臭氧强化光催化对垃圾渗滤液的深度处理

Advanced treatment of landfill leachate by the combined use of photocatalysis and ozonation

用臭氧强化光催化工艺对垃圾渗滤液进行了深度处理,优化了工艺参数,对比了最佳工艺条件下各时间段的出水指标。该工艺在催化剂投加量0.5 g/L,pH值8.45左右,O3流量0.4 L/min,O3浓度16.8 mg/L,初始COD浓度430 mg/L时最佳,COD和UV254的去除率均在60%以上;最佳工艺条件下1.0 h出水的BOD5提高了75.42%,2.0 h出水BOD5/COD从初始的0.05升高至0.23。结果表明,臭氧强化光催化工艺不仅可以提高处理能力,还有效地改善了出水的可生化性。

The advanced treatment of landfill leachate was investigated by the combined use of photocatalysis and ozonation （ UV/O3/TiO2）. In landfill leachate, the main factors of UV/O3/TiO2 were optimized, and the indexes of outlet at time intervals were also compared under the optimum process condition. With the removal of COD and UV254 being over 60% , UV/OJTiO2 had best removal efficiency under the condition with TiO2 dosage of 0.5 g/L, pH value of about 8.45, ozone concentration of 16. 8 mg/L when the flow rate was 0.4 L/min, and original COD value of 430 mg/L. Under the optimum process condition, the BOD5 value was improved by 75.42% at 1 h, and the BODs/COD value was increased from 0.05 to 0.23 after 2 h treatment. The results showed that UV/O3/P25 not only improved the removal of COD and UV254, but also bettered the biodegradability of landfill leachate efficiently.