Treatments Of Landfill Leachate With Fenton Reagents And Dyeing Wastewater With NaClO Catalyzed By Complex Metal Oxide Catalyst

Landfill leachate is one kind of toxic organic wastewater with high concentration, which produced in the process of refuse disposal. There still have much refractory contaminant in the leachate after the biochemical treatment and the effluent can't meet relevant standards. To meet standards, the advanced treatment of landfill leachate is required. We used Fenton reagents to advance treat the landfill leachate. The optimum process conditions for treatment of landfill leachate by Fenton reagents are achieved. Just as follow: the initial pH value of 5, FeSO4 dosage of 40 mM, H2O2 dosage of 60 mM and reaction time of 3 h. This study brings forward the ideas of adding Fenton reagent for two parts and adding three times the Fenton reagents with the optimum process conditions for the first time with 70% and 80% of COD removal efficiency. With 80% of COD removal efficiency, COD is reduced from 2400 mg/L to 488 mg/L, and the chemical reagent cost is 8.8 yuan/t.With rapid development of dye process, treatment of dye wastewater is more and more difficult due to tens of thousands of dye categories. In this paper, we synthesizes a new type catalyst metal compound oxide, CuMgFe-4, then use this catalyst to degrade MO, MB, RhB and dye wastewater concentrate with NaClO as oxidant. The results show that CuMgFe-4 is a novel catalyst with its good catalytic performance, which is nontoxic and whose raw materials are low cost. With CuMgFe-4 as catalyst and NaClO as oxidant, the COD of dye wastewater reduces to 50 mg/L, the COD removal efficiency is 82% and chroma removal efficiency is 100%. With NaClO dosage of 50.8 mM, COD is reduced to meet the second grade of the national emission standard, and the NaClO cost is 15.2 yuan/t. With NaClO dosage of 4.4 mM, COD is reduced to meet the first grade A of the national emission standard, and the NaClO cost was 1.3 yuan/t. In the fixed bed test, the lifetime of catalyst can be extended to 4 d with 3000 mL dye wastewater degrading, about 80% of COD removal efficiency and 100% of chroma removal efficiency.