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Phosphate Recovery

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photo: Albright and Wilson


Photo 1: the cascade of three stirred reactors.



Photo 2: top view of one reactor

Phosphate recovery installation at Putten, the Netherlands (Photos 1 and 2). Phosphates are recovered for recycling, as magnesium potassium phosphate, from 700 000 tonnes/year of calf manure. 
Process: Geochem Research and Delft University Earth Sciences.



Phosphate recovery as struvite (magnesium ammonium phosphate) from food industry waste waters at the Avebe plant, the Netherlands. Process: 150 m3/hour Crystalactor® DHV Water BV, Amersfoort, the Netherlands.

Summary

Why the future for phosphates lies in recycling

  • The need to restore the phosphate cycle

Why the future for phosphates lies in recycling
  • The EC Urban Waste Water Treatment Directive and the protection of surface waters
  • A vision for the future of the phosphate industry

Techniques for P-removal and recycling in waste water treatment
  • Limits to sludge spreading
  • Advanced sewage treatment

Techniques for P-removal and recycling in waste water treatment
  • Chemical precipitation : the P-removal / P-recycling conundrum
  • Biological P-removal : facilitating P-recovery

How does biological P-removal work ?

Two possible techniques for P-recovery
  • Calcium phosphate formation : a raw material for industry as good as phosphate rock
  • Struvite precipitation: making use of a natural phenomenon

  Recycling P : the way forward
  • Application of the EC Urban Waste Water Treatment Directive 
  • Joint research and development between the water and phosphate industries
  • Involvement of the animal waste industry 
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