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Clarifier is used to remove heavy organic solids in order to reduce the organic loading on the secondary processes. Primary clarifiers are used to slow the velocity of the water to a point where organic solids will settle to the bottom of the tank.

Raw water from the raw water tank gets into reaction tank to react with coagulant and flocculent. It is then pumped into dissolve air floatation (DAF) unit. Floatation is a unit operation used to separate light suspended matter from waste water. Separation is conducted by introducing fine gas bubbles into the liquid phase. The bubbles attach to the particulate matters and raise them to the surface. The floatable scum generated on the top of floatation tank is removed by mechanical scrapping. Permeate from DAF flows into clarified water storage tank. This system is suggested for water and waste water treatment.