臭氧高级氧化法降解生化尾水中喹啉

Degradation of quinoline from biotreated effluent with ozone-based advanced oxidation processes

采用O_3、O_3/UV、O_3/H_2O_23种工艺对喹啉的去除、矿化效果,生化性提高及降解规律等方面进行了对比分析,结果表明,单独H_2O_2、单独UV不能有效地降解喹啉;单独O_3、O_3/H_2O_2对喹啉有一定的去除效果,但两者差别不大;反应时间为6 min时,喹啉去除率分别为78.7%和79%,反应30 min时,喹啉的矿化率为33.4%和38.2%;O_3/UV工艺明显优于前2种,在6 min内,喹啉基本降解完全,30 min矿化率超过90%;3种工艺的降解过程都很好地满足伪一级动力学规律,O_3/UV的表观反应速率常数(0.7204 min^(-1))大于单独O_3(0.2832 min^(-1))和O_3/H_2O_2(0.29 min^(-1))工艺的表观反应速率常数;采用O_3/UV工艺处理实际工业园区生化尾水,6 min内喹啉降解完全,30 min时,COD去除率为88%,TOC的去除率达到89%,UV254的去除率为96%,出水指标达到《城镇污水处理厂污染物综合排放标准》一级A标准。

The removal,mineralization and improvement of biodegradability of quinoline oxidized by O3,O3/UV,O3/H2O2 were respectively examined and their individual mechanisms were also unveiled in this study.H2O2 and UV were found to have little impact on the degradation of quinoline,while O3 and O3/H2O2 could perform better with similar removal value of 78. 7% and 79% respectively after 6 min oxidation. The mineralization of quinoline after 30 min was 33. 4% by O3 oxidation and 38. 2% by O3/H2O2. O3/UV performed the best among all processes. Complete degradation of quinoline was almost achieved after 6 min O3/UV oxidation along with over 90% mineralization after 30 min oxidation. O3,O3/H2O2 and O3/UV processes all follow the pseudofirst order reaction,with reaction rate constants of 0. 2832 min^-1,0. 29 min^-1and 0. 7204 min^-1,respectively.In the case of advanced treatment of biologically pre-treated industrial wastewater,O3/UV process yielded complete degradation of quinoline after 6 min as well as 88% removal of COD,89% removal of TOC and 96% removal of UV254 after 30 min,all of which meet the most stringent discharge requirement for WWTP in China.