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Fluid mechanicallyoptimized

Excellent suspensionand homogenizingcharacteristics

Low energyconsumption

Robust construction

Low maintenance

Low operationalcosts

H Y P E R C L A S S I C ®- M i x e r

e v o l u t i o n 6

You can reach us at:

INVENT Umwelt-und Verfahrenstechnik AG

Headquarters:Am Weichselgarten 3691058 ErlangenGermanyFon: +49 (0) 9131 690 98 -0Fax: +49 (0) 9131 690 98 -99E-mail: info@invent-uv.de

Plant 1:Burgstallerweg 1491074 HerzogenaurachGermanyFon: +49 (0) 9132 74 13 70Fax: +49 (0) 9132 74 13 72

Berlin Office:Platanenweg 612437 BerlinGermanyFon: +49 (0) 30 5 34 10 63Fax: +49 (0) 30 5 34 10 63E-mail: jwelzel@invent-uv.de

West Office:Am Steinberg 2352353 DürenGermanyFon: +49 (0) 24 21 88 83 07Fax: +49 (0) 24 21 8 47 86E-mail: plaskaris@invent-uv.de

Benelux Office:Kapitein De Rijkstraat 422583 BK The HagueThe NetherlandsFon: +31 (0) 70 30619 98Fax: +31 (0) 70 30619 97E-mail: mhuijboom@invent-uv.de

US Office:INVENT Environmental Technologies LLC122 Oakwell Farms ParkwaySan Antonio, TX 78218USAFon: +1 210 832 0100Fax: +1 210 568 6136E-mail: info@invent-et.com

worldwideA list of our sales partnersabroad is available by requestor on the internet:

www.invent-uv.de

e v o l u t i o n 6

u m w e l t u n dv e r f a h r e n s t e c h n i k

H Y P E R C L A S S I C ®

i n n o v a t i o n f o r n a t u r e

The C lass i c Mixer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Application Mixing task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mixing and equalization tank Suspension and HomogenizationNeutralization Flash-MixingPre-Mixing of Precipitants Flash-MixingPrecipitation Suspension and HomogenizationCoagulation Suspension and HomogenizationBiological phosphate elimination Suspension and HomogenizationDenitrification Suspension and HomogenizationBOD or COD removal Homogenization and DispersionDisinfection Flash-MixingSludge treatment Suspension and HomogenizationStorage of chemicals/chemical solution Suspension

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The ever growing pollution of our environment is a problem which concerns all of us.

For years water pollution, in particular, has continued to grow in threatening proportions.

Water is turning into a more and more limited resource. As a consequence, forward-looking

technologies are desperately needed for the water and wastewater treatment.

With great commitment INVENT is dedicated to the development and the implementation

of such technologies, thus creating powerful products which contribute greatly

to the preservation of the water quality of our rivers and lakes.

The protection, the preservation and, where necessary, the restoration of our environment

will remain one of the most important tasks of our society in the future.

INVENT takes on responsibility in this field

with innovative environmental and process engineering.

INVENT develops, produces andglobally markets innovative machinesand plants for the treatment of waterand wastewater.

Water and wastewater treatmentplants are usually created as a made-to-measure design and lay-out for aparticular project.Depending on the original situationand the intended treatment, variousprocess engineering steps are com-bined so that the aim of the processengineering is safely within reach.While doing so, the engineer drawsfrom a range of known unit pro-cesses. The most important processesfrom this range are stirring andmixing processes. They play a de-cisive role in nearly all water andwastewater treatment plants.

Below you will find some examplesfor important applications of mixingtechnology in water and wastewatertreatment plants.

The table shown to the right isimpressive proof of the importanceof mixing processes for the waterand wastewater treatment.

The C lass i c –for over 15 years

32 HYPERCLASSIC ®-Mixers in the anaerobic basins in a large wwtp in Vienna, Austria

H Y P E R C L A S S I C ®

i n n o v a t i o n f o r n a t u r e

The C lass i c Mixer

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Application Mixing task. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Mixing and equalization tank Suspension and HomogenizationNeutralization Flash-MixingPre-Mixing of Precipitants Flash-MixingPrecipitation Suspension and HomogenizationCoagulation Suspension and HomogenizationBiological phosphate elimination Suspension and HomogenizationDenitrification Suspension and HomogenizationBOD or COD removal Homogenization and DispersionDisinfection Flash-MixingSludge treatment Suspension and HomogenizationStorage of chemicals/chemical solution Suspension

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

The ever growing pollution of our environment is a problem which concerns all of us.

For years water pollution, in particular, has continued to grow in threatening proportions.

Water is turning into a more and more limited resource. As a consequence, forward-looking

technologies are desperately needed for the water and wastewater treatment.

With great commitment INVENT is dedicated to the development and the implementation

of such technologies, thus creating powerful products which contribute greatly

to the preservation of the water quality of our rivers and lakes.

The protection, the preservation and, where necessary, the restoration of our environment

will remain one of the most important tasks of our society in the future.

INVENT takes on responsibility in this field

with innovative environmental and process engineering.

INVENT develops, produces andglobally markets innovative machinesand plants for the treatment of waterand wastewater.

Water and wastewater treatmentplants are usually created as a made-to-measure design and lay-out for aparticular project.Depending on the original situationand the intended treatment, variousprocess engineering steps are com-bined so that the aim of the processengineering is safely within reach.While doing so, the engineer drawsfrom a range of known unit pro-cesses. The most important processesfrom this range are stirring andmixing processes. They play a de-cisive role in nearly all water andwastewater treatment plants.

