[中文]利用光电催化法去除含有高浓度氯离子,难降解有机物的油田废水
利用光电泥浆反应器和使用醋酸作为水解催化剂采用溶胶-凝胶法制备的纳米级二氧化钛粒子,对于光电净化含难降解有机污染物的高盐废水的应用可行性研究报告进行了研究。被处理废水的光电催化净化效率依据有两个,一个是被测废水的COD去除率,一个是利用埃姆斯试验来评价诱变活性的降低效果。实验结果表明,虽然高浓度的盐分仍存在于油田废水之中,对于净化废水光电催化仍是一种非常有效的方法。我们发现,利用光电催化方法所产生的COD去除率要远高于使用单一的光催化法或电化学氧化法在光电反应器中所产生的COD去除效率。COD的去除率可以通过添加过氧化氢或添加从含高浓度氯的废水中产生的活性氯来得到持续性的提高。对于各种操作条件对于光电效率的影响同样进行了细致的研究,如初始COD浓度的影响,施加电池电压,催化剂量和溶液的初始pH值。结果表明,当原料产生的废水稀释在1:1(体积/体积)的比例,有一个最高的COD去除率。而对于光电催化法对于高盐废水中有机污染物的去除,在酸性溶液中的去除效果要比中性或碱性溶液效果好。©2000爱思唯尔B.V.保留所有权利。
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[外文]Photoelectrocatalytic decontamination of oilfield produced wastewater containing refractory organic pollutants in the presence of high concentration of chloride ions
The feasibility study of the application of the photoelectrocatalytic decontamination of high saline produced water containing refractory organic pollutants was investigated in the slurry photoelectrocatalytic reactor with nanometer TiO2 particle prepared with sol-gel method using the acetic acid as hydrolytic catalyst. The efficiency of the photoelectrocatalytic decontamination of produced water was determined with both COD removal from the tested wastewater and the decrease of mutagenic activity evaluated by Ames tests. The experimental results showed that the photoelectrocatalysis is a quite efficient process for decontaminating the produced water, although there are high concentration of salt existed in oilfield wastewater. We found that the COD removal efficiencies by photoelectrocatalytic process are much higher than that of by photocatalytic or electrochemical oxidation individually in the photoelectrocatalytic reactor. The COD removal can be substantially improved by the added H2O2 and the generation of active chlorine from high concentration chlorides in the wastewater. The effects of various operating conditions, such as initial COD concentration, applied cell voltage, catalyst amount and initial pH value of solution, on the photoelectrocatalytic efficiencies, is also investigated in detail. The results showed that when the raw produced wastewater was diluted in a 1:1 (v/v) ratio, there is a highest COD removal efficiency. And the photoelectrocatalytic degradation of organic pollutants in saline water is much favored in acidic solution than that in neutral and/or alkaline solution. © 2000 Elsevier B.V. All rights reserved.[/外文]
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