Ferrous Sulphate From Titanium Dioxide Industry in Organic and Inorganic Contaminant Removal from Petroleum Refinery Wastewater

摘要

The capability of FeSO4 in the treatment of petroleum refinery wastewater was studied. The removal/reduction efficiency for color, total suspended solids, turbidity and chemical oxygen demand were calculated. The coagulation-flocculation process can be monitored through the measurement of zeta potential and z-average hydrodynamic diameter. At very low pH, charge neutralization is responsible for the particle aggregation while at high pH, sweep flocculation mechanism is responsible for the particle aggregation. At high pH and high coagulant dosages, FeSO4 formed solid iron (II) hydroxide and colloidal particles were 'swept out' from the wastewater and settled. Response surface methodology was applied to obtain the optimum pH and coagulant dosage. Quadratic models indicated that 623 mg/L of FeSO_4 at pH 11 achieved 73.2% color removal, 96.6% TSS removal, 79.4% turbidity removal and 42.7% COD reduction.