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®

The Mixer

The Mix ing andAerat ion System

Optimised fluidmechanics, resulting in:

excellent suspensionproperties

low energyconsumption

high longevity

mi

xi

ng

t

ec

hn

ol

og

y

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

The ever increasing strain on our environment is a problem which effects us all.

For years, water pollution, in particular, has reached threatening levels. At the same time

the law makers are constantly setting higher requirements on the quality of the wastewater.

As a result, the application of innovative technology for future-orientated wastewater

treatment is a necessity. With great commitment INVENT is dedicated to the development

of such technology. Consequently products are being produced, which contribute in great

measure to the preservation of our environment. The protection of our environment

from damage due to harmful substances will become an even more

important task in the future. With innovative environmental technology,

INVENT is taking on this responsibility.

H Y P E R C L A S S I C ®

The C lass i c Mixer

Purification of wastewateris an area in which I N V E N Tspecialises. Biological waste-water treatment requiresmixing and aeration devices,which fulfil the task of con-stantly keeping the activatedsludge in motion, to achievehigh purification performance.

HYPERCLASSIC ® is the ClassicHyperboloid Mixer. It isavailable in the followingtwo versions:

as a pure bottom mixer

as a combined mixingand aeration system

Both versions of theHYPERCLASSIC ® fulfil all the re-quirements for a mixing andaeration system in communaland industrial treatment plants:

it uniformly distributesthe activated sludge par-ticles in the wastewaterto efficiently reduce thepercentage of nitrate andphosphate.

it effectively prevents thesettlement of bacteriaparticles in the activatedsludge tank.

The combined HYPERCLASSIC ® Mixing andAeration System achieveshigh oxygen transferduring the decompositionof BOD1 and COD2,nitrification, repectivelydenitrification withintermittent aeration.

F ie lds of App l i cat ion

The HYPERCLASSIC ® BottomMixer inhibits mainly thesedimentation of activatedsludge particles during denitri-fication or biological phos-phate elimination.

Without additional expensiveaeration equipment, the com-bined HYPERCLASSIC ® Mixingand Aerat ion System achieveshigh oxygen input levels du-ring nitrification, respectivelyduring denitrification with in-termittent aeration.

HYPERCLASSIC ® –Ef f i c i ent and F lex ib le

1 Biological Oxygen Demand2 Chemical Oxygen Demand

H Y P E R C L A S S I C ®

Exce l lent Suspens ionPropert ies

The design of the HyperboloidMixer’s body is based onfundamental potential-theoryflow calculations. The specialshape of the mixer creates:

An Overv iew

schematic

representation of

the installed system

and the flow pattern

in the two

operating conditions

(Mixing /

Mixing and

aerating)

micro vortices Hyperboloidmixer

transport ribs ring sparger shear ribs

Denitrification / Stirring(left side)

Nitrification / Aerating(right side)

drive shaft air pipe

a flow, which followsthe mixer's surface, thusminimising separationsand their associatedenergy losses.

H Y P E R C L A S S I C ®

an all-encompassing flowwhich guarantees a com-plete mixing of the tankcontents.

No Odour Prob lems

The transport ribs, integratedin the mixer body, cause anaccelaration of the medium ina radial direction, thereforesupporting the completecirculation of the tank con-tents. Henceforth, a disruptionin the water surface is pre-vented, from which, a mini-misation of air input duringthe denitrification and thephosphate elimination isaccomplished, and the outputof aerosol and resulting odourproblems is avoided.

An Overv iewHYPERCLASSIC® – High E f f i c i ency,

Low Energy Consumpt ion

In operation:

calm water surface duringdenitrification

even distribution of bubbles duringnitrification

an energy concentration,that is deliberately at thetank bottom, where highbottom velocities areneeded to prevent thesettlement of activatedsludge.

H Y P E R C L A S S I C ®

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

-0,336

Flow direction

y [m] 4

x [m] 40

30

20

10

20

-2-4

z [m]

420

realseperatingwall

virtualseparatingwall

Velocityin z-direction

An Overv iew

Innovat iveMix ing Techno logy

Innovative mixing technologynot only comprises the effi-cient control of fluid mechani-cal designs, but also requiresdetailed knowledge of themechanical design of bridges,motors, shafts and connectingelements. Therefore, in addi-tion to the conventional fluidmechanical design methods,which are based on experi-

mental methods, I N V E N T alsouses modern numerical simu-lation methods (CFD1).

3D-CAD-Programs and FiniteElement Methods (FEM) areused for the mixer design.The implementation of mixersalso requires process techno-logy know-how, for the opti-mal functionalitiy of the bio-logical reactors. The figure tothe left shows a numericalsimulation of an activatedsludge tank with multiple com-plete mixing reactors, whichwas created with individualHYPERCLASSIC ® mixers.

1 Computational Fluid Dynamics

Numeric simulation ofan activated sludge tank

H Y P E R C L A S S I C ®

High Oxygen Input

In addition to the mixer, thecombined HYPERCLASSIC ®

Mixing and Aeration systempossesses a ring sparger,which is installed underneaththe mixer body and facilitatesthe uniform distribution of air.During the aeration process,the velocity increases in com-parison to the velocity duringthe mixing process. Thisoccurs with the use of a two

speed motor or a frequencyconverter control. The shearribs, mounted on the circum-ference of the mixer body,chop air or pure oxygen,which is fed through the aera-tion ring, into bubbles with anoptimum diameter of 1.5 to3 mm. These are carried awayby the flow and distributedthroughout the tank, thus crea-ting a large input of oxygen.

