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*[[Practitioner's Tool / Technology and Operation / Biogas_Systems|Biogas Systems]], [[Biogas Reactor]], [[Biogas Combustion]]: A biogas reactor or anaerobic digester is an anaerobic treatment technology that produces (a) a digested slurry (digestate) that can be used as a fertilizer and (b) biogas that can be used for energy. Biogas is a mix of methane, carbon dioxide and other trace gases which can be converted to heat, electricity or light.