Ammonium Persulfate Oxidation Remediation Of Organic Contaminated Soil And Study On Electrochemical Regeneration Performance

Persulfuric acid advanced oxidation technology is an emerging advanced oxidation technology that has been emphatically researched in recent years.It has been proven to be an effective soil remediation method that can achieve better mineralization effects with mild implementation conditions and low prices.In order to achieve a good restoration effect,the injection of sul fate into the soil after a large amount of reaction also means a great restoration cost and new ecological environmental risks.Therefore,this article uses electrochemical oxidation to prepare ammonium persulfate,and the sulfate is recycled.The system d esigned in this study is to organically combine the process of preparing ammonium persulfate by electrochemical oxidation of sulfate and the process of activating ammonium persulfate to degrade organic pollutants,so that the waste liquid after the reactio n can be recycled and the whole system can continuously produce oxidant raw materials.This article explores the influencing factors of the electrochemical oxidation process and the activation degradation process,summarizes the factors that affect the implementation of the system,and analyzes the types of free radicals that play a major role in the degradation process,explores the impact of each ion on the degradation process,and explores the feasibility of the recycling system.The final result shows that this experimental device is used for electrochemical oxidation to prepare ammonium persulfate.The volume of cathode and ano de liquid is 100m L respectively.The anode raw material ammonium sulfate concentration is 400g·L^-1,the cathode is set to 20%s ulfuric acid concentration,the voltage is 8V,the electrolysis time is 4h,the mass fraction of ammonium thiocyanate added to the anode is 0.1%.Under these conditions,the concentration of ammonium persulfate produced can reach 18.4m M,and the electrolys is efficiency can reach 4.61%;the optimal ratio of persulfate to activator iron is 1:1 The best p H condition is the original electrolyte p H value,which is 1.3;HA,HCO₃^-,Cl^-have inhibitory effects on the degradation of organic pollutants by activated p ersulfate,while H₂PO₄^-has little effect on the degradation process,and SO₄^2-almost The system has no effect.It can be seen from the experimental results that in the Fe⁰ activated electrolyte system for degradation of phenol,sulfate radicals and hydr ox yl radicals work together to cause the degradation of phenol,and sulfate radicals play a major role under acidic and neutral conditions.But when the p H increases,the role of hydrox yl radicals becomes greater.The research in this paper shows that the cyclic electrolysis process of the waste liquid can continue after the organic pollutants are degraded.At the same time,if the organic pollutants are not completely degraded,the electrolytic cycle process will further treat the incompletely degraded org anic pollutants,which is beneficial to the entire system.The degradation effect of pollutants in the soil experiment is better,which can achieve the purpose of degrading pollutants.At the same time,more ammonium persulfate can be produced after the li quid is activated and degraded and after it enters the electrolysis device again.The overall results show that it can be obtained in the soil medium.The same results as the water medium prove that the soil medium system is feasible to oxidize and degrade organic pollutants by recycling ammonium persulfate.