Pretreatment Of Leachate By Micro-electrolysis In Intergrated Equipment

Electrochemical treatment of wastewater has the characteristics of high energy consumption, high cost, limited application in the industrial field. Study on micro electrolysis, provides an effective means for innovative wastewater treatment. The three dimensional electro catalytic micro electrolysismethod has the advantages of low cost, high efficiency, strong applicability etc.Different from the traditional two-dimensional electrode three-dimensional electrode, the electrode material is mainlyfilled in the traditional electrodes, energized by electrostatic induction principle, forming potential with the original electrode, forming the "third pole".The thesis has made a wide range of researches on the electrode type, DC voltage micro-electrolysis power supply design, hydraulic characteristics, air compressor model selection and aeration patterns related to landfill leachate pretreatment with trial-manufactured 3D electric catalytic micro electrolysis integration equipment. Experiment has analyzed the changes of CODCr landfill leachate indicator, NH3-N and chroma before and after pretreatment, and researched the effects of the operational parameters of the standing time, plate voltage, electrodes switching cycle, aeration rate upon pretreatment effects.The thesis aims to study hydraulics design parameters and cell structure process, check and select trial-manufacture material to produce 3D electric catalytic micro-electrolyzer main equipment; based on the three adjusting devices of voltage, electrode inversion and operation time, develop 3D electric catalytic micro-electrolysis power supply; calculate O content in solution, design trial-manufacture reverse flow aeration device by use of the qualified air compressor; design single-factor experiment scheme to examine the effects of the standing time, polar plate voltage, electrode switching cycle and aeration rate upon on landfill leathate pretreatment effect; design orthogonal experiment scheme and analyze the importance degree of the affecting factors to identify the optimal operational parameters of 3D electric catalytic micro-electrolysis integration equipment.The test has acquired the optimal operational parameters of the 3D electric catalytic micro-electrolysis integration equipment, under the conditions of 5—8mm grain size of the third-pole iron carbon filler, 1:1 volume ratio and raw water PH, the parameters as such: 120 min standing time, 30 v voltage, 30 s electrode switching time, 2000L/h aeration rate, 41.38% CODCr removing rate, 24.52% NH3-N removing rate and 60.00% chroma removing rate. After many tests, it is proved that the self-made 3D electric catalytic micro-electrolysis integration equipment operates in a steady mode and has some pretreatment capacity for landfill leachate, which can offer some reference to related sewage treatment engineering design.