應用電凝系統處理攝影廢水之研究

攝影沖洗及印刷製版等相關行業所產生之攝影廢水雖然量不大，然而卻有污染物濃度高、成分複雜並含重金屬等特性，若以傳統廢水處理系統處理有其困難點。一般傳統廢水處理系統適用於較大量、佔地較廣及度不高之廢水處理，而電凝系統具有佔地小、反應時間短等優點，亦被美國環保署喻為廢水處理之新興技術。本研究主要將電凝處理技術運用於攝影廢水處理，藉由系統中pH與停留時間之變數控制，探討運用電凝系統處理攝影廢水之潛能。
實驗結果顯示，於pH=2時有較佳之系統效能、增加停留時間可高污染物去除率，然而停留時間的持續增加並不代表污染物去除率的持續提高。本研究之結果證實電凝技術在處理廢水之潛能。

The photoprocessing industry produces small quantity of wastewater that has the chzaracterisitics of highly concentrated in contaminants and heavy metals. Thus, there are some difficulties on photoprocessing wastewater treatment by traditional wastewater treatment systems that are generally occupied more and land space and suitable for large amount of wastewater and not so concentrated in nature. The Electrical Coagulation system, on the other hand, has the advantages of small land requirement and short reaction time, and has been assessed by the USEPA as one of the new and promising wastewater treatment, and investigated the COD removal efficiency of the system by controlling the parameters of pH and hydraulic retention time (HRT).
The results have revealed the electrical coagulation system has high efficiency at pH=2, and the increase of hydraulic retention time can raise the removal efficiency of contaminants. However, the COD removal efficiency reached a peak value when a certain HRT has employed, and the efficiency would not increase no matter how long the HRT was. This study has shown that the potential of the electrical coagulation system on photoprocessing wastewater treatment.