Definition

The process of treating wastewater results in the production of digester gas, which a methane-rich gas that can be used to both produce electricity and heat the digester tanks, where the gas is produced. Digester gas is increasingly used for these purposes in wastewater treatment plants due to the benefits gained. The plant can reduce its consumption of both grid electricity and fossils fuels to supplement digester tank heating needs. In some instances, wastewater treatment plants have even become energy independent, providing all their own needs.

As shown in the table below digester gas tends to be around 60% methane, the balance carbon dioxide. In comparison with landfill gas, it tends to be more consistent in quality.

Type of Gas                    Digester

Methane                            60%

Carbon Dioxide                   40%

Nitrogen                             0%

Oxygen                               0%

Total                                 100


More information on digesters and wastewater treatment can be found at the following websites:This gas contains Siloxanes, a consumer chemical that can foul combustion equipment. While gas turbines have demonstrated reliable operation over the years, Solar does have recommendations regarding the use of gas turbines in these applications. .

 

US EPA’s Wastewater Technology

Water Environment Federation
 

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