DE102011122695A1 - Clear water-air lifter with backflush function, comprises suction pipe having suction port, siphon tube, a compressed air line connected with compressor, curved drain pipe with water buffer connected to the siphon tube, and a jacket tube - Google Patents

Abstract

Clear water-air lifter with backflush function, comprises a suction pipe (11) having a suction port (10) in its wall, and a siphon tube (13), where the suction tube and the siphon tube have a common connection are; a compressed air line (17) which is connected with a compressor, having a air inlet opening; a curved drain pipe (14) with water buffer which is connected to the siphon tube, such that a water line is formed from the suction port through the suction pipe in the siphon tube towards a drain pipe; and a jacket tube divided centrally by a separating wall. Clear water-air lifter with backflush function, comprises a suction pipe (11) having a suction port (10) in its wall, and a siphon tube (13), where the suction tube and the siphon tube have a common connection are; a compressed air line (17) which is connected with a compressor, having a air inlet opening, where the air inlet opening leads into the siphon tube; a curved drain pipe (14) with water buffer which is connected to the siphon tube, such that a water line is formed from the suction port through the suction pipe in the siphon tube towards a drain pipe; and a jacket tube divided centrally by a separating wall, which is closed at its one end with a bottom and passes into the drain tube at its other open end, which forms the suction pipe and the siphon tube. The separating wall at its lower edge, forms a connecting sheet at its apex between the siphon tube and suction pipe having a 360[deg] shaped pointed turning of the two perpendicular tubes leading upward, where the connecting bow the distance between the separating wall to the bottom of the jacket tube is approximately half the diameter of the jacket tube. The air inlet opening is located on or in the separating wall on the side of the siphon tube in the immediate vicinity of the vertex of the separating wall. The inlet pipe is closed through the suction port with a separation. The side opening of the drain pipe is reduced to approximately half of its pipe diameter, so that the water buffer is formed. The separating wall is formed as a center wall hollow body, where the volume of the hollow body is at least equal to the volume of the suction tube and the air from the hollow body of water can flow via system leaks at the compressor and/or unwanted side openings. An independent claim is also included for using clear water-air lifter with compressed air jack in a reactor with clear water phase, comprising introducing the compressed air through the pressure tube by the pressure air supply means into the hollow body for backwashing for a first rinsing process, until the water flows out through the air inlet opening and the deposited bacterial sludge-water mixture is displaced into the tube bottom by the U-shaped 360[deg] tube bend, and displacing the fluid through the inlet opening in the inlet pipe and conveying to return into the reactor, carrying out the second rinsing process by supplying compressed air through the air inlet opening so that air bubbles are formed in the siphon tube and the water column in the siphon tube is raised from the clear water phase of the reactor via the suction port and the siphon tube is lifted to guide the clear water from the lower edge of the outlet pipe, then the air supply is turned off, so that the water column flows downwards in the opposite direction in the siphon tube, supplying the compressed air at the point of the greatest hydraulic fluid in the siphon tube, so that the compressed air blowing through the connecting bow in the inlet pipe is diverted, where the suction pipe opens via the suction port into the reactor, a vacuum is generated temporarily in the siphon tube, and the water is conveyed into part through the inlet pipe and conveyed into the reactor through the suction port. The clear water flows into the jacket tube from the clarified water phase of the reactor after switching off the compressed air in the opposite direction and the clear water is filled such that the water column is lifted up in the siphon tube to the bottom of the discharge pipe.

Description

The present invention relates to a clear water compressed air lift for biological sewage treatment plants with backwash function

In almost all biological sewage treatment plants, which do not work with electric underwater pumps, but with a compressed air generator, also called compressor or compressor, work, compressed air lifters are necessary to promote the domestic wastewater from one basin to another, or the resulting clear water in the flow of To pump sewage treatment plant. Air lifters consist of a tube open on both sides with a compressed air connection on the side. The air jacks are mounted vertically in the treatment plants so that the compressed air connection is as far below the water level as possible, that the suction opening of the pipe can aspirate water to the desired height and the outlet of the pipe is placed where the pumped water is to be discharged. If there is enough water in the wastewater treatment plant, so that the siphon tube above the compressed air connection is well filled with water, then, with the compressed air generator switched on, the compressed air flows through the air inlet opening into the siphon tube and conveys the water vertically upwards. The resulting air bubbles tear the surrounding water in the pipe upwards and thus promote the inflowing water through the outlet opening of the siphon tube.

This pumping process lasts until the water level in the wastewater treatment tank is lowered so that the shortened path in the siphon tube, the buoyancy forces of the high-flowing air bubbles no longer entrain water, or the compressed air generator is turned off. In biological wastewater treatment plants, especially in SBR wastewater treatment plants, the inflowing wastewater is stored in a pre-treatment tank in order to be pumped into a SBR reactor after a cycle of several hours.

