The two stage reed bed system at Aumont (500 PE), in the French Jura mountains meets stringent discharge standards in phosphorous removal through a third stage filtration with reactive media


  • In operation since: 2012
  • Designed by EPUR NATURE
  • Type of wastewater treated: Domestic
  • Hydraulic load: 75 m³/day
  • Organic load (PE): 500 PE
  • Organic design load (kg BOD/day): 30 kg BOD/day
  • Location: Aumont, Departement of Jura, France
  • Client:  Aumont
  • Stage 1 type: French system
  • Stage 1 surface area (m²): 600
  • Stage 2 type: Vertical flow, unsaturated
  • Stage 2 surface area (m²): 403 m²
  • Needs:

    Two stage reed bed filters fed with raw sewage have become very popular in France for the treatment of waste water in rural areas.  They very efficiently treat organic and nitrogen compounds, but remove little phosphorous, as phosphorous cannot be mineralized and as sludge production is very low, little phosphorous is exported.  However, in the case of Aumont, p-removal was required,  so the wetland treatment plant had to cater for this.

  • Solution:

    In order not to have to install electromechanical equipment and not to have dot to dose chemicals, a third filtration stage, using a reactive media composed of phosphorites, which are natural rock phosphates containing apatite.    

  • Benefits:

    It is aimed that the apatite filter will retain phosphorous for a least 10 years without an  operating costs and that tin the end the phosphorous can be recycled for P-fertilizer production.

Additional Info

  • Hydraulic load: m³/day
  • Organic load (PE): PE
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