Photoelectrocatalytic decontamination of oilfield produced wastewater containing refractory organic pollutants in the presence of high concentration of chloride ions.
Photoelectrocatalytic decontamination of oilfield produced wastewater containing refractory organic pollutants in the presence of high concentration of chloride ions.
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DOI：
10.1016/j.jhazmat.2006.05.083
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发表时间：
2006-11
影响因子：
13.6
通讯作者：
Guiying Li;T. An;Jiaxin Chen;G. Sheng;Jia-mo Fu;Fanzhong Chen;Shanqing Zhang;Huijun Zhao
中科院分区：
文献类型：
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作者：
Guiying Li;T. An;Jiaxin Chen;G. Sheng;Jia-mo Fu;Fanzhong Chen;Shanqing Zhang;Huijun Zhao
以醋酸为水解催化剂，采用溶胶-凝胶法制备纳米tio2颗粒，在浆料式光电催化反应器中对含难降解有机污染物的高盐采出水进行了光电催化除污的可行性研究。通过对受试废水中COD的去除和Ames试验评估的致突变活性的降低，确定了光电催化去污采出水的效率。实验结果表明，虽然油田废水中存在高浓度的盐，但光电催化是一种非常有效的去污工艺。结果表明，在光电催化反应器中，光催化法对COD的去除率远高于光催化法和电化学氧化法。通过添加h2o2和废水中高浓度氯化物生成活性氯，可大大提高COD的去除率。研究了初始COD浓度、外加电池电压、催化剂用量和溶液初始pH值等操作条件对光电催化效率的影响。结果表明，当原产废水以1:1 （v/v）的比例稀释时，COD去除率最高。在酸性溶液中光电催化降解咸水中的有机污染物比在中性和/或碱性溶液中更有利。
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 TiO2particle 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 H2O2and 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.