DE102016117462B3 - Pressurized water water jacks with pollution protection - Google Patents

Abstract

The present invention relates to a Druckluftklarwasserheber with impurity protection, a method for its operation and its use in containers of biological treatment plants to prevent contamination of the clear water during filling and ventilation of the reactor during normal operation of the compressed air water heater in the sewage treatment plant.

Description

The present invention relates to a compressed water clear water jack with contamination protection, a method for its operation and its use in containers of biological treatment plants to prevent contamination of the clear water during filling and ventilation of the reactor during normal operation of the compressed air water heater in the sewage treatment plant.

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 tank to another or the resulting clear water in the drainage of the sewage treatment plant to promote. Air lifts consist of a tube open on both sides with a side-mounted compressed air connection. 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 tank so that the siphon above the compressed air connection is well filled with water, the compressed air flows through the air inlet opening into the siphon when the compressed air generator is switched on 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 treatment plant container is lowered so that now the shortened path in the siphon tube, the buoyancy forces of the high-flowing air bubbles can no longer entrain water, or the compressed air generator is turned off. In biological wastewater treatment plants, especially in SBR wastewater treatment plants, the influent waste water 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 freely floating bacteria can breathe there and purify the wastewater through their metabolic processes. After this cleaning phase, the ventilation is switched off, so that the bacteria, also known as activated sludge, can settle by sinking to the ground. After this clear water settling phase, a clear water zone is formed above the bacterial layer, which is then pumped by the clear water jack, in the same function as described, into the drain of the sewage treatment plant.

At the same time, excess bacteria, e.g. through the operated parallel to the clear water jack excess sludge lift, in lesser quantity, because of the smaller sized siphon tube or by the throttled air supply, pumped into the primary treatment.

After this clear water pumping time, the sewage treatment cycle begins again with the feed pumping time, with the feed lifter pumping the pre-treatment water into the reactor in preprogrammed time. The compressed air for the feed lifter, for the plate ventilator or pipe aerator and for the clear water or excess siphon is switched by means of individual electromagnetically operated 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 is allowed to flow over the lower edge of the suction port. By virtue of this necessity for pumping off the upper clear water area and not the underlying area of settled bacteria, it is necessary to guide the suction pipe following the suction opening vertically downwards and over a U-shaped 360 degree bend with the following vertically upwards Connecting siphon. So that the 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.

These compressed air lifters, which are designed by almost all manufacturers, have the disadvantage that, when the reactor is being filled, the pre-treatment water flows into the intake opening of the clear water lift by means of a feed lifter and particles can settle there.

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, because of the volume increase described, are pressed into the clear water. Since the activated sludge bacteria are heavier than water, they sink down in the intake pipe and fill the pipe bends, which connect the intake pipe and the siphon pipe. 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 promoted away and only clear water from the clear water zone of the reactor is promoted in the flow of 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 leaching behind the wastewater treatment plant, which is slowly silted up and rendered useless by the sludge removal.

The same applies if there is a receiving water downstream of the sewage treatment plant, which creates a biological imbalance due to the sludge load and the associated oxygen reduction in the water of the receiving water.

To solve these drawbacks, a clear water lifter should be designed so that no water-activated sludge mixture can penetrate into the intake, or this settled activated sludge is washed away from the clear water jack before the Klarwasserpumpzeit and thereby the sludge of infiltration, and the contamination 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 and DE 10 2007 058 177 A1 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 floating in the sewage hair or similar parts wrap around the flaps or valves so that the desired closure forces no longer work after some time or must be constantly cleaned by extensive maintenance, which is a major drawback of this technical solution.

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.

A disadvantage of this technical solution 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.

DE 20 2005 003 588 U1 discloses a small wastewater treatment plant with a pre-clearing chamber and a secondary clarifier, wherein in each chamber at least one air lift is provided, with the air under the appropriate medium in the sense of lifting from the respective chamber is conveyed, with each compressed air lifter associated, connected to a compressed air unit compressed air line in a lever line is arranged, wherein the medium can be guided by the intermediate space formed between the outer wall of the compressed air line and the inner wall of the lifting line.

DE 24 20 076 A1 discloses a device for continuously introducing oxygen into waste water under elevated hydrostatic pressure, wherein a gas inlet is arranged in the lower part of a shaft, and a liquid inlet and a liquid outlet is arranged on a reservoir arranged above the shaft and connected thereto.

