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폐콘크리트 재생세골재를 통한 매립지 침출수의 인 및 색도 제거 특성
오재일,정시열,이선구,최영화 중앙대학교 기술과학연구소 2001 기술과학연구소 논문집 Vol.31 No.-
건설폐기물로 방치되는 폐콘크리트 재생세골재를 이용하여 매립지 침출수의 인(P) 성분 제거 및 색도 제거에 활용하는 실험을 수행하였다. 재생세골재의 투입량이 증가할수록 불용성의 HAP(Ca(PO_4)_3OH)가 형성되어 침출수의 인 성분을 비례적으로 거의 완벽히 제거할 수 있었다. 침출수의 색도는 pH가 증가함에 따라 제거되는 특성을 보였으며, 재생골재는 pH를 증가시키는 역할을 통한 색도 제거 이외에도 15% 이상의 추가적인 색도 제거 특성을 보였다. 이는 재생세골재의 물리적인 특성으로 기인한 색도 물질 흡착으로 사료된다. The experiments were conducted to remove phosphorus or color components in landfill leachate by fine recycled concrete aggregates which were wasted uselessly. As increasing recycled concrete aggregates in leachate, HAP(Ca(PO_4)_3OH) was precipitated proportionally, resulting almost perfect removal of phosphorus in leachates. The color in leachate was also removed by increasing pH, however the addition of recycled concrete aggreagtes showed additional benefit to color removal except pH effects, supplementary removal (about 15% more) of color. It was reasoned that adsorption of color materials to aggreagtes was the main cause of this result. The physical properties of recycled concrete aggreagtes adsorption properties.
코크스 폐수를 이용한 활성슬러지 모델 파라미터의 민감도 분석
오재일,이병준,심효영,최상교 대한상하수도학회 2002 상하수도학회지 Vol.16 No.3
Activated sludge model (ASM, IAWQ Task Group) was developed as a general mathematical model to express major biological processes in municipal wastewater treatment. Therefore this model could be applied for the design of a wastewater treatment plant and used for finding optimal conditions in plant operation. Since biological processes adopting biodegradation have been also used to treat lots of industrial wastewater such as coke's wastewater, it is worthy to examine the applicability of ASM on the industrial wastewater treatment. In order to evaluate this possibility, the sensitivity analysis of seven parameters (Y_H,μ_H, b_H, k_h, K_S, K_(O,H), K_x) in ASM was conducted with regard to the SCOD (soluble chemical oxygen demand) removal in coke's wastewater treatment. It has shown that μ_H (maximum specific growth rate) of ASM was the most sensitive one in the SCOD removal process, and relative sensitivity was decided in order of μ_H >> b_H, K_S > Y_H, K_(O,H), K_h, K_x, consequently. Based on the sensitivity analysis and calibration procedure of ASM with the data from coke's plant, the decided parameter values were valid for the proper simulation of this industrial wastewater plant, showing adequate fitting between real and simulated data. In summary, the mathematical model of ASM was suitable for the simulation of coke's wastewater treatment plant.