Supplier of the innovative Moving Bed Biofilm Reactor (MBBR) used for the treatment of water and wastewater. Provide biological wastewater treatment systems with the capability of increasing a BOD plant to complete nitrification by adding only media, retaining screens and additional air to the existing system. Our solutions and especially those based on Moving Bed technology are installed over the whole world.

Company details

Klosterängsvägen 11A , Lund , SE-226 47 Sweden

Locations Served

Our Distributors

Business Type:
Industry Type:
Water and Wastewater
Market Focus:
Globally (various continents)
Year Founded:
10,000,000 - 100,000,000 €

This company also provides solutions for other industrial applications.
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AnoxKaldnes is a global company focusing on biological treatment of industrial and municipal wastewater.

We are unique
Our operations and designs are based on a combination of unequaled knowledge in microbiology, biotechnology and treatment technology. This synergy represents a unique methodology in the business of wastewater treatment, which often is dominated by a more traditional process engineering way of thinking.

AnoxKaldnes technologies have solved customer challenges and been installed in more than 50 different countries due in no small part to a very strong R&D capability.

The core of our technology is the AnoxKaldnes MBBR biofilm process. There is a continuous development of the AnoxKaldnes MBBR biofilm technology and other treatment processes in order to have continuous positive company growth and impact in the field.

Tailor-made solutions
AnoxKaldnes believes that each treatment project is unique and thus, demands its own specially tailored solution. Our experience has been that the best available solutions, based on fundamental knowledge and thorough analysis, are the most economical with long term satisfaction and treatment performance.

Business Concept
The AnoxKaldnes approach to business is simple:

  • To develop and market the best biotechnical processes and products for use in the environmental field
  • To establish for every client the best possible biotechnical solution that mitigates the release of environmentally damaging discharges or remediates contaminated environments
  • To offer services, education and practical testing for biotechnical processes used in the environmental field
  • To perform chemical analyses, degradation and toxicity testing on wastewater, environmental samples and chemical products.

Today's AnoxKaldnes had its start in scientific work at the universities of Lund, Sweden and Trondheim, Norway during the 1980's.
In Lund, the researchers were occupied with biological treatment of a difficult and toxic wastewater from the pulp and paper industry and they attacked the problem with new methods. Difficult problems could be solved and associated technologies could be developed via thorough studies and grasping the underlying microbial treatment processes. The research was very soon converted into full-scale installations. This was the beginning of a new method of dealing with biological treatment, setting the focus on the microbiology and developing processes based on the microorganism's demands and needs. The idea to set up a business according to these principles was aroused and Anox AB was formed at the scientific village Ideon in Lund in 1986.

At the end of the 1980's the MBBR biofilm technology was developed in Trondheim by professor Ødegaard and coworkers. The technology is based on the biofilm principle, which implies that the microorganisms treating the wastewater are grown on the surface of a carrier material in the treatment process. Several associated advantages were realized with the AnoxKaldnes™ biofilm technology compared to other more conventional biofilm processes. The MBBR biofilm technology was patented and, with the objective of commercialization, an agreement was made between the university of technology in Trondheim and the engineering industry Kaldnes in Tønsberg, Norway. This company then started the subsidiary Kaldnes Miljøteknolgi AS in 1989, which was aimed at the MBBR biofilm technology.

Commercial breakthrough
Kaldnes Miljøteknologi attained very quickly considerable commercial success with the MBBR biofilm technology and the British company, Anglian Water, bought Kaldnes in 1994 with the purpose to introduce the technology globally. This led to a fast transfer of the technology to several countries.

At the same time Anox AB perceived the potentials of using the Moving Bed™ biofilm technology for its unique microbiological solutions. They adopted and developed the method for different industrial applications, especially for the pulp and paper industry, which was rewarded with approved patents. Utilizing these fresh ideas, the companies became two of the leaders on the world market in the field of modern high efficiency biological treatment.

