Solving Poor Settlement for Sand & Gravel Quarry 31.10.2017 What leads to poor settlements in lagoons? The presence of very fine and colloidal material in dirty wash water from sand & gravel washing plants often leads to poor settlement in lagoons of deep cone thickeners. Traditionally the dirty wash water from these plants is conditioned with polyelectrolyte or “floc blocks” to aid settlement but when the “fines” content is very high, traditional polymers are often unable to capture enough of these fines to sufficiently clean up the wash water before being recycled back to the wash plant. SNF have successfully implemented alternative conditioning regimes for these“difficult” wash waters that significantly increase the solids capture resulting in clean water being returned to the wash plan

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