催化二氧化氯氧化处理难降解废水特性研究

Study on refractory wastewater treatment by chlorine dioxide catalytic oxidation

在二氧化氯化学氧化和催化氧化体系对比试验的基础上,探讨了催化二氧化氯氧化的过程与催化特性。试验结果表明:二氧化氯化学氧化处理CODCr为3 500 mg/L的配制难降解废水时, 最佳反应pH为6-8、氧化剂用量为1 000 mg ClO2/L,反应时间为60 min,CODCr去除率可达50%左右;而采用催化二氧化氯氧化处理配制废水时,最佳反应pH为2左右,氧化剂经济用量为800 mg ClO2/L,反应时间为45-60 min,CODCr去除率可达80%以上,去除1 kgCODCr氧化荆费用为3.7元, 废水可生化性得到很大的提高,表明催化二氧化氟氧化法是一种新型高效的难降解废水处理技术。

Both the ClOa chemical oxidation system and C1O2 catalytic oxidation system were studied experimentally, and the catalytic character of the latter was discussed in this paper. The experimental results show that in case when prepared refractory wastewater with CODCr = 3 500 mg/L was treated by ClO2 chemical oxidation process, the best pH = 6 to 8 was founded when oxidant consumption-1 000 mg ClO2/L, reacting time = 60 min, at this time 50% of CODCr was removed. When the same prepared wastewater was treated by ClO2 catalytic oxidation system, 80% of CODCr removal was obtained in reaction time of 45 to 60 min, oxidant consumption = 800 mg ClO2/L at best pH=2. At this case the oxidant expenses was RMB 3.70 for 1 kg of CODcr removal. Evidently by catalytic process the biological degradability of the wastewater was improved. The economical and technical evaluation illuminates that ClO2 catalytic oxidation is an efficient method to treat refractory wastewater.