Abstract
Izmit Bay is located at the eastern end of the Sea of Marmara. The Sea of Marmara is an important adjacent area to the Mediterranean Sea. The extent of pollution in the Bay is increased beyond tolerable levels mainly due to substantial and unplanned growth of a large spectrum of industrial activities. A comprehensive project for the prevention and elimination of pollution in Izmit Bay is realised. The assessment of pollution from land‐based sources was the most significant step in this project. The study revealed that the Bay receives a total municipal wastewater flow of 70 000 cu m/day and a total industrial waste discharge of 120 000 cu m/day. The total BOD load was noted to be subdivided as 30 000 kg/day and 75 000 kg/day between municipal and industrial sources respectively. Similar figures were also computed for all the other parameters including nutrients and heavy metals. The evaluation showed that the eastern part of the Bay receives more than 70% of the total pollution load.
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