Pollutant Degradation

  Graphic: City view with buildings and vehicles Copyright: © ISAC

To avoid groundwater contamination as a result of pollutant inputs, the infiltrated water must be of sufficiently high quality before it enters the groundwater. For this reason, various research studies have investigated the filtering behavior of infiltration-capable traffic surfaces when exposed to automotive fluids (oil, fuel, brake fluid, etc.). The work demonstrates that such liquids adhere to the aggregates of the layers within the infiltration-capable traffic surface structures and are converted into ecologically harmless compounds by biodegradation processes. These biodegradation processes are realized by microorganisms and generally require aerobic conditions. A sufficiently high and fast drainage of the infiltrated water as well as a good aeration of the layers are (also for this reason) of high importance. Open research questions can be answered very well by cooperations with the environmental sciences.

Another important criterion for the ecologically sensible use of infiltration-capable traffic surfaces is the filtering out and permanent storage of (contaminated) particles. These particles accumulate on the road surface and, in the case of conventional (impermeable) traffic surfaces, are either deposited into the soil or groundwater via the road swales or (in the case of roads with high pollutant accumulation) separated via clarifiers and settling basins. Studies have shown that infiltrative traffic surface superstructures can filter out up to 90% of (contaminated) particles. Stabilization of such processes can be ensured by additional measures such as filter layers or filter fleeces in the transition to the existing subsoil. However, studies on the durability of the open porosity (clogging) and the filter effect are currently still lacking.

 

Sample Projects

Detection of microplastic emissions from road markings - CBI Consortium Project

Environmentally Friendly Road Coverings with exhaust gas aftertreatment by photocatalytic removal of nitrogen dioxide using nanotechnology

Environmentally Friendly Road Cover with photocatalytic removal of nitrogen dioxide and a reduced heat sinking effect