Dissolved Air Flotation (DAF)is a method for separating and removing suspended solids from liquid by attachment of micro size air bubbles to the suspended particles. Circular Designs Designs through 50-foot diameter are standard with customized units available up to 100-foot diameter. A wide range of sizes assures the correct operational performance in the most economical construction. Circular units are equipped with a heavy-duty EWT™ drive with overload protection. A variable speed drive or constant speed drive with adjustable timer is provided to control the float removal rate for maximum float concentration. Positive removal of non-floatable materials is achieved by a bottom-raking mechanism, driven by the same driver that operates the float skimmer. Low maintenance and operating costs are provided with simple but rugged design of circular DAF units. There are no stuffing boxes, underwater bearings or chains located below the liquid level. Hydraulic principles of circular units have been demonstrated in many thickening and clarifying applications

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