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간혈적 흐름 상태하에서 활성슬럿시 반송율에 의한 폭기조의 최적설계에 관한 연구
육운수 忠州大學校 1980 한국교통대학교 논문집 Vol.13 No.3
The aeration tank is one of the most important facilities for the treatment of wastewaters by an activated sludge process. In this paper the effects of the sludge volume index and the volumetric recycle ratio of activated sludge on the volume of aecation tank are discussed. In general, according to the results of the research, the sludge volume index of activated sludge decreases and the settleability of the sludge is improved as the solids retention time is increased. The volume of an aeration tank can be reduced by increasing the volume of return sludge and the mlss concentration in the areation tank. However, within the limits of technical and process feasibility the final choic of the design volume of an aeration tank would be based on an economic analysis of the factors determining the cost associated with a given volume such as reactor capital cost recycle pumping costs, and areation or mixing costs.
NEAR FIELD BUOYANT EFFLUENT INTO A CONFINED CROSSFLOW
陸雲洙 관동대학교 1994 關大論文集 Vol.22 No.2
The dilution and the shore attachment of buoyant effluent into a crossflow are investigated experimentally. The effluent is produced by discharging warm water through a side channel into an open channel crosflow with the same depth to the side channel flow. Buoyancy causes the effluent to lift off the bottom, spread across the crossflow and sta ys as the surface layer. The geometry of the recirculation region and the dilution of the effluent depends mainly on the buoyancy. The condition of the shore attachment can be specified by ratios of velocities and Froude numbers.