The Research Of Advanced Oxidation Degradation2,4-Dimethylphenol In Water Of Sodium Persulfate

With the development of industry, the Phenolic wastewater has become one ofthe important fields in the enrironmental problems. Phenolic compounds are importantchemical，but it is bad to person or ecosystem，so the treatment of it is pai d moreattention to by all the countries. Traditional advanced oxidation technology is based onthe oxidation technology of the hydroxyl radical （OH）, persulfate oxidationtechnology based on sulfate radical （SO₄^-ï¹'） is just the rise in recent years with goodprospects for development, whici is a new type of advanced oxidation technology,.In order to make the Phenolic wastewater have higher degradation and supply aneffective treatment method, the sulfate free radical on the degradation of Phenolicwastewater was studied. The activation method is currently a hot issue of persulfateoxidation technology research.With the target pollutionts of2,4-Dimethylphenol,theeffects of pH,the initial concentrations of Fe（Ⅱ）, zero-valent iron,UV on thedegradation efficiencies of2,4-Dimethylphenol were studied. Oil shale wastewatercontains high concentrations of polyphenols,using the sulfate free radical whichSodium peroxydisulfate produce to degrate organic pollutants.The experimental results show that：in pH activating sodium sulfate reactionexperiments, with the increase of pH, degradation rate of2,4-dimethyl phenol wasdecreased, when the sodium persulfate concentration was1g/L, pH was3, the highestdegradation rate is97.95%. In Fe2+activating sodium sulfate reaction experiments,when the Fe2+concentration increased, degradation rate of2,4-dimethyl phenol wasincreased and then decreased, when the concentration of sodium persulfate was1.5g/L,Fe2+was1g/L, degradation rate of2,4-dimethyl phenol was99.05%. Inzero-valent iron activating sodium reaction experiments, with the amount ofzero-valent iron gradually increased, degradation rate of2,4-dimethyl phenoldegradation was increased and then decreased, when the amount of zero-valent ironwas1.5g/L, sodium persulfate concentration was1g/L, the highest degradation rate was99.95%. In UV-activating sodium persulfate experiment, when the sodiumpersulfate was1.5g/L, degradation rate of2,4-dimethyl phenol was up to94.98%. Inthese four groups, zero-valent iron activating persulfate experiment, the degradationrate of2,4-dimethyl phenol was best. Dynamic analysis of these four sets ofexperiments, the reaction rate constant is sequentially reduced in accordance with azero-valent iron, Fe2+, pH, and UV, therefore, reaction rate constants in thedegradation kinetics of2,4-dimethylphenol in the zero valent iron in the system washighest.Degradation of organic matter in the oil shale waste water was using zero-valentiron activated sodium persulfate wirh determination of petroleum hydrocarbons andvolatile phenol.The experimental results showed that: when the amount of zero-valentiron was2.5g/L,sodium persulfate concentration was2g/L removal rate of petroleumhydrocarbon was71.5%; when the amount of zero-valent iron was2.5g/L,sodiumpersulfate concentration is2g/L, removal rate of volatile phenol was72.15%. Theresults of GC-MS, compared oil shale raw water with treated wastewater, degradationof effect which was using this method to treat Phenolic Wastewater was best.