[[alternative]]The Benefits of Sludge Drying for the Operation of Sewage Treatment Plant

[[abstract]] 本研究以中壢工業區污水處理廠為例，進行污泥乾燥處理效益評估，乾燥前污泥含水率為80～90%，將乾燥溫度設定50度左右，經過乾燥機2～4小時乾燥處理後，污泥含水率降至30～50%左右。同時紀錄乾燥過程中操作參數，以計算乾燥處理所需消耗的能源及成本及減量後所節省之處理費用，並完成乾燥減量之成本效益評估。 有鑒於污水處理廠污泥處理費用越來越高，有必要進行污泥減量。本研究進行污泥乾燥處理之效益評估；成本包括乾燥機之設置成本及操作成本，效益則為因重量減量所減少之清運費。以中壢工業區污水處理廠為例，成本包括設置成本為1,799萬元，操作成本平以均電費12,828元/day估算。乾燥後污泥含水率減少42%，平均重量可減少56.3%，以平均污泥處理量10.23 ton/day，每日減重5.63 ton/day，以污泥清運價格6,450元/噸計算，日效益為24,317元/day。假設乾燥設施運轉10年，則總成本為167,980,760元，產生效益為69,637,240元，本益比為24.12，因此污泥乾燥值得污水處理廠推廣。[[abstract]] In this study, the sewage treatment plant of Zhongye Industrial Zone was adopted as an example to evaluate the effectiveness of sludge drying treatment. The moisture content of the sludge before drying was 80 to 90%, and the drying temperature was set at about 50 degrees. After drying for 2 to 4 hours, the moisture content of the sludge dropped to about 30 to 50%. At the same time, the operating parameters in the drying process are recorded to calculate the energy consumption and cost required for the drying process and the processing costs saved after the reduction, and the cost-benefit assessment of the drying reduction is completed. Sludge reduction is necessary based on the rise of sludge treatment cost. In this study, the benefits of sludge drying treatment are evaluated. The cost includes the setting cost and operating cost of the dryer, and the benefit is the sludge removal fee of weight reduction. The practical data of sewage treatment plant in Zhonghe Industrial Zone was used in this study. The cost includes the setup cost of N.T. 17.99 million, and the operating cost of N.T. 12,828 per day for the average electricity charge. The moisture content of sludge after drying is reduced by 42%, and the average weight can be reduced by 56.3%. Based on the average sludge treatment capacity 10.23 ton/day, the reduced weight is 5.63 ton/day. According to the sludge removal price N.T. 6,450 per ton, the daily benefit can be calculated as N.T. 24,317 per day. Assuming that the drying facility can be operated for 10 years, the total cost will be N.T. 167,980,760, and the benefit will be N.T.69,637,240. The profit-to-expenditure ratio is 24.12 Therefore, the drying sludge is worth promoting in the sewage treatment plant