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Wastewater treatment and aquaculture


At a time when the global demand for good quality fish continues to grow, aquaculture is the obvious solution. A form of agriculture in an aquatic environment, it is increasingly perceived as an alternative to overfishing and today almost half the fish we eat are raised in this way. 

This fish farming method presents various challenges. Veolia, the industry leader through Veolia Water Technologies and its subsidiary Krüger Kaldnes, offers its expertise in sustainable aquaculture that respects the environment.

In addition to aquaculture, Veolia continues to think about tomorrow's agriculture by experimenting with aquaponics (a farming system combining fish and plants that recreates an ecosystem in an aquarium). In collaboration with the start-up BIGH, the leader in aquaponics, Veolia is looking to deploy this solution in the territories and become a key player.

Who are our customers ? 

The aquaculture industry

The Veolia solution

The Kaldnes® RAS solution

Krüger Kaldnes, a Veolia Water Technologies subsidiary, has developed the "RAS" recirculating aquaculture system, which following a series of purification processes consists of reusing wastewater to supply fish ponds. 

This is accompanied by two main proprietary technologies:

  • biological water treatment to eliminate carbon and / or nitrogen pollution with the AnoxKaldnes™ MBBR (Moving Bed Biofilm Reactor)
  • separation of the particles from fish excrement and excess food with Hydrotech drum filters.

The infrastructure, alarms and water quality are continuously and remotely monitored by a Supervisory Control and Data Acquisition (SCADA) system.

Thanks to this solution, we are able to support a wide variety of fish species - cold water, fresh water, tropical and marine - while guaranteeing our customers high quality support. Having eliminated pollutants the fish are healthier and are not subjected to chemical and antibiotic treatments.

Leader in the sector for more than 20 years, Veolia offers a complete wastewater treatment and recycling solution for aquaculture.

Benefits for our customers

Better resource management

Increase in production

Farming that produces healthier and more resistant fish thanks to expert water quality monitoring 

They chose this solution


Marine Harvest, world salmon farming leader

Design and construction of several salmon production units

After delivering two wastewater recycling plants to Dalsfjord, Veolia installed three more at the Steinsvik salmon production site. Veolia has deployed the Kaldnes® RAS solution for treating fresh and salt water, reusing up to 99% of the water required for aquaculture.



Sundfjord Smolt

Supply of a Kaldnes ™ - RAS system for onshore aquaculture


Veolia supports Sundfjord Smolt in the treatment, reuse and quality management of process water used in land-based aquaculture. This allows 3 million young salmon to be raised in good quality water.


Woodlawn site

Creation of an original aquaculture system, from waste to barramundi

Veolia has organized a genuine food loop on the Woodlawn site: methane from Sydney household waste generates electricity for 2,500 homes and heats the aquaculture pools to 28 °C; the barramundi raised are then sold on the Canberra market (2.5 metric tons per year).