P-bac process
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P-bac process

Our patented P-bac process offers selective recovery of phosphorus from sludge ash, bed ash and contaminated soils. Fritzmeier Umwelttechnik developed, together with the Institute of Hygiene and Environmental Medicine RWTH Aachen, a highly developed, biotechnological process for selective recovery of phosphate. The P-bac process combines efficient and selective phosphate recovery with bioleaching and therefore is especially suitable for solids with high content of heavy metals.

P-bac process

Basic principle

The selective recovery of phosphate with the P-bac process is realised in two phases. The first step is based on the “bioleaching principle”, which is applied worldwide for the exploitation of metals (e.g. copper, zinc, uranium etc.) in the mining industry. By microbial generation of sulfuric acid, phosphate derivates and heavy metals are dissolved within few hours. The remaining solid matter is separated from the liquid matter and can be disposed for reduced costs.
In a second step the phosphate is selectively separated from the heavy metals. The phosphate-enriched biomass subsequently is separated from the liquid phase and can be processed. Up to 90 % of the original phosphate can be recovered with the P-bac process.


  • Phosphate leaching and recycling in one ste
  • Leaching at low temperatures and atmospheric pressure
  • Microbial production of sulfuric acid and CO2 fixation
  • Heavy metal poor and phosphate enriched product
  • Reduction of dump category of the raw material possible
  • Bioaccumulation of phosphate from waste products
  • Heavy metal separation from waste products

Customized phosphate recovery

We offer our Know-how for biotechnological processes to recover phosphate derivates from solids.

For special requests concerning phosphate derivates in solids we develop, test and optimize innovative solutions for you.

The final product of the P-bac process contains 30-45% P2O5 (Phosphorus pentoxide) and no pathogenic microorganisms.

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