On site oxygen production for Aquaculture

Oxygenation of rearing tanks is a key element in guaranteeing optimum oxygen concentration in the water for the well-being of the animals, and thus maximizing production on your site by saving feed costs and maximizing farms productivity.

With competitive price and timely delivery, Benyuan sincerely hope to be your supplier and partner.

Therefore, oxygen is a gas widely used on fish & shrimp farms. Traditionally, liquid or gaseous oxygen is supplied to these sites by trucks. However, recent years have shown the fragility of supply chains and have seen the cost of oxygen and its transport soar, generating significant production overruns and the risk of supply disruptions.

To address these issues, Novair provides on-site oxygen production solutions adapted to the specific needs of aquaculture. It offers you the opportunity to become your own supplier of high-quality oxygen, to gain full autonomy and improve your technical and economic performance.

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Novair on-site oxygen production for your pure oxygen demand

When sizing the right system for you, we consider all relevant parameters that will affect the demand for dissolved oxygen in your ponds, raceways or tanks, including:

• Species of fish or shrimp raised
• Total water volume
• Water temperature
• Water salinity
• Required injection pressure
• Efficiency of your oxygen dissolution equipment
• Oxygen purity

NOVAIR on-site oxygen solutions for aquaculture :

NOVAIR provides aquaculture farms with on-site oxygen production systems that are designed to ensure an easy, reliable, and cost-effective supply of the pure oxygen required. With Novair&#;s oxygen solutions farms can safely operate at optimum and well-controlled dissolved oxygen (D.O.) concentrations. This is key to achieving the best Feed Conversion Ratios (FCR), also at increased stocking densities. It also prevents fish-stress, thereby improving fish health, survival, and growth rates.

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Benefits of working with Novair on-site oxygen production solutions

• Complete plug and play solutions available
• Control dissolved oxygen concentrations to optimum levels, also at increased stocking densities
• Prevent fish stress, improve fish health, growth and survival rates
• Ensure optimum Feed Conversion Ratios (FCR)
• Produce larger quantities of fish while improving meat quality
• No bubble disease risk, associated with nitrogen oversaturation
• Provide the oxygen quality required for feed gas of ozone generators, producing ozone for water disinfection
• Use of surplus renewable energy provided by your solar, wind and/or hydroelectric power plants

 

Novair oxygen solutions are used in culture of Trout, Atlantic Salmon, Tilapia, Shrimp, Golden Seabream, Seabass, Adour Salmon, American Catfish, Pike Perch and many other species.

Our solutions are used by a large community of customers such as renowned salmon farmers in Canada and Chile, State research stations focusing on improving practices of national aquaculture industry, Private research centers for mariculture, Public fish hatcheries, Private fish farming companies, Aquaponics farms and more.

Amongst our references

Northern Harvest Smolt Hatchery in Stephenville, Canada is equipped with NOVAIR oxygen generating systems.

For more than 6 years, the NOVAIR state-of-the-art technology has assured the efficient production of oxygen on-site, thus reducing the hatchery&#;s environmental impact and fostering a healthier ecosystem for its salmon.

NOVAIR oxygen generators ensure a consistent and reliable oxygen supply, Northern Harvest has witnessed improved fish health and accelerated growth rates, contributing to its mission of sustainable seafood production.

Contact us to discuss your requirements of Oxygen Generator For Aquaculture. Our experienced sales team can help you identify the options that best suit your needs.

 

 

17. Oxygenation

Costs and Benefits of Using Pure Oxygen

Oxygenation adds cost to recirculation production, but the benefit is that system production can be increased 50% or more. The advantage here, of course, is that capital investment in the production system is used more productively. The only way to determine if oxygenation is cost effective is to do a cost/benefit analysis. The question is whether the cost of installation and running of an oxygenation system is offset by the extra fish that can be grown during the service life of the entire system. In other words, the cost per pound of fish of oxygenation is compared to the reduced cost per pound of system depreciation. In one analysis on a moderately large system, oxygenation added about 5% to the cost per pound and was determined to be justified.

