Effect of fenton process [H[2]O[2] / Fe[2+]] on removal of linear alkylbenzene sulfonate using central composite

ABSTRACT

This study investigates the degradation of Linear Alkylbenzene Sulfonate [LAS] in aqueous solution using Fenton's process in a batch reactor [at pH = 3 and 25 Degree C]. Experiments were carried out to survey the effects of the amounts of ferrous sulfate [FeSO[4].7H[2]O] and hydrogen peroxide [H[2]O[2]] on the LAS and COD removal. Central composite design and response surface methods were used to optimize the Fenton oxidation process through examination of three independent operating variables namely oxidant dose [H[2]O[2]], catalyst dose [Fe[+2]] and reaction time., hydrogen peroxide dose ranging from 150 to 750 mg /L and Fe[+2] concentration in the range of 10 -130 mg /L were selected to be examined at different reaction times between 20 and 80 minutes. Models were developed and results shows that the oxidation capacities of H[2]O[2] /Fe[+2] were highly dependent on the concentration of H[2]O[2] and Fe[+2]. Satisfactory decay rates of LAS to lock up biodegradable concentration level were obtained, and in the case for oxidation of 200 mg /L LAS, the optimum values were achieved at 600 and 130 mg/L for H[2]O[2] and Fe[+2], respectively