الفهرس 
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Abstract
This investigation was carried out to study the removal of five pesticide wastes namely; chlorpyrifosmethyl, fenitrothion, profenofos, pirimiphosmethyl and malathion by using physical, chemical and biological methods. The results clearly showed that generally treatment of solutions containing either chlorpyrifosmethyl, fenitrothion, profenofos, pirimiphosmethyl or malathion using demulsification by Ca(OH)2, sorption by different sorbent materials, i.e. (activated charcoal, newspaper, peat moss, peanut hulls or wood fibers), and filtration by using filter paper were very effective in pesticides removal. Treating the different sorbent materials with vegetable oil clearly improved their removal capacity. chlorpyrifosmethyl was the least pesticide to be removed by using demulsification, sorption and filtration compared with the other tested pesticides. It could be concluded that the residues of all the tested pesticides greatly deteriorated when exposed to direct sunlight especially for long periods. It can be concluded that the rate of removal of the five tested pesticides from aqueous solutions was influenced by many factors, concerning chemical structure, level of hydrolysis concentration of pesticides applied, temperature degrees and period of exposure. In general, increasing temperature degrees increased the rate of pesticides degradation. All tested pesticides showed high degradation rate when exposed to different degrees of temperature (30, 40 and 50(R@(BC) within the period of experiment. The results also indicated that rates of chlorpyrifosmethyl, fenitrothion, profenofos, pirimiphosmethyl and malathion were disappearance substantial when incorporated with liquid suspensions of animal wastes. Differences in response were observed depending upon the kind and concentration of pesticides, in addition variations in waste characteristics.