DE3208025A1 - Appliance for admixing gas or aerating and/or circulating of, or generating flows in, liquids - Google Patents

Abstract

The invention relates to an appliance for admixing gas or aerating and/or circulating of, or generating flows in, liquids or liquids with solids, in which appliance according to the proposal of the main application, the flow is generated by at least one propeller mounted on the free end, immersed in the liquid, of a shaft, and the gas is introduced under pressure into the propeller zone, without a causal connection with the drive of the shaft. This appliance was further improved by means of the gas injection being possible, optionally, in two different ways, firstly through a duct which is arranged along an aerator housing surrounding the shaft and debouches in the propeller zone, and secondly via a connecting orifice, which can be opened and closed as required, off this duct with the interior of the aerator housing and via gas or air inlet orifices in the shaft fashioned as a tubular shaft through said tubular shaft. It has been possible to improve further the gas or air injection and the action at depth of the appliance, and the appliance can be adapted even more effectively to the particular requirement. By arranging the gas or air feed duct along the aerator casing and arranging the low-pressure compressor, which supplies this duct with gas or air, at the aerator casing end section which projects from the liquid, the appliance is provided with a compact, easy to handle, and manoeuvrable design. By virtue of the separate drive for generating the flow and for injecting the gas, this appliance, too, can be used both for nitrification and for denitrification in sewage plants (water treatment plants, biological purification plants). <IMAGE>

Description

The invention relates to a device for gassing or ventilating and / or circulating or generating flows in liquids, in particular in aeration basins for the biological purification of wastewater with at least one shaft that can be driven by at least one drive unit, at least at the free end of which is immersed in the liquid a propeller is arranged, the pitch of which can generate a flow in the direction of continuation of the shaft and, with simultaneous gassing, the gas introduced (e.g. air) can be distributed in fine bubbles, with one or more gas or air supply lines ending in the area of the propeller through which gas ( e.g. air) can be introduced under pressure as required and without any causal connection with the drive of the propeller, according to patent application P 31 44 885.2.

With a device according to the proposal of the main patent application could already have considerable advantages over devices according to the state of the art (US-PS 37 82 702, US-PS 29 28 661, DE-PS 24 61 032) can be achieved. These all start from the principle, through one specially designed propeller or impeller to generate currents in the liquid and through the

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at the same time when there is a static negative pressure within a hollow shaft carrying the propeller To suck in gases or air through the hollow shaft to it to mix with the liquid. Measurements from practice have shown that such devices in the Application in biological wastewater treatment, although the. generate the desired flow, but that the gas entry, especially in relation to the energy expended, it is extremely unsatisfactory that too little Gas or air and thus in particular too little oxygen

j is added to the activated sludge-water mixture. Furthermore, the known devices have the disadvantage that flow generation and gas or air entry do not are separable from each other and thus the optional use of the devices for the kitrification, i.e. aerobic Decomposition of organic substances, including generation of disturbances required with simultaneous entry of air or oxygen and for denitrification, i.e. anaerobic degradation of organic substances, including flow generation in the absence of oxygen is required, is not possible.

According to the proposal of the main patent application, the gas or air entry is no longer as according to the prior art.

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P208Ö25

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Technology through the flow generation at the same time generated negative pressure, but the gas or the air is v / ird through one or more gas or air supply lines, which end in the propeller area, as required and without any causal connection with the drive of the propeller (s) brought up to the propeller with pressure which, in addition to generating a flow, causes a smashing of the gas (air) brought under pressure into very fine bubbles, which are then generated by the Flow and go into solution more easily because of their fine distribution. So on the one hand the gas or air input can be increased significantly while reducing the energy required and on the other hand, an extremely fine-bubble and thus effective gas or air entry into the liquid can be achieved. Since the gas or air entry is no longer causally related to the flow generation and the drive of the propeller shaft and the The drive of the device bringing the gas or the air under pressure is separate from one another both a flow generation with simultaneous gas or. Air entry, as well as a flow generation without Entry of gas or air possible. The device according to the main application is therefore already optional or canceled

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alternating, e.g. for aerobic conditions requiring | Ifitrification and for the anaerobic conditions requiring Denitrification can be used in sewage treatment plants.

