Filamentous Bulking 27.10.2016 The presence of filaments in aeration treatment works often leads to “bulking” in final settlement tanks. This bulking leads to solids carry-over into final effluent and, in many cases, consent failure. Historical treatments using biocides or high-acidity inorganic coagulants can now be avoided with the use of the SNF range of FLOQUAT PolyDADMACs – organic coagulants that flocculate the filaments and re-start the settlement process. A single dosing point, either into the aeration discharge or final settlement tank distribution chamber will ensure total solids capture and a resumption of clean final effluent. Dose ranges of 5-15 parts per million are typical to achieve total capture. All filaments eventually report to the Surplus Activated Sludge (SAS) thicken

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