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Tertiary Treatment combines chemical pre-treatment (coagulation/precipitation and flocculation) with Dissolved Air Flotation (DAF) and sometimes sand filtration, to enhance the quality of the effluent from a secondary clarifier.  The combined process will substantially reduce the suspended solids content and can also contribute to COD reduction and / or color removal before discharging the effluent into a river or other receiving waters.

1	Chemical Preparation
2	Dissolved Air Flotation
3	Flocculation & Filtration