In the reactor basin, also referred to as reactor, the wastewater is aerated by plate or pipe aerator feinperlig, Through this ventilation, the free-floating bacteria located there can breathe and purify the wastewater through their metabolic processes. After this cleaning phase, the ventilation is switched off, so that the bacteria can settle by sinking on the ground. After this settling phase, a clear water zone is formed above the bacterial layer, which is then pumped by the clear water elevator, in the same function as described, into the outlet of the sewage treatment plant.

At the same time, excess bacteria are pumped into the primary clarifier by the surplus sludge lifter operated in parallel with the clear water jack, to a lesser extent because of the smaller sized siphon tube.

After this clear water pumping time, the sewage treatment cycle begins again with the feed pumping time, in which the feed lifter pumps the pre-treatment water into the reactor in preprogrammed time. The compressed air for the feed lifter, for the plate ventilator and for the clear water or excess sludge lifter is switched via individual electromagnetically actuated valves. These valves are supplied with compressed air via a compressed air compressor.

For these reasons, the prior art airlifts are designed so that its suction port is below the water surface and the pump down operation is achieved when no water can flow over the lower edge of the suction port (see 1 ). Due to this need to pump out the upper clear water area and not the underlying area of settled bacteria, it is necessary to guide the intake pipe following the intake vertically downwards and over a U-shaped 360 degree arc with the following vertically upwards to connect the following lever tube. So that buoyancy forces of the compressed air bubbles flowing into the siphon pipe are greatest, the air inlet opening attached laterally to the siphon pipe must be as deep as possible, but above the pipe bend.

The so designed by almost all manufacturers clear water has the disadvantage that the pre-treatment runs when filling the reactor by means of feed lifter in the intake of the clear water lifter and can settle there floating particles.

The pollution of the clear water is done in systems according to the prior art far from intensive in the subsequent aeration process by the ascending when switching the plate, tube, Membranbelüfters air bubbles increase first in the water volume in the reactor and secondly swirl the settled activated sludge bacteria in the reactor water , So that they pass through the increase in volume also through the intake into the intake pipe of the clear water jack and also settle there. The ventilation period in the reactor of an SBR treatment plant often takes several hours. The plate or Rohrmembranbelüfter is therefore switched on and off during this period in the preselected cycle, so that at least every time ventilation begins again and again activated sludge bacteria are pressed because of the volume increase described in the clear water. As the activated sludge bacteria heavier are as water, they sink in the intake pipe down and fill the pipe bends, which connect the intake pipe and the lever tube together. At the beginning of the clear water pumping time, the clear water lift conveys these deposits into the wastewater treatment plant effluent.

This is easy to see in practice, because the first pump surges have the color of the activated sludge bacteria. In the further pumping the clear water is rinsed by sucked clear water so that all pipe deposits are carried away. And only clear water from the clear water zone of the reactor is conveyed into the drain of the sewage treatment plant.

A disadvantage is thus in plants according to the prior art that activated sludge bacteria in this way constantly get out of the sewage treatment plant in the drain. This so-called activated sludge stripping has the consequence that in the reactor, the activated sludge volume is constantly reduced and thus also the wastewater treatment performance. It is particularly disadvantageous if there is a seepage behind the sewage treatment plant run, which is slowly silted up and rendered useless by the sludge removal. The same applies if there is a receiving water downstream of the wastewater treatment plant, which creates an imbalance due to the sludge load and the associated oxygen reduction in the water of the receiving water. Another disadvantage is that there are no compressed air lifter, in which the clogged suction port of the feeder jack, by a suitable backwashing eliminates this obstruction.

To solve these disadvantages, a clear water lifter should be designed so that no water-activated sludge mixture can penetrate into the intake, or this sedimented activated sludge is flushed back from the clear water jack before the clear water pumping time in the reactor and thereby the siltation of infiltrations, as well as the contamination of bodies of water is avoided.

In practice and from published patent applications, some solution variants are realized or known, which are intended to counteract the disadvantages described.

According to DE 20 2005 019 918 U1 For example, check valves are attached to the intake openings of the clear water lift pipe in order to prevent the activated sludge bacteria from penetrating there. Many years of experience have shown that the hair floating in the sewage or similar parts wrap around the movable flaps or valves in such a way that the desired closure forces no longer have an effect after some time or have to be constantly cleaned by time-consuming maintenance work.

In DE 10 2008 038 116 A1 and DE 10 2007 049 517 A1 It is proposed to filter the particulate matter and the activated sludge bacteria with filter devices so that they are collected in the filters and can not leave the treatment plant. For this purpose, signaling devices are necessary, which indicate the level of the filter, and signal the necessary filter cleaning.

The disadvantage here is that the activated sludge bacteria are not returned to the reactor, but lost for the cleaning process. In addition, the filtration and maintenance of the filters are very expensive.

