anaerobic digesters – Enviro Updates

Mary Callahan, THE PRESS DEMOCRAT

A four-year effort to bring green waste recycling back to Sonoma County has collapsed, scuttling hopes of restoring any time soon a high-volume, locally based compost operation to supply farmers, landscapers and backyard gardeners.

The breakdown came late last month after the company chosen to work with the county waste agency withdrew from negotiations after it failed to secure financing.

The company, Renewable Sonoma, and its principal, Will Bakx, terminated negotiations with the county agency and the city of Santa Rosa after 2½ years of trying to shore up plans for a high-tech composting facility that would convert food scraps and yard waste into valuable agricultural products. The project, estimated to cost $52 million, also was to produce biogas to help power treatment equipment on land leased at the city’s Laguna Wastewater Treatment Plant on Llano Road.

Bakx, whose proposal ranked first among nine pitches considered by the county in 2018 for siting and construction of a modern compost facility, said he had to pull the plug on negotiations because he couldn’t put together funding after talking with a variety of investors. He said he was not at liberty to disclose details.

Kevin McCallum, THE PRESS DEMOCRAT

Every week, hundreds of thousands of Sonoma County residents dutifully gather grass clippings from their yards and food scraps from their kitchens, toss them into green bins and then cart them to the curb alongside their garbage and recycling.

Tons of this so-called “green waste” is then hauled, at a cost of $5 million per year, to other counties, where it is chopped up, often mixed with chicken guts, encouraged to rapidly decompose, and then sold as compost.

The process takes place entirely outside Sonoma County — mostly in Mendocino, Napa and Marin counties — ever since Sonoma Compost, the county’s longtime compost operation atop the Central Landfill, was shut down nearly three years ago for wastewater violations.

Now local officials face a complex but crucial decision about the future of composting in Sonoma County, one that will have major implications for the life of the county landfill, the rate of emission of greenhouse gases and the size of people’s garbage bills.

That decision is whether to encourage the construction of a new, modern composting facility here, with costs of $50 million or more, or whether to continue hauling the material to existing facilities elsewhere indefinitely.

Environmental Center of Sonoma County

Tag: anaerobic digesters

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