WASTE WATER Solutions

Efficient and dependable solution for:

– Wastewater treatment– Valuable material recovery– Water recycling

HUBERDissolved Air Flotation Plant HDF

➤➤➤ HUBER Dissolved Air Flotation HDF for advanced (waste)watertreatment with micro bubbles

scum (flotate) hopper

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chain scraper for scum (flotate) skimming effluent weir

effluent boxfor the supply of pressure water

centrifugal pump

air compressor

wastewater

tube feederpipe-in-pipe system

for non-cloggingdistribution ofmicro bubbles

pressure release valvefor generation of

micro-bubbles

pressurized water line

sediment hopperremoval of settled sludge by an eccentricscrew pump, or alternatively pneumaticallycontrolled valve

lamella separatorfor improved separation efficiency

to sludge thickenere.g. to a ROTAMAT® Screw Press RoS 3

effluent channel

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WASTE WATER Solutions

➤➤➤ Features

The (waste) water to be treated enters the flotation plantvia the tube feedera. The air-saturated water isreleased. The micro bubbles (20 – 40 µm dia.) generatedwhen the pressure is suddenly released are intensivelymixed with the suspended material in a tube feeder(special pipe-in-pipe system)n.The gas bubbles attach to the surface of solids. Due totheir increased buoyancy, the light aggregates of solidsand air bubbles float to the water surface.The blended influent flows upward into the tank of thedissolved air flotation unit where it is evenly distributedover the total tank width. The laminar flow conditionsensure optimum phase separation.The solids/gas flocs rise to the water surface where theyform a scum (or flotate) layer that is skimmed off into theflotate hopperc by a scraperb. The scraper joists withtheir special design dewater the flotate additionally. Theflotate is either collected in a container or by an eccentricscrew pump delivered to further treatment stages (e.g.sludge dewatering with ROTAMAT® Screw Press RoS 3)o.The non-clogging lamella separatore increases theeffective clarifier area, for maximum hydraulic loads on asmall footprint. While the water flows down through thegaps between the inclined lamella plates, buoying flocsrise a short distance and attach at the lower surface ofthe upper lamella and dense particles sink a shortdistance to the upper surface of the lower lamella. Thelamellae retain thin layers until they are grown into thickand compact layers that finally detach from the surfaceand slide quickly up or down along the lamella surface.Detached light aggregates slide up and rise to the watersurface where they form a floating scum layer. Heavysludge aggregates slide and sink down to the bottom ofthe tank into the sediment hopperf from where they areeither removed by an eccentric screw pump or gravitydischarged by means of a pneumatically controlled valve.

The clarified water, after it has passed down through thelamella separator, rises up again through a channelgto an effluent boxh. The water level in the tank and theimmersion depth of the scraper is adjusted by theposition of an effluent weiri.Up to 30 % of the effluent is recirculated for the genera-tion of pressure water. A multi-stage centrifugal pumpjgenerates a pressure of about 6 bar. A compressorkfeeds compressed air (> 12 %) to the pump rotor thatgenerates small bubbles with a large surface for quickwater saturation. Saturation of the water with air iscompleted in a tubular reactorl.The saturated water flows through a single pressurerelease valvem, where the micro bubbles with adiameter of 20 to 40 microns are generated when thepressure of air-saturated water is suddenly released. Inthe tube feedern the micro bubbles thoroughly blendwith the influent to be treated so that all solids get inclose contact with a sufficient number of micro bubbles.

Mobile units for on-site testingOur mobile units permit on-site pilot testing and design ofreliable systems. Our compact test units, including theequipment required for chemical pre-treatment of theinfluent, fit in a 20' container.

➤➤➤ Grease, oil, floating and suspended matter, settling solids,dissolved pollutants

A problem in process and wastewaterWater is a vital commodity which demands economicaluse.Process water is needed in many production processesas a solvent, for production of material, or for cleaningpurposes. Water is recirculated and reused for economicaland environmental reasons. Grease, oil, fat, floating andsuspended solids, settling material, and dissolvedcomponents need to be separated to provide good anduniform water quality. Recovery of valuable product fromthe water may be another additional objective.In addition, clogging and excessive wear of pipelines andother associated equipment is prevented, which increasesthe operating reliability of the production plant.Where used process water is discharged as wastewater,pre-treatment is often required to prevent toxic orotherwise harmful substances (e.g. heavy metals, HC,AOX, etc.) from entering the sewer system and reducethus surcharges and fees.Conventional gravity clarifiers are often incapable toachieve sufficient pre-treatment.Various types of flotation processes have been developed,whereof dissolved air flotation with pressure waterrecirculation has proven most effective.The HUBER Dissolved Air Flotation Plant provides asignificantly improved flotation process with a specialinlet structure that provides optimum control of the flowwithin the flotation tank.Virtually laminar flow conditions in the actual separationarea decisively enhance phase separation. The multistagerotary pump for recycle water saturation with aireliminates the need for costly pressure tanks with highmaintenance requirements. The integral lamellaseparator increases the effective separation area andallows therefore a small and low cost design.

HUBER Dissolved Air Flotation Plants are used for a widevariety of industrial and municipal applications, such as:➤ Slaughterhouses➤ Meat processing and packing➤ Fish processing➤ Dairies➤ Convenience food production➤ Margarine production➤ Oil and fat refineries➤ Canneries➤ Industrial kitchens and canteens➤ Fast food providers➤ Soap works➤ Cosmetics industry➤ Textile industry➤ Chemical industry➤ Petrochemical industry➤ Iron and steel industry➤ Metal processing➤ Galvanizing, electroplating➤ Land remediation➤ Waste management➤ Municipal wastewater treatment

WASTE WATER Solutions

HUBER SEIndustriepark Erasbach A1 · D-92334 BerchingPhone: +49 -84 62 -201 -0 · Fax: +49 -84 62 -201 -810info@huber.de · Internet: www.huber.de

Subject to technical modification1,5 / 4 – 9.2010 – 4.2005

HUBER Dissolved Air Flotation Plant HDF

➤➤➤ System approachWe provide complete systems for mechanical-physical water treatment by combining the HUBERHDF with other HUBER components➤ Chemical pre-treatment by precipitation,

neutralization and flocculation in a tube reactor toimprove separation efficiencies, and even removesome dissolved pollutants

➤ Mechanical pre-treatment withROTAMAT® Micro Strainer Ro 9, orROTAMAT® Rotary Drum Fine Screen Ro 2, orROTAMAT® Complete Plant Ro 5

➤ Treatment of the removed scum and sediment:Sludge thickening with ROTAMAT® Rotary ScrewThickener RoS 2; sludge dewatering with ROTAMAT®Screw Press RoS 3

➤ Complete wastewater treatment:Additional biological treatment withHUBER VRM® membranes (➜ direct discharge).Tertiary filtration with HUBER CONTIFLOW® CFSF

➤➤➤ Improved separation efficiency through chemical pre-treatment

HUBER Dissolved Air Flotation HDF

Influent

The alternative:preliminary

chemical treatment

NeutralizationNeutralization and automatic pH adjustment

PrecipitationTransformation of

dissolved pollutantsinto removable solids

FlocculationGeneration of large andstrong flocs by polymeraddition