The object of the present additional invention is to create a device that is further improved compared to the main application. The aim is, in particular, an even better gas or air entry kit with an even greater depth effect. The device should be even better adaptable to the respective requirement through simple, externally carried out changeover actuations, and it should be easy to handle for use ₍ operable and maneuverable and therefore less bulky as a whole; its design should also be simplified and the design more compact. All other advantages achieved with the device according to the main application should at least be preserved.

According to the invention, this is achieved by

- That the shaft is a known hollow shaft, which in a known manner in its other, the The end section facing the drive unit has at least one gas or air inlet opening,

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320802:

that the hollow shaft in an elongated, sealed on the side of the drive unit against the hollow shaft The ventilator housing revolves and from its immersed in the liquid, open to the front End section protrudes by a certain amount,

that on this protruding from the ventilator housing At the end of the hollow shaft at least one, preferably two, propellers at a short distance from each other (a few cm) and are mounted a short distance from the opening of the ventilator housing,

that along the wall of the ventilator housing a gas or gas duct extending almost over its entire length Air supply channel is provided which is closed at its own end immersed in the liquid, but immediately behind the opening of the ventilator housing through an opening connection to the interior of the Has the ventilator housing and at its other end with the discharge opening of a gas (e.g. air) below Pressure-releasing device is connected,

and that the duct at its connection point with this device in the area of the gas or air inlet opening (s) the hollow shaft has an opening to the interior of the ventilator housing, which by means of

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a slide can be opened or closed as desired.

In addition to those achieved with the device of the main application Advantages allows the device further developed according to the present invention, the gas or the Air may be introduced on two different areas, for which only one slide has to be operated. Is the Opening of the gas or air supply duct to the interior of the ventilator housing in the area of the gas resp. Air inlets the hollow shaft is closed by the slide, so the gas or /. the air exclusively brought in through the channel running along the ventilator housing and passes through its opening behind the opening of the ventilator housing, supported by the negative pressure generated by the propeller or propellers, in the propeller area and for fine-bubble distribution in the medium. Will the above When the opening is released by the slide, a major part of the gas introduced under pressure arrives (e.g. air) first into the interior of the ventilator housing and, supported by the negative pressure generated by the propeller or propellers in the hollow shaft

OT

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the gas or air inlet openings and through the hollow shaft into the medium. With a main gas entry The gas (e.g. air) can flow through the hollow shaft as a tightly bundled, long-reaching jet into the medium which is carried away by the flow generated by the propeller (s). The device thus, if necessary, allows intensive dismantling

_{n DD} . To give preference to,, by the or, the _T Prpp £ ller _n or the and swirling of the introduced air / particularly far-reaching, bundled air jet with greater depth effect.

Due to the arrangement of the gas or air supply duct along the aerator housing de construction of the device is simplified and its construction compact.

The device releasing the gas (for example air) under pressure is preferably a low-pressure compressor (fan or blower), which is mounted on the end of the ventilator housing protruding from the liquid.

Since the problem with the generation of disturbances by the propeller In the propeller area and in the hollow shaft, the negative pressure simultaneously generated the gas or air entry through the Feed paths supported, can with only a little over-

printing performance and thus energy-saving a satisfactory one Gas or air entry can be achieved. The arrangement of the low pressure compressor on the fan housing promotes a compact design and ease of use and manageability when using the device.

The low-pressure compressor is advantageously supported by a protective hood that can be placed on the ventilator housing protected.

The slide for opening and closing the opening between the gas or air supply duct and the ventilator housing nuncrer drunk in the area of the gas or air inlet. • the hollow shaft can be a hinged slide which is rotatably mounted about a bolt and which by means of a lever can be operated from the outside.

Preferably, the total passage area of the gas or. Air inlet openings of the hollow shaft larger than the clear cross-sectional area of the hollow shaft. This will avoids unnecessary, additional resistance to the gas or air flow next to the pipeline

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j. resistance of the hollow shaft and the frictional resistance of the

I opposed to air or gas.