Photo Tennessee Valley Authority

Photo Courtesy of Aquatic Ecosystems, Inc.

Sources of Pure Oxygen

There are two sources of pure oxygen for recirculation aquaculture. One is liquid oxygen that can be purchased from industrial sources and the other is oxygen generated from the air using an oxygen generator. Liquid oxygen requires a special tank and evaporators to vaporize the gas. Oxygen generation requires a machine to separate O2 from the air. Both sources have to be distributed to the tanks in special plumbing installed by people certified to work with liquid oxygen distribution because of the fire hazard of leaks. Liquid oxygen has to be purchased, of course, but has the advantage of needing no electricity for use. A regulator meters it as it evaporates generating its own pressure. The oxygen generator requires a relatively large amount of power and is susceptible to power outages. Again, the more cost effective source must be determined in each case, depending on local costs of liquid oxygen and power and the frequency of power outages.

Use of Pure Oxygen

Regardless of its source, pure oxygen is expensive and must be used more efficiently than aeration. The aquaculturist must strive to have 100% of the oxygen transferred to the water. It is not acceptable to simply bubble liquid oxygen into the tank allowing much of it to escape directly to the atmosphere. There are five basic approaches to maximizing transfer of pure oxygen to water.

U-tubes

U-tubes use hydrostatic pressure from a column of water to force oxygen into solution. The column is typically 30 to 150 feet (10 - 50 m). The easiest way to produce this deep water is to use well drilling machinery to produce a hole in the earth and insert two pipes, one inside the other. The outer one is closed at the bottom, but the inner one is not. Water flows down the inner tube and up the outer one. So, the tube is not a "U" in the conventional sense, but functions like one.

Oxygen bubbles are injected as the water enters the downward flowing pipe. As they are carried deep they dissolve at a total pressure of several atmospheres (one additional atmosphere (760 mmHg) for each 30 ft (10m) of hydrostatic pressure. This hydrostatic pressure plus the fact that the gas pressure of oxygen in the bubbles is not shared by any other gases (so it is not "partial" but the combined total of the hydrostatic and atmospheric pressures) results in super saturation of oxygen as it returns to the surface. While supersaturation is possible whenever pure oxygen is used, it always occurs with the U-tube. Fish can tolerate oxygen supersaturation of up to about 150%, but beyond that is too risky, so oxygenated water may need to be diluted before it reaches a fish's gill. A related and much more dangerous condition is nitrogen supersaturation. Nitrogen supersaturation of over 125% results in gas bubble disease that quickly kills fish, so care must be taken to never let bubbles of air enter a U-tube. While a U-tube can result in concentrations of oxygen up to 40 mg/L it is not particularly efficient at transfer, with only about 50%. Off gas recycling as the water returns to the surface can increase this substantially.

Packed Columns and Spray Boxes

These generate a large surface area for diffusion within a pure oxygen atmosphere. A packed column is essentially a small version of a trickle filter. Media is packed into a column to break the water up into a large surface area as it trickles down over it. Oxygen flows upward through the tube to generate a countercurrent transfer. If the column is open at the top, care must be taken to ensure that oxygen is not being lost to the atmosphere. An alternative is to seal the top and recycle the off gas. Of course, the media is soon colonized by bacteria. This is good, up to a point, because it adds nitrification capacity, but it can be a problem if the column clogs. A spray box achieves a large surface area for diffusion by spraying water into an enclosed container of pure oxygen. This may be as simple as a floating paddle aerator in the fish tank sitting under an inverted clear plastic box connected to the oxygen supply.

Low Head Oxygenator

Low Head Oxygenators

This device consists of a sealed box subdivided into multiple compartments. Water enters at the top, falls through the compartments, and exits at the bottom. Pure oxygen flows into one side and then from one compartment to another through small holes. As the water spills down through the oxygen, diffusion occurs. The benefit of this system is that the atmosphere in each successive compartment contains less oxygen and more off gases, so by the time the gas mixture exits the last compartment, little oxygen is wasted.

Use of Pure Oxygen Continued in the Next Chapter...

Assignment 17

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