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Abstract
Alexandria is tlie second largest city and main port of Egypt; it lies north west of the Nile Delta. In past, the city was planned to discharge its sewage either by dilution into the sea through Kait Bay outfall and another 20 minor outfalls located along the city beaches or into lake Maryut. These small outfalls were designed to serve as an emergency relief during the rainy season in winter, but actually these outfalls were used to dispose raw sewage to the beach even during the summer season due to overloaded conditions of the sewerage system. Now, most of the collected sewage from the city is pumped to two waste water treatment plants. The first on is the East Treatment Plant with a design capacity of 410,000 m3/d and the second is the West Treatment Plant, which has a design capacity of 175,000 m3/d. Both plants use primary treatment technology and discharge their primary treated effluents into lake Maryut, therefore the discharge of these plants has been resulted in more deterioration of the lake. Accordingly, these plants should be upgraded to produce a satisfactory effluent in compliance with the environmental regulations to protect the lake or to get the benefits of reusing this large quantity of treated effluents.