Transcript PowerPoint Presentation on Victor Valley WRA Omnivore System

Victor Valley Water
Reclamation Authority
Biogas to Energy Project with
Omnivore™ Digester Demonstration
May 30th, 2013
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Agenda
1. Introducing Anaergia
and VVWRA Project
2. VVWRA Omnivore
Demonstration
3. VVWRA CHP Project
July 15
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Trusted for 20 years on 1,600 projects globally
Anaergia Offices
1,600 Installations 16 Offices 3 Manufacturing Plants
VVWRA Project Drivers
• Currently uses biogas in aeration blowers and flares
the balance
• Adding electrical load with new UV system
• Increasing electrical costs from Utility
• Sludge biogas production only sufficient for 800 to 900
kW but baseload demand exceeds 1.4 MW
• Issued RFP for biogas utilization and co-digestion to
increase biogas production to become energy
independent (and possibly net exporter of energy)
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VVWRA Omnivore Project
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VVWRA Omnivore Project
Omnivore Demonstration
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Summary: A research project to demonstrate the ability for
wastewater treatment plants to be utilized as power generating
facilities while disposing of high strength organic waste.
•
Partnership: Partially funded by the California Energy Commission’s
Public Interest Energy Research (PIER) Program.
•
Goals: The demonstration will be studied for the Energy
Commission, and technology transfer
•
Progress: Construction will begin in June, and trials are expected to
begin this September.
Omnivore Principles
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Decouple HRT from SRT removing from digester more water
than solids
Increase SRT 2 to 3 times for improved VSR >60% on combined
sewage sludge  Capacity Increase of 2 to 3 X.
Extend SRT with recuperative thickening
As digester solids content increases, we improve mixing to
handle higher viscosity sludge
A well operated digester with long SRT and high bacterial
biomass inventory achieves similar VSR compared to complex
and energy intensive thermal hydrolysis or other WAS pretreatment methods
Omnivore Implementation
Recuperative Thickening
• Feed 4 to 5% TS sludge as conventional, no changes in TWAS, PS
digester feed
•
Conventional digesters operate at 2 to 2.5%TS after VS destruction
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Omnivore operates in 6 to 8% range without changing digester
feed
Hydraulic Mixing System
• Viscosity increase from 0.4 to 5 Pa.s for sludge 2.5 to 5%TS
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Floating cover replacement with double membrane gas holder for
improved gas utilization flexibility
Service Box
• Allows mixer inpection, maintenance or removal with digester in
July 15
service
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Anaergia Sludge Thickener
Heart of Omnivore™
concept is Anaergia’s
recuperative
thickening system
Hydraulic Mixers
Mixer retrievable through service box
without having to shut down digester.
Able to mix higher viscosity due to
increased solids.
Mixer Hydraulic Power Units
External Drive for up to 5 mixers
Service Box
Mixer access without
shutting down
digester
Double Membrane Cover
Allows 4 hours biogas
storage to regulate
flow to CHP
Service Boxes and
Hydraulic Mixing
Systems designed to
this type of cover
July 15
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VVWRA Combine Heat &
Power Project
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VVWRA CHP Project
Combined Heat and Power Plant
•
Summary: Anaergia will provide 1,600 kW of generation capability
for use at the Treatment Plant (2 – 800 kW IC engines). The project
will utilize all biogas produced on site including the increased flows
from the Omnivore project.
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Partnership: The Project is partially funded by the Self Generation
Incentive Program (SGIP), and will be operated by VVWRA.
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Progress: In design and permitting stage. Construction is set to
begin late summer, and startup is expected in late winter.
VVWRA CHP Project Details
Major Equipment
(2) 2G-Cenergy 800kW Engines
PillAerator Blower
VVWRA CHP Project Details
VVWRA – Net Benefit and Future Possibilities
Regulatory Drivers
• SB1122 – project is expandable to generate excess energy which
could be exported under SB1122 which requires utilities to procure
energy from these types of sources
• AB341 – Omnivore demonstration is the first step in creating
capacity at a municipal wastewater treatment plant to accept
external waste. As California begins to force organics diversion,
VVWRA will be in a good position to accept external organic waste
to assist member cities in meeting diversion goals.
• AB323 – pending legislation by CalRecycle that will ban commercial
organics from the landfill; will require this type of infrastructure to
handle this portion of the municipal solid waste stream
Cost Savings
• Estimated to save VVWRA over $9 million over 20 year PPA.
Summary
• VVWRA, the California Energy Commission, and
Anaergia will demonstrate, study, and share the
impacts of an Omnivore retrofit at VVWRA.
• Biogas produced at VVWRA’s Wastewater Treatment
Facility will be utilized to produce up to 1,600 kW of
electricity to be used at the Plant.
• The Omnivore and CHP projects will help VVWRA
demonstrate the ability for wastewater treatment
plants to be utilized as power generating facilities
while disposing of high strength organic waste.
July 15
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Questions and Contact Information
Thank you!
David Schneider
Director of Business Development
P: (760) 436-8870 x 130
E: [email protected]
Juan Josse
Chief Engineer
P: (760) 436-8870 x 120
E: [email protected]
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