本研究係以高透水性濾材，運用溼式技術，製出高效能低成本之重金屬吸附性濾材。矽藻土的改質方法，係將矽藻土採用酸液浸泡、鹼液浸泡及表面植入氫氧化鐵等方式，進行活化改質。經恆溫吸附試驗結果發現，鹼性及表面植鐵鹽對吸附銅的能力，明顯優於酸性及原始條件，且適用於Langmuir 吸附模式。此外經評估改質效能及經濟效益後，本研究選定以鹼性改質之矽藻土，進行管柱試驗和實廠含銅廢水之模型處理試驗。 由動力吸附試驗結果發現，鹼性改質法較原始矽藻土之吸附量及去除效率明顯提升；由管柱實驗結果得知，於1000BV(bed volumes)廢水通過之前，對於銅的去除效率為98%以上，最後由實廠含銅廢水之管柱模型試驗結果確知，該廠之3 ppm含銅放流水，經矽藻土管柱模型處理後，去除率為65~84%，可達到進一步降低重金屬銅濃度及符合更嚴格的排放要求。 This study was to develop a high efficiency and low cost modified diatomite absorbent for copper removal from wastewater. The diatomite was modified and activated by three ways, which were acid etching, alkaline etching and iron hydroxide coating. According to the results of isotherm adsorption test, the efficiencies of copper adsorption by alkaline etching and iron hydroxide coating diatomite were better than those of acid etching and original diatomite. The adsorption capacity of copper by modified diatomite was fitted to Langmuir adsorption model. After the evaluation of removal efficiency and economic feasibility, alkaline modified diatomite was selected to run column and pilot scale adsorption tests. The results of kinetic adsorption test showed that the alkaline modified diatomite could enhance copper adsorption capacity and removal efficiency as compare to that of the original diatomite. The results of laboratory scale column tests revealed that the copper removal efficiency was greater than 98% before 1000 bed volumes of wastewater passed through. The copper removal efficiencies of 65~84% were achieved by pilot scale treatment facility for treating real wastewater containing 3 ppm of copper. Therefore, the utilization of alkaline modified diatomite could further reduce the copper concentration and was feasible to meet the more restricted discharge criteria.
