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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.
活性 Sludge工法에 의한 廢水處理 施設의 적정설계에 關한 硏究
朴在云,陸雲洙 관동대학교 1983 關大論文集 Vol.11 No.1
微生物에 의해서 分解될 수 있는 有機物이 主汚染物인 廢水의 處理를 위해서 活性 슬럿지工法이 가장 많이 채택되며 수많은 활성슬럿지工法의 變法들 및 在來式의 Plug flow를 지양하여 完全混合型을 널리 이용하는 경향이다. 完全混合 活性슬럿지工法에 의한 廢水 處理를 위해서 요구되는 시설의 規模는 지금까지 통상 經驗的인 水理學的 滯留期間에 의해서 決定되었으며 最近에 와서야 理論的이고도 實驗的인 타당성에 근거를 두고 設計할려는 硏究가 많이 이루어지고 있다. 活性슬럿지 廢水處理施設은 曝氣槽, 曝氣施設, 終末沈澱池, 슬럿지 返送施設 廢슬럿지 處理施設 等으로 構成되며, 이들 構成部分의 規模가 전체 施設의 施工費, 運營費, 그리고 維持費에 미치는 影響이 크므로 주어진 廢水의 流量과 濃度에 대해서 最小의 規模로 요구되는 處理效率을 얻도록 設計하는 것이 바람직하다. 本硏究에서는 活性슬럿지 廢水處理施設의 設計, 解析 및 運營을 위하여 중요한 媒介變數가 되는 微生物平均滯留期間, 流出水의 養分濃度, 曝氣槽의 微生物濃度, 슬럿지 返送率, 廢슬럿지量 등을 微生物의 特性인 繁殖係數, 內生呼吸率, 養分除去率 등으로 나타내고, 마지막으로 曝氣槽의 微生物濃度와 關聯시켜 終末沈澱池의 表面負荷率을 구할 수 있는 公式을 유도한 다음 4次元數의 槪念을 도입하여 쉽게 利用할 수 있는 도표를 作成함으로써 設計를 매우 용이하게 그리고 경제적으로 할 수 있는 方法을 提示하고 있다. 本 論文에서 提案된 方法에 의하면 活性슬럿지 廢水處理施設의 規模는 한가지로 고정되는 것이 아니고 경제적 부담을 最小化시킬 수 있는 최적설계법을 제시하였다. 앞으로 有機性廢水의 處理에 利用되는 微生物의 特性에 관한 硏究가 많이 進行되어 充分한 資料가 얻어지면 本 方法의 적용으로 廢水處理施設의 設計가 용이하게 될 것으로 믿는다. The activated sludge process has been widely applied for the treatment of wastewaters, the major pollution matter of which is biodegradable organics. Among the many modifications of the activated sludge process, complete miving method, instead of conventional plug flow type, is more acceptable because of its numerous merits. Thesizes of the facilities for the treatment of wastewaters by the complete mixing activated Sludge process have been determined based on the hydraulic detention times by experience. Recently, however, many researches are in progress for the development of design criteria for the activated sludge process on the basis of theory and experimental approval. An activated sludge wasstewater treatment plant is consisted of aeration tanks, aeration facilities, final settling tanks and waste sludge handling facilities, the sizes of which show great effects on the magnitude of the construction, operation and maintenance costsof the plant. Theredore, it is desirable to design an activated sludge wastewater treatment plant which can accomplish the required efficiency with a minimun size and costfor the treatment of a wastewater with a given flow and concentration. In this research, formula are developed to express the average solids retention time, effluent substrate concentration, MLSS concentration, sludge return rate and the amount of waste sludge, which are important parameters for the design, operation and analysis of an activated sludge wastewater treatment facility, in terms of microbial yield coefficient, endogenous respiration rate and substrate removal rate. Also, the surface settling rate of thefinal settling tank is expressed in terms of MLSS concentration. Finally, graphs are prepard using dimensionless groups so that the previously developed formula can be applied easily for design. According to the results of the research, an activated shudge wastewater treatment plant can be designed for least-cost optimization rather than fixedat one size. The procedure devisedin this research could be applied easily for the design of activated sludge wastewater treatment plants in future and more researches are recommended for the determination of microbial characteristics which are required for the treatment of organic wastewaters,