Biogas produced from anaerobic digestion typically consists of a mixture of methane 55% - 70% (CH4), 30% -45% carbon dioxide (CO2), and traces (0% - 2%) of ammonia and approximately 500 ppm hydrogen sulfide (H2S) [4] [6] [20] [23]. The energy content of methane gas that is produced from manure is around 4800 - 6700 blue flame is an indication of high quality biogas. Cow manure has been selected for investigation in this study because only small-to-large scale dairy farms exist in Jordan, thus, the quantities of cow manure produced daily deemed sufficient to install a biogas unit. Furthermore, the hot arid climate of Jordan provides optimal temperatures for the anaerobic digestion. In experimental study by Aoki et al. [26] a 60 m3 capacity digester operating with dairy manure at a digester temperature of 55˚C, average loading rate of about 7 kg/m3/day and hydraulic retention time of 13 days, the average biogas production was 150 m3/day with 56% methane content in a cold region in Japan.