Disinfection

UV-C in Aquaculture

Harmful pathogens are a scourge within the aquaculture industry and are often controlled with antibiotics. This has a negative impact on the water quality and thus also on the quality of the fish. As the aquaculture sector is growing every year, it becomes more important to reduce these pathogens in a sustainable way. 

The answer for this is UV-C disinfection. UV-C disinfection is safe to use and protects against fish diseases without formation of any disinfection by products (DBPs) and ensures a higher survival rate. VGE Pro UV-C systems are therefore very cost-effective for the inactivation of many types of bacteria, viruses and parasites and provide healthy, clear and safe water. This results in a pure, untainted product: better and healthier fish without residual medications. In addition, VGE Pro UV-C systems are suited to combat bacteriological and microbiological hazards and bring water to the quality level the sector is required to meet.

Typically UV systems are installed in recirculation aquaculture systems (RAS) as well as intake and discharge water applications. For intake water, the main purpose is to ensure no external pathogens will enter the facility. 

In circulation systems UV-C enhances permeability of the water and most important reduce microorganisms from replicating. In a closed system with a high density of fish this is extremely important as it is quite easy for a disease to spread if no proper measures are taken.

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Inactivation common bacteria

There are no microorganisms known on the planet that are resistant to UV-C radiation. Depending on the type of microorganism a different UV dose is advised. Common bacteria such as Aeromonas Salmonicida, Aeromonas Hydrophila, Vibrio Salmonicida and Vibrio Anquillarum are quite easily inactivated and need a UV-C dose below 15 mJ/cm². Viruses however, often need a higher UV-C dose. For instance the Infectious Pancreatic Necrosis Virus (IPNV) needs a dosage of about 250 mJ/cm² and some viruses even more! The UV dose (mJ/cm²) is calculated as a multiplication of the irradiance (intensity) and irradiation time.

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Required UV dose

For correctly sizing the UV system at least three factors need to be known; flow rate, transmittance of the water (which tells us how strong the water absorbs the UV light) and required UV dose (or which pathogens should be reduced by how much). Through this model our team can correctly size and select the system according to your specifications. 

 For more information or if you have any questions on how our UV systems can benefit your facility feel free to us and we would be glad to further assist you! See also our complete systems in our shop or at one of our distributors.