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Sewage Gas
and Waste Water


Waste water treatment facilities use sewage gas as a fuel source when used in generator sets (gas engines). Through the process of anaerobic digestion, the biogas produced by the waste water digesters used in the water treatment process, is captured and used by the MWM gas engines to power the waste treatment plant. The electricity produced is then exported to the electricity grid, offsetting the sites operational costs.

Recent environmental requirements and process innovations have led to advanced anaerobic digestion where the sewage sludge is pre-treated thermally and/or enzymically before the digestion process. This pasteurises the sludge and increases conversion to biogas. Often the process requires steam for heating and this is produced from the exhaust heat of the biogas CHP engine.

Benefits of CHP for sewage gas

  • Renewable energy generated from a waste material
  • Cost effective, reduces energy costs
  • Export power used as an income generation tool
  • Reduces CO2 emissions

With over 70MWe installed across the sewage and waste water treatment sectors, Edina remains the preferred biogas CHP supplier, installer and maintenance provider on most advanced digestion and anaerobic digestion projects commissioned in the UK.