] The air inlets in the hollow shaft can be used as

Slots in the form of elongated holes can be formed by

j which preferably four on the circumference of the hollow shaft symmetrize

! are arranged. Each elongated hole is preferably approx.

j 8 cm long and approx. 2 cm wide. The hollow shaft has one

¹ inside diameter of approximately 2 ¹ '(inches).

; The fan housing is preferably rectangular

: or square cross-section, and the low pressure

I denser can then be beneficial on top of the

! Be mounted on the ventilator housing, while the gas resp.

; Air supply duct along the wall of this top

^ runs.

• The channel is also preferably rectangular

\ Cross section of, for example, approx. 30 χ 40 mm.

The rectangular design of the ventilator housing and the gas or air supply duct results in construction and simplifies the construction of the device.

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COPT

In a preferred embodiment of the new device, the low-pressure compressor (fan, blower) has a power consumption of approx. 370 V / att and only a low overpressure output of approx. 112 mm V / S with a delivery rate of approx. 650 m / hour without counter pressure.

This increased power compared to the fans of the older proposal allows the device to be proportionately steeply immersed in the medium (water / water), and there can be more deep aeration (7 to 8 m deep). Tests and measurements have shown that with the preferred embodiment: compared to the devices of the prior art up to 20 times the amount of gas or air with the same or even lower energy expenditure entered into the liquid can be.

In a preferred embodiment of the new device can be directly on the underside of the section of the aerator housing that is immersed in the liquid an opening in the form of a cutout can be provided behind the opening of the ventilator housing, which with the help of a rod and a slide v.'ahl-

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open and close wisely. By opening this slide, the generated by the propeller or propellers Vacuum are increased, so that substantially ..! Sshr forward movement of the air with corresponding Depth effect is achieved.

The diameter of the propeller (s) is preferably slightly smaller than the diameter or the (smaller edge length of the opening of the ventilator housing; therefore are the power generation and the gas or air input supports.

Further details and advantages of the invention emerge from the following description of a preferred one Exemplary embodiment of the invention based on the attached drawing.

1 shows a longitudinal section through a preferred embodiment of the device according to the invention.

Fig. 2 shows a perspective view of an embodiment of the invention with diagonally from the front on the one in operation in the liquid

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RIGINAL

COPY

submerged part of the device directed line of sight, which is a special detail this embodiment can be seen.

An electric motor 1 drives a shaft, which is called a hollow shaft 2 is formed and rotates within the elongated aerator housing 3 concentrically to its center line. The ventilator housing 3 of the device has a preferably rectangular or square cross section and is through a conical intermediate section 3a to its: an end portion 3b expanded towards a larger cross-section. At the openings of this enlarged end section 3b of the aerator housing 3, the electric motor 1 is mounted in a sealing manner (by means of a flange and rubber seal). ITaIy of the liaison office of the ventilator housing 3 and electric motor 1, the generally rigid device is preferably air. Electric motor 1, v.'ie shown in the drawing, on a suspension 4 around a transverse to the center line of the device Axis pivoted. The suspension 4 in turn is connected to a rigid substructure 5 of the device rigidly connected. With the free end of the other, the smaller cross-section having section 3c of the Ventilator housing 3, the device immerses as intended under a certain, other of the suspension 4 adjustable Angle of attack into the liquid. The loading

Fan housing 3 is immersed in the liquid on this The end is open, and the hollow shaft 2, which extends through the entire aerator housing 3, protrudes through this opening 6 still out of the ventilator housing 3 by a certain amount. On this free one, from the fan housing 3 protruding end of the hollow shaft 2 is at least one propeller 7 in only a small distance to Opening 6, in the illustrated embodiment, there are two Propellers 7 and 8 at a short distance from one another and at a short distance from the opening 6 (ir. Area of venigen cn; attached one behind the other. The cross section of the ventilator housing 3 is also in this its, narrower section 3c significantly larger than that of the hollow shaft 2, and the Durchines of the propeller or propellers 7 and 8 is slightly smaller than the (smaller) edge length of the opening 6 of the aerator housing 3. The propellers 7 and 8 are centrically hollow propellers, and they are preferably mounted crossed to one another and have a different, but in the same direction Slope up. The slope of the second one, which is closer to the opening 6, is here. Propeller 8 less than di of the first propeller 7. The second propeller 8 supports the action of the first propeller 7 and prevents it Entanglements. Normal ship propellers can be used for the purpose described here, as they are in Trade for light motor boats (motor boats for inland waters) are offered.

