Biogas, the metabolic product of anaerobic digestion, is a mixture of methane and carbon dioxide
with small quantities of other gases such as hydrogen sulfide [19,20]. Methane, the desired component
of biogas, is a colorless, blue burning gas used for cooking, heating, and lighting [21]. Biogas is a
clean, efficient, and renewable source of energy, which can be used as a substitute for other fuels in
order to save energy in rural areas [22]. In anaerobic digestion, organic materials are degraded by
bacteria, in the absence of oxygen, converting it into a methane and carbon dioxide mixture.
The digestate or slurry from the digester is rich in ammonium and other nutrients used as an organic
fertilizer