Dur-flote by Durpro

Dissolved air flotation clarifiers for high suspended solids loads

Dur-flote Dissolved Air Flotation Clarifiers were developed by Durpro to remove high solids loads from water and waste water. The simple yet efficient design makes Dur-flote a very economical choice for removing up to 3000 mg/L of suspended solids. The Dur-flote requires no adjustment after setup. Unlike other DAF systems, the Dur-flote has no service-intensive lamellae and no turbulence in the separation zone, which makes it a simple and effective solids removal and recovery system.

Operation

The Dur-flote system purifies water through the use of dissolved air. The contaminated water is fed into the system, where it is first saturated with dissolved air. For maximum efficiency, a flocculent is then introduced in a static mixer. The treated water then passes through a reaction chamber in the primary vat, where flocculation occurs through the appropriate residence time. The floc rises to the surface, where the floating particles are removed by a paddle wheel. The clarified water then flows over a weir toward the Dur-flote outlet. The water is now ready to be reused. In many cases, the separated material can also be reused, thus resulting in significant savings.

Features

Single moving part ensures low maintenance and turbulence-free separation zone
Minimal instrumentation for easy operation
Absorbs large variations of suspended solids (0 to 3000mg/L) for consistent effluent water quality
Continuous operation with minimum operator attention minimizes downtime, manpower requirements and operating costs
Zero-maintenance air injection system for consistent reliable operation
Simple, efficient, yet flexible flocculent static-mixing system allows use of wide range of flocculents
Adapts to multiple process conditions and adjusts to process swings
The Dur-flote is also available in higher retention-time "round" configurations to suit removal of difficult-to-floc contaminants requiring treatment with polymers and coagulants. Plant intake water applications include fine particle removal and turbidity and color reduction. Waste water applications include primary clarification, reduction of TSS ahead of RO/ultrafiltration and reduction of TSS post secondary treatment.

Typical Applications

White water clarification for reuse in felts, showers, seals, heat exchangers an cooling towers
Fiber, chemicals, fillers and brighteners recovery
A "kidney" for wax & contaminants removal
Water clarification to lower BOD levels for sewer discharge
Reduction of sewer losses
Stabilization of paper machine operation
Lower "fines" run-around in paper machine water loop
Energy economy and lower fresh water consumption