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Phosphate pollution and deficiency

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Unused useful matter sewage treatment plant

Sewagewater contains many nutrients that are not or not optimally used.

Phosphate in surface water is often a source of eutrophication and can cause growth of (blue) algae. In addition, the increasing demand for phosphate causes an imminent shortage.


Reclaiming phosphates by reversible absorption

Iron oxide has good binding possibilities with phosphate. Phosphates are removed from the water via an adsorbent of iron oxide. This adsorbent can be regenerated with an alkaline solution so that it can be reused.

omkeerbare adsorbtie


  • By regenerating the adsorbent, the phosphate can be recovered and no waste product is produced.
  • The regeneration makes it possible to use high-quality and sustainable adsorbents so that the installation can be built smaller and cheaper.
  • The recovered phosphate is available as calcium phosphate and can be used as a raw material by the fertilizer industry.
  • The iron oxide can also be immobilized as nanoparticles on porous carriers (for example activated carbon) so that phosphate removal can be combined with removal of, for example, micro contaminants.


  1. Topic Water quality
  2. Development state 4: Component and/or breadboard validation in laboratory environment
  3. Setting type Rural area
  4. Water type Waste water, Surface water
  5. Project period 1-3 years