含油廢水一直以來都是水污染中常見的一項污染源，其產生的範圍很廣，且因其密度比水小，所以浮於水面上造成水體溶氧不足、水生生物缺氧死亡、水體自淨降低及燃燒的安全問題。 目前工業上處理含油廢水多採用傳統的化學混凝，為了要有好的處理效果，混凝劑加藥量也相對提高，使得處理後污泥的產量增加，進而增加後續處理成本。本研究嘗試以電化學技術來處理切削油工業廢水所造成的濁度問題。實驗方法先以靜置的方法將含油廢水分為穩定與不穩定兩類，再使用電化學方法處理穩定的含油廢水。不同的溶液成分，在陰極與陽極的極板會產生不同的電化學反應，而各種反應會導致不同的物理化學除污程序，如膠羽可吸附水中污染物質、產生的氫氣、氧氣、氯氣造成浮除效果並改變水中酸鹼度等。 研究結果顯示直接電解法對濁度的去除的速率比間接電解法快，但是兩者在處理效率上則皆可達到90％以上。增加溶液中氯化鈉濃度可以加速反應進行及節省能量消耗，對於處理效率則無明顯的增加。本法應用在金屬加工業的實場廢水，能夠充分利用水中懸浮及沈澱的鋁屑，有效地去除水中的乳化物及雜質，並可將濁度由3261 FAU降至9 FAU。 Oily wastewater has been an issue in various industries for decades and is a common pollutant sources in water. Major industrial sources of oily wastewater include petroleum refineries, metals manufacturing and machining, and food processors. Since the density of oily wastewater is smaller than water, it limits dissolve oxygen level in water body and self-purification capacity, aquatic can not obtain enough oxygen and there is security concern of accidental fire. Currently chemical coagulation is the most popular method used in industry. To improve better treatment and to reduce the amount of added chemicals used in industry. A electrochemical process is studied in this research to reduce the turbidity of wastewater from industrial cutting process. When a predetermined direct voltage is applied between the electrodes. The settleable and suspended aluminum are dissolved in the vicinity of anode and form aluminum hydroxide with the hydroxyl ions generated on cathode. Aluminum hydroxide attaches to hydrogen bubbles generated by the electrolysis and promotes the flotation of sludge and other particles in the emulsion. This study indicates that the speed of treatment of direct electrolysis method is faster than that of indirect electrolysis method, but both achieve more than 90% turbidity removal. The concertration of sodium chloride can improve reaction speed and reduce the energy consumption, but there is no noticeable influence on treatment efficiency. For cutting fluids of the metal processing industry, it can abate turbidity from 3261 FAU to 9 FAU.
