Fentonʹs process for simultaneous removal of TOC and Fe2+ from acidic waste liquor Original Research Article

The potential of Fentonʹs reagent for the removal of organic substrates and ferrous ions, which are the main pollutants in acidic waste liquor, was assessed. The optimum molar ratio of H2O2Fe2+ for the removal of Fe2+ was 72–76, which could be indicated by variations of ORP. Under optimal H2O2 dose, the minimum Fe2+ concentration (12–13 mg/l-−1) appeared at 45 min under a pH of 327–450. Under an H202 dose of 95 mg/l−1, nearly 80% of TOC removal was caused by adsorption for a total TOC removal of 49%, and the contribution of oxidation was not over 20%. At 380 mg/l−1 H202, more than 76% of TOC removal was contributed by oxidation, for a total TOC removal of 65%.