Abstract Drainage water provides an integral supplement to Egypt’s water supply

Abstract
Drainage water provides an integral supplement to Egypt’s water supply. As with many countries through the world that have turned to non-conventional sources in the face of freshwater scarcity, the reuse of drainage water is one of the main reasons why Egyptians can use a larger quantity of water than that which flows into the country, falls as rain, and is pumped from deep aquifers each year. The potential health risks and environmental impacts due to wastewater use for irrigation have been well documented. Although pesticides facilitate the anthropogenic land use, they usually cause danger to the biotic species and seriously damage the human living environment . Using natural clay minerals such as bentonite and zeolite for water and wastewater treatment are increasing due to their abundance, low price, and adsorption capabilities, as well as ion exchange that is highly capable of adsorbing all kinds of pollutants for some organic and inorganic compounds, including heavy metals in waters. The objective of this study is to Identify the side effects to which animals are exposed due to exposure to pollution from west Alexandria region through Evaluating the level of selected heavy metals in serum, milk and water samples and comparing the results to globally acceptable standards, Detecting the presence of pesticide residues in water and milk samples, Assessing the effect of the contaminated water on the liver, kidney and heart of sheep for possible prediction of effects on human and Investigate the remediating effect of bentonite . This study was conducted on 30 dry female sheep, age 2-3 years each weighing about 25-35 Kg, randomly divided into 3 groups 10 animals each according to the received water, the control group received fresh tap water , the 2nd group received water from the studied drain and the 3rd group received drain water plus 4 % bentonite . The study revealed that there were marked significant differences between the biochemical parameters of treatment animals when compared to control animals. There is no an elevated risk of E. coli contamination as illustrated by the low frequency of E. coli detected on the water samples. Also prolonged exposure to heavy metals from polluted water can develop serious health problems as a result of excessive accumulation of these metals in the human body through dietary intakes .

Key words : Drainage water , Heavy metals , Pesticide residues, Barki sheep and Bentonite .

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