SciELO - Scientific Electronic Library Online

 
vol.38 issue4Preparation and characterisation of tamarind 4-hydroxybenzoic acid (THBA) resin and its use in extraction of heavy metal ions from industrial wastewaterSpectrophotometric determination of fluoride in drinking water using aluminium complexes of triphenylmethane dyes author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Water SA

On-line version ISSN 1816-7950
Print version ISSN 0378-4738

Abstract

SAMET, Youssef; HMANI, Emna  and  ABDELHEDI, Ridha. Fenton and solar photo-Fenton processes for the removal of chlorpyrifos insecticide in wastewater. Water SA [online]. 2012, vol.38, n.4, pp.537-542. ISSN 1816-7950.

The degradation of chlorpyrifos in water by Fenton (H2O2/Fe2+) and solar photo-Fenton (H2O2/Fe2+/solar light) processes was investigated. A laboratory-scale reactor was designed to evaluate and select the optimal oxidation condition. The degradation rate is strongly dependent on pH, temperature, H2O2 dosing rate, and initial concentrations of the insecticide and Fe2+. The kinetics of organic matter decay was evaluated by means of chemical oxygen demand (COD) measurement. Overall kinetics can be described by a pseudo-second-order rate equation with respect to COD. The optimum conditions were obtained at pH 3, H2O2 dosing rate 120 mg-min-1, [Fe2+]0 5.0 mM, initial COD 1 330 mg-£-1 and 35°C for the Fenton process. However, in the solar photo-Fenton process, the degradation rate increased significantly. To achieve 90% of COD removal, the solar photo-Fenton process needs 50% less time than that used in the Fenton process which translates to a 50% gain of H2O2.

Keywords : chlorpyrifos; degradation kinetic; Fenton; solar photo-Fenton; COD removal.

        · text in English     · English ( pdf )