الفهرس 
Introduction
DiscussionOnly 14 pages are availabe for public view
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Abstract
The present study was carried out to evaluate the effect of pesticides on aquatic freshwater systems of the River Nile using the method of physio- chemical and biological analysis of agricultural drainage water contaminated. the impact of pollutants on the biosynthesis of zooplankton in the aquatic environment. Then treated contaminated water and organic materials agricultural drainage output using microalgae from Scendesmus sp strain. In order to reduce the environmental impact resulting from agricultural activity on freshwater systems to contamination. This study was conducted at five sites in different delta fields representing Aga town, Talka town, Sherbeen town, Manzala and River Nile sites during winter, 2012 to winter, 2013 collecting water samples for analysis of physical, chemical and scanning neighborhood seasonally throughout the four seasons for a full year. The work of the chemical analysis of agricultural drainage water contaminated with pesticide residues and food. Many statistical programs were used in the analysis of the results obtained, such as (ANOVA, SPSS, COSTAT). The isolated two types of algae Chorella sp. & Scendesmus Sp were found in the study environment. Scendesmus Sp.was more effective and well-tolerated and contaminants so Scendesmus was chosen for the biological treatment process of agricultural contaminants in the samples under study. The results show that the highest values in the physical and chemical properties of water and sediment is Manzala (drainage site), followed by Sherbeen (drainage site) where the lowest values of water and sediment was recorded in Aga town compared to the River Nile. The water-monitoring study confirmed the presence of six organophosphorus compounds in drainage water samples Diazinon, Pirimiphos-methyl ,chlorpyrifos, Malathion ,Tolcofos-methyl and dimethoate. and fungicides pesticide, Metalaxyl and herbicide pesticides, Atrazine. Lake Manzala was highest value of pesticide residues due to increased agricultural activity, but winter season was the lowest pesticide residues value. Zooplankton species were classified in the study sites using multivariate analysis (similarities and coordination) and led to the identification of the Nile River distinct group (less polluting) and Manzala (the highest polluted site). The Sherbeen site is more polluted than the two sites (Aga and Talkha). Application of biological treatment (phytoremediation ) by using microalgae, Scendesmus sp. to remediate pesticides residues in water samples It confirms that the biological treatment achieved a success rate of 99% for the removal of chemical contaminants from water samples.