Study On Degradation Of O, M, P-cresol Wastewater By Fenton Reagent And Process Control Of The Basic Research

Phenolic compounds as an important chemical raw materials are widely used in petroleum, coking and other industries.In particular petroleum, coking and gas industry produced the amount of phenolic wastewater and wastewater containing phenol is also high. If the wastewater directly discharged water body will result in serious pollution of the water.Fenton system with its advantages of fast response, high efficient and no secondary pollution are widely used in wastewater treatment.Study on Degradation of o,m,p-cresol wastewater by Fenton Reagent. Poor analysis obtained by orthogonal experiments dosage of H2O2is the most significant impact on the reaction, followed by the initial pH value, addition is [H2O2]/[FeSO·7H2O]. The experimental results show that:when concentration of o, m,p-cresol is100mg/L, the beginning pH value is4, H2O2dosage is1.6mL/L,FeSO4·7H2O dosage is436mg/L, and [H2O2]/[FeSO4·7H2O] is10:1.COD removal efficiency of o,m,p-cresol could reach79.95%,85.46%,83.01%after120min.ORP and COD degradation showing good correlation when Fenton reagent is insufficient. When concentration of o, m,p-cresol is100mg/L, the beginning pH value is4, H2O2dosage is1.6mL/L,FeSO4·7H2O dosage is436mg/L, and [H2O2]/[FeSO4·7H2O] is10:1. ORP plateau can be a batch dosing Fenton, in two dosing50%of the Fenton reagent, o, m, p-cresol wastewater COD removal efficiency can reach88.54%,92.17%and89.97%after120min, they are all greater than one-time dosing of100%of the Fenton reagent.Through the study on kinetics of o,m,p-cresol wastewater by Fenton Reagent when concentration of o, m,p-cresol is100mg/L, the beginning pH value is4, H2O2dosage is1.6mL/L,FeSO4·7H2O dosage is436mg/L, and [H2O2]/[FeSO4·7H2O] is10:1. Degradation of o,m,p-cresol wastewater by Fenton are in line with the second-order equation, and the reaction half-life is o-cresol> phenol> m-cresol.Finally, through the Fenton degradation of o,m,p-cresol spectral and chromatographic studies:when concentration of o, m,p-cresol is100mg/L, the beginning pH value is4,H2O2dosage is1.6mL/L,FeSO4·7H2O dosage is436mg/L, the total fluorescence intensity of o,m,p-cresol were reduced from4043.00au,4387.00au and4149.00a.u. to129,00a.u.,34.80a.u. and74.90a.u., While the three substances in the degradation process of the fluorescence peak appeared with varying degrees of blue shift.ation of the Fenton. GC-MS experiments showed that o,m,p-cresol peak in the Fenton degradation process decreased gradually in the Fenton reaction.m-cresol and p-cresol peaks are disappear the120min,while o-cresol is also a weak peak. Three waste water are all produced main degradation products:2-pentanone during the degradation of the Fenton.