Combined physical, chemical and biological treatments of wastewater containing organics from a semiconductor plant.
Combined physical, chemical and biological treatments of wastewater containing organics from a semiconductor plant.
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DOI：
10.1016/s0304-3894(02)00257-1
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发表时间：
2003-02
影响因子：
13.6
通讯作者：
Sheng H. Lin;C. D. Kiang
中科院分区：
文献类型：
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作者：
Sheng H. Lin;C. D. Kiang
本研究以某半导体厂之含有机物废水为研究对象。该废水具有色度大、化学需氧量（COD）高、挥发性有机物难降解、可生化性差等特点。由于这些特点，用传统的活性污泥法处理这种废水基本上是不可能的。在目前的工作中，结合物理，化学和生物的方法协同使用来处理废水。采用吹脱-改良芬顿氧化-序批式活性污泥法（SBR）组合工艺处理。采用气提去除废水中的大部分挥发性有机组分（特别是异丙醇），而芬顿处理分解剩余的难降解有机物，从而同时降低废水COD和颜色。在用其它低浓度、含有机物的废水流适当稀释后，废水流出物最终通过SBR法处理。进行了实验测试，以确定每个处理过程的有效性和最佳操作条件。试验结果清楚地表明了联合治疗的优点。该处理装置能将废水COD浓度从80, 000 mg/l降至100 mg/l以下，并能完全消除废水的色度。最终出水的总体水质超过了直接排放标准，甚至可以考虑将出水再利用。
Wastewater containing organics from a semiconductor plant was experimentally investigated in this study. The wastewater is characterized by strong color, high chemical oxygen demand (COD), a large amount of refractory volatile organic compounds and low biodegradability. Because of these characteristics, treatment of this wastewater by traditional activated sludge method is essentially impossible. In the present work, combined physical, chemical and biological methods were synergistically utilized to tackle the wastewater. The combined treatment consisted of air stripping, modified Fenton oxidation and sequencing batch reactor (SBR) method. Air stripping was employed to remove the majority of volatile organic components (notably isopropyl alcohol) from the wastewater, while the Fenton treatment decomposed the remaining refractory organics leading to simultaneous reductions of wastewater COD and color. After proper dilution with other low-strength, organics-containing wastewater stream, the wastewater effluent was finally treated by the SBR method. Experimental tests were conducted to determine the effectiveness and the optimum operating conditions of each treatment process. Test results clearly demonstrated the advantages of the combined treatments. The treatment train was found capable of lowering the wastewater COD concentration from as high as 80,000mg/l to below 100mg/l and completely eliminating the wastewater color. The overall water quality of the final effluent exceeded the direct discharge standard and the effluent can even be considered for reuse.