The team from Mat-Kuling who will deliver the world's largest prefabricated degassing tower to Arctic Seafarm's facility at Nesna.
Photo: Mat-Kuling
Biggest degassing tower for 25,000t land-based fish farm
Arctic Seafarm's hybrid facility will be among the most efficient of its kind
A team of technicians has arrived at the site of Arctic Seafarm's under-construction facility in Nesna, Norway, where they will install what supplier Mat-Kuling calls the world's largest prefabricated degassing tower for a land-based hybrid flow-through salmon plant. The farm has permission for 15,000 tonnes of standing biomass, which indicates a potential harvest of up to 25,000 tonnes.
The work is carried out together with Eyvi, which is the total supplier of the processing plant.
The project includes 57 degassing towers with diameters ranging from 3.6 metres to 4.2 metres and tower heights between 5.2 m and 6.8 m. The system will process approximately 55,000 cubic metres of seawater per hour for the removal of carbon dioxide (CO2) and nitrogen N2.
The project includes both atmospheric and vacuum-based degassing solutions, and all are equipped with automatic washing systems for stable long-term operation and reduced maintenance.
Assembled on site
The towers are prefabricated at Mat-Kuling's factory, while final assembly, plate bending and welding operations are carried out at Arctic Seafarm, which willp.
Mat-Kuling writes that due to the size of the towers, it is not possible to transport the pre-assembled units over land or sea. The solution is therefore based on modular prefabrication, where the components are assembled on site, a method widely used by Mat-Kuling.
"This project is a good example of how prefabricated and modular solutions enable the installation of very large water treatment systems directly on site. It is expected that Arctic Seafarm Nesna will be among the most efficient of its kind, and it will be an important reference for our further efforts within the aquaculture industry," said Bjørn Dørum of Mat-Kuling Vannbehandling AS.
Important for fish health and water quality
Reducing CO2 in the water through degassing solutions is important when operating facilities such as this one at Arctic Seafarm.
Seawater contains almost 50 times more CO2 than air, and high concentrations can have a negative impact on fish welfare and production conditions. Mat-Kuling writes that removing CO2 contributes to better fish health and welfare, by reducing the risk of physiological stress on the fish.
“Research shows that salmon react negatively to elevated CO2 levels long before visible damage occurs. Removing CO2 reduces stress and contributes to increased growth and well-being in the fish,” the company says.
CO2 removal also contributes to stable and good water quality.
"The facility at Nesna is a flow-through facility, which in combination with effective degassing ensures stable and good water conditions for the fish," writes Mat-Kuling.
