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Abstract
Environmental problems are deep-rooted, therefore recent development policy is taking place in Egypt•and great attention has been paid towards the environment protection. They have great economic values because they play significant role in the regional economy. These lagoons provide about 6()O/o of Egypt’s total fish production according to the statistics of the Egyptian Ministry of Agriculture.
In this thesis, it has been suggested to use the stabilization ponds system of mono or multi-ce1Is in the natmal shallow lakes. The thesis was based on reaching the best geometrical distribution for the vitalization of theftesh water and using it as a source for irrigation or fish growing site and clean aquatic environment
Stabilization ponds are designed to provide aerobic breakdown of organic matter in wastewater, with significant proportion of the dissolved oxygen provided by photosynthetic algae, and lower anaerobic zone where organic matter is decomposed aerobica1ly. The program, which was selected for this study, is Surface-water Modeling System (SMS) version 7.0. The two-dimensional depth-integrated model of SMS was used in this study to simulate hydrodynamics and water quality.
Maryout Lake has been selected as an application case in this study because for more than 30 years, it has been subjected to pollution due to discharging domestic and industrial wastewater. Hence, applying the investigated model to the Maryout Lake (as an application case) after its verification against the field measurement obtained from . different sources and the most recent projects, ensuring that the model correctly produces the flow patterns in Maryout lake and will correctly predict changes, which will result from converting it into oxidation pond.
Many investigations of the Egyptian lagoons have been made. The majority of these investigations were biological and chemical studies. The hydrodynamic studies, which have been made on the Egyptian lagoons, are considerably few. To the best of our. knowledge, there are no reports mentioning that the Egyptian natural lakes are completely converted to stabilization ponds.