fssd’s ongoing path towards energy neutrality · power production (kw) time september 4, 2015...
TRANSCRIPT
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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
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Key District Stats
EMPLOYEES TREATMENT PLANT SITE (350 ACRE BUFFER)
OFF-SITE WASTEWATER PUMP STATIONS
STORMWATER PUMP STATIONS (O&M)
Key District Stats (continued)
DRY WEATHER TREATMENT CAPACITY
WET WEATHER TREATMENT CAPACITY
LENGTH OF DISTRICT-OWNED GRAVITY SEWERS
AND FORCE MAINSSERVICE AREA POPULATION
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Renewable Energy Portfolio
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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
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Cogeneration
• 2 functional cogenengines
• 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
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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
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Power Production (kW
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Time
September 4, 2015 (12:00AM ‐ 11:59PM) Electricity Profile
PG&E kW Cogen kW Solar kW Wind kW Total Plant Power
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Annual Power Use
PG&E Import45%
Solar (On‐Site)16%
Solar (Export)5%
Cogen Production33%
Wind Turbine Production
1%
FSSD POWER SOURCES
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
FSSD Biosolids
Lystek Process
Agricultural Fertilizer
(LysteGro)
Sold by Lystek as Fertilizer
Digester Supplement
(LysteMize)
Re‐Fed to FSSD Digester for Increased Gas Production
Additional Energy
Imported Biosolids
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Thank you!
Jordan DamerelEnvironmental Engineer
(707) 428‐[email protected]
Ben CarverO&M Tech 5
(707) 428‐[email protected]