Calif. Gets First Anaerobic Digester to Turn Manure into Biogas

DVOdigester1California gets its first anaerobic digester that will turn manure from a dairy farm into biogas. Wisconsin-based DVO, Inc. announced it has nearly completed work on the anaerobic digester scheduled to open at Calgren Renewable Fuels on September 30, 2014 in Pixley, Calif.

The DVO anaerobic digester, built by Andgar of Ferndale, Washington, is designed to hold approximately 1,400,000 gallons of manure and organic waste. Each day, the digester will receive 55,000 gallons of solid and liquid waste from Four J Farm Dairy, a nearby dairy farm with approximately 2,000 head of cattle.

Biogas, one of the many valuable byproducts of the anaerobic digestion process, will replace thousands of gallons of natural gas currently being used by the Calgren on-site cogeneration facility to produce 55 million gallons of ethanol each year.

Biosolids, another beneficial byproduct of anaerobic digestion, will be sent back to Four J Farm Dairy to be used as a high-quality and low pathogen count cattle bedding. Liquid nutrients from the digestion process will also make its way back to the farm to fertilize growing crops.

DVO officials say the digester will reduce farm waste greenhouse gas emissions by more than 90 percent, while also cutting down on pathogens and odors.

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