United Nations
By-products from steel industry for water purification.
by Höganäs AB (Private sector)
Phosphorous are present in many anthropogenic waters with lakes and oceans as final recipients, where phosphorous cause eutrophication. The fact that large and important agriculture areas are placed close to the sea shores, poses a potential conflict between the need to keep the farmlands fertile and the possible phosphorus leakage from these areas. Small private owned sewage facilities is another major area causing emissions of phosphorous to lakes and oceans if no polishing is in use.

Hoganas is engaged in a partnership research project in Sweden (Project MINRENT) to explore the possibilities of purifying water from phosphorus, by using tailored filter materials made from industrial by-products from the Swedish steel and metal industry. The by-products included in the project are different kinds of slags. The partners in the project includes the Swedish steel industry as producers of filter material, manufacturers of filter systems and academia.

Lab and pilot-scale studies of by-products from Hoganas AB have shown that close to 100 % of phosphorus can be removed from water over time by using slag from steel and metal industry as filter material. These materials have also shown capacity to remove high level of nickel, zinc and copper from water.

When using by-products for water purification it will contribute to a decreased eutrophication. In addition, it will also lead to less use of virgin materials (including processing of these materials), that otherwise is used for this purpose.

At end of life, the sauterated filter materials can find use as either fertilizer and soil enricher, or as slag former in the steel and metal production.
Progress reports
By 2025, prevent and significantly reduce marine pollution of all kinds, in particular from land-based activities, including marine debris and nutrient pollution
Type of commitment
  • Other (please specify): Decreased amount of phosphorous to lakes and oceans.
  • Wastewater treatment:
OTHER POLLUTANTS (please specify)
  • Industrial effluent pre-treatment
Hoganas AB will control its production processes and include also the quality of the side stream materials and continuously work on improving its byproducts to turn them into valuable resources such as products efficient for water purification.
Through the deliberate involvement of universities and others, findings from on-going pilot scale operations at Hoganas AB will be publically available for others to take inspiration in developing similar solutions.
Other, please specify
Field trials involving other partners in the value chain including end-users.
Staff / Technical expertise
Internal development work of material and processes.
In-kind contribution
Internal process trials and development.
Basic information
Time-frame: 06/2017 - 12/2020
Hoganas AB
Ocean Basins
  • North Atlantic
Beneficiary countries
Other beneficaries
Contact information
Bjorn Haase, Manager Non Metal Products, bjorn.haase@hoganas.com, +46 70 6564430
Hoganas, Sweden
Other SDGs
United Nations