The bacteria feed on the initial feedstock from where they obtain their nutrients. This feedstock undergoes varying processes during which it is changed to immediate molecules, namely: â€œhydrogen, sugars, and acetic acid before the final conversion to biogasâ€ (Khopkar, 2004). Anaerobic systems operate in the absence of oxygen. This is made possible by physical containment of the process in sealed tanks. As a result, gaseous oxygen is not permitted to get into the systems. The input material is comprised of components (inorganic oxides or organic material) that act as the main source of oxygen for the anaerobes. The process of obtaining oxygen from the organic material within the initial material leads to the formation of â€œaldehydes, organic acids, alcohols, and carbon dioxide as the intermediate end-productsâ€ (Khopkar, 2004). The conversion of the intermediate end-products to final end-products that include: carbon dioxide, methane, and traces of hydrogen sulfide, is governed by the presence of methanogens. Methanogenic bacteria are responsible for the conversion of chemical energy, present in the initial material, to methane (Massoud & Abrishamchi 2005).
The anaerobic digestion process takes place in four stages (Khopkar, 2004):
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