Water Treatments

Pure and simple

Monitoring and maintaining water quality is a crucial part of aquaculture

Water quality and factors like dissolved oxygen levels are vital for fi sh farmers, whether land-based or marine. In this feature, we look at three of the ground-breaking products now on off er.

Alvestad Marin was founded in 2003 by Runar Alvestad, with the aim of providing technical and prac� cal solu� ons for the aquaculture industry. The company is based in Oslo and products range from a robot-operated hatchery system to AutoOx, a fully automated system which regulates oxygen levels in water as part of Alvestad’s “GasBuster” system.

Now, Alvestad Marin has launched an “almost RAS” concept for land-based fi sh farming. The idea is to reduce water usage through a “high re-use” system without a biofi lter. The system can manage water recycling as much as 90-95%, adding oxygen and removing CO2 and par� cles, as well as controlling temperature.

The company says: “There is currently great interest in land-based fi sh farming, and many are considering building new facili� es. As a result of new technical requirements, there are also a number of established

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Replaced water tubes with channels to improve water distribution

The water pipes have been replaced with built-in water channel

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facili� es that are planning upgrades in the near future. If one does not have unlimited access to water, it will be natural to consider solu� ons that provide opportuni� es for increased produc� on capacity and be� er u� lisa� on of the water source as part of the upgrade.”

Also making use of new technology is Aquaturu, a Danish technology company which has developed innova� ve and environmentally friendly water treatment solu� ons that can help secure sustainable land-based fi sh farming.

The company has introduced a new and revolu� onary method to reduce bacteria, viruses, parasites and algae in freshwater fi sh farming facili� es. Aquaturu’s water treatment technology helps eliminate the problems of the land-based aquaculture industry by lowering bacteria, parasites and algae in plants, leading to lower costs and thus higher returns. The result, the company believes, is effi cient sustainable and responsible aquaculture produc� on.

The technology uses a controlled electrical fi eld in the waterfl ow, which kills and prevents the prolifera� on of a wide range of microscopic organisms including bacteria, viruses, parasites and algae. The equipment works even in very dirty water, without a pre-fi ltra� on required, and it means the use of chemical treatments can be greatly reduced. Aquaturu aims to supply units by Q2 of this year.

Biofl o, produced by Warden Biomedia, is a durable, rugged and highly effi cient media

Below: Aquaturu Skaermbilled Opposite: The Alvestad alsmost RAS

For more information contact us today alvestad.com/en

designed to provide a large protected surface area for the biofi lm and op� mal condi� ons for bacteria culture growth. Biofl o’s large openings allow for wastewater to pass freely through the media which helps maintain a healthy and thin biofi lm.

Sterner AS, the largest Norwegian-owned water treatment company which focuses on “There is currently great interest in land-based fi sh farming” aquaculture and RAS (Recircula� on Aquaculture System) technology for fi sh farming selected Warden’s fi lter for an onshore RAS based fi sh farm plant Sterner was building for its customer Eidesvik Se� esfi sk AS.

Sverre H. Amrani, Sterner AS Technical Sales Manager says: “Selec� ng the right media is never an easy task. With Warden’s extensive knowledge of and exper� se in fi lter media, we were able to select the most appropriate media for this plant. With their help we have been able to meet our targets.” FF