Further solutions are, for example, in DE 10 2007 058 177 A1 . DE 10 2008 020 938 A1 and in EP 1 582 263 B1 disclosed. According to these proposals, it is attempted to prevent the penetration of activated sludge during the ventilation in the reactor by Strömungsableitvorrichtungen at the intake of the clear water jack. Through certain pipe arrangements is trying to keep away during the aeration water-activated sludge mixture of the direct suction port of the suction pipe from the clear water jack, or to calm down in a kind of buffer tube. However, these proposals do not take into account that an increase in volume occurs at the beginning of each ventilation. The increase in volume causes an overpressure in relation to the open-sided clear water lift tube on both sides and tries to compensate for this. Thus, in any event, at each start of aeration, the water-activated sludge mixture flows into the intake port of the clear water elevator to settle to the bottom of the U-shaped 360 degree arc. Thus reduce the in DE 10 2007 058 177 A1 . DE 10 2008 020 938 A1 and in EP 1 582 263 B1 measures described only the activated sludge output.

DE 100 57 378 B4 discloses an electric underwater pump as a clear water pump, which should pump the clear water from the clear water area in the flow of the sewage treatment plant.

Activated sludge deposits from the previous aeration cycle occurring in the pump are eliminated by one or more pump strokes according to this technical solution. So it is briefly pumped water into the outlet side riser so that it flows through the pump in free fall and entrains the lying there activated sludge and into the reactor flow. However, this good operation of a hydraulic flushing is not possible with the same application in the compressed air driven clear water heater because of the closed down 360-degree U-bend.

In tests it was tried to carry out this hydraulic backwashing at the clear water lifter practically. A brief burst of compressed air while the water column was raised in the siphon, that necessary inflowing water was low because the increase in volume in the riser for the most part of the incoming air bubbles, the falling falling water column, must first separate from the rising air bubbles and therefore not the required speed to take the activated sludge in the U-shaped tube part so that it ascends to the suction port to get there into the reactor water. The process was repeated with a buffer tank attached above the outlet of the siphon tube. When you press the clear water, so this is first filled with water before the clear water can drain laterally from this. To generate a rinse, the clear water lifter is briefly turned on until the buffer tank is filled and not overflowing. When the clear water jack is switched off, the water from the buffer tank flows back into the jack and pushes the buffered water back through the suction port into the reactor. The activated sludge fraction flushed out in this way is small and corresponds only to the amount of clarified-water-sludge mixture of the volume of the buffer container. The buffer tank can and must not be too large, because its water back pressure greatly reduces the head and the capacity of the clear water lifter. In addition, the flow rate of the recirculating water is not sufficient to entrain the activated sludge deposits at the bottom of the U-shaped pipe bend.

The above-described hydraulic backwashing of the activated sludge bacteria is therefore unsatisfactory.

The DE 10 2010 049 709.6 proposes a clear water air lift with backwash function consisting of an intake manifold with a suction port in its wall and a siphon tube (wherein the intake manifold and the siphon have a common connection space), a compressed air line with an air inlet opening (wherein the air inlet opening into the lift pipe) and a curved drain pipe with water buffer (which is connected to the lifting tube, so that a Wasserleitweg is formed by the suction through the suction pipe in the siphon tube to the drain pipe), wherein a centrally divided by a partition wall cladding tube (which at one end with a bottom closed and at its other, open end merges into the drain pipe) the intake manifold and the siphon tube forms, the partition at its lower edge at its apex between the siphon tube and intake manifold a connecting arc with a 360 ° -shaped tip turn of the two vertically upwardly leading tube e forms (wherein in the connecting arc, the distance of the partition to the bottom of the cladding tube is approximately half the diameter of the cladding tube), the air inlet opening on or in the partition wall on the side of the siphon pipe in the immediate vicinity of the apex of the partition, the suction pipe above the suction port is sealed with a foreclosure and the lateral opening of the drain pipe is reduced by approximately half its tube diameter, so that the water buffer is formed in order to reduce the hydraulic backwashing of activated sludge bacteria, wherein in the practical application of the clear water compressed air lifter according to DE 10 2010 049 709.6 the standards applicable in Germany for the clarified water of sewage treatment plants with regard to the proportion of filterable constituents (such as in particular activated sludge bacteria) are met, whereas the stricter standards applicable in France with regard to this proportion are clearly exceeded.

The invention is therefore an object of the invention to provide a clear water air lift for biological treatment plants and methods for its operation, which compared to the clear water air lift and the method according to DE 10 2010 049 709.6 significantly reduces the proportion of filterable components of the clear water (in particular activated sludge bacteria), so that the standards applicable in France with regard to this proportion can be met.

This object is achieved by a clear water for biological wastewater treatment plants according to the first claim and a method for its operation according to the ninth claim. Advantageous embodiments of the invention are specified in the subordinate claims.

The essence of the invention is that the clear water compressed air lifter is designed so that it works in a combination of hydraulic and pneumatic backwashing in the manner that the activated sludge flushed into the reactor and for an enlarged in volume compressed air line and a small buffer tank is used at the outlet of the siphon to run two flushing functions in combination, one after the other or individually.

For this purpose, the clear water air lift with backwash function includes an intake manifold with a suction port in the wall and a siphon, wherein the suction pipe and the siphon have a common connection space, and a compressed air line, which opens into a partition, which is designed as a hollow body profile and at the lower end has an air inlet opening, wherein the air inlet opening into the siphon tube, and a curved drain pipe with water buffer, which with the siphon pipe is connected, so that a Wasserleitweg is formed by the suction port through the intake pipe in the siphon tube to the drain pipe.

