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Catalytic thermolysis of petroleum refinery wastewater was investigated as a pretreatment process. Effects of various parameters like temperature, pH, dose of catalyst and time were investigated for chemical oxygen demand (COD), turbidity, and element reduction. CuSO 4 , FeSO 4 , FeCl 3,  and 1:1 ratio (v:v) mixture of CuSO 4  and FeCl 3  were used as a catalyst. The maximum reduction of COD and turbidity were 90 and 98% by mixture (1:1) of CuSO 4  and FeCl 3  at 70 °C, 7 pH, 1.0 kg/m 3  dose in 90 min reaction time. The removal of an element like Cr, Mn, Ni, and Pb was analyzed by ICP-OES. The sludge precipitated after catalytic thermolysis was characterized using scanning electron microscopy with energy dispersive X-ray analysis (SEM-EDX), Fourier transform infrared (FTIR) and thermo-gravimetric analysis (TGA)/derivative thermal analysis (DTA) analyses. Sludge from CuSO 4  and mixture of CuSO 4  and FeCl 3  treatment has a compact structure with irregular granule which favors adsorption.

Catalytic thermolysis treatment of petroleum refinery wastewater collected from effluent treatment plant