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An (air) channel 9 is provided along the top of the aerator housing 3 (see also FIG. 2), which is closed at the outermost end of the aerator housing 3 that is immersed in the liquid, but through an opening 11 in which has the channel 9 with the limiting V.'and of the ventilator housing 3 connection kit to the interior of the ventilator housing 3. The channel 9 could also run along the inside of the upper l'ana of the aerator housing 3 and directly Ε-it into the opening 6 c: fr, -: - r .. The channel 9 extends almost over the entire length the Belüftergehäuses 3 and is fixed to "its, rear end :: directly by a connecting piece ^9! r.it the Ausstoieffnung a fan 10 verbuncsn, cer ir Endbreich of outstanding from the liquid to be gassed, extended Endabschniits 5b · 3 on the upper side of the Belüftergehäuses is r.ontiert. the fan 10 vird operated in the sense of a compressor, ie it sucks air (or gas) of mice ε · η, vei ^ seals, vie v. ^r pus explained in more detail below wire, one in the device, for example in the channel 9, standing air column and thus presses the air (or gas) with slight-: excess pressure from the opening 6 of the aerator housing 3 into the medium to be gassed. Above the fan 10 tefinöet-

a protective hood 12 which can be placed on the ventilator housing 3 and which at its contact edges with the ventilator housing 3 sealed against this by a rubber seal can be.

Like the ventilator housing 3, the (air or gas supply) channel 9 including the connector 9 'A ^r orzugsv is hot. ^r also has a rectangular cross-section (see FIG. 2); its cross-sectional area is in a practical sense. about 30 x 40 rr.

below the transmission point of the Kenals 9 and the connector 9 ¹ is located in the V / snd of the Eelüftergehäuses 3 or. in which the channel 9 λ ^τ ογ _; Inside the wall separating the aerator housing 3 an opening 13, which can be opened or closed with the aid of an air adjustment slide 14. The air Ucistellschieber 14 can be a hinged slide which is rotatably positioned by means of a bolt in the housing wall: and UEi this bolt can be actuated, ie rotated, from the outside with the aid of a lever to open and close the opening 13.

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In the above-mentioned practical embodiment, the hollow shaft 2 has an inner diameter of 2 ^lf (inches) or approx. 50 min and has several slots in the enlarged area of the ventilator housing 3, in which the above-mentioned opening 13 is also located of elongated holes 15 of about 8 cm in length and 2 he. Width on. Preferably, four such elongated holes 15 s} ^{r are} mnetrically arranged in the circumference of the hollow shaft 2.

The air adjustment slide 14 is used as below will be explained in more detail, to the air flow of the durcr. the fan 10 introduced air optionally uir. to direct. When the air changeover slide 14 is open, it penetrates the air through the opening 13 into the aerator housing 3 and through the slots or elongated holes 15 into the interior of the hollow shaft 2. The total passage area of the longitudinal holes 15 is larger than the clear pipe cross-cut Hollow shaft 2, opposed to the resistance to the: air flow is to be kept as low as possible or not to increase unnecessarily. Because the steeper the device in the liquid is immersed, the greater this resistance and the more force is required to ur. to overcome this resistance. By the Gesant passage area the elongated holes 15 is larger than

the clear cross-sectional area of the hollow shaft 2 prevents the elongated holes 15 from providing an additional resistance to the air flow; the V.'iderstand, which is opposite to the air flow is due to its largest or major proportion by only the drilling of the hollow shaft 2 itself, vie Eohrleiiungswiderstand \ ιηά frictional resistance acr air.