Below you will find some examplesfor important applications of mixingtechnology in water and wastewatertreatment plants.

The table shown to the right isimpressive proof of the importanceof mixing processes for the waterand wastewater treatment.

The C lass i c –for over 15 years

32 HYPERCLASSIC ®-Mixers in the anaerobic basins in a large wwtp in Vienna, Austria

H Y P E R C L A S S I C ® H Y P E R C L A S S I C ®

An Overv iewAn Overv iewHYPERCLASSIC ® -Mixer -

e f f i c i ent and f lex ib le

The Task

As the above table shows, mixers forapplications in water and wastewatertreatment are mainly used for sus-pension and homogenization tasksas well as for intensive mixing andflash-mixing. These tasks should beimplemented in a reliable, secureand energy-saving way and withthe lowest possible maintenancerequirement.

With regard to process engineeringthe following demands must be met:

The settling of particles, such asactivated sludge flocs, should be reliably avoided (suspension).

Particles, such as activated sludge flocs, should be distri-buted evenly throughout the wastewater in order, for example,to efficiently reduce nitrogen and phosphate (homogeni-zation).

It must be possible to adjust themixer to a perfect position on the bridge. The mixer should begalvanically separated from thebridge.

The drive design should be robust and rather on the largeside. It should possess a high service factor and its bearingsshould have a calculated mini-mum life expectancy of 100.000hours. Depending on the in-stallation location, further speci-fic demands must be taken intoconsideration.

In the anaerobic and anoxic part of the activated sludge tank,turbulences on the water surfaceshould be reduced to a mini-mum, in order to prevent the transfer of oxygen from the airinto the wastewater.

The energy input should be exe-cuted with as little shear forceas possible, in order avoid thedestruction of the flocs.

Short circuit flows should be avoided.

The reactor behaviour, upon which the process technologicallay-out is based, together withthe mixer design, should be im-plemented in a realistic way.

As a consequence of the abovementioned considerations it is im-portant, from a fluid mechanicsperspective, to take into account thefollowing points when developing amixer:

The mixer-body should be positioned close to the bottom,so that the energy input takes place where the sedimentationof particles should be avoided.

The mixer should be positionedas centrally as possible in the tank, should run slowly and havea large diameter, so that the

energy input takes place in a homogeneous way and the particles can be distributed evenly. A design like this is energy-efficient and low in shearforce.

In order to avoid short circuit flows and the correct display of the desired reactor behaviour,it is necessary to manufacture the mixer in various diametersand directions of rotation.These are then chosen accordingto the tank geometry and the position of the supply and dis-charge pipes.

Finally, when designing the perfectmixer, all mechanical factors mustbe considered also:

The mixer should run smoothlyin order to take the strain off the drive and shaft as well as the bridges. This is achieved bya high number of blades. Two-bladed constructions are the most disadvantageous.

Reaction forces in the vertical direction at the shaft, drive andbridge are to be avoided. Theyresult in a large increase in wear.

Figure 1: Conventional mixer – high reaction forceson drive and bridge (upwards)

Optimal design prevents short circuit flows andguarantees optimal reactor behaviour.

INVENT made a significant contri-bution to the efficiency and cost-effectiveness of such plants byintroducing the hyperboloid mixingtechnology to the market for waterand wastewater treatment over 15years ago. Since then, the hyper-boloid mixing technology has beencontinuously developed and im-proved. Thousands of successfulinstallations in municipal andindustrial water and wastewatertreatment plants world-wide im-pressively demonstrate that thehyperboloid mixing technology hasalready become the industrialstandard in this field of application.With the current version HYPER-CLASSIC

® evo lut ion 6 , the sixth,completely revised and even moreefficient version of the classichyperboloid mixer is now available.

The INVENT HYPERCLASSIC®-Mixer is

a vertical mixer with a hyperboloid-shaped mixer-body, installed closeto the bottom, and a drive mountedin dry position above the water level.Contrary to other products, it wasdeveloped and designed especiallyfor applications in the area of waterand wastewater treatment.

Figure 2: HYPERCLASSIC ®-Mixer – small reaction

forces on drive and bridge (downwards)

All parts submerged in water should be non-corrosive and maintenance-free during their life.

It should be possible to separatethe mixer-body of bigger mixerfrom the shaft for mounting anddismantling purposes.

H Y P E R C L A S S I C ® H Y P E R C L A S S I C ®

An Overv iewAn Overv iewHYPERCLASSIC ® -Mixer -

e f f i c i ent and f lex ib le

The Task

As the above table shows, mixers forapplications in water and wastewatertreatment are mainly used for sus-pension and homogenization tasksas well as for intensive mixing andflash-mixing. These tasks should beimplemented in a reliable, secureand energy-saving way and withthe lowest possible maintenancerequirement.

With regard to process engineeringthe following demands must be met:

The settling of particles, such asactivated sludge flocs, should be reliably avoided (suspension).

Particles, such as activated sludge flocs, should be distri-buted evenly throughout the wastewater in order, for example,to efficiently reduce nitrogen and phosphate (homogeni-zation).

It must be possible to adjust themixer to a perfect position on the bridge. The mixer should begalvanically separated from thebridge.

The drive design should be robust and rather on the largeside. It should possess a high service factor and its bearingsshould have a calculated mini-mum life expectancy of 100.000hours. Depending on the in-stallation location, further speci-fic demands must be taken intoconsideration.

