Study On Treatment Of Fungicide Wastewater Through Fenton Process

This paper first elaborates the current situation of water resources and pollution in China,especially for the pollution of chemical wastewater in China,and summarizes the progress of chemical wastewater treatment technology and pesticide treatment technology.The main work of this paper is as follows:（1）The design of the wastewater treatment process of the fungicide is introduced,especially the wastewater treatment equipment and its function are introduced in detail,and then the pretreatment workers,Processes,removal of heavy metal processes and removal of ammonia nitrogen production process of the basic principles,to explore the basic factors on the impact of wastewater sedimentation factors.Finally,the operation effect of the process is summarized.（2）The effect of H₂O₂concentration,pH value,MnCl₂ concentration,reaction time and FeSO₄ concentration on the removal rate of TOC in waste liquid was studied by orthogonal experiment.The optimum conditions of wastewater treatment were obtained.（3）On the basis of experimental research,the process improvement is realized and the experiment is carried out.The main research contents of this thesis are roughly described as follows:The main contents of this thesis are as follows:（1）The design of the fungicide wastewater treatment process,especially the waste water treatment equipment and its function to carry out a detailed introduction.Then,the basic principles of pretreatment,Fenton reaction,removal of heavy metal and ammonia removal were introduced respectively.Finally,the operation effect of the process is summarized.All the waste water in the pretreatment process is discharged to V-501 and the V-501 is 600m3.The supernatant from R-502C was preheated by the heat exchanger and then introduced into V-530.MnCl₂ and FeSO₄ were added to V-530 to control Fe 250 ppm.530 effluent flows into R-505 and R-506 in parallel,and the Fenton reaction temperature is controlled by steam at 90°C or higher.The wastewater from Fenton was pumped into V-502,and Ca（OH）₂ was added to control the pH to 7 to 9,and 0.1%of the wastewater was added to NaClO to remove the metal ions of the complex in the wastewater（NaClO The amount can be adjusted in the amount of copper in V-503）.The supernatant from the V-504C was pumped into the R-502B via a sand filter V-519A/B,and 0.35%of the wastewater flow of NaCl was added thereto and the pH was adjusted to 7 to 8 with HCl or sodium hydroxide.The treated wastewater is cooled to 35°C below the cooling tower T-520 and then flows into the final effluent vessel V-521,which can be discharged after passing the test.（2）To improve the content of FeCl₃ in the treatment solution and the pH value of the solution to improve the coagulation.The effects of H₂O₂ concentration,p H value,MnCl₂concentration,reaction time and the concentration of FeSO₄ on the removal rate of TOC in waste liquid were studied by orthogonal experiment.The order of addition of H₂O₂ was higher than that of pH>MnCl₂>reaction time>FeSO₄ addition amount.When the reaction time is 25 min and the amount of 20%FeSO₄ is 6 ml/L,the addition of 10%MnCl₂ is 1 ml/L,the amount of 50%H₂O₂ is 7 ml/L,the initial pH of the solution is 3,the removal of TOC The highest rate,reaching 58.24%⁵9.34%.The removal rate of TOC in water increased gradually with the increase of H₂O₂ content.When the 50%H₂O₂content in solution was 7.0 ml,the removal rate of TOC in the supernatant was 51%.（3）When the content of MnCl₂ in the solution is reduced,the TOC content in the solution decreases as a whole,which indicates that reducing the MnCl₂ content in the solution can improve the removal rate of solution TOC.When the content of MnCl₂ in solution decreased,the removal efficiency of R-506 increased from 68.29%to 75.18%,the removal efficiency of R-507 increased from 70.50%to 79.90%,Fenton responded well and the overall TOC removal rate increased by about 9%.When the content of 50%H₂O₂ in the actual production is reduced and the PH value of the solution is increased,the removal rate of TOC is increased from 60.42%to 70.22%,and the degradation ability of waste liquid is greatly improved.The article provides a solution for the reduction of sludge,as well as equipment,which provides a solution for future sludge reduction treatment.