Treatment Of Industrial Landfill Leachate By Coupling Process Of Electroflocculation And Electrochemical Oxiadtion

With the acceleration of my country’s modernization process,the scale and production capacity of chemical,pharmaceutical and other industries are increasing day by day,and the total amount of industrial waste generated by enterprises in related industries is also increasing year by year.Industrial waste is classified as hazardous waste due to its high biological toxicity.The leachate produced by industrial waste has high salt content,many toxic pollutants,poor biodegradability and other water quality characteristics,which makes it difficult to effectively treat industrial landfill leachate by biochemical methods.Rapid and efficient treatment technology has become an urgent problem to be solved in industrial landfill leachate treatment.The research on the treatment method of industrial landfill leachate in this thesis will help to improve the traditional reduction mode of membrane filtration-concentrate recharge,and provide a simple and harmless treatment scheme for the concentrated solution after membrane filtration.In this study it was found that the treatment of industrial landfill leachate by Fe,Al synergistic pulse electroflocculation Ti/Ru O₂-Ir O₂electrochemical oxidation coupling process can achieve the simultaneous removal of Chemical Oxygen demand(COD_Cr),Ammonia nitrogen（NH₄⁺-N）,and Total phosphate（TP）.The removal efficiency of TP is higher,and the electrochemical oxidation has better removal effect of COD_Crand NH₄⁺-N.By exploring the electrochemical conditions of electrocoagulation and electrochemical oxidation treatment of industrial landfill leachate,it is concluded that Fe and Al electrodes are used in electrocoagulation,the electrode spacing is 1.0 cm,the electrolysis voltage of iron electrode is 2.0 V,the electrolysis voltage of aluminum electrode is 2.5 V,the commutation time of iron electrode is 20 s,and the commutation time of aluminum electrode is 10 s;In the electrochemical part,Ti/Ru O₂-Ir O₂electrode was used,the electrode spacing was 1.5 cm,the electrode voltage was 10 V,and the commutation time was 20 s,which had a good treatment effect on industrial landfill leachate.The dynamic test results show that:for the leachate water quality COD_Cr:1102mg/L,NH₄⁺-N:980.5 mg/L,TP:19.3 mg/L,after running for 5.0 hours at a flow rate of 1.5 L/h,the effluent COD_Cr:454 mg/L,NH₄⁺-N:2.8 mg/L,TP:4.9 mg/L,the results meet the requirements of downstream sewage treatment plants for leachate water quality COD_Cr:500 mg/L;NH₄⁺-N:20 mg/L;TP:5.0 mg/L acceptance limit requirements..The dynamic test device is enlarged,and an integrated water treatment device with a treatment capacity of 100 m³/d is designed.There are six treatment units including industrial landfill leachate storage tank,electrocoagulation reactor,primary sedimentation tank,electrochemical oxidation reactor,secondary sedimentation tank,and discharge pool.The integrated water treatment device can meet the enterprise’s demand for an industrial landfill leachate treatment capacity of 100 m³/d,and the effluent water quality after industrial landfill leachate treatment is expected to meet the water quality acceptance requirements of downstream sewage treatment plants.The enterprise adopts the integrated industrial landfill leachate treatment device,which can reduce the cost of industrial landfill leachate treatment.