In a special I.-cc '''Zr: rv.n ~ z: i: Tr. in, \; ie from Fi;:. 2 is to be appointed, in a bottom of the rirc! .TC: C:!: Ige: -: df; also square zolü; tergehüuses 5 u :::. t el bar behind the opening 6 a further opening u:; g in 7crr. c-ines rccr.tecirigcn excerpt "β \ ύτ ^ Ζ5θ '·.: εη, which by a squint (not drrgerlel ::} gec-ifnct cCcr verrchlossc :. verce :: kr.nn. Es): can be cnbs: u ~ turn a simple plate, which before a linkage (: .- icht carresteljt) cur. Dffr.en and Schliefen ces cutout operated by the ... by opening this slide can be operated for the V, ' : ng2 -..- ei £ C of the device (see below) substantial, building-up negative pressure in the aerator housing 3 "and the liohlvcile 2 are still reinforced and drr.it the effectiveness of the device is increased, inder. significantly r-.eYiT forward movement Her cinrebrachten by the fan 10, air obtained vir

I, I t

'Il

III I I

• I III

• · Il III »

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The fan 10 is a radial cooking valve and has its own drive motor. The electric motor 1, which drives the hollow shaft 2, and the drive motor of the fan 10 are preferably supplied with power via separate cables, so they can be operated independently of one another. The hollow shaft 2> ε · ηη as in the /.usfür.rur.gc- iorzi ger.äS Fig. 1 are driven directly by the electric motor 1; Of course, a drive with full or under-icing is also possible if a higher or lower number of outer propellers 7, L is desired.

In the practical embodiment mentioned above, the electric motor 1 is a rotary switch "i". A power consumption of about 3.5 V, "; in Ar.p? ssu: .r t:. The propellers 7, 8 used can also be a certain amount above or below these values. The fan 10 is preferably a low-pressure fan r.with a Lcistungsaufnahrr.e of 370 V.'att and only a low overpressure performance of about 112 mn V.'S and an air flow rate of 650 zr per hour without back pressure. This compared to the; or the fans of the older Ar-relcung etvas increased power of the fan 10 allows the device

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device with a relatively steep angle of attack to keep immersed in the medium (water), thereby achieving more deep aeration (7 to 8 π deep) can. The angle of attack can, as already mentioned above, be changed on the suspension 4, for which purpose this one Adjustment or snap-in segment with several snap-in steps. or has continuous adjustment.

All parts of the device are preferably made of more corrosion resistant. Material.

How the device works:

For use, the device with its rigid substructure 5 is mounted on one or more Schvir.r.ern so that it is on the surface of the liquid to be fumigated and / or umzuv.'äls ends, e.g. the activated sludge tank of a sewage treatment plant, can be attached floating. It immerses the liquid at a certain angle that can be adjusted on the suspension 4 with its end facing away from the electric motor 1, i.e. with the opening and the propellers 7 and δ, at a depth that is not too great. The electric motor 1 and the fans 10 are driven via separate power cables

Due to the rotation of the propellers 7 and 8, a strong, essentially forward, that is, in the continuation direction of the hollow shaft 2 directed flow and through the suction effect occurring in the hollow shaft 2 and ir. area between the opening 6 and the foremost propeller 7 creates a certain negative pressure. In this area, supported by the negative pressure generated, Air sucked in from the atmosphere by the fan 10 is introduced with a slight overpressure. And zver kai * :: this may have happened on two occasions.

When the Kieppschieler is closed, it penetrates. Fan 10 sucked air into the (gas or air supply) channel 9 _/ displaces a vertical column and passes through the opening 11 located behind the opening 6 of the aerator housing 3 in the channel 9 into the interior of the aerator housing 3 and then immediately through the opening 6 in the direction of the propeller 7, £, supported by the negative pressure generated by the latter.

