Advanced Treatment Of Landfill Leachate By Heterogeneous Catalytic Ozonation Oxidation

The solid catalyzer in heterogeneous catalytic ozonation oxidation can be easily separated from the teated wastewater. Using heterogeneous catalytic ozonation oxidation will avoid the loss of catalyzer and the introduction of other metal ion. So heterogeneous catalytic ozonation as an advanced oxidation process has a bright future.The leachate in this research is effluent after biological treatment in Shuang Kou landfill, water quality is as following: COD=790~1600mg/L, BOD=30~100mg/L, ammonia nitrogen=410~540mg/L, pH=8~9, chroma is 1100~2300PCU. And there are three parts in this research.The first part, powder CuO is used as catalyzer in catalytic ozonation oxidation to treat the landfill leachate.The effects of some reaction conditions on the removal efficiency of organic matters and the reaction kinetics are studied in this part.The optimum reaction condition is at normal temperature, pH=8, CuO dosing at 0.1g/L, ozone flow at 6.72mg/min,time of 120min. The catalytic effect is quite well, the removal efficiency of COD and TOC reaches 74% and 68% separately at 180min. In addition, this process is suitable for treating the leachate with low COD. The concentration of chlorine ion have some negative influence on treatment performance, but not very significant. So this process is also suitable for treating the leachate with high salinity. The reaction kinetics equation is got from experiment data, and it is proved right by verification test.The second part, using globularity active alumina as catalyzer, fill it in the reactor for repeated treatment. The effects of some reaction conditions on the removal efficiency of organic matters are studied in this part.The optimum reaction condition is at normal temperature, pH=8, ozone flow at 6.72mg/min,time of 120min. The catalytic effect is quite well, the removal efficiency of COD and TOC reaches 70% and 68% separately at 180min.The third part is catalytic ozonation-PAC absorption experiment. Treat the landfill leachate by catalytic ozonation process for 30min using CuO as catalyzer, then carry on the absorption test with PAC. The optimum PAC dosage is 3g/L, absorption time is 30min. The effect of this process is also quite well, and this process can reduce the treatment time.