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HomeMy WebLinkAboutItem No. 11 PPP 09-07-2022 Operations Committee - Supercritical Water8/31/2022 1 Supercritical Water Oxidation Solids Treatment Presented by: Robert Thompson Assistant General Manager Operations Committee September 7, 2022 2 • Positive Test Results • Staff Seeking Regional Partners • Federal Funding Update • Cost/Schedule Update Follow Up Information 1 2 8/31/2022 2 3 Location Administration Building Plant No. 1 Entrance Project Location 4 Fate of Chemicals in Solids N Forms•Organic•Urea, ammonium•Heterocycles SCWO Process P Forms•Organic•Phosphate Vent gasN species are mostly transformed to N2 gas Solid minerals Phosphate precipitates Ca3(PO4)2MgNH4PO4·6H2O Gas composition<3 ppmv NH3<5 ppmv NOx<3 ppmv SOxNo odor S Forms•HS-, COS, organic•Mercaptans Sulfates, Hydrates CaSO4 Emerging Contaminants•Pharmaceuticals•PFAS, 1,4-D Mineralized to CO2Fluoride dissolved, CaF2 Metals -Dissolved -Precipitates©2021 374Water Inc 3 4 8/31/2022 3 5 Tests of OC San Sludge • Southern California Air Quality Management District asked for air emissions data as part of the permitting process. • OC San Biosolids sent to the existing one-ton-per- day unit. • Test results are promising. 6 • The Board directed staff to seek out local research partners to share in the risks, costs, and potential rewards. • Staff are having positive discussions with other agencies. • Federal Funding Opportunities look promising for $3M to $3.4M. Staff Are Seeking Partners 5 6 8/31/2022 4 7 Project Item Current Projected 374Water Contract (Equipment and Operation) $5,139,000 $5,139,000 Public Works Site Prep and Utilities $370,000 $1,855,000 OC San Costs (Staff, Permitting, Etc.) $254,000 $439,000 Contingencies $1,127,000 $1,167,000 Total Project Cost $6,890,000 $8,600,000 Project Budget Staff will bring a budget increase request, if necessary, with the award of the Public Works Site Prep and Utilities Contract. Sufficient funding exists in the Research Program at the current estimate. 8 Project Schedule Milestone Date Site Prep Project Advertised September 2022 Fabricate Nix 6 and Solids Feed October 2022 Site and Utility Construction March 2023 Install and Commission Unit August 2023 374Water Startup and Operation December 2023 OC San Own and Operate March 2024 7 8