/kg-TN for Sequencing Batch Reactor process. We have known that 5-Stage process is most appropriate process to reduce greenhouse for municipal wastewater treatment plants.
하수와 소화슬러지의 CH₄가스 배출원단위 산정에 관한 연구
양형재(Hyung-Jae Yang),박정민(Jung-Min Park) 대한환경위생공학회 2008 대한환경위생공학회지 Vol.23 No.3
In order to study the estimate of CH₄ emission factors in the municipal wastewater treatment plants, the active sludge process, 5-stage process, Denipho process, and SBR process were investigated. When active sludge process, 5-stage process, and Denipho process were used in wastewater treatment plant, the CH₄ emission factors were 2.88, 1.61, and 0.57 g-CH₄/㎏-BOD, respectively. On the other hand, in the case of SBR process, it was 4.14 g-CH₄,/㎏-BOD. These results indicate that SBR process was effective for CH₄ emission in municipal wastewater treatment plants. Using the above processes, the methane emission factor and amount of waste water sludge were 4.78㎥/t and 12,204,506㎥/yr, respectively. The remove of BOD was a range of 93.91 ~ 98.63%.
양형재 ( Hyung Jae Yang ),김병익 ( Byung Ik Kim ),장남익 ( Nam Ik Chang ),김재령 ( Jae Lyeong Kim ) 한국물환경학회 ( 구 한국수질보전학회 ) 2005 공동 추계학술발표회 Vol.2005 No.-
The Juam reservoir, hydrological investigations on the catchment environment and pollutants inflow have been carried out simultaneously. The average COD in 1992 observed in Juam reservoir was 2.3㎎/ℓ, and reached to 2.9㎎/ℓ which is increased 0.6㎎/ℓ for 10 yeas. Following this trend, the water quality is expected to deteriorate down to the second-grade water quality exceeding the 3㎎/ℓ limit. In terms of chl-a, which is closed related with COD(correlation between COD and Chi-a, y=0.0732x+2.5953 ; r2=0.8141), the concentration exceeding the value of 46.5㎎/㎥ will not guarantee the water quality better than 3rd-grade drinking water resource. This result will help control the algal growth in the future by taking into account the expected value as a monitoring target.
양형재(Hyung-Jae Yang),이승훈(Seung-Hoon Yi),문경란(Kyung-Ran Moon) 大韓環境工學會 2017 대한환경공학회지 Vol.39 No.3
최근 막여과 공정은 입자상 물질뿐만 아니라 Giardia, cryptosporidium과 같은 병원성미생물이 효과적으로 제거됨에 따라 국내외 적용성이 확대되는 추세이다. 본 연구는 광주광역시 D정수장의 원수·침전상등수의 처리를 위해 120 m<SUP>3</SUP>/d 처리규모의 Pilot Plant (2014. 1월부터 운영)와 2,500 m<SUP>3</SUP>/d 처리규모의 실증실험시설(2015. 1월부터 운영)의 막여과 공정을 운영하면서 최적 운전조건과 한계여과속도를 찾고자 하였다. 정밀여과막의 Pilot-test에서 얻어진 운전모드는 유입 1.0분, 여과 36.5분, 공기역세 0.9분, 역세 1.0분, 배출 1.0분이었으며, 이를 적용하여 실증실험을 하였다. 한계여과속도(critical flux)는 Pilot 운전에서 Flux 20, 40, 56 및 62 LMH일 때의 시간의 변화에 따른 막간차압의 증가식을 기반으로 50 L/m<SUP>2</SUP>-h로 산정(TMP 0.5bar 이내)되었다. 화학세정은 1차로 산세정 2회, 2차로 알칼리 세정을 하여 95%의 회복율을 얻었다. 이러한 적정 조건으로 운전한 결과 처리수의 탁도는 봄·여름·가을·겨울 평균 각각 0.028, 0.024, 0.026 및 0.028 NTU, 연평균 탁도는 0.026 NTU로, 탁도 제거율은 98.4%로 나타났다. 광주광역시 D정수장의 원수·침전상등수를 1일 2,500 m<SUP>3</SUP> 처리하는 실증실험시설 운영을 통해 부유고형물 및 콜로이드성 물질을 제거하는데 탁월한 처리성능을 확인하였고, 일반적인 모래여과공정을 대체할 수 있는 적정 운영기술이 확보되었다. Membrane filtration has become more popular in drinking water treatment recently, since the filtration can control not only particulate matters but also pathogenic microorganisms such as giardia and cryptosporidium very effectively. Pilot-scale (120m³/d of treatment capacity) and test-bed (25,000 m³/d of treatment capacity) microfiltration experiments were conducted to find optimum operating mode and the critical flux. Optimum operating mode of pilot-test was assessed as inflow 1.0 min, filtration 36.5 min, air backwash 0.9 min, backwash 1.0 min and outflow 1.0 min with 50 LMH (L/min·m<SUP>3</SUP>) of critical flux. Critical Flux was calculated to be 50 L/m2-h (within TMP 0.5 bar) based on the increase formula of the transmembrane pressure difference according to the change of time at Flux 20, 40, 56 and 62 LMH in pilot operation. Chemical cleaning was first acid washed twice, and alkali washing was performed secondarily, and a recovery rate of 95% was obtained in the test-bed plant. The results of operating under these appropriate conditions are as follows. Turbidity of treated water were 0.028, 0.024, 0.026 and 0.028 NTU in spring, summer, autumn and winter time, respectively. Microfiltration has superior treatment capability and performance characteristics in removing suspended solids and colloidal materials, which are the main cause of turbidity and important carrier of metal elements, and it has shown great potential in being an economically substitute to traditional processes (sand filtration).
양형재(Hyung Jae Yang),신응배(Eung Bai Shin),정윤철(Yun Chul Chung),이재운(Jae Woon Lee) 한국물환경학회 1999 한국물환경학회지 Vol.15 No.1
A bench-scale reactor using SBR process was experimented with a synthetic wastewater. The main purpose of this investigation was to evaluate applicability in the field and process removal efficiencies in terms of BOD and T-N, and its corresponding kinetic parameters. Removal rate of nitrogen was 71% in terms of total nitrogen. Effluent concentrations were 9.8㎎/ℓ BOD and 11.2㎎/ℓ T-N, and was maintained consistently stable concentration by controlling decant volume and operating cycles. During the anaerobic phase, corresponding to the end of denitrification, the pH profile shows a maximum due to the alkalinity production during the reactions. And during the aerobic phase, the pH shows a rapid increase due to the CO₂ stripping and pH starts to increase again when ammonia nitrogen reaches the minimum level. Microscopic examination revealed that microcytes observed predominantly in sludge were Vorticella, Epistilis, Opercularia, Aspidisca, Chilodonella that are protozoa and Philodina, Rotaria, Notommata, Nematoda that are rotatoria