Special adsorbent for the treatment of contaminated rainwater run-off


Rain water run-off from roads and paved areas may, depending on the occupancy of the area, be heavily loaded with pollutants. Thus rain water run-off contains beside alkali and alkaline earth ions also nutrients (phosphate, ammonium), heave metals like lead, arsenic, cadmium, nickel and zinc or organic compounds such as petroleum hydrocarbons, phenols, surfactants, and dioxins and furans.
Conventional rain water treatment plants mainly deposit suspended particles. The above mentioned substances are mostly found in water soluble form and are therefore separated to a comparatively small extent representing a threat to surface and ground water.
The specifically for rain water run-off developed adsorbent “FerroSorp® RWR” now provides an efficient and inexpensive way to further remove pollutants. An application is possible in existing and newly constructed rain water treatment plants and rain water infiltration systems.


FerroSorp® RWR is a mixed granulate of selectively active adsorbents, which was developed specifically for the removal of nutrients and pollutants from storm-water runoff. A careful selection of components allows a combination of purely adsorptive processes for primary fixation of the in rain water dissolved substances with a subsequent regeneration of the sorbent by microbial degradation processes.
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 adsorbent. Hereby an optimized use of FerroSorp® RWR leads to long lifetime of rain water treatment plants and infiltration systems.

Alternative variants 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.

Advantages at a glance

Brochure FerroSorp® RW / RWR [343 KB]