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PUC pushes thermal hydrolysis pretreatment for Southeast digester rebuild after European site visits
Summary
After a five-day international site visit, SFPUC staff and Supervisor Cohen recommended including a thermal hydrolysis pretreatment (THP/CAMBI) in the Southeast Treatment Plant digester rebuild, citing odor containment, reduced digester volume, and Class A biosolids production; the Commission heard questions about food waste logistics, costs, and next steps for CER and detailed design.
Supervisor Cohen and SFPUC staff presented the findings of a multi-site international visit and recommended moving forward with the thermal hydrolysis process (THP) as a core pretreatment for the Southeast Treatment Plant digester rebuild. Cohen said the trip gave him confidence that the technology can reduce odors and produce a Class A biosolids product, and offered to sponsor and advocate for the project.
Why it matters: The digester rebuild is a major component of the Sewer System Improvement Program (SSIP). Staff told commissioners that THP can reduce solids volumes and the number/size of digesters required, contain odors within the plant, and produce a marketable Class A product. Staff presented site visits to plants in Dublin (Ringsend), Crowley, Oxford, the CAMBI…
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