In contrast to thermal oxidation processes, adsorption does not involve chemical transformation of pollutants or a significant increase in temperature. Adsorption makes use of the propensity of certain compounds (e.g. activated carbon or zeolite) to attract and adhere gas or vapor to their surface.
The adsorbed pollutants then need to be removed. To this end, adsorption is always followed by desorption. The resulting desorption flow is up to 20 times more concentrated and accordingly has a much smaller volume. This means it can be treated much more cost-effectively.
The Eisenmann adsorption wheel consists of chambers concentrically positioned around a shaft containing activated carbon or zeolite as adsorption material. The exhaust air is directed from above through the adsorption material. While doing so, the solvent molecules settle on the adsorption material. Desorption takes place in a separate section of the rotating wheel. Hot air is passed across the adsorption material in the opposite direction, and the settled pollutants are driven out.
The desorption flow from the adsorption wheel can be fed to a regenerative or a thermal oxidizer. Here, the concentrated desorption flow is treated, with results well under limit values. If there is no surplus energy from production available to heat the desorption flow, recuperative thermal oxidation with a heat recovery system is an ideal option.
Simple integration of the known adsorption technology in the exhaust/supply air system allows E|CON substantial energy savings in painting booths since complex supply air conditioning otherwise required is not necessary in this case. The compact design also cuts space and footprint. Installation and maintenance effort are also reduced decisively by comparison with conventional technology.