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왕창근,오영미 忠南大學校 環境問題硏究所 2001 環境硏究 Vol.19 No.-
Rapid sand filters used for removing turbidity materials in drinking water treat ment plants should be periodically backwahed to eliminate filtered flocs. Water and water/air backwashing systems have been adopted traditionally. However, these systems have some drawbacks such as incomplete washing of filters, large amount of backwashing(DABW) process was developed(Patent pending) to solve the drawbacks mentioned above. Wahshing efficiency of rapid sand filter has been tremendously improved and head losses after backwashing decreased. Further, backwashing time could be reduced significantly resulting in saving large amount of backwashing water.
왕창근,강호 충남대학교 환경문제연구소 2000 環境硏究 Vol.18 No.-
A series of experiments were performed to analyze wastewater characteristics and to determine the treatment process. Nitrogen and phosphorus removal efficiency became very important factor in determining the process recently. There are many processes to reduce nitrogen and/or phosphorus (Bardenpo, A/O, A2/O, VIP, UCT etc). The KIDEA process, which was selected in this study, Consists of aeration, sedimentation, and intermittent withdrawl steps. The bench-scale experiment was performed using Sabkyo and mixed wastewater and influent was fed to the reactor continuously. Effluent concentration of T-N was 11.1∼14.1 mg/L. Effluent concentration of T-P was 2.6∼3.63 mg/L. The KIDEA process can be applied to treat the wastewater with low carbon concencentration.
RO 및 NF막에서의 부식질에 의한 Fouling 및 미량오염물질의 제거
왕창근,차준철,이용현,김수동,류주환 대한상하수도학회 2004 상하수도학회지 Vol.18 No.1
This study investigated the phenomena of membrane fouling by NOM and the effect of the fouling on removal of micro-pollutants. NOM has a great effect on decline of permeate flux. Permeate flow rate was reduced by 88% in RO and 34.8% in NF for 323hr operation period. Removal rate of UV_(254), is 87.4% in RO and 78.5% in NF and removal rate of DOC is 42.7% in RO and 32.9% in NF for 2㎎/l humic acid. Removal efficiency of the micmpollutants by the RO and NF membranes fouled by humic acid was mostly lower than that by the new membrane. The concentration polarization which affects the flux and the rejection was thought to occur in the active layer of the membrane, as the membrane was getting fouled.
왕창근,Wang, Chang Keun,Weber, Walter J. Jr. 대한토목학회 1993 대한토목학회논문집 Vol.13 No.2
여러 오염물질 사이의 흡착 경쟁, 평형, 물질확산의 상호 연관성을 이해하는 것은 효율적인 활성탄 흡착탑 설계 및 운전을 위하여 중요하다. 흡착탑내에서의 오염물질의 확산 및 흡착 현상을 동역학적 및 수학적으로 예측하기 위하여 "Micro-Diameter-Depth Adsorption System" Technique을 개발하여 평형 및 물질확산 계수들을 측정하였다. 활성탄 입자의 외부 "Film Transfer"와 입자 내부에서의 "Surface Diffusion"을 고려한 오염 물질 사이의 흡착경쟁, 탈착, Chromatographic Displacement Effect 등을 Homogeneous Surface Diffusion Model(HSDM)을 이용하여 예측했다. p-Chlorophenol(PCP)/p-Nitrophenol(PNP)의 Breakthrough Curve에서 PCP는 PNP에 의해 Displace되는 현상을 볼 수 있었으며 HSDM은 이를 잘 예측하였다. Dodecylbenzenesulfonate (DBS)는 흡착된 DBS의 일부분이 비가역적 흡착반응을 보인다는 가정하에서 HSDM에 의해 잘 예측될 수 있었다. It is important to understand the interrelationship between adsorption, equilibrium and mass transport in efficient design and operation of the granular activated carbon(GAC) adsorption systems. In this study, the micro-diameter-depth adsorption system(MIDDAS) technique was developed to estimate equilibrium and mass transport parameters, which were utilized to simulate adsorption and mass transport phenomena dynamically and mathematically. The homogeneous surface diffusion model(HSDM) utilizing the estimated equilibrium and mass transport parameters including the film transfer coefficients and surface diffusivities from the MIDDAS technique, successfully predicted competitive adsorption, desorption and chromatographic displacement effects. In the binary solute system of p-chlorophenol(PCP) and p-nitrophenol(PNP), PCP was displaced by PNP and the HSDM could predict successfully. While the HSDM described the desorption breakthrough curves for PCP, PNP and PTS well when complete reversible adsorption was assumed, the desorption breakthrough curves for DBS could be predicted after subsequent incorporation of the degree of irreversibility into the model simulations.