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Sunnyvale smart station diverts about half of inbound material and sends food scraps to wastewater plants for energy
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Summary
At a City of Sunnyvale webinar, Smart Station director Jeff Dobbert said the facility currently diverts roughly 50% of incoming material and processes food scraps into a mash that is sent to regional wastewater treatment plants for anaerobic digestion and energy recovery; staff outlined services, safety priorities and a planned retrofit to boost diversion.
Jeff Dobbert, director of operations for the Smart Station, said at a City of Sunnyvale sustainability webinar that the facility reclaims roughly half of the material it receives and converts food scraps into a pumpable "mash" that wastewater plants anaerobically digest to generate energy.
"We're currently diverting 50% of all the material that comes to the facility as a whole," Dobbert said, describing how the station separates garbage, recyclables and organics on split processing lines and manual sort belts. He said food scraps are augered and agitated into a mash and loaded into tanker trucks for delivery to permitted plants including East Bay MUD and Silicon Valley Clean Water for energy production.
The Smart Station accepts a range of residential and self-hauled materials, including split-cart curbside recyclables (fiber and containers), yard trimmings, construction and demolition material, and items dropped off at the facility’s CRV buyback and hazardous-waste collection points. Dobbert said the facility processes more than 140,000 tons of municipal solid waste per year and is permitted for up to 1,500 tons per day.
Dobbert and city staff emphasized worker safety as the top operational priority given heavy machinery, cut hazards and occasional fires. "That's our number one concern," Dobbert said, listing PPE, regular inspections and pre- and post-trip vehicle checks as part of safety protocols.
On organics, Dobbert said the station’s food-scrap processing yields an approximately 80% diversion rate for that stream when processed into mash and sent to digesters, compared with historical disposal in landfill before the program began in 2017. He noted that not all food in the municipal garbage can currently be recovered for digestion: material placed in regular garbage faces barriers to processing and is typically routed to composting rather than to wastewater digestion unless collected as a clean organics stream.
Dobbert said exact year-by-year breakdowns of what fraction of every commodity ends up in landfill would be provided later and that the city has a study with more precise figures. He also described how glass, PET and HDPE are manually or mechanically separated and baled for remanufacturing.
The presentation closed with reminders about resident services — free compost and mulch, document-shredding events, CRV buyback — and invitations to sign up for facility tours via the city website. Moderators said the webinar recording and resources would be emailed to attendees.
The session did not include formal votes or policy decisions; instead, staff described operations, services and the practical limits of current processing capacity.
