Gas Control & Carbon Dioxide Balancing
Did you know that for every pound of oxygen consumed by fish, they exhale 1.38 pounds of carbon dioxide? Maintaining proper gas balance is critical to the health of your fish.
Pentair Aquatic Eco-Systems has scientific and engineering experts to help solve your gas-balancing challenges.
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How Our Products Can Help
Carbon dioxide causes problems in recirculating aquaculture systems without aeration or degassing. Carbon dioxide must be removed, or it can build up to levels that are dangerous to the fish and to humans if the fish are raised in a closed building.
Gases in water naturally reach their equilibrium when the water is exposed to air, but Pentair Aquatic Eco-Systems has solutions to help this process when gas balancing that occurs naturally is not producing optimal levels.
For indoor operations, air ventilators are sometimes used, but they can also remove a lot of heat along with the carbon dioxide. We suggest that carbon dioxide be stripped with a degassing column that is ventilated to the outdoors. Outdoor air can be drawn directly into the bottom of the degassing tower, forced up through the water and then directed back outdoors. In cold weather, there will be a significant cooling effect on the water because it is being degassed through cold, dry air. A simple air-to-air heat exchanger can help.
How to Balance O2, N2, CO2
The objective of gas balancing is to have the concentrations of all dissolved gases approach a state of equilibrium with the gases in the atmosphere. Most important to raising healthy fish are the levels of oxygen (O2), nitrogen (N2) and carbon dioxide (CO2). The balancing process naturally occurs whenever water comes into contact with atmospheric gases but may be achieved more quickly and efficiently with gas-transfer equipment. A common function of most gas-transfer equipment is to break a flow of water into droplets or thin films. This greatly increases the exposed surface area of water and accelerates the transfer of gas molecules into and out of the water. Alternately, small bubbles are passed through the water to introduce gas into the water.
How to Remove Excess Carbon Dioxide
Too much carbon dioxide (CO2) in your culture water interferes with the fish’s ability to take up oxygen, even if oxygen levels in your system are adequate. It will also cause the water to become acidic, especially if alkalinity is limited. Therefore, removal of excess CO2 is absolutely critical, especially in recirculating aquaculture systems.
HE Group Gas Control Tower
The GCT™ Gas Control Tower from our GE Group Division offers these advantages:
- Designed to maintain the highest level of water quality with the lowest operating and maintenance costs
- Customized configurations with optional components available to meet site specific requirements
- Easy access for cleaning and maintenance
- Designed for containerized shipping anywhere
Pentair Aquatic Eco-Systems experts can help you to find a solution by sharing our knowledge of gas balancing: