HUBER Dissolved Air Flotation Plant HDF

Effective and efficient wastewater and process water treatment for industrial applications through flotation with micro bubbles

Process water is needed in many production processes as a solvent, for production of material, or for cleaning purposes. Water is recirculated and reused for economical and environmental reasons. Grease, oil, fat, floating and suspended solids, settling material, and dissolved components need to be separated to provide good and uniform water quality.

Recovery of valuable product from the water may be another additional objective. In addition, clogging and excessive wear of pipelines and other associated equipment is prevented, which increases the operating reliability of the production plant.

Where used process water is discharged as wastewater, pre-treatment is often required to prevent toxic or otherwise harmful substances from entering the sewer system and reduce thus surcharges and fees. Conventional gravity clarifiers are often incapable to achieve sufficient pre-treatment. Various types of flotation processes have been developed, whereof dissolved air flotation with pressure water recirculation has proven most effective.

The HUBER Dissolved Air Flotation Plant provides a significantly improved flotation process with a special inlet structure that provides optimum control of the flow within the flotation tank.

HUBER Chemicals Dosing DIGIT-DOSEclose

HUBER Chemicals Dosing DIGIT-DOSE

Chemicals dosing is optimal if the flotation system constantly achieves the required performance without overdosing of chemicals and unnecessarily increasing operating costs. In practice, it proves to be difficult to adjust the chemicals dose due to varying volumes and freights.

Large-dimensioned mixing and balancing tanks are beneficial but can frequently not be installed due to lack of space. Besides, the investments costs are high for the tanks and the accessory equipment required, such as circulation pumps and aeration systems for homogenisation.

The innovative HUBER Chemicals Dosing DIGIT-DOSE allows optimal dosing of the chemicals even with small mixing and balancing tanks. The specially developed system uses a combination of several measuring principles and constantly determines the optimal chemicals dose in real time.

Chemicals consumption, and therefore also operating costs, are reduced to a minimum. Additional positive effects can be seen in the volume of flotate sludge generated.

The production of hydroxide sludge resulting from overdosing of precipitants is effectively avoided. The further utilisation and disposal of the flotate sludge generated is a main cost factor of flotation plants. Furthermore, DIGIT-DOSE makes life easier for the operating staff as the system adjusts automatically to varying wastewater parameters without the need for any manual intervention.

Benefits

Advantages of the HUBER Dissolved Air Flotation Plant

Completely made of stainless steel (1.4571)
With optional chemical treatment stage - increased separation efficiency
Standardized sizes for different applications
Compact design, small footprint
Simple pressure release principle by means of a single valve for maximum operating reliability
Efficient, gentle mixing of the air bubbles into the wastewater flow
Defined tank flow due to the optimal design of the blending and feeder construction in the flotation tank
Large effective clarifier area due to the lamella separator, minimized risk of blocking due to suitably dimensioned gaps between the lamella plates
Generation of saturated pressure water with a multi-stage pump which is not subject to the pressure tank regulation
Experience from hundreds of installations in a variety of fields of application

Additional benefits of the DIGIT-DOSE system

Up to 30% reduction in chemicals consumption
Stable effluent values even for varying volumes and freights
Support and relief for operating staff
Up to 20% reduced disposal costs for flotate sludge
Integrated automatic cleaning of the measuring equipment used without additional fresh or warm water
Low investments costs and space requirements for mixing and balancing tanks
Return on investment within few months, proven with existing plants in operation

Details

System approach

We provide complete systems for mechanical-physical water treatment by combining the HUBER HDF with other HUBER components:

Chemical pre-treatment by precipitation, neutralization and flocculation in a tube reactor to improve separation efficiencies, and even remove some dissolved pollutants

Mechanical pre-treatment with

Treatment of the removed scum and sediment:
- Sludge thickening with ROTAMAT® Rotary Screw Thickener RoS 2 and
- Sludge dewatering with ROTAMAT® Screw Press RoS 3

Complete wastewater treatment:
- Additional biological treatment with HUBER VRM® Membrane Bioreactor (-> direct discharge).
- Tertiary filtration with HUBER CONTIFLOW® CFSF