Aquaculture

RESEARCH SHOWS THAT WATER TREATMENT WITH OZONE INCREASES PRODUCTIVITY AT RAS AQUACULTURE SYSTEMS

Three reasons why ozone in aquaculture improves water quality and increases aquaculture productivity.

As recirculating aquaculture systems (RAS) operate by reusing the fish tank water it is essential to control the water quality. Many studies show that treating RAS systems with ozone increases productivity as fish health and survival are increased.

At RAS the organic load tends to be high and the homogeneous fish stock leads to a high risk of infections and problems with bacteria, fungi, and viruses. Although ozone is not primarily used for disinfection at RAS the reduction of solids and DOC often creates an environment that is less favourable for bacterial growth and thus creates a reduced need for disinfection.

WHY OZONE WORKS

As previously stated, the organic load is a constant concern within RAS, particularly when fish density is high and the water exchange rate is low. There is also a risk of heavy metal and nitrite accumulation.

Ozone can cause fine and colloidal solids to clump or microflocculate, facilitating removal via filtration and sedimentation. Similarly, ozone alters the properties of dissolved organic compounds (DOCs) through oxidation and precipitation, making them easier to remove via biofiltration and sedimentation.

The lower organic load makes the environment less favourable for nitrite, which thrives in waters with high organic loads. Ozone can convert nitrite to nitrate.

DISINFECTION

Bacteria, of course, are a source of concern for fish farmers. Bacteria grow quickly in dirty water and can be quite bothersome if not controlled.

Ozone is a very reliable disinfectant due to its high oxidation potential. However, when it comes to aquaculture, the main benefits of ozone are microflocculation and water treatment. Water quality is still improving significantly. To use ozone as a disinfectant, the dosing must be based on the total ozone demand when dealing with dissolved organics, colloidal solids, nitrate, and disinfection.

The reduction of solids and DOCs frequently creates an environment that is less conducive to bacterial growth, resulting in a reduced need for disinfection.

HOW OZONE WORKS

1. REMOVAL OF COLLOIDAL SOLIDS WITH OZONE MICRO FLOCCULATION

The organic load is a constant concern for RAS systems, especially when the fish density is high and the water exchange rate is low. Ozone has the ability to cause clumping or micro flocculation of fine and colloidal solids, which in turn facilitates removal by filtration and sedimentation.

2. REMOVAL OF DISSOLVED ORGANIC COMPOUNDS AND DISCOLOURATION

Ozone changes the characteristics of the dissolved organic compounds (DOC) by oxidation and precipitation, which makes it easier to remove the COD by biofiltration.

3. TURN LETHAL NITRITE INTO HARMLESS NITRATE WITH OZONE TREATMENT

A high organic load is a favourable environment for nitrite growth. When reducing the organic load with ozone treatment the risk of nitrite growth is also reduced. Ozone also has the ability to oxidize nitrite to nitrate.

Suffer any of the above problems with water quality at your RAS plant? Contact our team at info@ozcon.co.uk

To find out more about how ozone increases productivity in RAS, please read our article published in Global Aquaculture Advocate, Aquaculture Magazine and FishFarmer Magazine.

ozone aquaculture

HOW OZCON CAN HELP YOU INCREASE PRODUCTIVITY WITH OZONE AQUACULTURE WATER TREATMENT.

OZCON offers unique ozone aquaculture solutions for the water treatment of recirculating aquaculture. We offer ozone generators and ozone aquaculture systems that are specially designed for the aquaculture market. The Primozone GM-series ozone generators have several advantages that apply to aquaculture fish farming such as:

  • Compact in size
  • Built-in redundancy
  • Easy to operate
  • Low life-cycle cost
  • Ozone levels are automatically controlled by redox/ORP values in each tank
  • Ozone distribution module that can distribute ozone to several different tanks with individual ozone dosage
Ozone Generators for Fish Farming

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