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Effect of the chemical coagulation on the outlet of the refinery effluent

Shaban G.Elosta, Farag Z.Shtewi

Effluent of the Zawiya Refinery was analyzed for the estimation of oil and organic matter contents, suspended solid and biological oxygen demand. For reducing the level of above mentioned pollution parameters in the effluent, some chemical coagulants and coagulation aids were tried. From the experiments it was found that the AluminumSulphateOctadecahydrate in combination with either activated silica or bentonite clay, each in the ratio of 5 mg/L when added in the effluent samples, brings reduction in the concentration of oil and organic matter contents, suspended solid and biological oxygen demand up to 90%, 80%, 70% respectively. All the above experiments were carried out at the laboratory scale.