الفهرس 
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Abstract
The importance of this study arose from the fact that access to safe drinking water and sanitation is now regarded as a universal human right. Another importance is that the River Nile represents the major source of freshwater in Egypt, therefore continuous monitoring of its water quality is of a prime importance for national sustainable development plans. In general, the present study represents an integrated research investigating the Bacteriological properties and water quality at places supplying raw water for Meet-Khamis drinking water treatment plant, which provide potable water to about 2 million capita at Mansoura city Dakahlia governorate, Egypt. The study, lasted over two years from June 2014 until May 2016 period.
The study pointed to the Omar Bek drain, that is one of the largest sources of pollution affecting the Damietta branch of the Nile water, which carries many of the domestic, agricultural and industrial waste.
Three areas were selected on the Nile River near the Omar Bek drain which is 500 meters before the Omar Bek drain and the confluence of the Omar Bek drain with the Nile River and after the Omar Bek drain by 500 meters and was selected three areas of study of the Meet Khamis water treatment plant, a Meet Khamis water plant uptake from the Nile , sedimentation tank and treated water resulting from the plant also two area were selected on the Meet- Khamis distribution system Mansoura University and El- Paqlia village and its reservoirs.
It is perhaps convenient to briefly summarize this research work and outcomes as following;
I- Physical and chemical properties of water.
The investigated parameters include water temperature, pH, turbidity, conductivity, total dissolved salts (TDS), total alkalinity, total hardness, calcium
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hardness, magnesium hardness, chloride, sulfate, ammonia, nitrite, nitrate, DO, and COD.
II- Organic chemical properties of water.
The investigated parameters include Total organic carbon (TOC), Carbamate, Poly aromatic hydrocarbon compounds (PAHs), and Organochlorine pesticides.
III- Bacteriological properties of water.
Bacteria are ideal sensors for microbial pollution of surface water because of their fast response to environment. Bacteriological indicator Total bacterial count, Total coliform, fecal coliform, and fecal streptococcus.
Results showed increase of pollutants in samples collected from the Omer Bek Drain when compared with the Nile River upstream and the downstream. this reflects the highly amount of pollution being delivered to the Nile River, but with a distance of about 18 kilometers, it takes about 8.3 hours between Omar Bek drain and Meet-Khamis water treatment plant uptake which reduced readings and concentration of pollutants that reached to Meet-Khamis water treatment plant uptake but stilled higher than Nile river before Omer Bek drain.
Meet Khamis water treatment plant has the ability until now to completely remove of inorganic, organic, and microbial contaminant, and keeping it in the standard limits.
A study of the quality of treated water through the networks of Meet-Khamis water treatment plant, was well treated water in Mansoura University and also in El-Baqlia village However, a few bacteria, especially Salmonella, were detected as a result of the presence of fractures and attacks on the network and the entry of pollutants by back-pressure. By using water treatment plant small model was found the big difference between the dose alum and chlorine used was observed in the treatment of the
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Nile River upstream water and Nile river at Meet-Khamis water treatment plant, thus saving the percentage of consumption of alum and chlorine up to 20%.