Fish Farming of the Future: Water treatment solutions for aquaculture

One billion people around the world depend on fish as their primary animal protein. Over half of this fish is supplied by the global aquaculture industry.

In southern Africa, however, aquaculture remains an emerging industry, with conventional fisheries still producing the majority of fish products, even as many wild fish populations are dangerously overfished. 

Yet there is significant room for growth; the industry has the potential to be an important economic activity that can contribute to increased food security, create employment and ensure the sustainable use of coastal and inland resources to the benefit of local communities.

Across the world, Veolia Water Technologies helps aquaculture companies improve productivity by up to 30% and reduce utility and operating costs, offering the industry’s leading solutions for environmentally responsible and sustainable production.

Designed to optimise the entire water cycle of marine, fresh water and brackish water aquaculture farms with a wide variety of species, Veolia’s modular Recirculating Aquaculture Systems (RAS) provide a highly controlled farming environment based on our innovative recirculation and water treatment process. This controlled aquaculture setting helps optimise growth, feed conversion ratio (FCR) and overall fish survival, helping to overcome the conventional challenges faced by the industry in reaching its full potential:

  • Land and water availability
    A highly efficient aquaculture treatment solution that treats and recirculates over 99% of the process water means significantly reduced water consumption. Efficient facility design and construction and an optimised water cycle yields a higher density of fish products in a reduced physical footprint, lowering the impact on land by up to 50%.

  • Animal welfare and performance
    Greater water quality and improved environmental conditions means healthier and more disease-resistant fish.
  • Operational conditions and technical risk
    Our solutions reliably control water quality conditions, reducing exposure towards outside influences and optimise biological performance with reduced technical risk.

  • Environmental impact, sustainability and regulatory and consumer risks
    Efficient and reliable treatment processes, including sludge and effluent recovery in an over-99% closed loop water reuse system, reduce impact on the natural environment, and help guarantee compliance with reduced regulatory and consumer risks.

  • Efficient handling, logistics and transport
    Geographic challenges make it difficult and expensive for many regions to receive fresh seafood. Our RAS systems allow farmers to achieve a farm-to-table strategy by locating facilities on land near key markets. This reduces shipping costs and shortens delivery timeframes, while offering customers a superior fresh product.

  • Profitability
    With reduced installation and operational costs and lower energy consumption, our prefabricated, modular RAS systems improve the profitability of aquaponics operations. Its water treatment components can accommodate the high feed inputs, growth rates and stocking densities required for maximum financial viability. With an optimised water cycle, these systems require between 250 to 500 litres of water per kilogram of fish.

Veolia Water Technologies aquaculture solutions increase productivity by 30%.

Get in touch with our aquaculture specialists today.


For over 20 years, we’ve supplied the aquaculture industry with solutions and technologies for high-quality, efficient water treatment. With strong R&D capabilities and a global network of business units and proprietary technologies, we work with aquaculture farmers from project concept to implementation and aftersales support.

Key Veolia technologies used in aquaculture water treatment include:

  • Biological treatment – AnoxKaldnes® MBBR (Moving Bed Biofilm Reactor) allows micro-organisms to grow on sheltered surfaces inside moving plastic carriers, creating a continuous biofilm process without any risk of clogging and without the need for back flushing.
  • Solids removal – Following biological treatment, particle separation is achieved through our Hydrotech™ Drumfilters. Hydrotech™ is the leading reference in the aquaculture market, with over 1 000 installation worldwide.


The RAS2020 is a highly compact self-contained production module, with a total footprint of approximately 2 600 m2.

It is designed for a daily feed load of up to 4 000 kg and an annual fish production capacity of 1 200 tons, and is able to accommodate a wide range of fish species, including salmon, trout, tilapia, kingfish, sea bass, catfish and more.

The RAS plant removes organic matter, total ammonium nitrogen, suspended solids, CO2, N2 and harmful bacteria / viruses, as well as optimising pH and alkalinity.

Key RAS2020 benefits:

  • 99.6% of the water is treated and recirculated
  • Up to 50% reduced footprint
  • Operate farms near strategic markets
  • Efficient facility design and construction
  • Reduced operating and utility costs
  • Streamlined fish handling and harvest
  • Proven water treatment processes
  • Optimized feed conversion ratio
  • Reduced carbon footprint

Watch the video to find out more about the RAS2020 system:


Veolia’s Kaldnes® RAS semi-closed loop multi-tank aquacultural system, with aeration and particle removal, is designed to maximise production while reducing pollution and water consumption.

Based on the strong experience of our subsidiaries and technologies like Hydrotech™ Drumfilters and AnoxKaldnes® MBBR, we are able to provide turnkey solutions for all kind of fish species, including fresh, seawater and cold and tropical species.

Watch the video below to learn more about the Kaldnes® RAS system:

Through world-class water purification technologies and expertise, Veolia Water Technologies helps customers in the aquaculture industry optimise productivity and reduce their footprint and environmental impact to improve the profitability of their aquaculture farms.

Need more info on our aquaculture treatment systems? Send us an enquiry here.