الفهرس 
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Abstract
The main objective of this study is to maximize the benefits of orange pomace by reducing the moisture content to the limit which allows storage of the obtained pomace for a long time and permit utilizing this pomace in a different ways by develop and select the proper condition for chopping the orange pomace for maximizing the efficiency of water removing by pressing process using a laboratory scale hydraulic press unit, testing and evaluating the effect of different levels of applied pressure and holding time on pressing process of orange pomace, studying the effect of Ca(OH)2 pre-treatments on the pressing process of orange pomace, to study the utilization of conduction heating rotary dryer for drying the pressed orange pomace and describe mathematically the effect of heating surface temperature of the dryer on the drying behavior of orange pomace, to develop and select the proper mathematical model which may describe the drying behavior of the pressed orange pomace using the conduction heating rotary dryer and evaluating the final quality of the dried orange pomace in terms of chemical composition and functional properties. The results showed that the higher percentage of the chopped samples size category ranged from 0.84 to less than 5mm resulted in higher moisture extraction efficiency during the hydraulic pressing process, the applied pressure of 123 bar and holding time of 15 min were selected for the moisture extraction process of the pomace samples treated and non-treated with Ca(OH)2. under all levels of applied pressure and holding times the Ca(OH)2 treated samples showed lower final moisture content in comparison with the non-treated samples.Both the heating surface temperature and the drying time had a great effect on the For all levels of heating surface temperature, as the exposure time increased, the difference between the pomace bulk temperature and the heating surface temperature decreased and the heating rate also decreased, The bulk temperature of the dried pomace samples ranged from 66 to 95 oC. The drying constants (kL) , (KH) and constant (A) are increased with the increase of the heating surface temperature.Lewis’s model showed the highest value of coefficient of correlation (r) and the lowest values of chisquare( 2), mean bias error (MBE), root mean square error.