الفهرس 
Chapter (1) Introduction .Only 14 pages are availabe for public view
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Abstract
The present work are a theoretical and an experimental investigation based on the influence of the main operation parameters on the performance of the RO elements. The theoretical work is experiment is performed in order to measure the total dissolved salts, PH and conductivity of the permeate water when different temperatures and concentrations values for the Feed water. Combined between RO desalination system and heater system would improve the performance of the system as the results which is clarified under the temperature limits to prevent scaling and fouling deposition. Temperature of the feed water is the most noticeable environmental condition affecting the performance of RO systems. The general rule of thumb is to estimate productivity change at 3% per degree Celsius, °C change from the standard of 25 °C. There are equations to provide a more exact estimate of productivity. Pressure is approximated by direct proportionality to productivity. Temperature correction is an exponential function related to the membrane material.The aim of the thesis:In the present work the theoretical and experimental study of reverse osmosis is investigated. The operating parameter on RO system are feed water in, temperature of feed water inlet, input pressure of feed water, and the concentration of salt on feed water. Combined between RO desalination system and heater system would improve the performance of the system under the temperature limits to prevent scaling and fouling deposition. The main aim of the present