Aeration and oxygen supply in aquaculture

According to the Food and Agriculture Organization (FAO), aquaculture means the breeding of aquatic organisms, including fish, fungi, crabs and aquatic plants, snails, algae and other organisms which includes the breeding of fish from fresh and salty waters under controlled conditions. This method is performed both in marine environments and in underground habitats. Fish farming is the commercial breeding of fish in tanks, fish ponds or ocean ponds.

Oxygen is soluble in water for the respiration and life of aquatic plants and animals, which enters the water through inactive release from the atmosphere or through the photosynthesis of phytoplankton and other aquatic plants and is expressed in milligrams per liter.

The amount of dissolved oxygen in water depends on three important factors: water temperature, altitude and salinity Therefore, a small amount of oxygen can be dissolved in water, which is affected by atmospheric pressure.The maximum dissolution capacity of oxygen is 100% saturated with oxygen in water, and the excess is released from the water and into the air.

The amount of oxygen consumed by fish depends on their age, species, size, activity, and their respiration status. It is generally estimated that the consumption of fish for freshwater species at 17-120 ° C at rest is about 210-65 mg / l and during the incubation period and the early growth stages of juvenile fish the oxygen range is between 7 and 10 mg per liter.For other growth stages in fish farming, water-soluble oxygen in the range of 8-12 mg / l is suitable. According to research by colleagues in 1976, if the concentration of dissolved oxygen reaches less than 25% saturation, fish growth will decrease and too much concentration will not be beneficial for aquatic animals and may even cause gas bubble disease. Optimal water-soluble oxygen in farming water has a saturation of near 130 percent. The amount of optimal and tolerable water-soluble oxygen is different in growing stages of the fish.It is important to know that fish’s oxygen consumption increases significantly during and after being fed. During this time, oxygen consumption increases significantly.

 

Advantages of using pure Oxygen in Aquaculture

Following benefits result from increasing the amount of dissolved oxygen in water:

1- Increasing the capacity of fish farming per volume unit, which results in more profit with the same capacity.

2- Reducing the risk of aquatic mortality in summer as well as in warm water where the oxygen concentration decreases.

3- Reduction of aquatic waste

4- Prevents the bubble gas disease

5- Increased absorption and digestion of food by aquatic animals

6- Reducing aquatic growth time

Methods for supplying Oxygen in Aquaculture industry

The required monthly oxygen can be supplied through storage capsules, aerators or oxygen generators such as oxygen generators in the centers. The experience of working with these methods engages the user with items such as low safety and risks of using cylinders, their constant movement, the need for manpower, the need for daily and weekly charging and power consumption, high service and maintenance costs and pressure drop and purity.

Oxygenator

An oxygen generator that uses electricity and filtration to produce oxygen
.The advantages of this device are the needlessness for periodic charging and the disadvantages of this product are short 10-year life, expensive repairs, high consumption parts, electricity consumption and high initial capital.

Oxygen Capsules

This is the easiest way to supply the oxygen needed by the ponds- which has the advantage of availability and ease of use. And its disadvantages include high working pressure, labor conflict, low safety and high charging costs.

Aerator

A simple device that combines air with water and increases the oxygen concentration of water.The advantages of this device are ease of use and low initial cost, Its disadvantages include electricity consumption and the unwanted combination of nitrogen with water, which is the main cause of gas bubble disease.

Liquid Oxygen Tank

Liquid oxygen is one of the three physical forms of pale blue oxygen gas with a purity of over 99% at the temperature of about -183 ° C. This highly hydrothermal liquid is used in various industries including industrial, health, medical and laboratory units and is considered as one of the refrigeration gases. Liquid oxygen tank is a mechanical equipment that can store oxygen in liquid form at -183 ° C for a long time and prevent it from evaporating.

The structure of these tanks is such that they are composed of two internal and external tanks. The inner tank is made from stainless steel and the outer layer .The special feature of this equipment is that the temperature inside the tank is very cold (-196) and the outside temperature is ambient temperature (+50) and this tank maintains these liquids with the least heat exchange. (if we fill this tank with ice, 14 years later the water that comes out of this tank will be cold water.)

Knowledge-based Corporation of Pishrun Zamharir Aceman

Pishrun Zamhrir Aceman Company, using the technical knowledge of Iranian engineers and also using the latest equipment in the world, designs and produces cryogenic double-layered tanks made of stainless steel (internal tank) and carbon steel (external tank) with perlite-vacuum insulation between double layersin order to maintain oxygen in liquid form with a very high and constant purity.

Pishrun Zamhrir Aceman Company, using the technical knowledge of Iranian engineers and also using the latest equipment in the world, designs and produces cryogenic double-layered tanks made of stainless steel (internal tank) and carbon steel (external tank) with perlite-vacuum insulation between double layersin order to maintain oxygen in liquid form with a very high and constant purity.

Depending on the type of consumption of these elements in the form of gas, next to these tanks, a vaporizer is used to convert liquid to gas, which is a heat exchanger made of aluminum or stainless steel that converts liquid to gas without the need for electricity and only with air flow.

These tanks are used in industries such as oil, gas and petrochemicals, steel, welding and cutting, foundry, food, aquaculture and many other industries and hospitals.

 

The technical and executive experience of this complex started in 1342 with MAJLESI brand in the field of manufacturing industrial refrigerators and freezers and since 2009 it has been oriented towards the production of advanced cooling equipment. Subsequently, since 1392, Zamharir Aseman Propulsion Company was officially established to operate in the field of very low cryogenic temperatures.

At present, the company is the largest manufacturer of liquid oxygen tanks, liquid nitrogen, liquid carbon dioxide and cryogenic equipment in West Asia with the ability to design and manufacture according to international standards.

 

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