Adsorption is understood as the accumulation of substances from gases or liquids on the surface of a solid. In water treatment, trace substances are often removed from the water by attaching to a granular filter material.
Wet activated carbon adsorption uses the large surface area of the activated carbon, which can be 400 to 1,600 m2 / g, depending on the type of coal. The contaminated water flows through the activated carbon bed, whereby the trace substances accumulate on the surface of the activated carbon.
ROWAsorb is an adsorption material, a granulated iron oxide hydroxide. In filter systems with ROWAsorb, the water flows through the filter bed, which binds heavy metals and other trace substances to itself and thus removes them from the water.