If the hinged slide 14 is operated from the outside with the aid of an If the lever is opened, the air coming from the fan 10 penetrates through the opening 13 at the connection point from fan 10 and duct 9 into the interior immediately

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of the aerator housing 3 and displaces an approximately standing water column. It also penetrates through the in the area of the opening 13 in the hollow shaft 2 provided slots or elongated holes 15 in the interior of the Hollow shaft 2. The hollow shaft 2 is sucked empty by the negative pressure generated by the propellers 7, 8, and those with light; ·! overpressure from the fan 10 introduced air can, supported by the negative pressure, through the hollow shaft that is open at its :, free end 2 as a tightly bundled, far-reaching beam into the l-'ediurr. exit by the propellers 7, c generated scattering is rd!

Besides your: the hollow shaft 2, a certain proportion of the air introduced by the ventilator 10 passes through the duct 9 and through the fan housing 3 at the opening 6 in the opening 6 even when the hinged slide 14 is open. Frozen area. A motor-side sealing of the Eelüftergehäuses 3 against the carbon shaft 2 prevents caS that when the. Flap slide 14 introduced LuIt ₁ instead of through the opening 6 and the hollow shaft 2 in the Kediur. to enter, escapes back into the atmosphere on the path of least resistance.

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ν V V i.

The air brought into the negative pressure or propeller area is caused by the high-speed rotating
Propeller 7 and 8 smashed very finely and overcoming the counter pressure of the water column through the ^; generated flow entrained in the liquid and intimately mixed with the liquid by j strong turbulence,? so that the air entry is essentially extremely fine-bubble (approx. 1 min diameter of the air bubbles) unc
dair.it for fumigation of the liquid f.-u ^ erc ^ centlic · :. | effectively takes place and a high "rate ar, Lccur. ^: before. 0 ~ sj is produced in the liquid.!

The dispersion produced by the propeller 7, 8 rich. "I it in Kor.Tialfall 1 to 5. Deep, unc by zie ce-.:ir";:"-C- j

The turbulence in the air bubbles is extremely intense and extensive. In contrast to the supporting effect of the negative pressures generated in the propeller area, a 'j is sufficient

low force, ie a slight overpressure, in order to bring in the air and possibly the before commissioning of the
Device in the gas or Liutsuführungskänal 9 unc;
to displace the liquid standing in the aerator housing 3,
so that, as already stated, the fan 10 can be a low pressure fan. If the fan 10, like
given above by way of example, with a power consumption.

of 370 V / att an air flow rate of 650 m / hour without counter pressure on v / eist, it is possible to immerse the device relatively steeply in the medium to keep and thereby more deep ventilation (7 up to 8 egg deep). With the new device, a 20-fs.cher Air entry can be achieved with lower power consumption.

The peculiarity of the device, de.? the air can be introduced into the medium either exclusively through the channel 9 into the propeller area of the device or to a greater extent through the hollow shaft 2, allows, if necessary, the intensive disintegration and turbulence of the air introduced by the propeller 7 , 8 or to give preference to the particularly far-reaching, bundled air jet with a greater depth effect Qen.

According to a particular embodiment of the device (see. Fig. 2) is on the underside of the ventilator housing £ 3 an opening in the form of an opening immediately behind the opening 6 a cutout 16 is provided, which rush with Eilfe Linkage can be opened and closed by a plate. When this Flattc exposes the cutout 16, reinforced

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the flow generated by the propellers 7, 8, the then also entrains more air accordingly, so that in this way the negative pressure supporting the air entry can be amplified and so much more forward movement of the air flow is achieved, which also favors the depth effect.

The device according to the invention is particularly suitable ^! for use with large water areas in circular or oval aeration basins and circular or ονεΐ running oxidation ditches of sewage treatment and pond systems, in which a circumferential scattering can erze-rl jj.

In an oxidation ditch of 99 it. Uiriang eir.er Sewage treatment plant, in your previously the Belebtschlar.r.-O'asserger.iEc :: by two brush rolls of 6 kl each; Power consumption was pumped around, during the trial use of a prototype of the device according to the invention on the Air entrainment parts after an operating time of 1/2 Hour an oxygen content of 6 mg Oo / liter was measured, and that, it should be expressly pointed out, without an additional pumping device to move the revitalized door: - water geese; because the device according to the invention.

