York City's 275th Anniversary

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Anaerobic Digestion

The solids that are removed from the Primary Treatment and Secondary Treatment processes are sent to one of three ANAEROBIC DIGESTERS(a biological step that occurs in the absence of oxygen). During this digestion, bacteria convert any remaining organic matter(food) into METHANE GAS, carbon dioxide, and water. After a detention time of 20 to 30 days at 98 degrees F., the sludge is considered stabilized and is ready for dewatering.

The methane gas is captured and used to produce electricity in our Co-generation facility. The sludge is dewatered and disposed of on farmer's fields by an outside contractor.


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