In the anaerobic and anoxic part of the activated sludge tank,turbulences on the water surfaceshould be reduced to a mini-mum, in order to prevent the transfer of oxygen from the airinto the wastewater.

The energy input should be exe-cuted with as little shear forceas possible, in order avoid thedestruction of the flocs.

Short circuit flows should be avoided.

The reactor behaviour, upon which the process technologicallay-out is based, together withthe mixer design, should be im-plemented in a realistic way.

As a consequence of the abovementioned considerations it is im-portant, from a fluid mechanicsperspective, to take into account thefollowing points when developing amixer:

The mixer-body should be positioned close to the bottom,so that the energy input takes place where the sedimentationof particles should be avoided.

The mixer should be positionedas centrally as possible in the tank, should run slowly and havea large diameter, so that the

energy input takes place in a homogeneous way and the particles can be distributed evenly. A design like this is energy-efficient and low in shearforce.

In order to avoid short circuit flows and the correct display of the desired reactor behaviour,it is necessary to manufacture the mixer in various diametersand directions of rotation.These are then chosen accordingto the tank geometry and the position of the supply and dis-charge pipes.

Finally, when designing the perfectmixer, all mechanical factors mustbe considered also:

The mixer should run smoothlyin order to take the strain off the drive and shaft as well as the bridges. This is achieved bya high number of blades. Two-bladed constructions are the most disadvantageous.

Reaction forces in the vertical direction at the shaft, drive andbridge are to be avoided. Theyresult in a large increase in wear.

Figure 1: Conventional mixer – high reaction forceson drive and bridge (upwards)

Optimal design prevents short circuit flows andguarantees optimal reactor behaviour.

INVENT made a significant contri-bution to the efficiency and cost-effectiveness of such plants byintroducing the hyperboloid mixingtechnology to the market for waterand wastewater treatment over 15years ago. Since then, the hyper-boloid mixing technology has beencontinuously developed and im-proved. Thousands of successfulinstallations in municipal andindustrial water and wastewatertreatment plants world-wide im-pressively demonstrate that thehyperboloid mixing technology hasalready become the industrialstandard in this field of application.With the current version HYPER-CLASSIC

® evo lut ion 6 , the sixth,completely revised and even moreefficient version of the classichyperboloid mixer is now available.

The INVENT HYPERCLASSIC®-Mixer is

a vertical mixer with a hyperboloid-shaped mixer-body, installed closeto the bottom, and a drive mountedin dry position above the water level.Contrary to other products, it wasdeveloped and designed especiallyfor applications in the area of waterand wastewater treatment.

Figure 2: HYPERCLASSIC ®-Mixer – small reaction

forces on drive and bridge (downwards)

All parts submerged in water should be non-corrosive and maintenance-free during their life.

It should be possible to separatethe mixer-body of bigger mixerfrom the shaft for mounting anddismantling purposes.

H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

Due to the flow on the water surfacewhich is directed towards the shaft,all particles are distributed evenlythroughout the tank. Finally, in thecentre of the tank the water is againtransported downwards along theshaft. A vortex-shaped main flow isthus created throughout the wholetank, which ensures excellent homo-genization.

The So lut ion The So lut ion

6 out of 116 HYPERCLASSIC ®-

Mixers in a wwtp in Berlin, Germany

Opt ima l des ignguarantees h igh

ef f i c i ency

Schematicalrepresentation of thehyperboloid mixer withindication of thestreamlines

The So lut ion

The INVENT HYPERCLASSIC®-Mixer is

a vertical shaft mixer with a hyper-boloid-shaped mixer-body installedclose to the bottom and a dry-mounted drive. In contrast to otherproducts, it was developed anddesigned especially for applicationsin the area of water and wastewatertreatment.The way the hyperboloid mixerfunctions can be seen in illustrationbelow. The mixer is pictured with itsthree main components, the drive,the shaft and the hyperboloid mixer-body in a typical tank, which,depending on the type of treatmentplant, can be rectangular or round.

Naturally, other shapes of tank arealso possible.The hyperboloid mixer rotates closeto the bottom and its 8 integrated andspecially optimized motion fins thusproduce a bottom flow which isdirected radially outwards. Particularlyat the bottom, this flow is turbulentand thus effectively which whirls updepositions. Along the walls the flowrises upwards and transports allparticles until they are just below thewater surface. On the water surfacethe speed has been reduced to suchan extent that no further turbulencescan be produced and oxygen inputvia the water surface can be effective-ly avoided.

The shape of the hyperboloid mixeris based on complex potential-theoretical calculations. This resultsin a flow pattern, which, in summary,exhibits the following basic ad-vantages:

With regard to both quality andquantity, the produced macro-scale flow has the most favour-able pattern. By actively re-directing the flow on the surfaceof the mixer, friction losses areminimized, thus achieving highefficiency.

The highest velocities and turbulent fluctuating velocitiesare induced at the bottom.This means that the energy inputtakes place directly at the bottom, so that the input energyis specifically used to whirl upand suspend sludge flocs andis not wasted anywhere else.

The flow stays attached to thehyperboloid mixer surface. Flowseparations, eddy formations and thus energy losses are prevented. This also boosts theefficiency.

HYPERCLASSIC®-Mixers operate

completely without pulsation due to the closed shape and the 8 motion fins (high numberof blades).

The uniform, radial flow-off overthe complete mixer body facili-tates a flow, which is largely free of periodic fluctuations. The effect of this flow is that thehyperboloid mixer centers itself.Therefore the forces on the gearand the bridges is small. In addition, no oscillations are transferred to the shaft and thebridges which allows a simpleand economical bridge construction.