By means of a control system,that controls both the air entryas well as the rate of revolu-tions, defined conditions canbe set.

In the case of winteroperations or peakloads, the system canmake additional spaceavailable for nitrification.

It is also optimally suitedfor SBR-plants.

In summer operations, itcan exclusively serve thedenitrification process.

The system is, of course,also applicable towardsnitrification, BOD- andCOD-reduction.

An Overv iew

H Y P E R C L A S S I C ®

In Extreme Cond i t ions

Indust r ia l Wastewater

Industrial wastewater placesextreme demands on aerationsystems. A robust structureagainst harsh operations, pro-blematic wastewater contentand high temperatures belongsto the standards of such asystem. In this area of waste-

water treatment, conventionalmembrane aerators are con-sidered failures due to the sen-sitivity of the material and in-sufficient mixing flows. For thistype of case, I N V E N T specia-lises in and offers for all appli-cation areas a tailor made solu-

tion with HYPERCLASSIC ® Mixingand Aeration Systems. Thiscreates an optimal aeration per-formance with high valuespaired with prominent mixingconsistency.

10 HYPER CLASSIC® mixing and aeration systems of an industrial treatment plant in Belgium

H Y P E R C L A S S I C ®

The Mater ia l

Only selectively chosenmaterials, particularlyfibre-glass reinforcedplastics, are used for thedrive and mixer body.

The surface of the mixerbody is coated with abiologically neutral gel-coat (for the uninhibitedbreakdown of bacteria).

All materials used can berecycled or disposed ofwithout difficulty.

The Bear ing

The HYPERCLASSIC ®

mixer is principallychosen without a bottombearing. The shaftbearing occurs in thegeared motor.

The gear motor is bearedin rubber buffer.

Mixing and aerationsystems usually have anadditional security in-tank steady bearing torestrict the occurrence ofparallel deviation ofthe shaft.

The mixer body andthe optional bearing unitare designed with afavourable flow pattern,thus preventing anyaccumulation areas foragglomerations.

The advantages of theHYPERCLASSIC ® system:

solid

non-corrosive

low maintenancerequirements

high operationalsafety level

high longevity

The Dr ive

The mixing element is driven by a shaft and aparallel shaft gearedmotor, installed in dryconditions.

It is run by exclusive ro-bust geared motors fromrenowned manufacturers,which, depending on thefield of application, canbe supplied completewith control andsequencing units. HYPERCLASSIC ® – Outstand ing

due to Economica l Energy Consumpt ionand Low Operat ion Costs

The C lass i c Const ruc t ion

H Y P E R C L A S S I C ®

Further App l i cat ionPoss ib i l i t i es

Areas of App l i cat ion

Due to its flexibility in dimen-sioning and its outstandingproperties, HYPERCLASSIC ® isperfectly suitable for numer-ous other fields of application:

Nitrification as well asBOD- and COD-reduction

Aerobic-thermophilic treat-ment of sewage sludge

Liquid manure treatment

Coagulants and flockingagents

Buffer-tanks or mixingand equalisation tanks

Storm-water tanks

Chemical industry

Paper industry

Food and drink industry

Biotechnology andpharmaceuticals

Textile industry

Dimens ion ing andConstruc t ion S izes

The systems' dimensions de-pend on the sizes and shapesof the tanks, as well as thecharacteristics of the medium.These properties define themixer diameter (readily avail-able in sizes between 500 mm

and 2.500 mm – other sizesavailable on request), thearrangement of the transportribs and the other parameters.The desired bottom velocitycan be adjusted by thenumber of revolutions.

2 of 48 HYPER CLASSIC® mixers of a treatment plant in Stockholm

H Y P E R C L A S S I C ®

HYPERCLASSIC® is a registeredtrade-mark of INVENT Umwelt- undVerfahrenstechnik GmbH & Co. KG.

HYPERCLASSIC ® can be used forintermittent and alternatingoperations; thus, it is excel-lently suitable to applicationin Sequencing Batch ReactorPlants. In wastewater treat-ment, the Hyperboloid Mixerhas proved its efficiency inlarge wastewater treatmentplants, as well as in small andcompact wastewater treatmentplants for years.

The INVENT Serv i ce

Our I N V E N T team takescare of all details from thedimensioning, the projectplanning, and the installation,to the start-up of operationand service – trouble-freefor you.

6 of 60 HYPER CLASSIC® mixers of a treatment plant in Berlin

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

HC 5

.000

02.

01-5

Epr

inte

d on

chlo

rine-

free

blea

ched

pap

er

We are here for you:

INVENT Umwelt- und VerfahrenstechnikGmbH & Co. KG

CentralAm Weichselgarten 36D -91058 ErlangenFon: +49 (0) 91 31 / 6 90 98 - 0Fax: +49 (0) 91 31 / 6 90 98 - 99

Plant 1Industriestraße 14D -32825 Blomberg

Plant 2Triftstraße 13 - 15D -99631 Weißensee

worldwideA list of our salespartners abroad isavailable by requestor on the internet:

www.invent-uv.de