ABSTRACT In this study, the real herbicide wastewater was degraded by electrocatalysis oxidation followed by subsequent biological treatment. The influence of several process variables of electrocatalysis oxidation, such as current density, pH and electrode gap on chemical oxygen demand (COD) removal ratio, was investigated and the optimum conditions were determined. The results indicated that COD removal ratio reached 87.0%, and the COD decreased from 7519 mg L−1 to 980 mg L−1 after 120 min electrolysis under the degradation parameters of the current density of 4 a dm−2, pH value of 4 and the plate spacing of 1.0 cm. The electrocatalysis degradation of real herbicide wastewater followed pseudo-first-order kinetics. The BOD5/COD increased from 0.18 to 0.43 after 120 min electrolysis. Then, the biological contact oxidation process was performed on the effluent of the electrochemical process. The results showed that the final COD removal ratio reached 95.8% after biological contact oxidation on the following condition: hydraulic residence time was 12 h and the aeration quantity was 0.6 m3 h−1. Conclusively, it can be proved that electrocatalysis is feasible as a pre-treatment technology to treat real herbicide wastewater.

中文翻译：

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电催化应用与生物处理相结合的真正除草剂废水处理

摘要 在这项研究中，真正的除草剂废水通过电催化氧化降解，然后进行生物处理。研究了电催化氧化的几个工艺变量，如电流密度、pH 值和电极间隙对化学需氧量 (COD) 去除率的影响，并确定了最佳条件。结果表明，在电流密度为4 a dm-2、pH值为4的降解参数下，COD去除率达到87.0%，电解120 min后COD从7519 mg L-1下降到980 mg L-1并且板间距为1.0 cm。实际除草剂废水的电催化降解遵循拟一级动力学。电解 120 分钟后，BOD5/COD 从 0.18 增加到 0.43。然后，对电化学过程的流出物进行生物接触氧化过程。结果表明，在水力停留时间为12 h，曝气量为0.6 m3 h-1的条件下，生物接触氧化后最终COD去除率达到95.8%。综上所述，可以证明电催化作为处理真正除草剂废水的预处理技术是可行的。