Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 106, Taiwan, ROC.
Graduate Institute of Environmental Engineering, National Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei, 106, Taiwan, ROC.
Chemosphere. 2020 Jun;249:126139. doi: 10.1016/j.chemosphere.2020.126139. Epub 2020 Feb 7.
Heterogeneous Fenton oxidation of trichloroethylene (TCE) catalyzed by sewage sludge biochar was studied. The highest TCE removal efficiency was 83% at pH 3.1, catalyzed by 300 W biochar. The biochars produced at higher microwave power levels provided better catalytic effect, due to higher iron contents and specific surface areas. Reactivity of sewage sludge biochar maintained after several uses, which provides an advantage for using as a permeable reactive barrier to remediate groundwater pollution. Chromium, copper, nickel, lead, and zinc were found in the leachate generated from sewage sludge biochar, and most of the concentrations were lower than the standards for non-drinking water use. Besides, copper, zinc, and iron were found in the reaction solutions of Fenton oxidation. Because of the highest dosage required for Fenton oxidation, the environmental impact caused by 200 W biochar is highest. The environmental impact caused by 300 W biochar is lowest. Among the four endpoint impact categories in the life cycle assessment (LCA), human health is the highest concern, whereas ecosystem quality is the least. According to experimental and LCA results, the optimum microwave power level would be 300 W. The primary impact source is microwave pyrolysis because of high energy usage.
采用污水污泥生物炭对三氯乙烯（TCE）进行非均相芬顿氧化反应。在 pH 值为 3.1 时，用 300 W 生物炭催化，TCE 的去除效率最高，达到 83%。在更高微波功率水平下生产的生物炭提供了更好的催化效果，这是由于其铁含量和比表面积更高。污水污泥生物炭在多次使用后仍保持反应活性，这为用作可渗透反应屏障来修复地下水污染提供了优势。从污水污泥生物炭浸出液中发现了铬、铜、镍、铅和锌，其中大多数浓度低于非饮用水的标准。此外，在芬顿氧化的反应溶液中也发现了铜、锌和铁。由于芬顿氧化需要最高剂量，因此 200 W 生物炭造成的环境影响最高。300 W 生物炭造成的环境影响最低。在生命周期评估（LCA）的四个终点影响类别中，人类健康是最受关注的，而生态系统质量是最不受关注的。根据实验和 LCA 结果，最佳微波功率水平应为 300 W。主要的影响源是微波热解，因为其能耗很高。
