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SFPUC staff favors thermal‑hydrolysis for Southeast biosolids project after alternatives review
Summary
After reviewing four state‑of‑the‑art options, staff recommended moving forward with a thermal hydrolysis pretreatment (THP/CAMBI) for the Southeast Plant biosolids replacement project, citing lower operating costs, reduced digester volume and higher energy reuse potential; the Alternatives Analysis Report will continue and environmental review will follow.
The San Francisco Public Utilities Commission heard an informational update on the Southeast Plant Biosolids Replacement Facility and the alternatives analysis that will shape the project’s technology selection.
Emilio Cruz, assistant general manager for infrastructure, walked the commission through the project objectives — meet regulatory requirements, convert biosolids from Class B to Class A, achieve 100% beneficial reuse, reuse biogas, minimize neighborhood impacts, and support community benefits during construction. Staff reviewed a long list of technologies and narrowed options to four state‑of‑the‑art alternatives: (1) mesophilic anaerobic digestion with mechanical drying, (2) mesophilic digestion plus…
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