1 partial reuse idaho march 2010 presented by: genny west lsrcp production meeting 2010 boise, idaho...
TRANSCRIPT
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PARTIAL REUSE IDAHO
March 2010Presented by: Genny West
LSRCP Production Meeting 2010Boise, Idaho
Advancing Sustainable Aquaculture
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About PR Aqua
25 Years of Aquaculture Service Started in fiberglass Total hatchery supply Engineering Services for hatchery design Moved into recirc and reuse design of
hatcheries Most of the work with State government
hatcheries Help deal with drought and disease and overall
water conservation and meeting regulations
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Starting Point Circular Tanks
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Traditional Flow-Through
Difficult to flush solids
Not easy to clean
Plug flow – not great mixing of oxygen
Low densities due to crowding at one
Enormous water consumption
If not gravity flow, large pumping costs
Courtesy of Freshwater Fisheries Duncan
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Circular Tank Discussion
Excellent mixing of new oxygenated water
Even temperature distribution
Optimum rotational velocity
Self-cleaning feed and feces
Maximum volume utilization
Morts and solids get directed to center of tank
Courtesy of State of Wyoming
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Tank Systems
Full Tank System with Swirl Separator Cornell Style Dual Drain
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Swimming Patterns
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Fish CrowdingExample
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Seining in 36’ dia.x10’ Tank
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Moving FishThe Fish Pump
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Recirculation vs ReuseRecirculation
Between 95 to 99.9% of flowReduced cost of heatingMin. Required Processes:
Solids Filtration Biofiltration CO2 Removal Oxygenation
ReuseBetween 50 to 85% of
flowGreater cost of heatingMin. Required
Processes:• Partial Solids
Removal• CO2 Removal• Oxygenation
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Simplest Reuse
Treatment of Gases Removal of CO2
Addition of Oxygen Can achieve 50-85%
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Tank Side ReuseExample
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Gas BalancingDetailed
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Low Head Oxygenator (LHO)
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CALIFORNIA
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Raceway Oxygenation
State of California – Fish production mandates No new water Old raceway systems – no $$ to upgrade to tanks Installing LHO’s to benefit WQ Achieve higher densities thereby increasing
production #’s Oxygen supply via Oxygen Generators Anticipate a 50% increase in production just with
the addition of oxygen
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Oxygen Supply Generation or Lox
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Oxygen Supply Pros and Cons
Bulk Oxygen High pressure 99.9% pure - no nitrogen Always available No mechanical failures More expensive especially
for remote sites
Generated OxygenNot recommended for
high pressure oxygenation
Only 92% pureEnergy dependentCan break down so
emergency back up reqd.Less expensive
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WYOMING
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Wyoming Fish and GameSerial Reuse
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Influent Treatment – Vacuum Degassing and LHO’s
Wyoming Fish and GameSerial Reuse cont’d
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Reuse SystemEffluent Treatment
Wetland
Drum Filters
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WASHINGTONThe Cadillac of PRAS
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Recently WA State went through the tank vs raceway discussion Have completed a pilot done in conjunction with Chelan PUD –
juvenile Chinook/Steelhead Partial Reuse system set up right next to a raceway system Evaluated performance, health & welfare Survival rates on returns
State of WashingtonPRAS with Circulars vs
Traditional FT Raceways
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The ProcessExtensive Reuse
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State of WashingtonEastbank Hatchery
Reuse
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State of WashingtonEastbank Reuse cont’d
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75% water savings Comparable growth with raceway fish Higher densities and more production with
75% less water 18% better survival in PRAS Significant decrease in precocious males Year two trials – doubling densities
State of WashingtonEastbank Hatchery Results
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Target Marine – The Transition – Reuse to Recirc
Transitioned from:
Flow through – Partial Reuse - Recirc
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UTAH
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State of UtahRecirculation System
Typical Recirculation System
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State of UtahRecirculation System
cont’d
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ALASKA
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William J. Hernandez Sport Fish Hatchery
Bio-plan: 18 different production groups
Resulted in: 41 tank groupings Modules: 15 individual full recirc
systems6 tank sizes4 process designs
Arctic Char Arctic Grayling Lake Trout King Salmon Silver Salmon Rainbow Trout
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WJHSFH Multiple Reuse Strategies
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Overall Benefits of Reusing Water in Fish Hatcheries
Water conservation Effluent reduction-for EPA regs. More solids concentration More controlled environment Fish production increase potential Fish health improvements Better utilization of water resources –
higher densities More fish / less water in / less water out
