Central San’s Nutrient Management Project 100078 is evaluating intensification technologies such as Membrane Aerated Biofilm Reactor (MABR) and Densified Activated Sludge (DAS) to reduce nutrient loads while minimizing new infrastructure footprint. The agency piloted MABR at small scale in 2024 and is planning a full‑scale MABR demonstration in 2026, while also preparing for a potential 2027 full‑scale DAS demonstration that would require splitting the treatment plant, installing hydrocyclones, advancing south selector improvements, and adding temporary pumping. These pilots are framed as key steps toward a best‑value nutrient upgrade solution and are partly connected to a recently awarded EPA grant to Bay Area Clean Water Agencies (BACWA) for MABR and DAS piloting, with Hazen and Sawyer providing wastewater process design leadership. Vendors of nutrient removal technologies, process equipment (e.g., hydrocyclones), controls, and related engineering services should view this as an early‑stage program where future large‑scale capital investments and procurements will be shaped by the pilot results and design metrics gathered in 2026–2027.

The project leverages an EPA grant to BACWA for piloting MABR and DAS; Central San’s poor settling c...