[Removal of humic acids by oxidation and coagulation during Fenton treatment].

Simulated high concentration humic acids (HA) wastewater was treated by Fenton process. The influence of reaction time, initial pH, H2O2 and Fe2+ dosage on the reduction results of COD, TOC, UV254, A400 are presented. The changes of mean oxidation state (eta), A465/A665, the ratio of COD removal by oxidation to that by coagulation (phi) and Zeta potential (zeta) were used to evaluate the roles of oxidation and coagulation in reducing HA during Fenton treatment.