Current Status and Recent Advances in Recirculating Aquaculture Systems - PowerPoint PPT Presentation

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Current Status and Recent Advances in Recirculating Aquaculture Systems

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Illinois-Indiana Sea Grant College Program ... Yellow perch biology and RAS's. Economics. Sources of Information ... Southern Regional Aquaculture Center RAS's ... – PowerPoint PPT presentation

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Title: Current Status and Recent Advances in Recirculating Aquaculture Systems


1
Current Status and Recent Advances in
Recirculating Aquaculture Systems
  • LaDon Swann
  • Illinois-Indiana Sea Grant College Program
  • Purdue University and the University of Illinois
    Cooperative Extension Services

2
What Will be Discussed
  • Sources of information
  • Advantages and disadvantages
  • Components
  • Yellow perch biology and RASs
  • Economics

3
Sources of Information
  • Aquaculture Network Information Center (AquaNIC)
    http//aquanic.org
  • Southern Regional Aquaculture Center RASs
    publications numbers 451-456.
  • University demonstration projects

4
RAS Advantages
  • Reduced water requirements
  • Year round production
  • Ability to use existing buildings
  • High yields per gallon of water
  • Improved feed conversion
  • Reduced reproduction
  • More control

5
RAS Disadvantages
  • High initial investment
  • Complexity
  • Chronic sub-lethal effects of ammonia and carbon
    dioxide
  • Lack of successes for lenders
  • Inefficiencies in filtration

6
RAS Components
  • Site components
  • pump house
  • emergency generator
  • 3 phase electricity
  • bulk feed storage
  • oxygen supply
  • building
  • System components
  • biological filter
  • solids filter
  • tanks
  • aeration
  • buffering systems
  • heaters/chillers
  • lighting

7
Site Components
  • Building
  • Water
  • Electricity
  • 3 phase preferred
  • Other
  • bulk feed
  • oxygen tanks
  • emergency generator

8
Building
  • Pole barn
  • enclosed or semi-enclosed
  • access
  • foam insulation
  • moisture proof
  • floor drains

9
Electricity
  • 3 phase electricity
  • electricity is a major cost and 3 phase will
    reduce the expense
  • Emergency generator
  • in event of power outage there is a 30 minute
    window to restore power to system.

Natural gas generator
10
System Components
  • Primary
  • Solids filter
  • Biofilter
  • Tanks
  • Aeration
  • Secondary
  • Pumps
  • Heaters/chillers
  • Lighting
  • Disinfection

11
Solids Filtration
  • Sources
  • Fish wastes
  • Uneaten food
  • Types
  • Settable
  • Suspended
  • Fine and dissolved

Pressurized downflow sand filter
12
Solids Filtration
  • Settable solids (gravity removal)
  • Sediment trap
  • Settling tank
  • Inclined tubes
  • Hydrocyclone (swirl separator)

Gravity Sump
13
Solids Removal
  • Suspended Solids (non-gravity)
  • Screen filtration
  • Expandable granular media
  • Downflow (fine sand)
  • Upflow (course sand)

Suction
Screen
Screen filters
14
Solids Filtration
  • Fine and dissolved solids
  • Foam Fractionation
  • Principle
  • Particles attachto bubbles thatrise
    throughtube.

15
Biological Filtration
  • Sources
  • Fish metabolism
  • Function
  • Nitrification
  • Oxidizes ammonia and nitrite to nitrate

16
Types of Bio-filters
  • Submerged filters
  • Simple
  • Inefficient
  • Trickling filters
  • Simple
  • Aerates

Submerged filter
17
Types of Bio-Filters
  • Rotating biological contactor
  • External
  • Internal

Air channel
In-tank RBC airlift driven
RBC motor driven
18
Types of Bio-filters
  • Fluidized Beds
  • Very fine sand
  • Upflow filter
  • continuous backflush

Fluidized Bed(upflow)
19
Types of Bio-filters
  • Bead filters
  • Plastic beads
  • Solids and biofilter

20
Tanks
  • Criteria
  • non-toxic
  • durable
  • Materials
  • fiberglass
  • concrete
  • plastic
  • glass
  • others with liners

21
Pumps and Blowers
  • Types
  • impeller driven
  • blowers
  • Purpose
  • to move water through system
  • run some types of filters

Impeller driven pump
Low pressure blower
22
Aeration
  • Agitation
  • Agitators
  • aerates
  • degasses
  • Blowers
  • low pressure
  • powers airlifts
  • Ventura tubes

Bull agitator
23
Aeration
  • Oxygenation
  • Non-pressurized
  • Downflow bubble contactor (DBC)
  • Counter current diffusion column
  • U-tube diffusers

24
Aeration
  • Oxygenation
  • Pressurized
  • Pressurized spray tower
  • Pressurized packed column

Pressurized packed column
25
Bicarbonate Drip
  • Rational
  • CO2 removal (lt20 mg/L)
  • from respiration
  • Buffering
  • nitrification is an acidifying process
  • Purpose
  • Adds alkalinity to water

26
Other Components
  • Lighting
  • low light levels reduce stress to fish
  • Heaters/chillers
  • depending on species

Heater
Chillers
27
Production Rates
  • Variables
  • feed
  • aeration
  • harvest method
  • continual
  • batch
  • ¼ to 1 lb./gallon
  • Growth rates
  • 0.75 - 1.0 gram/day

28
Economics 101
  • Costs
  • 3 fingerlings per pound 0.90
  • 2 pounds of feed per pound 0.60
  • Operating costs 0.50 per pound
  • Sales
  • 2.25 per pound over long term (5 yrs)
  • Profit
  • 0.25 per pound

29
Conclusions
  • Building cost
  • 20 of initial investment
  • Production rates
  • (0.33 lbs/gallon)
  • Market price
  • 2.25 per pound
  • A typical system
  • Fiberglass tanks
  • Screen filter
  • Bead filter
  • Foam fractionation
  • Bicarbonate drip
  • Aeration using pure oxygen
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