活性炭纤维上4-氯酚及焦化废水尾水的O_3催化氧化降解实验研究

Study on catalytic ozonation of 4-chlorophenol and coking wastewater on activated carbon fiber

选择YT-1000型活性炭纤维(ACF)作为催化剂,考察ACF与O3协同作用催化降解水溶液中4-氯酚的最佳反应条件,并将该条件应用于焦化废水生物处理尾水中难降解有机污染物的催化氧化。ACF表面具有丰富的微孔结构,对4-氯酚有良好的吸附作用,在动力学上提高了其与O3反应的起始浓度,并且在ACF表面含氧、含氮等基团的催化作用下发生氧化反应,1 L浓度为100 mg/L的4-氯酚水样中投加2 g ACF反应6 min时,吸附作用对TOC的去除率为43.4%,而ACF协同O3作用时的TOC去除率提高到72.5%,协同增效作用为67.1%;在选定的反应条件下,ACF协同O3降解焦化废水生物处理尾水,60 min时的TOC与色度的去除率分别达到56.8%和96.3%。上述研究过程证明了吸附作用与催化作用的协同能有效降解生物过程不能降解的焦化废水中惰性有机污染物。

The ozonation of 4-chlorophenol was catalyzed by YT-1000 activated carbon fiber,the optimal reaction conditions were studied and used for catalytical oxidation of the organic pollutants hardly to be degraded in the coking wastewater. ACF with abundant micro pore on the surface absorb 4-chlorophenol efficiently,higher initial concentration of 4-chlorophenol increased the reaction kinetics of 03 oxidation and the groups containing O and N on the ACF surface can catalyze the ozonation. When 2 g/L ACF was added to 100 mg/L 4-chlorophenol for 6 min,the TOC removal rates of sorption was 43.4% while it increased to 72.5% when ACF cooperated with 03 which is 67.1% increasing of the removal rate. Under the optimum reaction conditions,the coking wastewater treated by biological tanks were degraded by ACF cooperated with 03. After 60 min, the removal rates of TOC and color achieved 56.8% and 96.3% respectively. The results indicated that the cooperation of sorption and catalysis can effectively degrade the inertial organic pollutants in the coking wastewater treated by biological tanks.