A centrally divided by a trained as a hollow body partition wall cladding, which is closed at one end to a bottom and merges at its other open end in the drain pipe, according to the invention forms the intake manifold and the siphon, each having a semicircular cross-section, wherein the cross-sectional area of the drain pipe is almost twice as large as the cross-sectional area of the siphon pipe.

The designed as a hollow body partition wall has at the upper end a connection for the compressed air line, which is connectable to a compressor, and at the lower end on one side an air inlet opening, system leaks at the compressor and / or intentional side openings escape air and water get into the partition formed as a hollow body can.

The partition forms according to the invention at the same time by their 360 ° -shaped vertex between the intake manifold and the siphon pipe a connecting arc, with their distance from the bottom of the cladding tube is approximately half the diameter of the cladding tube. In this case, the hollow body volume of the center wall corresponds at least to the volume of the intake pipe.

It is essential that the air inlet opening is located on or in the middle wall and is positioned on the side of the siphon pipe in the immediate vicinity of the apex of the partition, wherein the intake pipe above the suction port with a partition, for example. From foam, is closed and through this foreclosure no air and water can get there.

The lateral opening of the drain pipe is reduced by approximately half of its pipe diameter, so that a small water buffer is formed.

When used as intended, the clear water lift-air lift is briefly turned on until the compressed air flowing through the compressed air line has displaced the water from the hollow body of the middle wall, this water (referred to as the first rinse function) the activated sludge-bacteria-water mixture from the U-shaped 360 ° - Pipe bend has displaced so that this flows from the suction port of the intake pipe into the reactor and then uses the second rinsing function, which then begins when the water from the hollow body of the middle wall is completely displaced and flows from the air inlet opening, the compressed air into the siphon pipe, the water up there promotes until the buffer tank is filled with water and its drain pipe does not overflow. Thereafter, the clear water jack is switched off immediately. Shortly after the shutdown, the buffered water flows back into the siphon tube through the U-shaped pipe bend in the direction of the suction port.

Exactly at the beginning of this return flow, the compressed air is turned on again, so that the water flow diverts the emerging compressed air at the air inlet opening in the opposite direction through the U-shaped pipe bend in the ascending intake pipe, whereby the air bubbles rising in the intake pipe, the activated sludge-water mixture through the intake opening in let flow the reactor, wherein at the same time in the lifting tube, a negative pressure is created, which promotes the water located there to a minimum.

After switching off the briefly supplied compressed air flows mainly clear water into the intake and fills the clear water.

After repeated operation of the process described with the first and second rinsing function, the tube of clear water is completely cleaned of activated sludge bacteria during the clear water phase and the actual Klarwasserabpumpzeit can be introduced without downforce of activated sludge bacteria.

It is important that the redirected air flow can flow quickly and in a very short ways in the ascending intake manifold, because by this momentum in the lift tube quickly creates a negative pressure, the water located there sucks to a minimum and the back flowing water of the buffer tank only the Deflection process of the air flow initiates, so that the buffer volume of the buffer tank must be small.

It is also important that the air inlet opening for the inflowing compressed air at the location of the hollow body of the middle wall is mounted in the clear water, where the deepest vertex between the intake pipe and the lifting tube, since there is also the largest flow rate of the flowing water.

To increase the lift and the Rückspüleffektivität the inventive air pressure lifter is constructed as follows:
The suction and the lifting tube are not separate tubes with a bottom mounted U-shaped pipe connection, but these are inventively formed by a middle wall hollow body by a centrally divided cladding tube by the suction and the lifting tube two seen in cross-section at the lower end hydraulically connectable tube halves represent. The cross section of the intake pipe and the siphon tube is, for example, semicircular.

In the context of the invention is also that the cladding tube in its cross section a different geometric shape than the circular shape and the suction and the siphon have a different geometric shape than the semicircular shape, in which the cladding in its cross-section angular, for example, four or is triangular executed. The same applies to the geometric shape of the middle wall hollow body.

The formation of the semicircular suction in the cross section and the semi-circular in cross-section siphon tube is, for example. Realized by a one-sided closed by a bottom, circular in cross-section plastic tube a slightly oversized over the inner tube diameter made middle wall hollow body is pushed so far into a plastic tube , until between the end of the middle wall and the tube sheet, a distance arises, which corresponds to half the pipe diameter.

On the inserted middle wall hollow body, a compressed air line is attached at the top and has at the lower end of the middle wall hollow body, on a wall side, an air inlet opening. In this way, two seen in cross section semicircular, at the lower end hydraulically connected tube halves are formed. On the side on which the air inlet opening of the compressed air line is located on the middle wall hollow body, the semicircular siphon tube is formed and on the opposite side, the semicircular suction pipe is formed at the desired height due to a suction opening in the cladding tube.

