Process Optimization Of Landfill Leachate Treatment By Electrochemical Oxidation Based On RSM Analysis Method

With the implementation of the new environmental protection law and the revision of the Water Pollution Prevention Law,the state has higher requirements for the discharge of leachate from landfills,although most landfills have adopted MBR,SBR,nanofiltration,ultrafiltration and inversion.Infiltration and other processes,but the phenomenon of excessive drainage is still very prominent.The top priority is to improve the biodegradability of the leachate and the standardization technology of biochemical effluent.This study takes the leachate of a landfill in eastern Hubei as an example.On the basis of its treatment process and water quality status survey,the original leachate wastewater generated by landfill and the leachate biochemical treatment effluent are selected as the research objects,of which The raw water of the filtrate is pretreated with iron-carbon micro-electrolysis,and the effluent from the biochemical treatment of the leachate is deeply degraded by the Fenton reaction process.uses the experimental method combining single factor analysis method and RSM analysis method to study the optimal reaction conditions of the above experiment and analyze its comprehensive influence on the subsequent treatment process effect.The main conclusions of the study are as follows:（1）The main treatment process of leachate in a landfill in eastern Hubei is:medium temperature anaerobic+MBR membrane bioreactor+reverse osmosis process,the treatment scale is 300m3/d;The main parameter of the leachate raw water ^isthe COD concentration of 4500-5000mg/L;the main parameter of the biochemical effluent is the COD concentration of 700-1700mg/L.The main problem of is the wide range of water quality,which leads to the problems of biochemical system failure and high processing cost.（2）Conclusion of iron-carbon microelectrolysis of leachate（1）Through a single factor comparison experiment,the best experimental condition is to dilute the original leachate by 5 times In the wastewater adjustment tank),the treatment effect is better.The dosage of the polymerized iron carbon ball is 10.0g/m L,the pH value is 3.0,and the reaction time is 90 minutes.（2）Using the RSM analysis method,through 17 sets of experiments and response surface optimization analysis,the best experimental conditions are initial pH value 2.5,time 61.1min and Fe-C 11.9 g.Under this condition,the COD removal rate is about 24%.（3）Fenton method treatment leachate biochemical treatment effluent conclusion（1）Through a single factor comparison experiment,the best experimental conditions are 30%concentration of hydrogen peroxide dosage 8.0ml,pH 4.0,reaction time 60min The dosage of ferrous sulfate heptahydrate is 9.0g.（2）Use RSM analysis method to determine the best reaction conditions.is optimized through experiments and response surface analysis.The best experimental conditions are initial pH 2.0,time 20.1min and ferrous sulfate dosage 10.9g.Under this condition,the COD removal rate is about80.9%.（4）Combined use of micro-electrolysis and Fenton to treat the experimental wastewater,the analysis of social benefits,environmental benefits and economic benefits shows that the process design has practical application feasibility.