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Abstract
Fenton advanced oxidation processes (AOPs) have been examined for their effectiveness at degrading sodium dodecylbenzene sulfonate (SDBS).Central composite design (CCD) of experiments was used to study the effect of process parameters on oxidation of pollutant compounds. The concentrations of SDBS and H2O2 and pH were the independent variables. Experiments were performed at initial concentrations of SDBS 0.5, 1.5 and2.5 mM, initial concentrations of H2O2 0.5, 1.5 and 2.5 mM and pH of 2, 3 and 4. A regression model was used to assess the influence of these independent variables on chemical oxygen demand (COD) removal. Analysis of variance (ANOVA) of the data and the regression model showed that H2O2 and UV irradiation had significant effects on COD removal.COD of the water decreased significantly with increasing the concentration of hydrogen peroxide. The negative coefficient of this variable (pH) indicated that level of the COD removal decreased as the pH increased from 2 to 4. Quadratic models were predicted for the response variable, i.e. COD removal, and the maximum model-predicted removals was38.48%. Optimum conditions for this wastewater treatment was obtained based on the performance of the Fenton's oxidation in the experiment where the initial SDBS concentration was 1.68 mM and the H2O2 initial concentration and pH were 2.27 mM and 3.77, respectively.
Highlights
Linear alkylbenzene sulfonates (LAS) was introduced in the early sixties as the readily biodegradable replacement for the poorly biodegradable highly branched tetrapropylbenzene sulfonate
The results obtained from applying Central composite design (CCD) as described earlier, were examined by the analysis of variance (ANOVA) to assess the ‘‘goodness of fit’’
The following fitted regression models were used to quantitatively describe the effects of initial concentration of sodium dodecylbenzene sulfonate (SDBS) (A) and H2O2 (B) as well as pH (C): Y=33.72+1.35A+2.41B-0.95C+3.99AB+4.19AC+5.92BC16.26A2+2.58B2-3.87C2
Summary
Linear alkylbenzene sulfonates (LAS) was introduced in the early sixties as the readily biodegradable replacement for the poorly biodegradable highly branched tetrapropylbenzene sulfonate. LAS are generally regarded as biodegradable surfactants but removal of them from wastewater has generally been restricted to conventional biological treatments. Their presence in municipal wastewater is variable depending on their use in industrial processing in addition to domestic activities. Various forms of AOPs have been investigated for treating wastewaters containing refractory compounds These include the use of ozonation [6],TiO2 photocatalysis[7], Fenton oxidation [8], wet air oxidation[5, 9, 10] and electrochemical treatment[11]
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