Neuer Zeitschriftenbeitrag von Gelhardt et. al 2017

Sediments deposited on road surfaces are contaminated with pollutants; the load of pollution in- creases from coarse to fine particles. When it rains, different fractions of the road-deposited sediments are washed off depending on the rain intensity, the slope of the catchment, and other site-specific factors. This road runoff is often treated using settling processes imple- mented in different types of manufactured treatment devices. These devices can be tested with well-defined artificial test materials to determine the removal efficien- cies of particulate matter in a reproducible manner. However, the suitability of the currently deployed arti- ficial test materials to represent the settling behavior of real runoff particle collectives is largely unknown. In this study, a laboratory method to measure and compare the settling behavior of artificial and real particle collec- tives with a reproducible particle size composition was developed. The particle collectives were obtained from different road surfaces, fractionated into sieve classes, and then recomposed into a defined particle size distri- bution that represented the road runoff. The settling velocity was analyzed in a modified settling column setup under constant conditions. The resulting data form a cumulative curve of the settling velocities for both artificial and real particle collectives. The main result from this work is that the tested artificial material and the recomposed real particle collectives have compara- ble settling behaviors despite different losses on ignition and densities.

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