Fairfield Suisun Sewer District Special District established in - PDF document

FSSD’s Ongoing Path Towards Energy Neutrality Fairfield ‐ Suisun Sewer District BAYWORK North Bay II Workshop on Wheels October 14, 2015 Ben Carver & Jordan Damerel Fairfield ‐ Suisun Sewer District • Special District established in 1951 • The District provides: – Wastewater conveyance and treatment – Stormwater drainage maintenance services 1

Key District Stats EMPLOYEES TREATMENT PLANT SITE (350 ACRE BUFFER) OFF-SITE WASTEWATER STORMWATER PUMP PUMP STATIONS STATIONS (O&M) Key District Stats (continued) DRY WEATHER TREATMENT WET WEATHER TREATMENT CAPACITY CAPACITY LENGTH OF DISTRICT- OWNED GRAVITY SEWERS SERVICE AREA AND FORCE MAINS POPULATION 2

Renewable Energy Portfolio N Anaerobic Digesters • 2 anaerobic digesters (1 currently in use) • 2015 stats: • 69,000 gpd sludge feed • 62% volatile solids reduction • 214,000 scf/d gas production 3

Cogeneration • 2 functional cogen engines • 900 kW • 500 kW • Blends digester gas with natural gas to steady engine operation • 2015 average = 14,000 kWh/d • Approx. 33% of District’s electricity use over the last year Wind Turbines • 4 wind turbines, 50 kW capacity each • 2015 average: 515 kWh/d total • Approx. 1% of District’s electricity use over the last year 4

Solar Panels • 1 MW capacity solar array • Single-axis tracking • 2015 average: 7,100 kWh/d • Approx. 21% of District’s electricity use over the last year (a portion of which was exported to PG&E) A Typical Day of Energy Use September 4, 2015 (12:00AM ‐ 11:59PM) Electricity Profile 2000 PG&E kW Cogen kW Solar kW Wind kW Total Plant Power 1500 1000 Power Production (kW) 500 0 0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00 13:00 14:00 15:00 16:00 17:00 18:00 19:00 20:00 21:00 22:00 23:00 0:00 ‐ 500 ‐ 1000 Time 5

Annual Power Use FSSD POWER SOURCES Wind Turbine Production 1% PG&E Import Cogen Production 45% 33% Solar (Export) 5% Solar (On ‐ Site) 16% Partnership with Lystek • Lystek International • Will process up to 150,000 wet tons (18%±) biosolids into Class A liquid fertilizer product at the District’s treatment plant • Goal is to import up to ~135,000 wet tons of biosolids from other agencies • Proprietary process uses heat, alkali, and high shear mixing to lyse biological material Agricultural FSSD Biosolids Sold by Lystek as Fertilizer Fertilizer (LysteGro) Lystek Process Re ‐ Fed to FSSD Digester Imported Digester for Additional Supplement Biosolids Increased Gas Energy (LysteMize) Production 6

Thank you! Jordan Damerel Environmental Engineer (707) 428 ‐ 9155 jdamerel@fssd.com Ben Carver O&M Tech 5 (707) 428 ‐ 9139 bcarver@fssd.com 7