Study On The Treatment Of Landifill Leachate By The Combined Technology Of Ultrasound, Catalytic Oxidation And Biotreatment

The study target in this study is landfill leachate. After much study of all kinds of ways about treatment of landfill leachate, which we know, and based on the former researching of this project, we designed a combinatorial means of ultrasound, catalytic oxidation and bio-treatment, which show the two merit of ultrasound catalytic oxidation and bio-treatment.The property of landfill leachate in this experiment is 37000~39000mg/L of COD and 2800 mg/L of NH3-N. The content of experiment include: (1) the study of ultrasonic treatment of landfill leachate; (2) the study of ultrasonic catalytic oxidation of landfill leachate; (3) the study of bio-treatment through pre- treatment.with energy density of 11. 94 w/cm2, the initial PH value of 7, temperature of 55℃, initial concentration of organic components of 37000mg/L, through 240 min ultrasonic treatment, the experiment was capable of COD removal efficiencies exceeding 64% . the mechanism was dominated by the reactions between . OH radicals of the bulk solution and thermal decomposition in cavitations bubbles. The decomposition process is in line with the "equation of pseudo first-order kinetics. From my experimental data, I got a reactionrate equation:C=36026.14e0.0042t,R2=0.981. With catalyst of FeS04, microgalvanolysis material of activated iron-chipping, energy density of 11.94 w/cm2, PH value of 5.5, temperature of 55℃, initial concentration of organic components of 37000mg/L, through 240 min ultrasonic treatment, the experiment was capable of COD removal efficiencies exceeding 81% . with PH value of 9. 5, temperature of 55"C, the experiment of blowoff was capable of NH3-N removal efficiencies exceeding 82% .After the pre-treatment, the landfill leachate was treated by SBR. With the reaction phase : water intake of 0. 5h; anoxia stirring of 0. 5h, aeration of 6~8h; anoxia stirring of 0. 5h;water outtake of 0. 5h, MLSS of 3500, sludge load of 0. 3kg/kg.d, aeration volume of 170L/h, the effluent concentration of COD and NH3-N was around 34mg/L and 400mg/L, which accorded with the demandof GB16889-1997.