FerroSorp® RWR

Special adsorbent for the treatment of contaminated rainwater run-off


Rainwater run-off from roads and paved areas may, depending on the occupancy of the area, be heavily loaded with pollutants. Rainwater run-off contains, for example, alkali and alkaline earth ions, nutrients (phosphate, ammonium), heavy metals like lead, arsenic, cadmium, nickel and zinc or organic compounds such as petroleum hydrocarbons, phenols, surfactants, and dioxins and furans. Conventional rainwater treatment plants mainly deposit the suspended particles. The above mentioned substances are mostly found in water soluble form and are, therefore, separated to a comparatively small extent which represents a threat to surface and ground water. FerroSorp® RWR is designed specifically for this issue by providing an efficient and inexpensive way to further purify the pollutants from rainwater run-off. This technique can be applied in existing and newly constructed rainwater treatment plants and filtration systems.


Pb FerroSorp RWR

Crystal structure of biosorption effective component of FerroSorp® RWR


FerroSorp® RWR is a mixed granulate of selectively active absorbents, which has been developed specifically for the removal of nutrients and pollutants from rainwater runoff. In this way, consistent removal of nutrients (phosphate and nitrogen compounds) and organic water pollutants can be achieved regardless of seasonal temperature fluctuations affecting the biological activity of pollutant degrading microorganisms. Heavy metals are irreversibly bound to the absorbent. An optimized use of FerroSorp® RWR leads to a long service life of rainwater treatment plants and filtration systems.

Alternative types of rain water infiltration

The following charts illustrate a selection of possibilities for the use of special adsorbent “FerroSorp® RWR” concerning the infiltration of rain water run-off.


Use of FerroSorp® RWR in open rain water seepage with upstream sedimentation


Use of FerroSorp® RWR in shaft seepage

Advantages at a glance

  • Affordable and effective improvement of the cleaning performance of rain water treatment plants
  • Seasonal-independent binding of nutrients and organic water pollutants
  • Self-regeneration of the adsorbent by microbiological nutrient and pollutant degradation leads to a very long lifetime