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 proposed solutions, attempts are made to prevent the penetration of activated sludge during the ventilation in the reactor by means of flow and discharge devices at the intake point of the clear water jack. Through certain pipe arrangements it is attempted that during the aeration flowing water - activated sludge mixture of the direct intake of the suction pipe from Keep clear water jack, or 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 case, 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 in the output side riser so that it flows in free fall through the pump and entrains the lying there activated sludge and flow into the reactor. 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. The water column in the siphon tube was raised by a brief burst of compressed air. The necessary inflowing water was low, since the increase in volume in the riser, for the most part, comes from the inflowing air bubbles. The falling water column, must first separate from the rising air bubbles and therefore does not have the speed required to take the activated sludge in the U-shaped pipe part so that it ascending reaches the suction port to get there in 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 thus flushed out is small and corresponds only to the amount of the clear water activated sludge mixture of the volume from the buffer tank. 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 insufficient 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.

EP 2 743 515 A2 discloses a clear water lifter, wherein at the intake manifold, an intake manifold is formed as an inverted Siphonvorrichtung, which has an inverted U or V-curve and merges into a dip tube socket with suction. In operation, there is an air bubble in this intake, which allows the entry of water only with large pressure differences done, but not prevented.

According to the disclosure of DE 10 2011 122 695 A1 takes place a hydraulic and pneumatic backwashing in clear water, the activated sludge particles, which are located in the clear water, are at the latest displaced by the water in the middle wall hollow body so that they are flushed through the intake of the clear water jack back into the reactor.

A disadvantage of the two latter technical solutions is that the second-exact Zeittackt for backwashing by the electrical, pneumatic and hydraulic time chain is influenced by many unwanted variables. In addition, it is disadvantageous that the required second-exact backflushing process is no longer guaranteed after long periods of operation of the compressed air clear water lifter, since the pressure generated by the compressed air compressor decreases steadily due to age.

It would thus be advantageous if a clear water water is designed so that it is rinsed before clear water delivery in such a way that the rinsing water mixed with activated sludge bacteria flows directly back into the reactor water.

According to EP 2 641 876 A1 This can be practiced relatively complex as follows:

When the compressed air flows into the clear water lift, the first pumped water mixed with activated sludge is conveyed for a short time in an extra container. By a bottom opening on the container flows through an open float mechanism into the primary treatment, thus fulfilling the excess sludge function. If this process is repeated several times, the clear water jack is cleaned. In the following continuous operation, the float opening closes at the bottom of the container and the pumped clear water flows through the container in the flow of the sewage treatment plant. The water level in the tank is monitored by a float switch.

The disadvantage of this technical solution is that impurities on the float combination on the container does not work. If this float mechanism is disturbed / blocked, the short-term promoted activated sludge-water mixture can not flow back into the primary treatment, thus flows into the process, or in the subsequent clear water production, the clear water flows back as a partial flow in the primary treatment.

A fault in the mechanical float mechanism either leads to contamination at the drainage of the sewage treatment plant or to overstocks in the sewage treatment plant.

A disadvantage is also that a float switch, as a source of interference in the container is necessary to detect the operating state of the treatment plant.

• • ein senkrechtes, oben offenes Ansaugrohr mit einer Ansaugöffnung in seiner Wand und zwei senkrechten, parallel zueinander verlaufenden Druckluftheberrohren in Form eines Überschussschlammheberrohrs und eines Klarwasserheberrohrs, wobei das Ansaugrohr und die zwei Druckluftheberrohre unten in einen gemeinsamen Verbindungsraum in Form eines Verbindungsrohres münden,
• • eine Druckluftleitung, welche mit einem Druckluftverdichter verbindbar ist, mit einer Lufteintrittsöffnung, welche an der Verbindungsstelle des Überschussschlammheberrohrs, des Klarwasserheberrohrs und des Verbindungsrohrs angebracht ist, wobei das Überschussschlammheberrohr oben offen ist und seitlich oberhalb der maximalen Wasserhöhe in das Reaktorwasser, in die Vorklärung der Kläranlage, in einen Schlammbehälter, in eine Filtertasse / Filtersack oder in einen schlammstabilisierenden Komposter einleitbar und das Klarwasserheberrohr oben offen und seitlich in den Kläranlagenabfluss einleitbar ist,
• • eine Steuerung, welche den Druckluftverdichter ein- und ausschalten lässt,
• • wobei das Klarwasserheberrohr im oberen Bereich in seinem Durchmesser erweitert ist und als Wasserpuffer dient und die Ansaugöffnung einen nach unten abgewinkelten offenen Rohrstutzen besitzt, welcher in der Wand des Ansaugrohres in der Höhe der Klarwasserzone des Reaktorwassers anbringbar ist, in dem dieses einteilige Rohrsystem im Reaktorwasser einer biologischen Kläranlage fest montierbar ist.