Above the suction opening, the semicircular tube is advantageously sealed off with a semicircular foam pad, so that the air bubbles which rise there for a short time during the backwashing effect can leave the semicircular tube with the activated sludge-water mixture.

Now, if an at least right-angled pipe bend is placed on top of the cladding tube, the water pumped up through the siphon pipe during normal operation can flow off above this pipe angle.

It is important that this pipe bend has almost twice the diameter of the semicircular siphon tube, ie the diameter of the cladding tube, so that the air of the pumped-up air-water mixture at the top of the pipe bend can escape easily and so no back pressure on the air-water mixture Pillar generated in the siphon tube.

Essential to the invention in this clear water is that the air inlet opening of the incoming compressed air via the compressed air line still on the side of the semi-circular siphon tube, but directly to the 360 degree-shaped pointed turn of the two vertically upwardly leading semicircular tubes (apex between lift and intake manifold) ,

In the context of the invention is also that the previously described clear water is used as a feed elevator, in which the backwashing effect of the invention for a short time by the effluent at the suction water and the compressed air bubbles that eliminate clogging occurring in a feed lifter.

The advantage of this technical solution according to the invention (clear water jack and feed lifter with center wall hollow body) lies in the fact that the water, which is located in the middle wall hollow body, in a first flushing function, the bacterial activated sludge-water mixture displaced by the suction port of the intake pipe and in a second flushing function the water buffer needs only be so large that its returning water flow in the lifting tube deflects the short-term compressed air flow so that this, as described above, is diverted into the intake pipe in a very short ways and immediately in momentum through these rising air bubbles in the semicircular siphon tube through the negative pressure generated there is for the most part carried away with water there. In this case, the first rinsing function described can also be realized several times in succession without the second rinsing function, or, as described, also run one behind the other.

Another advantage over the known clear water boilers lies in the simple, effective design and the resulting low installation effort, resulting in a cheap and powerful clear water with backwash.

The invention will be explained in more detail below with reference to the embodiment and the figure. Showing:

1 FIG. 2: a schematic representation of a compressed air-operated SBR system according to the prior art, FIG.

2 : a schematic detail of an embodiment of the clear water compressed air lift according to the invention with backwashing function,

3 FIG. 3: a cross-section of a first embodiment of the clear water compressed air lifter according to the invention with backwashing function and middle wall hollow body, FIG.

4 a cross section of a second embodiment of the clear water compressed air lifter according to the invention with backwash function and middle wall hollow body and

5 : A cross-section of a third embodiment of the clear water compressed air lifter according to the invention with backwash function and middle wall hollow body.

In 1 1 is a schematic representation of a prior art compressed air operated SBR system in which electromagnetic air valves (FIG. 1 ) from the compressor ( 2 ) switched compressed air. These compressed air valves ( 1 ) are controlled by the controller ( 3 ) electrically controlled. A valve ( 1 ) switches the air to the feed elevator ( 4 ), which in the pre-treatment water ( 5 ) is placed. Another valve ( 1 ) switches the air to the plate fan ( 6 ). A third valve ( 1 ) switches the common air in the reactor ( 7 ) placed clear water lifter ( 8th ) and for the excess sludge 9 ).

All three compressed air lifts ( 4 . 8th and 9 ) convey the water through a suction port ( 10 ) in the intake pipe ( 11 ) over a U-shaped 360 ° arc ( 12 ) in the siphon ( 13 ) and a pipe angle ( 14 ) in another basin, or in the treatment plant drain.

A disadvantage of this technical solution is that when the clear water 8th ) the clear water from the reactor ( 7 ) to the minimum water level ( 15 ) and then the feeder lifter ( 4 ) the pre-treatment water containing particles and suspended matter ( 5 ) in the reactor ( 7 ) until the upper maximum water level ( 16 ) is reached, even this heavily contaminated pre-treatment water naturally in the intake ( 10 ) of the clear water lifter ( 8th ) and thereby in the subsequent ventilation phase from the plate ventilator ( 6 ) ascending air bubbles the volume in the reactor ( 7 ), so that the fluidized activated sludge bacteria located in the reactor water by this volume compensation in the intake ( 10 ) of the clear water lifter ( 8th ), to there in the intake pipe ( 11 ) and in the U-shaped 360 ° arc ( 12 ) to sediment.

As a negative consequence, these deposits are promoted in the following Klarwasserabpumpphase with the first pump surges in the flow of the sewage treatment plant. In order to prevent this discharge of activated sludge particles and other deposited particles, these parts would have to be introduced into the reactor water of the reactor as follows ( 7 ) are backwashed:
It is briefly compressed air via the valve ( 1 ) and through the hose line ( 17 ) down into the siphon tube ( 13 ) of the clear water lifter ( 8th ) in the air inlet opening ( 18 ), so that the surface of the water column until shortly before the outlet of the pipe bend ( 14 ) is raised. After switching off the compressed air, the water column falls down and generated at the air inlet ( 18 ) an opposite water flow, so that when switching on the compressed air at this moment, the largest flow of water, the introduced air bubbles are entrained so that this deflected into the intake pipe ( 11 ), can rise there to pass through the intake ( 10 ) in the reactor ( 7 ) to flow into the surrounding reactor water.