Anox and Kaldnes were competitors for a number of years, although the actual number of competitive situations was few. Kaldnes owner, Anglian Water PLC, and Anox did, however, sign a cooperation agreement in year 2000.

The cooperation between Anox and Kaldnes was very prospering and led to an increased international business. Kaldnes started a subsidiary in USA and established agreements with licensees in some twenty countries. Anox opened an office in Russia and started a joint venture in Australia, Anox Oceania, together with the Australian company Wastewater Futures. The two companies started to develop the world market together and their process solutions had soon been sold in some forty countries.

Anox + Kaldnes = AnoxKaldnes
When Anglian Water in year 2002 decide to refine its business and wanted to sell Kaldnes, Anox AB acquired the remaining shares in the company. This purchase was a very important strategic step for Anox. This fusion gathered all rights and references for the Moving Bed™ biofilm technology under the same roof. The two companies complemented each other perfectly: Anox had a very strong department for research and development and Kaldnes had an extensive marketing network. To better represent the merger, all companies in the organization changed their name to AnoxKaldnes in 2004. This name change was another step towards a closer integration between the companies and at the same time were the strong trademarks Anox and Kaldnes maintained.

AnoxKaldnes part of the Veolia group
Since 2007, the AnoxKaldnes has been part of Veolia Water Solutions & Technologies, the technology subsidiary of Veolia Water. The company specializes in the engineering, design and construction of turnkey facilities, and creates technological solutions that are integral to these units.

Veolia Water is a leading operating company in the world for water services. Veolia Water specializes in the outsourced management of the water cycle.

Working together with Veolia, AnoxKaldnes has been able to provide more comprehensive solutions to its global clients, both old and new. The group serves to provide turnkey project capabilities with the complete suite of water treatment products and engineering which many of our customers' desire.


Veolia Water Solutions & Technologies
AnoxKaldnes is a part of Veolia Water Solutions & Technologies, the technical subsidiary of Veolia Water, the water division of Veolia Environnement, the largest environmental company in the world. A specialist in engineering and turnkey design/build projects, Veolia Water Solutions & Technologies also creates a range of technological solutions for both municipalities and industry worldwide.

In Europe, as well as globally, AnoxKaldnes and other subsidiaries of Veolia Water Solutions & Technologies also contribute a unique set of both technology and expertise to create solutions for the entire water cycle.

Veolia Environnement (NYSE: VE and Paris Euronext: VIE) is the world leader in environmental services. By designing and implementing tailored solutions for its clients that combine economic efficiency with control over environmental impacts, VeoliaEnvironnement helps to combat climate change, save natural resources and preserve ecosystems.

With more than 317,000 employees, the company has operations around the world and provides tailored solutions to meet the needs of municipal and industrial customers in four complementary segments:

  • Water management
  • Waste management
  • Energy management
  • Passenger transportation

Zero Accidents - Safety is a Priority at AnoxKaldnes

As the leader in the water and wastewater industry, AnoxKaldnes, as a part of Veolia Water Solutions & Technologies, is committed to safety. It is our priority to maintain the safest possible working environment for all of our employees through our vision and values.

This uncompromising commitment to safety in our actions is the key to achieving our missions and goals.

Customer Focus
Customers must be aware of our commitment to safety and security. We must meet our customer's safety requirements.

Each employee's commitment to safety is an integral part of his/her job and will be a measured factor in their performance.

Technical Excellence and Innovation
Through technical excellence and safety innovation our employees are empowered to control and eliminate hazards or other exposures to prevent illness or injury.

All employees have the right and responsibility to immediately report unsafe or non-compliant conditions, acts or practices.

Through continued safety training, our employees have a clear understanding of our safety policies and procedures. This enables each employee to recognize and avoid unsafe conditions and hazards.

Personal Recognition
Those employees who have achieved outstanding safety performance are recognized.

Cohesion from Diversity
Contributing to the promotion of safety across business units will lead to the cohesion of diversity within the company, our employees, and our customers.