All reaction forces on the gearand bridges are axial and directed downwards. The radialforces which are generated arevery small. Therefore mixers with long shafts can also be constructed without problems.

The finely graduated diameterrange along with the selectablerotational direction, especiallyin long tanks with lengthwise through-flow, has big advan-tages with regard to the re-tention time and the flow in tanks of this type. This contri-butes to a high operational safety level.

micro-vortices hyperboloidmixer-body

motion fins

drive shaft

H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

Due to the flow on the water surfacewhich is directed towards the shaft,all particles are distributed evenlythroughout the tank. Finally, in thecentre of the tank the water is againtransported downwards along theshaft. A vortex-shaped main flow isthus created throughout the wholetank, which ensures excellent homo-genization.

The So lut ion The So lut ion

6 out of 116 HYPERCLASSIC ®-

Mixers in a wwtp in Berlin, Germany

Opt ima l des ignguarantees h igh

ef f i c i ency

Schematicalrepresentation of thehyperboloid mixer withindication of thestreamlines

The So lut ion

The INVENT HYPERCLASSIC®-Mixer is

a vertical shaft mixer with a hyper-boloid-shaped mixer-body installedclose to the bottom and a dry-mounted drive. In contrast to otherproducts, it was developed anddesigned especially for applicationsin the area of water and wastewatertreatment.The way the hyperboloid mixerfunctions can be seen in illustrationbelow. The mixer is pictured with itsthree main components, the drive,the shaft and the hyperboloid mixer-body in a typical tank, which,depending on the type of treatmentplant, can be rectangular or round.

Naturally, other shapes of tank arealso possible.The hyperboloid mixer rotates closeto the bottom and its 8 integrated andspecially optimized motion fins thusproduce a bottom flow which isdirected radially outwards. Particularlyat the bottom, this flow is turbulentand thus effectively which whirls updepositions. Along the walls the flowrises upwards and transports allparticles until they are just below thewater surface. On the water surfacethe speed has been reduced to suchan extent that no further turbulencescan be produced and oxygen inputvia the water surface can be effective-ly avoided.

The shape of the hyperboloid mixeris based on complex potential-theoretical calculations. This resultsin a flow pattern, which, in summary,exhibits the following basic ad-vantages:

With regard to both quality andquantity, the produced macro-scale flow has the most favour-able pattern. By actively re-directing the flow on the surfaceof the mixer, friction losses areminimized, thus achieving highefficiency.

The highest velocities and turbulent fluctuating velocitiesare induced at the bottom.This means that the energy inputtakes place directly at the bottom, so that the input energyis specifically used to whirl upand suspend sludge flocs andis not wasted anywhere else.

The flow stays attached to thehyperboloid mixer surface. Flowseparations, eddy formations and thus energy losses are prevented. This also boosts theefficiency.

HYPERCLASSIC®-Mixers operate

completely without pulsation due to the closed shape and the 8 motion fins (high numberof blades).

The uniform, radial flow-off overthe complete mixer body facili-tates a flow, which is largely free of periodic fluctuations. The effect of this flow is that thehyperboloid mixer centers itself.Therefore the forces on the gearand the bridges is small. In addition, no oscillations are transferred to the shaft and thebridges which allows a simpleand economical bridge construction.

All reaction forces on the gearand bridges are axial and directed downwards. The radialforces which are generated arevery small. Therefore mixers with long shafts can also be constructed without problems.

The finely graduated diameterrange along with the selectablerotational direction, especiallyin long tanks with lengthwise through-flow, has big advan-tages with regard to the re-tention time and the flow in tanks of this type. This contri-butes to a high operational safety level.

micro-vortices hyperboloidmixer-body

motion fins

drive shaft

H Y P E R C L A S S I C ® H Y P E R C L A S S I C ®

Des ign and Mater ia l Se lec t ion Des ign and Mater ia l Se lec t ion

The geared motor sits on a mountingbase in a rubber buffer bearing. Thepropagation of sound waves is thusavoided and the complete mixer isthereby galvanically separated fromthe bridge.

ShaftThe shaft provides the connectionbetween the drive and the mixerbody. It transfers the required torque,in order to allow the hyperboloidmixer to rotate.The shaft is manufactured from aspecially developed FRP pipedesigned for the loads which occur.

Des ign and Mater ia l Se lec t ion

As illustrated in the accompanyingblow-up drawing, the hyperboloidmixer is made up of three maincomponents which are preciselyfitted to each other, the drive, theshaft and the hyperboloid mixer-body.

DriveThe drive is positioned above thewaterlevel and is arranged on abridge or mounting bracket whereit is easily accessible for rarelyneeded maintenance work.For wastewater ponds or SBR plantswith varying water levels, the hyper-boloid mixer can also be mountedon a special float.

Only energy-saving and robustgeared motors with reinforcedbearings from renowned manu-facturers are used. Normally, highservice factors are selected and thecalculated bearing life expectancyis more than 100.000 h. Special,customer-specific models can be builtat any time.

S imple , robust andsafe to operate

It is generously dimensioned anddesigned for endurance. Through theuse of the most modern compositematerials, the shaft is very light,extremely corrosion-resistant andflexible. It is particularly easy tomount because of the light weight.All HYPERCLASSIC

®-Mixers can bedesigned without a bearing becauseof their innovative design. The smallbearing forces are transferred to thegeared motor via the shaft andabsorbed there. Consequently, noparts whatsoever which requiremaintenance lie below the water line.