The rising compressed air bubbles in the intake pipe ( 11 ) briefly generate a negative pressure in the siphon ( 13 ) and thus promote the largest part of the water volume in the siphon ( 13 ) through the U-shaped 360 ° pipe bend ( 12 ) in the intake pipe ( 11 ) to the intake opening ( 10 ) in the reactor ( 7 ). After this brief rinsing process during the clear water phase, the compressed air is switched off and the clear water ( 8th ) fills with clear water again.

The design of this air pressure lifter according to 1 , which is operated as before standing, is due to its complex operation only conditionally for a hydraulic-pneumatic backwashing.

The in 2 illustrated clear water compressed air lift with backwash function includes a center through a middle wall ( 23 ) split tube, as a cladding tube ( 19 ) and is closed at one end and at its other, open end in a curved drain pipe ( 14 ), which is, for example, 90 degrees angled, wherein the cross-sectional area of the drain pipe ( 14 ) is almost twice as large as the cross-sectional area of the siphon tube ( 13 ).

This ratio of the cross-sectional areas causes the high-pumped clear-water-air mixture to be easily separated at the said transition in such a way that the air of the compressed-air bubbles flows over the upper region of the drainage pipe (FIG. 14 ) and at the bottom of the drainpipe ( 14 ) drains the clear water, so that a back pressure against the in the siphon ( 13 ) located clear water is avoided.

The middle wall ( 23 ) is in this case as a pressure-tight hollow body ( 23a ) - also referred to as middle wall hollow body - designed and has the top of a compressed air connection ( 25 ) for the compressed air line ( 17 ), which is connectable to a compressor, and at the bottom on one side of the air inlet opening ( 18 ).

The cladding tube ( 19 ) has at its one end (the lower end) a bottom ( 191 ) on which the cladding tube ( 19 ) tightly closes.

The middle wall hollow body ( 23a ) has a distance to the bottom of the cladding tube ( 19 ), which is approximately half the diameter of the cladding tube ( 19 ), so that a hydraulic connecting bow ( 12 ) with a 360 ° vertex between the semicircular intake pipe ( 11 ), which has a suction opening ( 10 ) having.

An air inlet ( 18 ), via which pressurized water and also compressed air can be flowed in, lies in the middle wall hollow body ( 23a ) on the side of the semicircular siphon ( 13 ) in the immediate vicinity of the 360 ° vertex, at the lower edge of the middle wall cabbage body ( 23a ).

The inflowing compressed air at the upper end of the middle wall hollow body ( 23a ) attached compressed air line ( 17 ) leaves in a first rinse function from the air inlet opening ( 18 ) Pressure water and when the water volume of the middle wall hollow body ( 23a ) empties, exits the air inlet ( 18 ) for a second rinsing function, there the compressed air.

Above the intake opening ( 10 ) is the semicircular intake pipe ( 11 ) with a semicircular closure in the form of a foam partition ( 22 ), which the intake pipe ( 11 ) between middle wall ( 23 ) and this section of the cladding tube ( 19 ) closes so that the water there briefly emerging during the backwash effect and rising bubbles with the activated sludge-water mixture, the intake pipe ( 11 ) being able to leave.

The drainpipe ( 14 ) is on top of the cladding tube ( 19 ) fitted form-fitting, wherein the lateral outlet of the drain pipe ( 14 ) approximately half the pipe diameter of the siphon tube ( 13 ) and is located at the pipe top edge, so that the necessary for the backwashing water buffer ( 24 ).

During normal operation of the clear water compressed air lifter according to the invention, the backwashing for the first flushing function, as long as compressed air via the compressed air hose ( 17 ), which with the compressor ( 2 ) is connected through the compressed air connection ( 25 ) in the middle wall hollow body ( 23a ) until the water contained therein through the air inlet opening ( 18 ) and the bacteria-slime-water mixture through the U-shaped 360 ° -Rohrbogen and through the suction port ( 10 ) in the intake pipe ( 11 ) has displaced fluently and so back into the reactor ( 7 ). The second rinse function begins when in the middle wall hollow body ( 23a ) there is no more rinse water and from the air inlet opening ( 18 ) Compressed air into the semicircular lifting tube ( 13 ) flows until the water column is raised there and these the water buffer ( 24 ).

When the compressed air is switched off, the water column and the water of the water buffer ( 24 ) in the lift tube ( 13 ) downward. At the moment of this hydraulic return flow, compressed air is again supplied via the air inlet ( 18 ), so that the water flow and the compressed air bubbles, which from the air inlet opening ( 18 ) flow out to the edge of the middle wall hollow body ( 23a ) in the semicircular intake pipe ( 11 ) and the rising there bubbles, which through the suction port ( 10 ), a negative pressure in the semicircular lifting tube ( 13 ) produce. In this case, the largest part of the activated sludge-water mixture located there is also through the intake ( 10 ) are returned to the clear water present in the clear water phase.

