Fenton Oxidation Efficiency in Removal of Detergents from Water

Document Type : Research Paper


1 Instructor of Environmental Health Eng., Kermanshah University of Medical Sciences

2 Assist. Prof. of Environmental Health Eng., Faculty of Public Health and the Institute for Public Health Research, Tehran University of Medical Sciences

3 Prof., Faculty of Public Health and the Institute for Public Health Research, Tehran University of Medical Sciences.

4 Instructor of Environmental Health Eng., Faculty of Public Health and the Institute for Public Health Research, Tehran University of Medical Sciences


Advanced oxidation processes are associated with the production of very active hydroxyle radicals with a high potential for oxidation of organic compounds. One such process is Fenton process which reacts with ferrous ions in acidic media to produce a hydroxyle radical. It is an oxidation-reduction reaction in which the metallic ion accepts the transfer of one electron. A variety of factors such as pH, temperature, reaction time, and ferrous and H2O2 concentrations may affect the efficiency of the method. In this study, synthetic solutions of anionic LAS and ABS both having wide household and industrial applications were obtained and  used to evaluate the efficiency of Fenton process in the removal and treatability of different concentrations of ferrous and H2O2 for a variety of contact times. Experiments were performed with different concentrations of H2O2 and ferrous iron at a constant pH of 3 in a jar test apparatus  adjusted at 200 rpm and for different contact times (20, 40, 60, and 80 minutes). Results showed that increase in catalyst and oxidant concentrations increased removal efficiency. At a H2O2 concentration of 750 mg/l and a ferrous ion concentration of 130mg/l, 86% of LAS and ABS was removed in 80 minutes. Under these conditions, Fenton oxidation reduced the COD content of the ABS sample from 470 mg/L to 187 mg/L. The BOD5/COD ratio improved by 0.225 for a concentration of 600 mg/L of H2O2 and 130 mg/L of ferrous ion in 60 minuets. Measurements after the reaction revealed that pH reduced from 3 to 2.6 as a result of acidic intermediaries produced; this can be interesting for reaction control investigations.


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