Abstract
With a growing global population and the constant striving for prosperity, comes a growing demand for energy. Biogas and its upgrading to biomethane are prosperous and sustainable energy sources that even allow the use of the natural gas infrastructure. Biogas production using different bacterial cultures for wastewater treatment can be decentralized and without high costs. This aim of this research is focused on the co-digestion of wastewater biosolids and bacteria from a commercial activated sludge reactor, and customary bacteria used for the treatment of septic systems sludge. The research was performed with a designed laboratory anaerobic fermentation system at 35-40°C (95-104°F).
 The biomass-gas turnover rate is on average 170 l/kg for activated sludge reactor bacteria and 100 l/kg septic system bio bacteria.
 The application of wastewater treatment bacteria as basis for anaerobic fermentation can be considered beneficial for biogas production within wastewater treatment plants.
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