After this brief backwashing process, the compressed air is switched off and the cladding tube ( 19 ) fills up via the suction opening ( 10 ) again with clear water from the reactor ( 7 ). Likewise, the middle wall hollow body fills ( 23a ) through the air inlet opening ( 18 ) with water.

The air escapes from the middle wall hollow body ( 23a ) passes through system leaks at the compressor ( 2 ) and / or wanted side openings (not shown in the figures) in this into it.

After several rinses, the cladding tube ( 19 ) of deposits from the previously performed filling and the ventilation operations cleaned. If the described backwash process is a feed lifter ( 4 ), which heavily polluted water from the primary treatment ( 5 ) in the reactor ( 7 ) is pumped, this is the backwashing from the intake ( 10 ) short-term outflowing water and by the outflowing compressed air bubbles possible mechanical blockages at the intake ( 10 ) remove.

The in the 3 illustrated embodiment of the clear water compressed air lift shows in cross-section a possible geometric configuration of the enlarged in volume compressed air line ( 17 ) in the form of the middle wall hollow body ( 23a ), wherein the sectional plane at the level of the air inlet opening ( 18 ) - please refer 2 - runs.

The middle wall ( 23 ) is in this embodiment as a rectangular, pressure-tight hollow body with the air inlet opening ( 18 ) and forms the middle wall hollow body ( 23a ), wherein this middle wall the cladding tube ( 19 ) in the semicircular intake pipe ( 11 ) and in the semicircular siphon ( 13 ) Splits.

The middle wall hollow body ( 23a ) serves as a water reservoir for the first rinse and is used as an extended compressed air line, the compressed air line ( 17 ) used for the second flushing process.

In the 4 illustrated embodiment of the clear water compressed air lift shows in cross-section another possible geometric design of the enlarged in volume compressed air line ( 17 ) in the form of the middle wall hollow body ( 23a ), wherein the sectional plane at the level of the air inlet opening ( 18 ) - please refer 2 - runs.

The middle wall ( 23 ) consists here of a flat material and a tight-fitting midwall hollow body ( 23a ), which is designed as a tube. The flat material and the tube act together as a partition ( 23 ) in the cladding tube ( 19 ) between the intake pipe ( 11 ) and the siphon ( 13 ). Here is the tube of the middle wall hollow body ( 23a ), which is used as a water reservoir and as a compressed air line for the rinsing operations and an air inlet opening ( 18 ) owns.

In the 5 illustrated embodiment of the clear water compressed air lift shows in cross-section another possible geometric design of the enlarged in volume compressed air line ( 17 ) in the form of the middle wall hollow body ( 23a ), wherein the sectional plane at the level of the air inlet opening ( 18 ) - please refer 2 - runs.

This middle wall hollow body ( 23a ) is triangular and also serves as a partition ( 23 ).

All features described in the description, the exemplary embodiments and the following claims may be essential to the invention both individually and in any combination with one another.

LIST OF REFERENCE NUMBERS

1

Valve (electromagnetic one-way valve)

2

Compressor (compressed air generator)

3

Control (electric / electronic control)

4

Feed lifter (compressed air generator)

5

Primary treatment (pre-treatment tank)

6

Disc diffusers

7

reactor

8th

Clear water lifter (compressed air lift)

9

Excess sludge lift (compressed air lift)

10

suction

11

Intake manifold (semicircular intake manifold)

12

U-shaped, 360 ° elbow / hydraulic connecting bow

13

siphon tube

14

drain pipe

15

lower minimum water level

16

upper maximum water level

17

Compressed air line

18

Air inlet opening

19

cladding tube

191

ground

20

pipe support

21

bacteria layer

22

foam foreclosure

23

center wall

23a

Center wall hollow body

24

water buffer

191

Hüllrohrboden

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 202005019918 U1 [0014]
• DE 102008038116 A1 [0015]
• DE 102007049517 A1 [0015]
• DE 102007058177 A1 [0017, 0017]
• DE 102008020938 A1 [0017, 0017]
• EP 1582263 B1 [0017]
• EP 1582263 [0017]
• DE 10057378 B4 [0018]
• DE 102010049709 [0022, 0022, 0023]

Claims (11)

