Investigation Of Typical Organics For Activate Persulfate Degradation

As soil and groundwater pollution is beco ming more and more serious,organic pollution of soil and groundwater has become one of the most important pollution.The technology of activating persulfate to degrade organic pollutants is a kind of advanced oxidation technology which has been used in recent years in situ chemical remediation for soil and groundwater pollution.The research contents of this paper are divided into two parts.The first part uses phenol as the target pollutant to simulate the process of activating persulfate to degrade organic pollutants in aqueous system.The effects of reaction temperature,initial pH value,pollutant concentration,oxidant dosing amount,water anion and humic acid on phenol degradation were discussed.The results showed that the temperature and initial pH had great effects on the degradation of phenol by persulfate,the degradation rate of phenol could be improved by the addition of oxidant dosage.Other anions and humic acids have different effects on the degradation of phenol,CO₃^2-and PO₄^3-enhanced the degradation of phenol in aqueous system,the degradation of phenol was promoted by the addition of SO₄^2-,NO₃^-,H₂PO₄^-,Cl^-at higher concentrations,while supressed at lower concentrations,other anions inhibited the degradation of phenol.Moreover,the presence of halogen ions in the reaction system makes it easy to produce a trace of halogenated hydrocarbon,resulting in secondary pollution.The second part of this article studied the diesel oil conta minated soil restoration experiments.The results showed that sodium percarbonate and persulfate have a significant effect than other antioxidants.Sodium percarbonate is unstable and susceptible to decomposition in water,so persulfate used more in practice.The results showed that 5%sodium persulphate and 0.5%sodium hydroxide had a degradation of62%after 60 days of diesel conta minated soil with initial concentration of 5000mg/kg.When the ratio of ferrous ions and CA is 10:1,5%sodium persulfate has a degradation of 60%after 60 days.The change of soil TPH was very small after 90 days,which may be that the oxidative dosage limited the degradation of pollutants.