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on the one hand drives the water or the activated sludge water. ⁿ , isch round and on the other hand covers the oxygen demand of the impurities (aerobically) degrading Kikroorganic: r; en, and this with a ::: lower energy expenditure.

. '' (Without endless loop Strcr.ung) but the eriindungsgemäfe device is also suitable for Flu5bell'ftung, ϊ, ν the "achbelüftung, including the treatment of the thernophile Schu ^ schlcrrr 'he:.. Rrjs sewage treatment plants, and for the Loading

general.on. Of course, if necessary, in a, j living basin, in an oxidation ditch or in a river ". several devices according to the invention are running

The '.virlrweise the device according to the invention above in connection with the "Purification of wastewater for the case of nitrification, i.e. oxidation. Anr.oniuniverbindungen, described by microorganisms. In the case of wastewater treatment, however, in addition to kitriiication. also denitrification, i.e. the anaerobic degradation of the nitrate produced during ITitrification by another Type of microorganisms, of importance, that set in when the largely treated wastewater is then oxygen-

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EAD OHiaiWÄL COPY

is kept free and hydrogen donors in Fora of untreated wastewater are available. ;

j Since the apparatus described herein the electric motor 1 · AEN for driving the propeller 7 and δ and; Fan 10 - for gas or air entry via separate ^; Circuits can be driven and the gas resp. Air entry is not the cause of disturbance generation as in the state of the art _. ; 3 ·, more detailed device oen Verondercri Vc-rteiü, "z'r. '. ~ \ To be wise and alternately used for the ilitrification and the Lsr.itri-; fication. For the 1,' itrifikaticn ·. : iz _ "· .- · η = the electric motor 1 and the fan 10 driven simultaneously and thus at the same time the CtrcT.vnr: over circulation in the liquid or the"; relel-ch-I ':: ~ - V, ^T aterger: When the oxygen intake has been reached, the aerobic process required for the citrification is created. Only the electric motor 1 is driven for the denitrification; the anaerobic condition required for this is established in the liquid or activated liquor / barrel mixture. The drive of the Ventilr-torir 10 can according to the requirements via a Ze-i: -

be controlled by a timer or a pulse generator.

The device according to the invention is based on the drawing in the embodiment with two on the hollow shaft 2 propellers 7 and 8 arranged one behind the other are described. Basically sufficient for the generation of the Flow also arranged directly in front of the opening 6 of the aerator housing 3 on the Eohlvelle 2 Propeller 7. Crossed by the back, first propeller 7 two! en propeller c ir.it the same direction, el er however, the cer. Increased suction power that supports the entry of gas or air and the generation of disturbances increases. Exceptions will be through the second propeller 5 customs clearance connector! or thrown away and thus the risk of blocking of Kotors 1 counteracted.

The device vurce in Vorstehencen example for use in sewage treatment plants for biological "Cleaning described of sewage; their Anv ^r ending is not restricted to this area, you can also conflicting or for ventilation flowing waters and beyond anywhere application.

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OKIQiMAL

find where in liquid media or mixtures of
Liquids with solids should create a flow or circulation or where gaseous media such as air, oxygen, other gases or their mixtures should be introduced into liquid media (or mixtures of liquids with solids) as fine bubbles as possible, in particular also to bring about chemical " Reactions.

Claims (17)

