EFFECT OF FENTON PROCESS (H2O2 / FE2+) ON REMOVAL OF LINEAR ALKYLBENZENE SULFONATE (LAS) USING CENTERAL COMPOSITE DESIGN AND RESPONSE SURFACE METHODOLOGY

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°C). Experiments were carried out to survey the
effects of the amounts of ferrous sulfate (FeSO4.7H2O) and hydrogen
peroxide (H2O2) 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 (H2O2), 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 H2O2 /Fe+2
were highly dependent on the concentration of H2O2 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 H2O2 and Fe+2,
respectively.