Phenol contaminated petroleum refinery wastewater presents a great threat on water resources safety. This study investigates the\neffect of microwave irradiation on removal of different concentrations of phenol in an attempt for petroleum refinery wastewater\ntreatment.Theobtained results showthat theMWoutput power and irradiation time have a significant positive effect on the removal\nefficiency of phenol. The kinetic reaction is significantly affected by initial MW output power and initial phenol concentrations.\nResponse surface methodology (RSM) was employed to optimize and study the interaction effects of process parameters: MW\noutput power, irradiation time, salinity, pH, andH2O2 concentration using central composite design (CCD). Fromthe CCD design\nmatrix, a quadratic model was considered as an ultimate model (R2 = 0.75) and its adequacy was justified through analysis of\nvariance (ANOVA). The overall reaction rates were significantly enhanced in the combined MW/H2O2 system as proved by RSM.\nTheoptimumvalues for the design parameters of theMW/H2O2 processwere evaluated giving predicted phenol removal percentage\nof 72.90% through RSM by differential approximation and were confirmed by experimental phenol removal of 75.70% in a batch\nexperiment at optimum conditions of 439W MW power, irradiation time of 24.22 min, salinity of 574mg/L, pH 5.10, and initial\nH2O2 concentration of 10% (v/v).
Loading....