Circular clarifier
Graver Water Systems

The Graver Reactivator is a high rate, solids contact, sludge recirculation type clarifier that, in minimum time, space and chemical consumption, produces an effluent of the highest quality. It is used principally for clarification, lime softening, silica reduction, or organics reduction of water and wastewater containing suspended solids, color and organic impurities. As such, the reactivator provides a means for chemical addition and mixing, flocculation, and upflow clarification in a single unit.

In operation, raw water, chemicals, and a large quantity of recirculated precipitates are thoroughly mixed in the draft tube (mixing section). These are maintained in intimate contact for a prolonged period under the detention hood (flocculation zone). The contact between the water treatment chemicals and the preformed precipitates causes additional precipitation, and the recirculated floc particles rapidly grow to an exceptionally large size and high density. In addition, the large volume of recirculated precipitates provides an adsorptive surface that maximizes the reduction of color and organics.