工業區污水處理廠之各項處理功能缺失中，以硬體設施不良及其操作維護失當為主要的二類因素。本研究針對案例污水處理廠，以CPE綜合成效評估法，配合各操作單元的功能評估，探討污水廠設計功能和操作條件的合適性，並提供設備增設或改善的參考依據，以有效發揮工業區污水處理廠之操作成效。 研究結果顯示，本案例廠由於納管廠商之訂單外移、經濟景氣影響、廢水回收等因素，致使進流水量有日漸降低的趨勢，且由於進駐廠商中染整業佔進流水量比例過大，致使廢水有生物不易分解及含色度等特性。CPE成效評估結果發現，本案例廠廢水處理程序之功能大致正常，部分單元只需進行非結構性的改善計畫即可進一步提升成效，唯污泥處理能力不良，污泥處理單元的結構須改變或擴充。另外，根據單元設計參數與實廠操作參數比對之結果，本案例可調整曝氣沈砂池之進流水量，或增加曝氣量，以改善池底有機固體物淤積情形；而沈澱池由於設計功能大於目前操作值，可調整運轉池數而交替使用，以節省電力及降低設備損耗。案例廠經適當調整操作參數後，與前一年度相較，耗電量可節省0.4度/每噸廢水，同時可減少單位污泥產生量達0.07公斤/每噸廢水。 Among the various functional deficiencies of wastewater treatment plants, the hardware facilities failure and their improper operations and maintenance are the two major factors. In order to provide a reference for facilities expansion or improvement and to perform excellent operating efficiency of wastewater treatment plants, this study investigated the designed functions and process operating conditions for the case plant by applying CPE (Comprehensive Performance Evaluation) method with performance evaluation of treatment processes. The results demonstrated that due to lost orders of factories, impact of economic recession, and wastewater recycling, the influent of the plant was gradual decrease. Also, the textile wastewater occupied higher percentage of influent wastewater from factories in industrial parks, resulting in the non-biodegradable and high-colored wastewater characteristics. Based on the results of CPE, the performance of wastewater treatment process was normal and only the improvement of non-structural changes are required to improve functions for some treatment units. However, the performance of sludge treatment process was poor and the related units must have structural changes to be improved. Compared actual operating parameters with designed ones of treatment units, it was suggested to adjust the influent quantities of aerated grit chamber or increase the aeration to reduce the settling of organic solids on the bottom of chamber. On the other hand, the clarifiers had extra capacity due to the over-designed parameters, it was then suggested to change the number of clarifier worked in turns to save the cost of electricity and to reduce the consumption of equipments. With other benefits of improvement, when adopting proper parameters in this plant, the electricity cost could save 0.4 kW-h per ton of wastewater and the sludge production would be reduced at 0.07 kg per ton of wastewater.