Fairfield Suisun Sewer District Special District established in - - PDF document

1

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

2

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 MAINS SERVICE AREA POPULATION

3

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

4

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

5

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

‐1000 ‐500 500 1000 1500 2000 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 Power Production (kW) Time

September 4, 2015 (12:00AM ‐ 11:59PM) Electricity Profile

PG&E kW Cogen kW Solar kW Wind kW Total Plant Power

6

Annual Power Use

PG&E Import 45% Solar (On‐Site) 16% Solar (Export) 5% Cogen Production 33% 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

7

Thank you!

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