_ * ■? e- w ν ν f- Helga Lind, 7140 Ludwigsburg, Eckenerstraße 12 Device for gassing or aeration and / or circulation of or generation of flows in liquids 1. Device for gassing or ventilation and / or Circulation of or production of currents in Liquids, especially in aeration tanks for the biological purification of wastewater, ir.it at least one shaft that can be driven by at least one drive unit, at the free one in the liquid-immersing end is at least one propeller enordinated by its pitch in the direction of continuation of the wave a flow can be generated and the entered one with simultaneous gassing Gas (for example air) can be distributed in fine bubbles, with one or more gas or air supply lines end in the area of the propeller, 2 - through which gas (e.g. air) can be introduced under pressure as required and without causal connection with the drive of the propeller, according to patent application P 31 44 885.2,
characterized, - That the shaft is a known hollow shaft (2), which in a known V / eise in its other, the drive unit (1) facing: end section at least one gas or. Air access has opening (15), - That this Kohlwelle (I) in an elongated, on the side of the drive unit (1) against the Hollow shaft (2) sealed Eelüiter housing (3) revolves and from its immersed in the liquid, forwardly open end section (3c) protrudes by a hatred, - That on this end of the hollow shaft (2) protruding from the ventilator housing (3) at least one, vo: suggest two, propellers (7, 8) at a short distance to each other (a few cm) and less: Abs ta to the opening of the ventilator housing (3) are mounted 5f = - T »VV V β» V - That along the wall of the aerator housing (3) one extending over almost its entire length Gas or air supply channel (9) is provided, which is on its own, immersed in the liquid End is closed, but immediately behind the opening (6) of the ventilator housing (3) through an opening (11) has connection to the interior of the aerator housing (3), and that on its other End connected to the discharge opening of a gas (for example air) under pressure releasing device (10) is, - and that the channel (9) at its junction with this device (10) in the area of the gas j "or air inlet opening (s) (15) of the hollow shaft (2) an opening (13) to the interior of the ventilator housing (3), which by means of a slide (14) Can be opened or closed at times. 2. Apparatus according to claim 1, characterized in that the drive of the hollow shaft (2) and the drive which emit the gas (e.g. air) under pressure 4 - Device (16) are separated from one another and can be operated independently of one another. 3. Apparatus according to claim 2, characterized in that the gas (e.g. air) under pressure-releasing device a low pressure compressor (fan, Blower) (10) is mounted on the end of the ventilator housing (3) protruding from the liquid is. 4. Apparatus according to claim 3, characterized in that the low-pressure compressor (10) by a the aerator housing (3) attachable protective hood (12) is protected. 5. Device according to one of claims 1 to 4, characterized characterized in that the slide is a hinged slide (14) rotatably mounted about a bolt, the middle a lever can be operated from the outside. 6. Device according to one of claims 1 to 5, characterized characterized in that the total passage area of the Gas or air inlet openings (15) in the hollow shaft (2) is larger than the clear cross-sectional area of the hollow shaft (2). 7. Device according to one of claims 1 to 6, characterized characterized in that the air inlet openings in the hollow shaft (2) 'have the shape of elongated holes (15). 8. Apparatus according to claim 7, characterized in that aci circumference of the hollow shaft (2) four elongated holes (15) are arranged symmetrically. 9. Apparatus according to claim 8, characterized in that each of the elongated holes (15) is about 8 cm long and approx. 2 cm wide iat. 10. Device according to one of claims 6 to 9, characterized in that the hollow shaft (2) has an inner diameter of approximately 2 ^M (inches). 11. Device according to one of claims 1 to 10, characterized in that the ventilator housing O) one has a rectangular or square cross-section. 12. The device according to claim 11, characterized in that BAD ORlGWAL -G- that the low-pressure compressor (10) (blowers, Ventilate on top of the Belüftergehäuses (3) mounted i and the channel (9) extends along the wall of this upper side. ': 13 · Device according to claim 12, characterized in that that the channel (9) also has a rectangular cross section. 14. The device according to claim 13, characterized in that the channel (9) has a cross section of about 30 χ 40 s Has. 15. Device according to one or more of the claims 3 to 14, characterized in that the low-pressure compressor (10) a power consumption of approx. 370 watts and only a low overpressure output of r 112 mm WS with a conveying capacity of approx. 650 m "7. Hour without counter pressure. 16. Device according to one or more of the claims 1 to 15, characterized in that on the underside of the portion immersed in the liquid BAD ORfQSMAL ⁷ _CQpy (3c) of the aerator housing (3) immediately behind the Opening (6) an opening in the form of a cutout (16) is provided, which is opened with the help of a linkage and a slide can optionally open and close. 17. Device according to one of claims 1 to 16, characterized characterized in that the diameter of the propeller or propellers (7, 8) is slightly smaller than the diameter or the (smaller) edge length of the opening (6) of the aerator housing (3).