Study Of Methomyl Wastewater Treatment By Strong Chemical Oxidation + Biochemical Method

The treatment of pesticide wastewater become one of organic industrial wastewater governance problems,with its high concentration and toxicity,high salinity,complex components,refractory and fluctuation of water properties.Pesticide wastewater discharged directly,willseverely undermine the ecological of ground and surface water,as well as a serious threat to human health and the environment.The subjects choose methomyl wastewater from one of pesticide enterprises in Jiangxi province as the object of study,according to the characteristicsof this wastewater,explore a more feasible application of wastewater treatment technology.Eventually,using micro-electrolysis-Fenton+ozone oxidation + biochemical combined process method.It showed that wastewater was improved the biodegrad ability of waste water by chemical oxidation,and eventually can be discharged up to standard after biochemical method.Under the conditions of pH value 2-3 and reaction time 5h,by Fe-C micro-electrolysis and methomyl wastewater in COD can be dropped from 36000mg/L to 25500mg/L.Though COD removal rate is about 29%or so,effluent concentrations are still very high and there is greater toxicity of waste water.The pH value is about 3.0,H2O2 dosage for 0.088mol/L wastewater by Fenton oxidation 2.5h,COD could be dropt to around 18800mg/L.COD removal rate is about 25%,but the water still has a certain effect on microorganisms.With the reaction time prolonged,COD removal increased after ozone oxidation and decomposition,but the speed of degradation will be effected by the influent pH value and reaction time.Consider aspects of engineering economy and application to determine ozone oxidation best pH value is about 10,oxidation reaction time of 60min and COD removal rate is about 15%finally.By micro-electrolys-Fenton+ozone oxidation combined process treatment of wastewater,totally eliminate the toxic for microorganisms.Reusing wastewater by anaerobic and aerobic biological treatment,can reach of emissions standards.Using the combined process of methomyl wastewater treatment is effective,economic and technically feasible.The technology can also be used for highly concentrated refractory and toxic industrial wastewater treatment,is valuable for engineering applications.