الفهرس 
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Abstract
The main objective of water treatment for potable water supply is to remove turbidity and pathogens. Water treatment is achieved by a conventional method consisting of the train of processes viz coagulation, flocculation and sedimentation followed by disinfection.
Removal of larger particles from water could be accomplished by setting. Colloidal particles are so small that their removability from water by setting alone may require several years. Moreover, these colloidal particles are stable in water, being able to remain as independent entities within dispersion. Therefore, they are not able to aggregate spontaneously into larger particles that settle down more rapidly. The overall water purification process in Egypt, compact unit plants, is finely tuned to produce water with turbidity below the guidelines of drinking water. In most cases, water with optimum turbidity has also acceptable levels of pollutants. The under taken work is devoted to this point through replacement of mechanical flocculation by hydraulic flocculation. This will aid to implement three stages into one stage. The scientific bases of this system will the criteria of operation will be investigated. The technical and economical feasibility will be studied against the conventional alternative. The present study was performed in a pilot treatment system for a synthetic turbid water with the same characterization of that raw water used in the other treatment plants and follow the same steps of the processes but present sludge-blanket unit combines rapid mixing ( coagulation ), flocculation and setting in a single unit.