UNI Recirculation Systems

The global leader in advanced recirculation technology...

AKVA group has more than 30 years of aquaculture engineering experience. Our team of world leading experts is renowned
for designing sustainable recirculation systems that are second to none. Having delivered systems globally for more than 15
different species, AKVA group provides optimal water quality conditions for both fresh- and seawater operations. One of the main advantages of the UNI Recirculation Systems is the ability to maintain a perfect environment with superior water quality at minimum cost. All significant water parameters are monitored online and adjusted accordingly; ensuring optimal fish health and growth. This is the foundation for predictable aquaculture production and superior harvest quality for all species.

The first step towards your own UNI Recirculation System is
to enter into a detailed pre-project agreement with us. Once this is completed, then you are all set to go ahead with a successful recirculation project!

Why choose UNI Recirculation Systems?

Whether the plan is to construct a new recirculation system or to upgrade an existing facility, AKVA group always strives to exceed the customer requirements. The most suitable UNI Recirculation solution is carefully designed in close cooperation with the client, ensuring that the production reaches maximum capacity as quickly as possible.

• The revolutionary split-loop design of the system maintains a perfect rearing environment resulting in better growth and maximum profitability.

• AKVA group is the only supplier specializing in recirculation systems for both freshwater and full salinity saltwater with many successful commercial scale projects.

• UNI Recirculation Systems are proven second to none in terms of overall performance and profitability.

• A unique performance warranty ensures that the specified water parameters at a given load are achieved.

• AKVA group’s complete range of products and services, including fully integrated control systems, allows for customers to focus on the production while AKVA group takes care of the technology.

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Uni Recirculation Systems are the most efficient and stable fresh- and seawater aquaculture solutions on the market.

AKVA group's expertise in designing recirculation systems ensures the best growth and health for all freshwater and marine species. 

AKVA group has more than 30 years aquaculture engineering experience that is used to design and supply viable recirculation projects.

Our experienced project managers provide invaluable assistance in the project planning togheter with our customers.

AKVA group offers assistance with applications and regulation compliance in order to obtain necessary farming permits.

Careful elaboration of the production plan and system design is an important part of the planning process.

Recirculation is when a water treatment system substitutes a raw water source in order to regenerate a water quality suitable for fish farming. The main reasons to do this are:
- To replace a limited water source in order to increase fish production.
- To secure pathogen control.
- To control water temperature and save energy.
- To improve logistical control of the production independent of local conditions.
- To improve and optimise growth rates, fish quality and overall production performance.

The waste products which have to be removed in the water treatment plant are: 

- Solid and suspended particles 

- Organic matter 

- CO2 

- Bacteria and Ammonia products.

Furthermore, the consumed oxygen has to be replaced. In a standard recirculation concept, less than 1% of the water has to be replaced with new water for each cycle.

A standard UNI Recirculation System will treat the effluent water from the fish tanks as follows:

1. Mechanical Filter - removing solid particles larger than 50 microns.

2. UNI UV Filter - controlling bacterial dynamics and ecto-parasites.

3. UNI Bio Filter - removing organic matter and ammonia products.

4. UNI Micro Particle Filter - removing suspended particles in the 2-50 micron range.

5. UNI CO2 Stripper - removing CO2, nitrogen and sulphide residues.

This will include a de-nitrification filter for transferring nitrate into free nitrogen. Water usage in a recirculation system range from 30-500 litres for each kilo fish produced, depending on specie and degree of recirculation.

Abalone (Haliotis spp.)

Barramundi (Lates calcarifer)

Cod (Gadus morhua)

Eel (Anguilla anguilla)

Halibut (Hippoglossus hippoglossus)

Kingfish (Seriola lalandi)

Merluza (Merluccius spp.)

Pike Perch (Stizostedion lucioperca)

Salmon/Trout (Salmo salar, Salmo spp.)

Sole (Solea solea)

Bluefin Tuna (Thunnus spp.)

Turbot (Scophthalmus maximus)

... and other fresh- and saltwater species.

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Operation Procedures and Maintenance Manuals are customized for each specific project in order to minimize risk of operator errors and incorrect maintenance.

The extensive training program is carried out on site and at our traning facilities in Denmark. The training program provides the farm technicians with extensive knowledge about fish welfare, operation and understanding of bio filters, and overall insight into the principles of modern "state-of-the-art" recirculation fish farming.

UNI Recirculation System from AKVA group provide fish farmers around the world full confidence and peace of mind!

The Danish companies UNI-Aqua and Danaq became a part of AKVA group in 2007 and 2008. This made AKVA group the global leader alsp in recirculation technology.

AKVA group offers an extensive training program enabling the employees to become familiar and confident operating a modern recirculation fish farm.

AKVA group supplies wide-ranging after sales service to ensure continuous optimal operation of the recirculation system.

AKVA group offer complete projects planning, design, construction and start-up supervision.