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FLOTTOPAC®Air flotation for purifying wastewater from industrial processes
SEMICONDUCTORSOLARPHARMAPOWER GENERATIONFOOD & BEVERAGEPULP AND PAPERCHEMICALOIL AND GASMININGAEROSPACE AND TRANSPORT
PROCESS
Effective treatment without any rough edgesH+E’s brand name FLOTTOPAC® refers to a space saving methodthat is highly effective in the removal of oils, fats and finely suspended solids in industrial wastewater from various industriesand production processes. Therefore, the FLOTTOPAC® can beused in the food and beverage industry as well as in the oil andgas and the paper industry.
The FLOTTOPAC® flotation in industrial water treatment
he FLOTTOPAC® is based on theprinciple of induced air flotation, a
process that is traditionally used for theseparation of finely dispersed solids orfats and oils from water. As well as that,the separation and thickening of biomassis becoming increasingly important.Compared to alternative separationprocesses such as sedimentation andfiltration, the flotation process has various benefits. It has three main im-portant advantages over sedimentation;first of all, a significantly lower systemsize and thus a saving on constructioncosts and footprint; second, the lowerwater content of the separated sludge;and third, a greater tolerance to fluctua-tions of the inlet stream. If the densityof the material to be separated is less
than or similar to that of water (for example, oil, grease and algae), the option of sedimentation is no longer an alternative.
The process of filtration is only appliedwith low concentrations and is thereforemore likely to be used as a complementto the flotation process. Therefore, theFLOTTOPAC® stage is often a crucialstep within a water treatment plant.Proven applications of FLOTTOPAC®
include:● the separation of oils and fats and
fine solids in a pretreatment● the separation and thickening of bio
sludge● the post-treatment of water from a
biological stage
T
Below the basin cone the
feed and the pressurized water
are fed into the central mixing
chamber
The FLOTTOPAC® process can be divided into threefunctional steps: the mixing zone, the separation zone andthe recirculation for the production of supersaturated water.
Process components
In the central mixing chamber, the basisfor an effective flotation is established.Here microbubbles and particles ordroplets must join. Sufficient residenttime and an optimal flow design resultin high probability of contact betweenmicrobubbles and particles, without de-
struction of already formed particle-bubble aggregates due to shear forces.
In the separation zone, the aggregatesaccumulate as flotate on the surfacewhile the clarified water flows downwardand is drawn off as clear water. The
flotate and bottom sludge accruing insmaller amounts are removed via robust scrapers.
A partial flow of the clarified water isbrought into contact with gas in a saturation system at a pressure of 4–7bar, at which the point the gas is dis-solved. Typically, air is used; but in haz-ardous areas, nitrogen can also be usedas a substitute. The water is then de-pressurised via special valves directlyupstream of the mixing chamber. Thecombination of strong supersaturationand an abrupt depressurisation leads tothe formation of microbubbles usuallywithin a size range of 40–80 microns indiameter. After mixing with the feedwater of the mixing chamber, more than80 million microbubbles per litre areavailable to adhere to particles and droplets.
Recirculation
Clear water
Flotate
Bottom sludge
Feed
Pressure saturationchamber
M
BenefitsThe special design of the mixing chamber ensures an intensive mixing ofthe waste water with the microbubbles, giving FLOTTOPAC® an exceptionallygood separation rate.
In the circular version, the horizontalflow velocity decreases steadily and is onaverage smaller than in a rectangularconfiguration. This extends the degreeof contact time so important for separation.
Bottom and flotate scrapers in circularbasins have proven to be particularlyrobust and low maintenance.
The flotate material has a solids content of up to 6%, which will usuallymake a further thickening treatmentstep redundant
FLOTTOPAC® at the
SHELL refinery
Hamburg-Harburg built
by HAGER+ELSÄSSER
Note: All information in this publication is for informationpurposes only. It must not be interpreted, nor is it intendedto represent any kind of warranty or guarantee.The only legally binding statements are those containedsolely within our quotations. Errors and omissionsexcepted.
1E286 © 2015, H+E GmbH
Contact
HAGER + ELSÄSSER® ranks among the world’s leading
suppliers in the fields of water & wastewater treatment.
Based on its global presence, the HAGER + ELSÄSSER®
has completed projects in more than 50 countries.
Germany
H+E GmbHRuppmannstr. 33bD-70565 StuttgartGermany
Tel.: +49 711 78 66-0Fax: +49 711 78 [email protected]
United Kingdom
H+E UK Ltd.Field Place EstateBroadbridge HeathHorsham RH12 3PBUnited Kingdom
+44 1403 272772+44 1403 [email protected]
Asia
Hager+Elsaesser Sdn Bhd2458 Tingkat Perusahaan 6Kawasan Perindustrian Perai FTZ13600 Prai, PenangMalaysia
+6 04 380 9090+6 04 380 [email protected]
Russia
H+E RUSoffice 405BBusiness-Center «Setun-Plaza»St. Gorbunova 2/3Moscow, Russia, 121596
Tel.: +7 (495) 374 80 91Fax: +7 (495) 374 80 [email protected]
