الفهرس 
Benefits of orange peelsOnly 14 pages are availabe for public view
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Abstract
The current study was carried out to test and evaluate the possibility of maximizing the benefits of some food processing residuals (orange peel).A cutting and pressing machine was designed and fabricating for conducting the experimental work the following parameters were investigated; three speeds of cutting for serrated knives 1000, 1200and 1400 rpm (9.42, 11.304 and 13.188 m/s), three knives number 6, 8 and 10 and three screw speeds (60, 80 and 100 rpm. The parameters taken into consideration to investigate the performance of the developed included machine productivity (Kg/h), percentages of cutting length (%), energy requirements (kW.h/Mg) , operating cost (L.E/Mg), percentage of oil and percentage of pectin. An infrared dryer was assigned for drying the samples of orange peel while drying behavior was simulated using two different models (Lewis and Henderson Pabis). The obtained results indicated that the highest values of machine productivity for orange peel waste were 165.108 Kg/h. The minimum values of energy requirements and operating cost for orange peel waste were 73.50 kW.h/Mg and internal rate of return (IRR) without sensitivity analysis and with sensitivity analysis ( 90 , 37%), respectively. These results were obtained under the following conditions; knives speed 1400 rpm (13.188 m/s), 10 knives number and screw speed of 60 rpm. On the other side, the highest percentage of highest values of cutting length for orange peel waste < 0.5 and 0.5 - 1cm were 60.24 and 39.69% respectively. These values were obtained at knives speed 1400 rpm (13.188 m/s), 10 knives and screw speed 60 rpm. The highest percentage of oil and pectin were obtained at cutting length for orange peel waste similar operational conditions. The Lewis model considered more proper for describing the drying behavior and predicting the changes in moisture content of orange peel in terms of precision and application simplicity. In general the optimum operational condition for the developed cutting and pressing machine was at knives speed 1400 rpm, 10 knives and screw speed of 60 rpm.