MANAGEMENT OF WASTE-WATER IN A LIGHT VEHICLE MANUFACTURING COMPANY IN EGYPT

Wastewater discharged from a light vehicle manufacturing company was the subject of this study. Reduction of Cr VI to Cr III from the electroplating wastewater was carried out, after which the electroplating wastewater was mixed with other industrial and human wastes prior to combined chemical-coagulation-sedimentation treatment. The results obtained showed that the use of lime as a coagulant produced a high quality effluent. To minimize the initial investment and operating costs, combined treatment of the wastewater under investigation and wastes discharged from a near by automobile manufacturing plant was carried out. In this case two treatment schemes were investigated. The results obtained showed that biological treatment via completely mixed activated sludge process removed most of the organic matters. Near complete removal of Cr III and Ni II was achieved. Ammonia was oxidized to nitrate. A final process design was developed. Economic evaluation of the methods adopted indicated that combined wastewater treatment from both companies, using chemical coagulation-sedimentation is recommended.