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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),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
양형재(Hyung Jae Yang),신웅배(Eung Bai Shin),정윤철(Yun Chul Chung),최훈근(Hun Geun Choi) 한국물환경학회 2000 한국물환경학회지 Vol.16 No.4
A bench-scale reactor using SBR process was experimented with an 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-P and its corresponding kinetic parameters. Removal rate of phosphorus was 77% in terms of total phosphorus. Effluent concentrations were 9.8㎎/ℓ BOD and 1.1㎎/ℓ T-P. Effluent quality was maintained consistently stable by controlling decant volume and operating cycles. The efficiency for phosphorus removal was increased due to decrease in BOD-SS loading value in the range of 0.25≤aeration time ratio ≤0.52.
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),김재훈(Jae-Hoon Kim),이성종(Sung-Jong Lee) 대한환경위생공학회 2007 대한환경위생공학회지 Vol.22 No.4
A wastewater treatment plant, operating process is physico-chemical/biological activated sludge attached sand filtration, was selected to evaluate effluent quality and pollutants removal efficiencies consideration for deriving the technology-based effluent limitation for petroleum refining industry discharge. The results of influent and effluent analysis were as follows: Average effluent quality were 0.076㎎/ℓ of coper, 0.084㎎/ℓ of lead, 0.036㎎/ℓ of zinc, 0.005㎎/ℓ of nickel and 0.004㎎/ℓ of cadmium, and the range of coefficient of reliability from 0.007 of copper to 1.0 of lead. Also, 95% of reliability, 0.112, 0.15, 0.063, 0.015 and 0.009㎎/ℓ, respectively, were remarkably lower than their effluent limitations. And to reach 95% reliability of effluent limitation at cleanness area, designed effluent quality of copper, lead, zinc and cadmium should be 0.268, 0.099, 0.526 and 0.008㎎/ℓ, respectively.