电化学-生物共代谢处理硝基苯废水研究

研究了电化学对硝基苯废水的预处理作用。正交试验结果表明，电解硝基苯时，在电解电压达到化学键断裂所需要能级的情况下，电量越多，电解反应越容易进行，降解效果越好。在电压15V、电流0.30A、pH值为3、电解时间为50min的最佳电解条件下硝基苯的去除率为100%。电解机理研究结果表明，硝基苯在电解过程中主要发生的是还原反应生成苯胺，苯胺转化成对氨基酚、对苯二酚和马来酸，进而被彻底矿化。电解预处理后的硝基苯溶液可生化性明显提高，经微生物共代谢处理14 h后苯胺去除率达99.5%，溶液COD去除率达到82%，18 h 时COD去除率可达到94%，说明其中的有机物几乎全部被降解成CO2和H2O。

STUDY ON TREATING NITROBENZENE WASTEWATER BY ELECTROCHEMISTRY-BIODEGRADATION

Electrochemical method was used to pretreat the nitrobenzene containing wastewater. A set of orthogonal experiments was carried out to study the influencing factors. Test results showed that under the optimum conditions of an electrolysis voltage of 15 V, an electrolysis current of 0.30 A, a pH value of 3 and a reaction time of 50 min, the removal rate of nitrobenzene was 100%. The pretreated wastewater was easy to be biodegraded. By treating with microorganism for 14 h, the removal rates of aniline and COD reached 99.5% and 82%, respectively. After 18 h biodegradation, the COD removal rate could reach 94%, indicating that most of the organic compounds in the wastewater were biodegraded to CO2 and H2O.