Wastewater Treatment

LGVSD  primary and secondary biofiltersThe District's treatment plan uses a two stage biofiltration process followed by ammonia removal and filtration. Before discharge the treated sewage is chlorinated to kill bacteria and then dechlorinated to remove the chlorine toxicity.

The solids removed by the process are digested by organisms that feed on organic matter in the sewage. The methane gas produced by the digesters is used in an engine generator to produce electricity, and the waste heat from this cogeneration is recovered to heat the digester.

For a detailed diagram of how it all works, download the following Adobe Acrobat PDF file:
Detailed Plant Diagram (Adobe Acrobat PDF, 27 Kb)


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300 Smith Ranch Road
San Rafael, CA 94902

Phone: (415)472-1734
Fax: (415)499-7715