微奈米級δ-MnO2及TiO2對紙漿廢水之 有機污染物催化轉化作用之研究

Catalytic Transformations of Organic Pollutants by Micro-nano Scale δ-MnO2 and TiO2 in Paper Pulp Waste Water

蔡明翰(Ming-Han Tsai)

指導教授 ： 王敏昭 ； 張簡水紋

朝陽科技大學/理工學院/環境工程與管理系/碩士(2010年)

摘要

紙漿和造紙工廠造紙在處理過程中，使用大量的水，所以產生大量的廢水，形成一個水污染的主要來源。廢水中含大量懸浮固體物、高濃度有機物以及複雜的化學特性，導致廢水高COD的水質特性。高級氧化處理的優點在於能將有機物打斷其鍵結而轉化成較小的物種甚至能完全礦化有機物。本研究利用 δ-MnO2及TiO2對紙漿廢水進行光催化降解廢水中的有機污染物。探討照光與否、不同pH值、觸媒添加量等不同參數對COD降解率的影響及探討反應過程之光催化機制。在UV光催化之結果指出，照光情況下廢水COD去除率比未照光顯著，添加δ-MnO2的廢水比添加TiO2的廢水去除率高。當廢水pH調降至pH 5，其COD去除率大於廢水pH 7及pH 9，但處理後的廢水，pH值無法達到放流水標準。添加0.1% δ-MnO2有最佳COD去除效果，經過5 hr處理去除率達到71%。其次是添加0.05%的δ-MnO2。以UV光及太陽光做為光源進行試驗，發現廢水中添加0.1% δ-MnO2之處理得到相似的去除效果。就成本來評估，以太陽光催化可以節省許多成本，以太陽光取代UV光是可行之技術。若運用在實場，建議以0.1% δ-MnO2處理紙漿廢水。

關鍵字

光催化作用 ； TiO2 ； δ-MnO2 ； 有機污染物

並列摘要

The paper and pulp industry utilizes a high quantity of water in production process, and produce equally large amounts of waste water, which constitutes one of the major sources of water pollution. A lot of suspended solids, high concentration of organic matter and complex chemicals present in this wastewater leading to the water quality characteristics of wastewater of high COD. Advanced oxidation processes (AOP) have the advantage that they can conversion of organic pollutants to short species and even to their complete mineralization. In this study batch experiments were conducted to asses the efficiency of δ-MnO2 and TiO2 for degradation of organic pollutants in wastewater. The effects of various parameters on degradation of organic pollutants include catalyst type, catalyst dosage, pH value, irradiation with light or not were investigated. Further, the photo catalytic mechanism of reaction was also evaluated. The results showed that the reduction of COD was higher with irradiation of light than with out irradiation of light and δ-MnO2 shows good efficiency compared to that TiO2. The wastewater pH lowering to pH 5.0, the COD reduction rate was higher compare with the pH values 7 and 9, but that pH can not meet with effluent standards. The experiments demonstrated that the maximum reduction of COD occurred with dosage of 0.1% δ-MnO2 and same reduction results were observed with irradiation UV light and sunlight. It was thus suggested that the reduction of COD with irradiation of sunlight is a feasible technology over UV light irradiation. In order to simulate for maximum degradation of organic pollutants in real situations the needed optimal requirements are 0.1% δ-MnO2 with irradiation of sunlight.

並列關鍵字

photocatalytic ； TiO2 ； δ-MnO2 ； organic pollutants

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