本研究主要探討,使用實廠散熱器製造業拋光水洗水,進行實驗與研究,利用Jar-Test 與混凝劑(PACl)進行預處理,找出最佳的pH 與最佳混凝劑量,使用不同的混凝劑量來進行前處理與積垢指標試驗,來探究實廠廢水最佳回收再利用參數,可以供相同製程建置廢水回收再利用的參考。;This study mainly discusses the use of polishing washing water in the radiator manufacturing industry of the real factory to conduct experiments and research, use Jar-Test and coagulant (PACl) for pretreatment, find out the optimal pH and optimal coagulation dosage, and use different coagulation dosages to conduct pretreatment and fouling index tests to explore the best recycling and reuse parameters of real factory wastewater, which can be used as a reference for the same process to build wastewater recycling and reuse.