Hyperboloid Mixer-BodyThe hyperboloid mixer-body, deve-loped out of the INVENT laboratoryin accordance with the most up-to-date knowledge on the mechanics offluids, is likewise manufactured usingfiber-reinforced plastic. The use ofthe most modern fiber-reinforcedcomposites also guarantees a high-strength, corrosion-resistant and lightcomponent here.

The hyperboloid mixer body isconnected to the lower end of theshaft by means of a flangeconnection. The INVENT Safety LockTechno logy ® is used for this purpose.

This enables a simple and rapidassembly as well as a simple removaleven after many years of operation.Under operation conditions theconnection is safely protectedagainst self-loosening.

The complete hyperboloid mixer isnot just producing a favourable flowfield but is also absolutely non-clogging because of the optimalshape and the motion fins which areseamlessly integrated in the mixer-body.

The latest development step“evo lut ion 6” uses the newlydeveloped INVENT Progress ive F inTechno logy ®. This technology allowsfor further significant improvementof the efficiency compared toprevious versions.

hyperboloid-mixer-body

shaft

bridge

rubber buffers

drive

mounting base

H Y P E R C L A S S I C ® H Y P E R C L A S S I C ®

Des ign and Mater ia l Se lec t ion Des ign and Mater ia l Se lec t ion

The geared motor sits on a mountingbase in a rubber buffer bearing. Thepropagation of sound waves is thusavoided and the complete mixer isthereby galvanically separated fromthe bridge.

ShaftThe shaft provides the connectionbetween the drive and the mixerbody. It transfers the required torque,in order to allow the hyperboloidmixer to rotate.The shaft is manufactured from aspecially developed FRP pipedesigned for the loads which occur.

Des ign and Mater ia l Se lec t ion

As illustrated in the accompanyingblow-up drawing, the hyperboloidmixer is made up of three maincomponents which are preciselyfitted to each other, the drive, theshaft and the hyperboloid mixer-body.

DriveThe drive is positioned above thewaterlevel and is arranged on abridge or mounting bracket whereit is easily accessible for rarelyneeded maintenance work.For wastewater ponds or SBR plantswith varying water levels, the hyper-boloid mixer can also be mountedon a special float.

Only energy-saving and robustgeared motors with reinforcedbearings from renowned manu-facturers are used. Normally, highservice factors are selected and thecalculated bearing life expectancyis more than 100.000 h. Special,customer-specific models can be builtat any time.

S imple , robust andsafe to operate

It is generously dimensioned anddesigned for endurance. Through theuse of the most modern compositematerials, the shaft is very light,extremely corrosion-resistant andflexible. It is particularly easy tomount because of the light weight.All HYPERCLASSIC

®-Mixers can bedesigned without a bearing becauseof their innovative design. The smallbearing forces are transferred to thegeared motor via the shaft andabsorbed there. Consequently, noparts whatsoever which requiremaintenance lie below the water line.

Hyperboloid Mixer-BodyThe hyperboloid mixer-body, deve-loped out of the INVENT laboratoryin accordance with the most up-to-date knowledge on the mechanics offluids, is likewise manufactured usingfiber-reinforced plastic. The use ofthe most modern fiber-reinforcedcomposites also guarantees a high-strength, corrosion-resistant and lightcomponent here.

The hyperboloid mixer body isconnected to the lower end of theshaft by means of a flangeconnection. The INVENT Safety LockTechno logy ® is used for this purpose.

This enables a simple and rapidassembly as well as a simple removaleven after many years of operation.Under operation conditions theconnection is safely protectedagainst self-loosening.

The complete hyperboloid mixer isnot just producing a favourable flowfield but is also absolutely non-clogging because of the optimalshape and the motion fins which areseamlessly integrated in the mixer-body.

The latest development step“evo lut ion 6” uses the newlydeveloped INVENT Progress ive F inTechno logy ®. This technology allowsfor further significant improvementof the efficiency compared toprevious versions.

hyperboloid-mixer-body

shaft

bridge

rubber buffers

drive

mounting base

H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

The Insta l la t ion The Operat ion

S imp le , prob lem-freeand qu i ck

Low operat iona l costsdue to low energy consumpt ion

The last step consists of screwing thehyperboloid mixer-body to the lowershaft flange. Just a short dry run andthe HYPERCLASSIC

®-Mixer is readyfor operation.

Of course, the hyperboloid mixercan also be mounted and dismantledin a filled tank. In the theoreticallypossible case of a motor or drivedefect, these components can beexchanged without having to dis-mantle the complete mixer.

Low maintenance costs

Due to the location and the excellentaccessibility of the drive this is child’splay. There are no work-intensiveand unpleasant pulling and cleaningjobs, which for example, is generallythe case with submerged drives.Expensive maintenance work, suchas the exchange of mechanical seals,are superfluous, because no partswhich are subject to wear areinstalled below water level.

The Insta l la t ion

Due to the simple construction andthe light weight of the components,the assembly can be carried outwithout big efforts. The hyperboloidmixer is normally delivered to theconstruction site in a disassembledstate. There the shaft is first of allconnected to the drive unit by pullingthe top end of the shaft into thehollow shaft of the drive. Next bothdrive and shaft are placed on topof the prepared stainless-steel threadbolts or adhesion anchors on thebridge or the bracket. Then the driveis aligned and is ready for operationafter the electrical connection andchecking of the oil level.

