摘要：

对电化学还原—氧化降解甲苯硝化废水进行了研究，考察了不同电流密度和反应时间对降解效果的影响，并且考察了出水的可生化性以及生物毒性的变化。结果表明：在最佳电流密度20 mA/cm²，最佳处理时间4 h下，硝化废水的SUVA（废水芳香性指标）去除率可以达到56.4%，COD去除率为26.6%，B/C由原水的0.115提高到0.435，急性生物毒性也有明显降低，TU值由原先的285.7降低为41.7。说明电化学还原—氧化法对硝化废水可生化性的提高，毒性的降低是有显著作用的。

关键词: 电化学还原, 电化学氧化, 甲苯硝化废水, 急性生物毒性

Abstract:

The degradation of toluene nitrification wastewater by electro-catalytic reduction-electro-oxidation process has been studied. The effects of different current density and reaction time on the treatment result, the effluent biodegradability and changes in biological toxicity are investigated. The results show that under the following optimum conditions:current density is 20 mA/cm², and reaction time is 4 h, the SUVA removing rate of nitrification wastewater reaches 56.4%, the removing rate of COD reaches 26.6%, the B/C increases from 0.115 to 0.435, and the value of TU is reduced from the original 285.7 to 41.7, indicating that electrochemical reduction-electro-oxidation process has remarkable effects on the improvement of wastewater biodegradability and the reduction of toxicity.

Key words: electro-reduction, electro-oxidation, toluene nitrification wastewater, acute toxicity

中图分类号: 

• X703.1