الفهرس 
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Abstract
The study aimed to produce enriched biogas in compliance with the natural gas standard and to achieve a significant contribution to the future energy requirements in Egypt. The study included two variables in the first stage (hydrogen sulfide removal) which are eight gas flow rates (2, 3, 4, 5, 6, 9, 10 and 12 l/min), two depths of the steel wool layer in the purification column (300, 500 mm). The study included three variables in the second stage (carbon dioxide removal) which are four gas pressures (1, 2, 3 and 4 bar), four gas flow rates (2, 3, 4, 6 l/min) and four gas flow rates. Water (4,6,8 and 12 l/min).
Results indicated that an increase in the energy generated from purified biogas was occurred, so the system that was manufactured to purify biogas is very suitable for use in Egypt. The lowest hydrogen sulfide content was 19 ppm at a gas flow rate of 6 l/min and a depth of 500 mm steel wool bed. Thus, the highest value of the hydrogen sulfide removal efficiency was 95.40%. The highest methane content after water purification was 93.86% at a gas pressure of 4 bar, gas flow rate of 2 l/min and water flow rate of 12 l/min. Therefore, the highest value of the methane enrichment efficiency was 65.98%. The lowest contents of carbon dioxide and hydrogen sulfide after water purification were 3.54% and 6 ppm, respectively. The highest heating value was 33.65 MJ/m3 at a gas pressure of 4 bar and a gas flow rate of 2 l/min. The highest generated energy value was 1077 Wh at a pressure of 4 bar, a biogas flow rate of 6 L/min and a water flow rate of 4 l/min. The lowest operating cost was 18.90 L. E/m3 at a gas flow rate of 0.36 m3/h. The study recommended that the purified biogas obtained in the purification system complies with the specifications of natural gas.