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Operating experience PAC direct dosing at Flos WWTP in Wetzikon


A good two years ago, a powder activated carbon (PAC) direct dosing system was successfully put into operation at the Flos WWTP. The operational experience shows that directly dosing PAC is a reliable approach and that trace substances are readily eliminated.  However, the evaluation of the operating data has shown that there is still room for the optimisation of the elimination of micropollutants, especially in rainy weather, and the choice of PAC also has an influence.