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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

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Questions?

PR Aqua Nanaimo, BCGenny West

genny@praqua.com