Fenton法与超临界水氧化法联用处理垃圾渗滤液研究

APPLICATION OF FENTON METHOD AND SUPERCRITICAL WATER OXIDATION PROCESSES FOR LANDFILL LEACHATE TREATMENT

研究了Fenton法和超临界水氧化法（SCWO）处理垃圾渗滤液的效果,并将Fenton法作为预处理方法和深度处理方法分别与SCWO联用处理垃圾渗滤液,探索其对提高渗滤液中主要污染物COD、NH3-N、色度的去除效果。结果表明,Fenton法作为预处理方法和深度处理方法分别与SCWO联用,2种联合方式均能显著提高各污染物的去除率。但Fenton法作为预处理方法效果优于作为深度处理方法,2者联用,在Fenton法适宜p H为4、n（H2O2）：n（Fe2＋）=4：1、反应时间2 h,SCWO适宜温度440℃、压力26 MPa、过氧量K=3.0时,COD、NH3-N和色度去除率分别可达到95.8%、71%和99.5%,对NH3-N的去除效果比单一的SCWO显著提高。Fenton法联合SCWO处理垃圾渗滤液比单一采用SCWO运行成本可节约15%~20%。

The combination of Fenton method and supercritical water oxidation process on treatment of landfill leachate was studied, and supercritical water oxidation processing could be integrated with Fenton method either in pretreatment or deep processing procedures. The removal rate of COD, NH3-N and the chroma of the landfill leachate was investigated. The results showed that the combined use of two methods could significantly improve the removal rate of pollutants. In comparison, Fenton method as a pretreatment method was better than as a deep processing method. It showed that the optimum conditions for the Fenton method was pH=4, n（H2O2）：n（Fe2＋）= 4：1, and reaction time was 2 h. And the optimal conditions for the supercritical water oxidation process was θ=440 ℃,p=26 MPa, and K=3.0. Under this condition, the removal rate of COD, NH3-N and the chroma of the landfill leachate was 95.8%, 71% and 99.5%, respectively, indicating the combined process displayed higher efficiency for NH3-N removal than single supercritical water oxidation. In comparison to supercritical water oxidation process, the cost that combined the process of Fenton method and SUlaercritical water oxidation in thetreatment of landfill leachate had decreased by 15%-20%.