Sonoma County weighs how to bring back composting


Black soldier flies eat decomposing food scraps, turning it into natural fertilizer. Anaerobic digestion converts yard debris into organic compost in an oxygen-starved environment while making natural gas out of the methane produced. Compost facilities incorporate worm farms to break down food and yard waste into high-quality compost for backyard gardeners and large-scale farmers.

Sonoma County waste officials are considering such technologies as part of a plan to bring locally produced compost back to the county, roughly a year after a high-profile Clean Water Act lawsuit forced the shutdown of Sonoma Compost Co., a private operation at the Central Landfill west of Cotati that since 1993 served as the largest local producer of compost.

Between now and Nov. 14, the Sonoma County Waste Management Agency is seeking input and assessing interest from businesses with experience in composting, as well as entrepreneurs who may be interested in launching new local composting operations. Requests for specific proposals are expected to open early next year.

Hauling the 88,000 tons of yard waste and food scraps produced in the county to four outside sites in Novato, Ukiah, Napa and Vacaville costs ratepayers $4.5 million per year, according to waste agency officials, up from $2.5 million when it was handled locally. Garbage bill rates have ticked up slightly, compost has become more expensive and transporting organic material to neighboring sites ratchets up emissions of greenhouse gases associated with producing compost, county waste officials said.

Supervisors expressed support this week for the idea of multiple sites run by the private sector, a reversal from previous plans to have the waste management agency operate a central site. Private composting business could halt the practice of trucking away compostable materials, reduce waste management agency costs and eliminate future risks of legal action.

Read more at: Sonoma County weighs how to bring back composting | The Press Democrat