Control and Elimination of Scale 19.04.2017 Formation of scale deposits within sewage sludge dewatering systems can be a source of much costly downtime and maintenance. The Yorkshire Water Waste Water Treatment Plant at Naburn provides facilities for the South York area and had been suffering from this problem for some time. SNF was approached to explore solutions to the problem. Following a site visit and discussions, proposals were put forward to solve the problem by installation of a small dosing system for use with Flosperse 3000 W10. What causes scale? Precipitation of insoluble phosphate salts Struvite: magnesium ammonium phosphate Vivianite: calcium ammonium phosphateCaused by a rise in pH via digestion and loss of CO2 through air expulsion during centrifugation Consequences of scal

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