The Kalundborg Symbiosis is an industrial ecosystem, where the by-product residual product of one enterprise is used as a resource by another enterprise, in a closed cycle. An industrial symbiosis is a local collaboration where public and private enterprises buy and sell residual products, resulting in mutual economic and environmental benefits.

Systems make it possible, people make it happen.
In the development of the Kalundborg Symbiosis, the most important element has been healthy communication and good cooperation between the participants. The symbiosis has been founded on human relationships, and fruitful collaboration between the employees that have made the development of the symbiosis-system possible. On the right, you can read about some of the most important lessons in creating and maintaining successful symbiosis that we have learned over the last four decades.





Waste stream example

Organic waste from Novozymes is made into agricultural fertilizer.

Waste stream example

Smoke from DONG is made into gypsum at Gyproc.
SO2 + CaCO3 = CaSO4

Result examples (2010)

  • 3 million m3 of water saved through recycling and reuse.
  • Biogas is made out of yeast slurry from the production of insulin.
  • Recycling of 150.000 tons of gypsum from desulphurization of flue gas (SO2) replaces import of natural gypsum (CaSO4).