Tunnels in Switzerland are regularly cleaned with a surfactant to remove soot, road dirt etc. The resulting wash water is collected in retention basins and then treated. In June, a mobile OKO-aquaclean® system took on the task to treat a part of this water, as the treatment method for the wash water was to be assessed with respect to direct and indirect discharge. By using the operating modes "flotation" and "coagulation", the wash water was easily cleaned - and the results complied with the limits for both direct and indirect discharge. Thus, the OKO-aquaclean® system is fit for being used in Swiss tunnel cleaning.
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