截流式微過濾搭配混沈處理回收淨水場濾池反沖洗水之研究

The Study of Dead End Micro-Filtration with Coagulation/Sedimentation Pretreatment to Reclaim Filter Backwash Water

本研究主要採集潭頂淨水場及彰化第三淨水場之反沖洗水，首先分析各淨水場之反沖洗水的水質項目，接著以不同處理方式進行實驗，分別為反沖洗水直接微過濾，或者是經沉澱處理、混凝／膠凝前處理後，再分別進行過濾並分析各反沖洗水處理後的水質。結果顯示，以地表水（潭頂淨水場）而言，發現直接過濾及沉澱前處理搭配薄膜微過濾將會產生嚴重阻塞，然而採用混凝／膠凝前處理搭配薄膜處理可以增加產水率，反沖洗水經混凝／膠凝前處理搭配薄膜孔徑0.5μm之過濾水，在濁度、大腸桿菌及總菌落數方面皆符合飲用水水質標準。以地下水（彰化第三淨水場）而言，採用直接過濾薄膜孔徑0.5μm或混凝／膠凝前處理搭配薄膜孔徑0.5μm，在濁度、色度、大腸桿菌及總菌落數皆符合飲用水水質標準。

In this research, the supernatant of the waste backwash water treated by Dead-End microfiltration (DEMF) process combined with coagulation/sedimentation was evaluated. The backwash water samples in this research were collected from Tanding Water Treatment Plant and Chang-Hwa Third Water Treatment Plant. First, the raw water qualities were analyzed for each treatment plants. And then, different treatment processes were considered and executed, such as coagulation/sedimentation combined with MF Process, sedimentation with MF and direct MF Process. After that, the treated water qualities were analyzed for each process. The results indicated that the backwash wastewater from surface water source treated by sedimentation only combined with MF or directly MF process was confirmed to demonstrate the serious scaling problems. However, the water treated by coagulation/sedimentation combined with MF Process reached high efficiency of clean water. Coagulation/sedimentation combined with MF Process specifically for 0.5 μm pore size of membrane executed the optimal result that reached the standards of turbidity, Coli-Forms and total bacterial counts. For Chang-Hwa Third Water Treatment Plant, the water quality treated by 0.5 μm pore size of membrane reached drinking water standards in turbidity, Coli-Forms and total bacterial counts, no mater with filtration only or coagulation/sedimentation combined with MF.