Clear water compressed air lift with backwash function comprising • an intake manifold ( 11 ) with a suction opening ( 10 ) in its wall and a siphon ( 13 ), wherein the intake pipe ( 11 ) and the siphon ( 13 ) have a common connection space, • a compressed air line ( 17 ), which with a compressor ( 2 ) is connectable, with an air inlet opening ( 18 ), wherein the air inlet opening ( 18 ) in the siphon ( 13 ), and • a curved drain pipe ( 14 ) with water buffer ( 24 ), which with the siphon ( 13 ), so that a Wasserleitweg from the suction port ( 10 ) through the intake pipe ( 11 ) in the siphon ( 13 ) to the outflow ( 14 ), wherein • a centrally through a partition ( 23 ) split cladding tube ( 19 ), which is closed at its one end with a bottom and at its other, open end in the drain pipe ( 14 ), the intake pipe ( 11 ) and the siphon ( 13 ), • the partition wall ( 23 ) at its lower edge at its apex between siphon tube ( 13 ) and intake pipe ( 11 ) a connection sheet ( 12 ) forms with a 360 ° -shaped reversal of the two vertically upwardly leading tubes, wherein the connecting arc ( 12 ) the distance of the partition ( 23 ) to the bottom of the cladding tube ( 19 ) approximately half the diameter of the cladding tube ( 19 ), • the air inlet opening ( 18 ) on or in the partition wall ( 23 ) on the side of the siphon ( 13 ) in the immediate vicinity of the apex of the partition ( 23 ), • the intake pipe ( 11 ) above the suction opening ( 10 ) with a foreclosure ( 22 ) is closed and • the lateral opening of the drainpipe ( 14 ) is reduced by approximately half of its pipe diameter, so that the water buffer ( 24 ), characterized in that the partition wall ( 23 ) as middle wall hollow body ( 23a ), wherein the volume of the middle wall hollow body ( 23a ) at least the volume of the intake pipe ( 11 ) and about system leaks. at the compressor ( 2 ) and / or intentional side openings air from the middle wall hollow body ( 23a ) and water is in the einströmbar. Clear water compressed air lift with backwashing function according to claim 1, characterized in that the middle wall hollow body ( 23a ) is pressure tight. Clear water compressed air lift with backwashing function according to claim 1, characterized in that the middle wall hollow body ( 23a ) a part of the compressed air line ( 17 ), which at its free end increases in diameter and in volume and in its length in the direction of the cladding tube bottom ( 191 ), so that the connecting sheet ( 12 ) is generated. Clear water compressed air lift with backwashing function according to claim 1, characterized in that the middle wall hollow body ( 23a ) a part of the middle wall ( 23 ). Clear water compressed air lift with backwash function according to claim 1, characterized in that the foreclosure ( 22 ) consists of foam. Clear water compressed air lift with backwash function according to claim 1, characterized in that the compressed air hose ( 17 ) at the top of the middle wall hollow body ( 23a ) at the compressed air connection ( 25 ) is fixed and there in the middle wall hollow body ( 23a ). Clear water compressed air lift with backwash function according to claim 1, characterized in that the connection bend ( 12 ) relative to the diameter of the cladding tube ( 19 ) is very short and the position of the intake ( 10 ) in the wall of the intake pipe ( 11 ) can be specified. Clear water compressed air lift with backwash function according to claim 1, characterized in that the drainpipe ( 14 ) opposite the cladding tube ( 19 ) is bent by 90 ° and the cross-sectional area of the drain pipe ( 14 ) is approximately twice as large as the cross-sectional area of the siphon tube ( 13 ). Method using a clear water compressed air lift with backwash function according to one or more of the preceding claims 1 to 8 in a reactor ( 7 ) with clear water phase during • for backwashing for a first flushing function as long as compressed air is supplied via the pressure hose ( 17 ) through the compressed air connection ( 25 ) in the middle wall hollow body ( 23a ) is injected until the water therein through the air inlet opening ( 18 ) and the deposited bacterial activated sludge-water mixture in the pipe bend through the U-shaped 360 ° elbow ( 12 ) and through the suction opening ( 10 ) in the intake pipe ( 11 ) has displaced fluently and so back into the reactor ( 7 ), a second rinsing function begins when in the middle wall hollow body ( 23a ) is no more rinse water and through the air inlet opening ( 18 ) only compressed air is supplied, so that upflowing compressed air bubbles in the siphon ( 13 ) and the water column in the siphon ( 13 ) by from the clear water phase of the reactor ( 7 ) via the suction opening ( 10 ) and the siphon ( 13 ) inflowing clear water to the lower edge of the drain pipe ( 14 ) is lifted, then the compressed air supply is switched off, so that the water column in the opposite direction in the siphon ( 13 ) flows downwards, • at the time of the largest hydraulic flow in the siphon tube ( 13 ) at the air inlet ( 18 ) the compressed air is supplied again, so that the Compressed air bubbles through the pipe bend ( 12 ) in the intake pipe ( 11 ), ascending the intake pipe there ( 11 ) via the suction opening ( 10 ) in the reactor ( 7 ) and thereby briefly in the siphon ( 13 ) generates a negative pressure, which the water located there partly through the intake pipe ( 11 ) and through the suction opening ( 10 ) in the reactor ( 7 ) and, after switching off the compressed air in the opposite direction, clear water from the clear water phase of the reactor ( 7 ) in the cladding tube ( 19 ) flows and this fills, so that the water column in the siphon ( 13 ) back to the lower edge of the drain pipe ( 14 ) is raised. A method according to claim 9, characterized in that the clear water compressed air lift with backwashing function during the process vertically in the reactor ( 7 ) is positioned. Use of a clear water compressed air lift with backwash function according to one or more of the preceding claims 1 to 8 as a load lifter with clogging removal function.

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