2 out of 45 HYPERCLASSIC ®-Mixers in a wwtp in Kuwait City, Kuwait

The Operat ion

After a short dry run and a check ofthe direction of rotation the hyper-boloid mixer can start operatingwithout any further work. It isdesigned for permanent operationand does not require any mainte-nance work, except an occasionalinspection of the oil level. Dependingon the type of oil, an oil change iscarried out once every 1 or 2 years.

45 HYPERCLASSIC ®-Mixers in a large wwtp in Kuwait City, Kuwait7 out of 33 HYPERCLASSIC ®

-Mixers in a wwtp in Berlin-Stahnsdorf, Germany1 out of 32 HYPERCLASSIC ®-Mixers in a large wwtp in Vienna, Austria

2 out of 48 HYPERCLASSIC ®-Mixers in a wwtp in

Stockholm, Sweden

H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

The Insta l la t ion The Operat ion

S imp le , prob lem-freeand qu i ck

Low operat iona l costsdue to low energy consumpt ion

The last step consists of screwing thehyperboloid mixer-body to the lowershaft flange. Just a short dry run andthe HYPERCLASSIC

®-Mixer is readyfor operation.

Of course, the hyperboloid mixercan also be mounted and dismantledin a filled tank. In the theoreticallypossible case of a motor or drivedefect, these components can beexchanged without having to dis-mantle the complete mixer.

Low maintenance costs

Due to the location and the excellentaccessibility of the drive this is child’splay. There are no work-intensiveand unpleasant pulling and cleaningjobs, which for example, is generallythe case with submerged drives.Expensive maintenance work, suchas the exchange of mechanical seals,are superfluous, because no partswhich are subject to wear areinstalled below water level.

The Insta l la t ion

Due to the simple construction andthe light weight of the components,the assembly can be carried outwithout big efforts. The hyperboloidmixer is normally delivered to theconstruction site in a disassembledstate. There the shaft is first of allconnected to the drive unit by pullingthe top end of the shaft into thehollow shaft of the drive. Next bothdrive and shaft are placed on topof the prepared stainless-steel threadbolts or adhesion anchors on thebridge or the bracket. Then the driveis aligned and is ready for operationafter the electrical connection andchecking of the oil level.

2 out of 45 HYPERCLASSIC ®-Mixers in a wwtp in Kuwait City, Kuwait

The Operat ion

After a short dry run and a check ofthe direction of rotation the hyper-boloid mixer can start operatingwithout any further work. It isdesigned for permanent operationand does not require any mainte-nance work, except an occasionalinspection of the oil level. Dependingon the type of oil, an oil change iscarried out once every 1 or 2 years.

45 HYPERCLASSIC ®-Mixers in a large wwtp in Kuwait City, Kuwait7 out of 33 HYPERCLASSIC ®

-Mixers in a wwtp in Berlin-Stahnsdorf, Germany1 out of 32 HYPERCLASSIC ®-Mixers in a large wwtp in Vienna, Austria

2 out of 48 HYPERCLASSIC ®-Mixers in a wwtp in

Stockholm, Sweden

H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

Lay-out and Des ign The Laboratory

Numerical simulation of an activatedsludge tank

Lay-out and Des ign

For the lay-out and design of anoptimum mixer it is also essential toconsider the reactor design and anyfurther marginal conditions (such asthe shape of the tank, type andlocation of supply and dischargepipes, physical characteristics of themedia, desired reactor behaviour,etc.). The mixer and the reactor mustform a unit. After an extensiveanalysis of requirements and de-finition of the process engineeringaims, this will be successful only ifthere is a range of innovative tools,measuring data and empirical valuesto fall back on in order to chooseand lay out the perfect mixer.

For both the development and thedetermination of the basis for thelayout of its mixers, INVENT alwaysmakes use of the latest developmentsin research and the associatedtechnologies. Modern laser-Doppler-anemometry (LDA) and ultrasound-Doppler-anemometry (UDA) pro-cesses are therefore used for thedetermination of speed profiles inthe laboratory and in large-scalemodels. In addition to conventionalfluid mechanical methods for scale-up, the most up-to-date numericsimulations (CFD) are applied.

3D-CAD-programs and finite-element-methods (FEM) are used for the mixerdesign.

The application of mixers, however,also demands process engineeringknow-how, so that biological reactorscan function optimally, short circuitcurrents can be avoided and thedesired reactor behaviour isachieved.

The accompanying diagram showsa numerical simulation of an acti-vated sludge tank with multiplethoroughly mixed stirring reactors,which are created by individualHYPERCLASSIC

®-Mixers.

The Laboratory

Apart from standard applications,time and time again very specialterms of reference, tank geometriesor mixing tasks must be mastered.In this case, INVENT can fall back onthe instruments described above, butalso on a very well-equipped mixinglaboratory as well as on spacioustesting facilities which are equippedwith state-of-the-art testing andmeasuring technology.All conceivable configurations canbe replicated to scale and examined.This delivers further fundamental datain addition to the existing foundationfor the layout and can of course alsobe used for the optimization ofplants.

