Treatment for phenol waste water with sulfate free radical

The oxidation of phenol by potassium persulfate activated with heat and transition metal ion(Fe2+) was investigated.The degradation efficiencies of phenol and COD were 50% and 45% when the ratio of potassium persulfate to phenol was 0.50 heating at 100℃ for 3h.When temperature was at below 30℃ phenol cannot be degraded.Compared with potassium persulfate activated by heat alone, the addition of Fe 2+ can enhance the degradation efficiencies of phenol and COD which was increased by 11% and 8% at 100℃, respectively.In the whole reaction system, pH had a great impact on the degradation efficiencies of phenol.It was demonstrated that potassium persulfate produce more sulfate free radicals in acid conditions, so as to achieve the better removal efficiency.