principal of oxygenations
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aquacultureTRANSCRIPT
OXYGENATION IN AQUACULTURE
DEPARTMENT OF AQUACULTUREFACULTY OF FISHERIES AND MARINE SCIENCE
BOGOR AGRICULTURAL UNIVERSITY2014
OXYGENATION
The availability of dissolved oxygen (DO) is usually the first factor that limits increased carrying capacity and production in intensive
When DO concentrations are low, fish, shrimp, and other aquatic life suffer stress that can result in their slowed growth, susceptibility to disease, or even death.
OXYGENATIONPurified O2 gas is contacted with water; Dissolved O2 super-saturation produced Some N2 gas is stripped.
OXYGENATION Enriched O2 increases DO solubility nearly5-fold compared to air.
48.1 mg/L vs. 10.1 mg/L (@ 15ºC)
Increasing pressure from 1 to 2 atm doublesthe DO solubility.
97 mg/L vs 48 mg/L (@ 15ºC)
OXYGENATION The dissolved oxygen requirements of aquatic
organisms depends on numerous factors: stocking density, feed rates, stress levels, water
temperature, Salinity, species, etc. For cold water species, oxygen requirements for the
fish range from 0.3 to 0.5 kg O2 per kg of feed. At higher temperatures (oxygen requirements of the
biofilter and other bacteria), this could be as high as 1 kg O2 per kg feed.
OXYGENATION
Intensification with oxygenation & aeration is limited!Every 10 mg/L DO consumed adds:
1.0-1.4 mg/L TAN 13-14 mg/L CO2 10-20 mg/L TSS
OXYGENATION
OXYGENATION
OXYGENATION two most widely practiced emergency
techniques for dealing with low D.O. :water exchangesupplemental paddlewheel aeration.
Both are somewhat effective in reducing the impact of low D.O., but have limitations.
OXYGENATION
So, Oxygen Injection as a practical option in an overallstrategy for D.O. management.
In these applications, the technology can help manage the demand for oxygen, particularly in the latter stages of growout, when sludge generates a large demand.
OXYGENATION
OXYGENATIONThe main components of oxygen injection systems: oxygen source (tanks or oxygen generator) a hose or other tubing to transfer the oxygen a diffusion device
OXYGENATION
Oxygenation technology depends on several factors specific to the equipment, including:oxygen absorption efficiency (mass of oxygen absorbed per mass of
oxygen applied), oxygen transfer efficiency (mass of oxygen transferred per power
required), ability to strip nitrogen and other gases, ease of control, effectiveness when scaled-up, ability to treat flows containing suspended solids without plugging,
Aplication in fish transportation system
Reference
Mathur A. 2005. Oxygen injection system provide emergency aeration, DO Management. Paradise Shrimp Farm, USA,South Carolina : Edisto.
Boyd Claude E. 2001. Water Quality Standards: Dissolved Oxygen. Department of Fisheries and Allied Aquacultures International Center for Aquaculture and Aquatic Environments Auburn University Auburn, AL 36849 USA
Vinci BJ. 2000. Oxygenation and carbon dioxide control in water reuse systems. Aquacultural Engineering, 22 (2000) 87–108.
Thank you
Oxygen Source – PSA/VSA Enriched O2 can be produced on site using pressure swing
adsorption (PSA) equipment: 85 to 95% purity requires PSA unit and air dryer, compressor to produce 90 to 150 psi, stand-by electrical generator. costs about 1.1 kWh of electricity per kg O2
produced.
Oxygen Source - LOX Enriched O2 can be purchased as a bulk liquid:
98 to 99% purity Capital investment and risk are lower than PSA, Annual liquid O2 cost can be 3-times > PSA O2 Location
specific Transportation costs are a MAJOR component of the
total LOX cost