Competent and exper ienced

Cont inous improvementand qua l i ty contro l

Shop test of an HYPERCLASSIC ®-Mixer

Laser-light-sheet flow visualization in the INVENTLaboratories

Velocityin z-direction

Flow direction

y [m] 4

x [m] 40

30

20

10

20

-2-4

z [m]

420

realseparatingwall

virtualseparatingwall

vz=[m/s]

0,172

0,147

0,136

0,126

0,070

0,045

0,019

-0,006

-0,032

-0,057

-0,083

-0,150

-0,185

-0,210

-0,236

-0,261

-0,287

-0,300

-0,336Velocityin z-direction

H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

Lay-out and Des ign The Laboratory

Numerical simulation of an activatedsludge tank

Lay-out and Des ign

For the lay-out and design of anoptimum mixer it is also essential toconsider the reactor design and anyfurther marginal conditions (such asthe shape of the tank, type andlocation of supply and dischargepipes, physical characteristics of themedia, desired reactor behaviour,etc.). The mixer and the reactor mustform a unit. After an extensiveanalysis of requirements and de-finition of the process engineeringaims, this will be successful only ifthere is a range of innovative tools,measuring data and empirical valuesto fall back on in order to chooseand lay out the perfect mixer.

For both the development and thedetermination of the basis for thelayout of its mixers, INVENT alwaysmakes use of the latest developmentsin research and the associatedtechnologies. Modern laser-Doppler-anemometry (LDA) and ultrasound-Doppler-anemometry (UDA) pro-cesses are therefore used for thedetermination of speed profiles inthe laboratory and in large-scalemodels. In addition to conventionalfluid mechanical methods for scale-up, the most up-to-date numericsimulations (CFD) are applied.

3D-CAD-programs and finite-element-methods (FEM) are used for the mixerdesign.

The application of mixers, however,also demands process engineeringknow-how, so that biological reactorscan function optimally, short circuitcurrents can be avoided and thedesired reactor behaviour isachieved.

The accompanying diagram showsa numerical simulation of an acti-vated sludge tank with multiplethoroughly mixed stirring reactors,which are created by individualHYPERCLASSIC

®-Mixers.

The Laboratory

Apart from standard applications,time and time again very specialterms of reference, tank geometriesor mixing tasks must be mastered.In this case, INVENT can fall back onthe instruments described above, butalso on a very well-equipped mixinglaboratory as well as on spacioustesting facilities which are equippedwith state-of-the-art testing andmeasuring technology.All conceivable configurations canbe replicated to scale and examined.This delivers further fundamental datain addition to the existing foundationfor the layout and can of course alsobe used for the optimization ofplants.

Competent and exper ienced

Cont inous improvementand qua l i ty contro l

Shop test of an HYPERCLASSIC ®-Mixer

Laser-light-sheet flow visualization in the INVENTLaboratories

Velocityin z-direction

Flow direction

y [m] 4

x [m] 40

30

20

10

20

-2-4

z [m]

420

realseparatingwall

virtualseparatingwall

vz=[m/s]

0,172

0,147

0,136

0,126

0,070

0,045

0,019

-0,006

-0,032

-0,057

-0,083

-0,150

-0,185

-0,210

-0,236

-0,261

-0,287

-0,300

-0,336Velocityin z-direction

H Y P E R C L A S S I C ® H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

Further INVENT Products

Other Productsand Serv i cesINVENT is the market leader formixers, mixing and aeration systemsand membrane aeration systems forthe water and wastewater treatment.Please do not hesitate to ask forinformation about our additionalproduct lines. We would also behappy to offer you complete systemsolutions for your plants, such as acarefully laid-out and adaptedequipment package. We simulateand optimize your plant with thehelp of appropriate softwarepackages, or else we optimize yourplant or building with regard to fluidmechanics.

INVENT Products wor ldwide

Profess iona l and innovat ive

We are your competent partnerfor all questions on water andwastewater treatment.

aerationtechnology

systemsolutions

software-products

research &development

engineering &consulting

The Serv i ce

How can we support you with theplanning, optimization, moder-nization of your plant, or justgenerally with the realization ofyour ideas? Please ask us aboutit!

In close co-operation with you,the INVENT team will draw up afirst draft and will, if necessary,develop it further together withyou via numerous iteration steps,until all requirements are met.After the order has been placedan experienced team of engineerswill see to it that your project iscarried out on schedule.In accordance with the agreementwe will deliver and install the plantfor you and will also carry out thecommissioning. Our service teamwill reliably take care of allnecessary maintenance work.

Beyond the delivery of componentsand plants we also offer you generaladvisory and engineering servicesin the field of stirring technology.This can be, for example, the layoutor optimisation of a stirrer, or theexperimental examination of astirring tank on a laboratory-scaleor through numeric simulation.

Furthermore, we carry out large-scaleacceptance tests, whereby usuallythe velocity field, the solid matterconcentration distribution and thedetention distribution are examined.

Successfull worldwide

INVENT®, HYPERCLASSIC®, SafetyLock Techno logy ®and Progress ive F inTechno logy® are registered trade-marks of INVENT Umwelt- undVerfahrenstechnik AG.

