Krüger Kaldnes is a specialist within water and wastewater treatment

We service our customers by taking the role of consultant, contractor and supplier of equipment, services and offer a large selection of world-leading technologies.

Krüger Kaldnes was established in 1989. The head office is located in Hinderveien in Sandefjord. In 2007, Krüger Kaldnes became part of the international Veolia group - the leading specialist in water treatment. In 2021, Krüger Kaldnes leaves the aquaculture market and focuses fully on the municipal and industrial sector.

We specialise in treating municipal and industrial wastewater. Our expertise is deliberately focused on preserving the environment: we help you reduce your carbon footprint and optimize your water consumption.

Wastewater produced by industrial processes can be challenging to treat due to its composition and fluctuating pollutant load. In response to increasingly strict regulations and environmental concerns, manufacturers are looking for both effective and sustainable solutions to treat effluent before it is reused or safely discharged into the natural environment. We provide a range of industrial wastewater treatment systems suitable for all major industries.

We create technologies for sustainable development. The Kaldnes™MBBR technology has revolutionised the water and wastewater sector, and has been implemented in over 550 facilities in over 45 countries worldwide.

Case Study
Krüger og Krüger Kaldnes står for leveransen av prosessdesign og mekanisk design. Det nye renseanlegget vil sikre et bedre vannmiljø i Oslofjorden og befolkningsutvikling i kommunen.
Case Study
OHARA er bygget som et komplett renseanlegg tilpasset fremtidig økning i vannbehandlingskapasiteten innenfor et fjellhallareal som ble sprengt ut før ombyggingen. Anlegget er forberedt for en senere installasjon av et biologisk rensetrinn.
Case Study
Prosessdesign, kompakthet og årskostnader var avgjørende for byggherrens valg av løsning. Samtlige prosessenheter på anlegget er plassert over bakken og alle maskinkomponenter er lett tilgjengelige for service og vedlikehold. Prosessen i anlegget er en kombinasjon av Kaldnes®MBBR og Musling®Square.
Case Study
Løsningen på Norefjell renseanlegg er en kompakt, effektiv, robust og driftssikker prosesskombinasjon med biologisk rensing ved Kaldnes® MBBR og separasjonstrinn med kjemisk felling og sedimenteringstanker tilrettelagt for enkel utvidelse.
Krüger Kaldnes employees are waiting for you to join them in their pursuit of a common goal: to value water resources around the world. Join a large company with rich and fulfilling career opportunities, where professional and personal development is prioritised.
Our story
Moving bed biofilm reactor

The story begins in 1985, when Professor Hallvard Ødegaard at the Norwegian University of Science and Technology (NTNU) started researching a new idea for cleaning water.


Prof. Hallvard Ødegaard

The result of his extensive research was a new technology for processing wastewater called Moving Bed Biofilm Reactor (MBBR). Today Kaldnes MBBR is one of the most advanced biological processes for cleaning wastewater and one of the most significant environmental success stories in Norway. Throughout the years, we still have close contact with established research environments such as (NTNU) in Trondheim. 


Patent, awards and acquisitions 

In Tønsberg, Norway 1989, Kaldnes Miljøteknologi was established to commercialize and patent MBBR in 1991. Kaldnes Miljøteknologi originated from a company called Kaldnes Mekaniske Verksted, which dates back to 1899.

In 1994 Kaldnes MBBR was installed in the Olympic City in Lillehammer, Norway, and in 1995, Anglian Water acquired Kaldnes Miljøteknologi. 

Kaldnes MBBR is one the best documented biological processes for cleaning municipal wastewater. There is no exaggeration in claiming that the Kaldnes MBBR process probably is the largest environmental success in Norway within the water and sewerage sector. So much so that Kaldnes Miljøteknologi won the “Stockholm Industry Water Award” in 2001, and in 2002, Anglian Water was acquired by Swedish-based company Anox AB. 

In 2004, Anox AB and Kaldnes Miljøteknologi changed its name to AnoxKaldnes. In 2005, AnoxKaldnes AS acquired JO Water Technology AS and strengthened their position within the market.


Resourcing the world with Veolia

In 2007, the global French group Veolia acquired AnoxKaldnes and in 2008, the company changed its name to Krüger Kaldnes AS.


1985  Professor Hallvard Ødegaard starts researching MBBR
1986  Anox AB was established in Lund in Sverige
1989  Kaldnes Miljøteknologi AS is established in Tønsberg, Norway
1990  The first MBBR facility is delivered
1991  Global patent application is granted for MBBR
1994  Installation of Kaldnes MBBR in the Olympic City in Lillehammer
1995  The company becomes 100 percent owned by Anglian Water
2000  Anox AB in Sverige acquires 15 percent of the Kaldnes Miljøteknologi AS
2001  A new department is established in Rhode Island, USA
2001  Award winner of “Stockholm Industry Water Award”
2002  Anox AB acquires 100 percent of the stocks of Kaldnes Miljøteknologi AS
2004  The company changes its name to AnoxKaldnes AS
2005  AnoxKaldnes AS acquires JO Water Technology AS
2005  A new department is established in Beijing, China
2006  Branch office at Hegnasletta in Sandefjord, Norway
2007  100 percent owned by the French group Veolia Water Technologies
2008  Changes name to Krüger Kaldnes AS, and establishes aquaculture as business area
2009  Celebrating 20 years anniversary
2017  Branch office at Nordre Fokserød in Sandefjord, Norway


Sandefjord HQ

Hinderveien 2
Sandefjord 3223