Serious Foaming Problem Cured 19.01.2017 SNF’s customer found that washing a particular recycled aggregate gave a severe foam/scum problem. Stable, troublesome, foam/scum is not unusual when washing recycled aggregates. Depending on the proportions of concrete and clay in the feedstock, foam/scum incidence varies from trivial to severe. The customer was suffering foam/scum overflows, from both the de-sander and from the silt settler. The overflows were unsightly; worse, they had a bad impact on site working conditions. The overflows caused an unwelcome slip hazard, and much extra house-keeping was necessary to clean up afterwards. In addition to the overflows, there were troublesome accumulations of scum at the settler, which demanded time-consuming, labour-intensive, clean-downs.SNF was a

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