Wastewater treatment with microorganisms
The AnoxKaldnes MBBR technology is at the core of our solutions. The microorganisms treating the wastewater grow on the surfaces of a carrier in the treatment reactor. The flexibility of our patented technology allows the design of very compact and efficient stand-alone MBBR solutions as well as optimal upgrades of other, existing, biological processes, often without the need for new basins. The AnoxKaldnes MBBR technology is patented by AnoxKaldnes.

More than plastics
The AnoxKaldnes MBBR biofilm process is more than just plastic. The vast experience and knowledge in microbiology, hydrau­lics and engineering contained at AnoxKaldnes provides long-term solutions, with the carriers of course being a vital ingredi­ent in the technology.

There are several benefits with a suspended biofilm system. Some of them are increased durability towards toxicity and variable loading, simple operation and a treatment system insensitive of bulking sludge.

There is a continuously ongoing research and devel­opment of AnoxKaldnes MBBR technology. Exist­ing processes are improved and processes for new applications are invented. A broad range of different carrier types have been developed in order to target the specific needs of different solutions. The high number of installations spread over the whole world shows many have discovered the benefits with a bio­film process based on AnoxKaldnes MBBR technol­ogy.

Flexible solution
Our processes based on the AnoxKaldnes MBBR technology are applicable for both industrial and munici­pal wastewater and are used for:

  • BOD removal
  • Nitrification
  • Denitrification
  • Phosphorous reduction

The flexibility of our MBBR processes makes them an ideal solution for new plants or upgrades and expan­sions of older ones.

Some of AnoxKaldnes different MBBR solutions
AnoxKaldnes pure MBBR systems are compact, simple to operate and very efficient for removal of BOD, ammonia and nitrogen. There are, however, many different technologies using the MBBR solution, which are suitable for different situations:

  • The Hybas combination process is utilizing both suspended and attached growth within one and the same reactor. Fast biological processes, such as BOD removal and denitrification, are typically carried out by the suspended phase, while slow microbial transformations, such as nitrification, take place mainly in the biofilm.
  • Hybas biological process is a superior IFAS (Integrated Fixed-film Activated Sludge) from An­oxKaldnes and can be used as a very efficient upgrade of activated sludge plants for enhanced nitrification or total nitrogen removal within existing volumes. Enhanced biological phosphorous removal (EBPR) can also be included.
  • The BAS combination process consists of one or more AnoxKaldnes MBBR units, followed by an activated sludge system. The high rate biofilm stage is designed to pre-treat the wastewater to remove the readily bio-degradable organic matter prior to the acti­vated sludge system. Advantages are dramatically increased capacity, improved process stability and sludge separability.
  • Conversion to a BAS process is an ideal way of upgrading existing activated sludge plants for higher capacity of or­ganic removal and better performance. Furthermore, properly operated, a BAS process will produce dramatically less excess biosludge than a conventional activated sludge process.
  • The LagoonGuard biological process entails a well designed supplementary biofilm solution after the lagoon, which will handle the ammonium and provide some additional COD removal. The upgrade is easy, economical, and compact and requires a minimum level of maintenance.

Resource efficiency and sustainability are driving changes in many businesses...
and AnoxKaldnes, as a part of Veolia Water Solutions & Technologies, is committed to staying at the leading edge of sustainable offerings. Veolia actively pursues a strategy to deliver environmentally conscious and innovative water technologies and solutions, meeting the diverse needs of both municipalities and industry.

This includes project-specific Carbon Footprint Assessments, the creation and use of Veolia Water's Water Impact Index tool, and our expertise in Product & Resource Recovery.

Recognizing the value of water

  • Our Water Impact Index measures human impact on water volume, resource stress and quality, enabling better informed water management decisions.
  • Our extensive experience implementing innovative volume reduction and zero liquid discharge solutions helps our industrial clients reduce costs and meet stringent regulations.