Technology offer : Biotreatment of contaminated soils via a new co-culture of anaerobic mesophilic bacteria

Technology's description

So far, the known method to biologically eliminate pollutants in a sediment, soil or affluent may not be as cost-efficient and eco-friendly as it is usually required.

The invention described here relates to a co-culture of a particularly resistant bacterium of the Mesotoga lineage and at least one hydrogenotrophic sulfato-reducing bacterium. The process is proved to be a treatment method of heavy metals contaminated sediments. 

This specific coculture of bacteria used here is particularly efficient in the treatment of phosphogypsum, an industrial biproduct formed during the production of phosphate fertilizer when treating apatite and phosphorite with sulfuric acid. Those gypsum can be toxic and/or radioactive and hazardous for the environment. Furthermore, Phosphogypsum' are usually toxic for common bacteria. 

The proposed treatment can be performed at temperatures ranging from 25C to 55C and particularly from 30C to 40C. The receptor element can be Sulfur or heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Sn or Tl). The donor element can be of several forms (such as Lactate, Fructose, Chlorophenolic). 


  • High bacteria resistance & tolerance to the toxic environment ;
  • Treatment of both soils and effluents ;
  • Immobilization & precipitation of metals respectively in soils and effluents ;
  • Easier separation of precipitated metals in the liquid phase ;
  • Waste reclycling, ecological process, environmental friendly approach ; 
  • High treatment performances in terms of metals elimination, using cheap substrates (sugar or wastes).

Ref : OT-00067

Area of activity : ENVIRONMENT

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Industrial applications

  • Soil & industrial effluent treatments - Bioremediation. Treatment of Phosphogypsum.

Intellectual property

  • Patent

Technology transfer

  • Co-development with licensing agreement
  • License


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