Chosen References

Berlin Schönerlinde, GER116 HYPERCLASSIC ®-MixersBerlin Stahnsdorf, GER40 HYPERCLASSIC ®-MixersBerlin Münchehofe, GER40 HYPERCLASSIC ®-MixersStuttgart-Mühlhausen, GER12 HYPERCLASSIC ®-MixersKiel, Germany,40 HYPERCLASSIC ®-MixersStockholm, Sweden,48 HYPERCLASSIC ®-MixersBarcelona, Spain,72 HYPERCLASSIC ®-MixersWien, Austria,32 HYPERCLASSIC ®-MixersDornbirn, Austria,72 HYPERCLASSIC ®-MixersZürich, Switzerland,8 HYPERCLASSIC ®-MixersDavos, Switzerland,10 HYPERCLASSIC ®-MixersAmsterdam, The Netherlands,16 HYPERCLASSIC ®-MixersMaastricht, The Netherlands,32 HYPERCLASSIC ®-MixersMasan, South-Korea,104 HYPERCLASSIC ®-MixersKuwait City, Kuwait,45 HYPERCLASSIC ®-MixersYokohama, Japan,12 HYPERCLASSIC ®-Mixers

INVENT Team meeting

H Y P E R C L A S S I C ® H Y P E R C L A S S I C ®H Y P E R C L A S S I C ®

Further INVENT Products

Other Productsand Serv i cesINVENT is the market leader formixers, mixing and aeration systemsand membrane aeration systems forthe water and wastewater treatment.Please do not hesitate to ask forinformation about our additionalproduct lines. We would also behappy to offer you complete systemsolutions for your plants, such as acarefully laid-out and adaptedequipment package. We simulateand optimize your plant with thehelp of appropriate softwarepackages, or else we optimize yourplant or building with regard to fluidmechanics.

INVENT Products wor ldwide

Profess iona l and innovat ive

We are your competent partnerfor all questions on water andwastewater treatment.

aerationtechnology

systemsolutions

software-products

research &development

engineering &consulting

The Serv i ce

How can we support you with theplanning, optimization, moder-nization of your plant, or justgenerally with the realization ofyour ideas? Please ask us aboutit!

In close co-operation with you,the INVENT team will draw up afirst draft and will, if necessary,develop it further together withyou via numerous iteration steps,until all requirements are met.After the order has been placedan experienced team of engineerswill see to it that your project iscarried out on schedule.In accordance with the agreementwe will deliver and install the plantfor you and will also carry out thecommissioning. Our service teamwill reliably take care of allnecessary maintenance work.

Beyond the delivery of componentsand plants we also offer you generaladvisory and engineering servicesin the field of stirring technology.This can be, for example, the layoutor optimisation of a stirrer, or theexperimental examination of astirring tank on a laboratory-scaleor through numeric simulation.

Furthermore, we carry out large-scaleacceptance tests, whereby usuallythe velocity field, the solid matterconcentration distribution and thedetention distribution are examined.

Successfull worldwide

INVENT®, HYPERCLASSIC®, SafetyLock Techno logy ®and Progress ive F inTechno logy® are registered trade-marks of INVENT Umwelt- undVerfahrenstechnik AG.

Chosen References

Berlin Schönerlinde, GER116 HYPERCLASSIC ®-MixersBerlin Stahnsdorf, GER40 HYPERCLASSIC ®-MixersBerlin Münchehofe, GER40 HYPERCLASSIC ®-MixersStuttgart-Mühlhausen, GER12 HYPERCLASSIC ®-MixersKiel, Germany,40 HYPERCLASSIC ®-MixersStockholm, Sweden,48 HYPERCLASSIC ®-MixersBarcelona, Spain,72 HYPERCLASSIC ®-MixersWien, Austria,32 HYPERCLASSIC ®-MixersDornbirn, Austria,72 HYPERCLASSIC ®-MixersZürich, Switzerland,8 HYPERCLASSIC ®-MixersDavos, Switzerland,10 HYPERCLASSIC ®-MixersAmsterdam, The Netherlands,16 HYPERCLASSIC ®-MixersMaastricht, The Netherlands,32 HYPERCLASSIC ®-MixersMasan, South-Korea,104 HYPERCLASSIC ®-MixersKuwait City, Kuwait,45 HYPERCLASSIC ®-MixersYokohama, Japan,12 HYPERCLASSIC ®-Mixers

INVENT Team meeting

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Fluid mechanicallyoptimized

Excellent suspensionand homogenizingcharacteristics

Low energyconsumption

Robust construction

Low maintenance

Low operationalcosts

H Y P E R C L A S S I C ®- M i x e r

e v o l u t i o n 6

You can reach us at:

INVENT Umwelt-und Verfahrenstechnik AG

Headquarters:Am Weichselgarten 3691058 ErlangenGermanyFon: +49 (0) 9131 690 98 -0Fax: +49 (0) 9131 690 98 -99E-mail: info@invent-uv.de

Plant 1:Burgstallerweg 1491074 HerzogenaurachGermanyFon: +49 (0) 9132 74 13 70Fax: +49 (0) 9132 74 13 72

Berlin Office:Platanenweg 612437 BerlinGermanyFon: +49 (0) 30 5 34 10 63Fax: +49 (0) 30 5 34 10 63E-mail: jwelzel@invent-uv.de

West Office:Am Steinberg 2352353 DürenGermanyFon: +49 (0) 24 21 88 83 07Fax: +49 (0) 24 21 8 47 86E-mail: plaskaris@invent-uv.de

Benelux Office:Kapitein De Rijkstraat 422583 BK The HagueThe NetherlandsFon: +31 (0) 70 30619 98Fax: +31 (0) 70 30619 97E-mail: mhuijboom@invent-uv.de

US Office:INVENT Environmental Technologies LLC122 Oakwell Farms ParkwaySan Antonio, TX 78218USAFon: +1 210 832 0100Fax: +1 210 568 6136E-mail: info@invent-et.com

worldwideA list of our sales partnersabroad is available by requestor on the internet:

www.invent-uv.de

e v o l u t i o n 6

u m w e l t u n dv e r f a h r e n s t e c h n i k