In addition, the reveals DE 10 2014 015 488 A1 a dual functional air lift. This includes:

• A vertical, open-topped intake manifold with an intake opening in its wall and two vertical, parallel to each other compressed air lift tubes in the form of a surplus sludge jack tube and a clear water jack tube, wherein the intake manifold and the two compressed air lift tubes open into a common connection space in the form of a connecting tube
• A compressed air line which can be connected to a compressed air compressor, with an air inlet opening which is attached to the junction of the excess sludge jack tube, the clear water jack tube and the connecting pipe, the excess sludge jack tube is open at the top and laterally above the maximum water level in the reactor water, in the primary Sewage treatment plant, in a sludge tank, in a filter cup / filter bag or in a sludge-stabilizing composter can be introduced and the clear water jack tube is open at the top and laterally introduced into the wastewater treatment plant effluent,
• • a control that allows the air compressor to be switched on and off,
• • wherein the clear water jack tube is widened in its upper part in diameter and serves as a water buffer and the suction port has a downwardly angled open pipe socket which in the wall of the intake pipe at the level of the clear water zone of the reactor water can be attached, in which this one-piece pipe system in the reactor water a biological treatment plant is permanently mounted.

The disadvantage of this technical solution is that a control is provided for operating the dual-functional air lift, which allows the air compressor continuously in short intervals on and off to achieve its functionality. Due to the occurring very short switching times and the very high frequencies of switching on and off of the air compressor, this wears out in a very short time and it comes thereby to the failure of the air compressor, resulting in service life of the entire treatment plant and thus the faulty course of biological clarification. Furthermore, it is disadvantageous that even with this technical solution the second-exact switch-on with increasing wear of the air compressor can not be met.

The German utility model DE 20 2015 105 725 U1 discloses a three-functional air lift, which has two parallel siphon tubes with a common intake pipe. With the excess sludge jack tube, the sediments in the pipe system are first conveyed away in order to subsequently be able to pump out the clear water with the clear water jack tube.

The disadvantage of this technical solution is that the activated sludge is first conveyed upwards with a long siphon tube instead of rinsing it back directly into the reactor.

This disadvantage is due to the fact that only during the aeration phase, the water-activated sludge mixture is carried away as excess sludge function and only so the activated sludge concentration can be reduced.

The deduction of the excess activated sludge during the clear water withdrawal phase is not possible because only one intake pipe for the clear water is present. - If it is technically possible, however, the excess sludge should always be pumped off during or after clear water settling phase at a fixed height, because only then can an activated sludge layer sedimented in height always be produced consistently.

In order to work with a constant activated sludge concentration, so must also Activated sludge flushed out of the clear water lift is introduced into the reactor water on the shortest path, so that the sedimented activated sludge layer height in the clear water phase is the determining element for the purification performance of the biological sewage treatment plant.

In summary, it can be stated with regard to the prior art that the root cause of the formation of deposits in the clear water pressure air lifter is that the volume increase arising when the aeration of the reactor is switched on increases the water level and, of course, the activated sludge mixture into the intake opening of the Clear water water flows in and raises the water level in the open intake pipe and in the siphon tube.

This flowed into the clear water pressure air lifter activated sludge amount sediments there and fills the U-shaped connecting pipe between the intake manifold and siphon with these deposits. As the aeration is constantly turned on and off at intervals, this process repeats itself very often and causes the amount of these contaminants to increase at the timing of the aeration intervals.

Each time the air compressor is turned off, the amount of water that has previously flowed into the suction port then flows back into the reactor, but the sludge fractions that have sedimented out in the meantime always remain in the clear water lift U-shaped connecting pipe.

The amount of impurities in the clear water pressure air lifter increases many times faster if, during the time of aeration of the reactor water this is filled with raw sewage. This increases the volume of the reactor, the water level rises quickly. The water levels in the clear water lift rise by the same amount. The newly introduced into the clear water water remains there, but the activated sludge contaminants sediment down and remain in the clear water pressure airlift.

All of the methods disclosed by the prior art have this problem and solve it only partially, insufficiently or only with great technical effort.

The invention is therefore based on the object to provide a comparison with the prior art improved Druckluftklarwasserheber for biological treatment plants, which handles the water-activated sludge mixture so that no impurities can flow during the increase in volume during the ventilation process in the intake of the compressed water clear water jack.

The invention is also based on the object of specifying a method for operating such a compressed water clear water jack in biological sewage treatment plants.

Furthermore, the object of the invention is to specify possible uses by a targeted combination of the clear water with other components in biological treatment plants.

According to the invention, these objects are achieved by an article according to claim 1, a method according to claim 7 and a use according to claim 9. Further favorable embodiments of the invention are specified in the subordinate claims.

The compressed water clear water jack comprises a siphon tube with a suction opening in the upper free end of the tube above the maximum water level and a suction tube with its tube vent in the upper free end of the tube, which ends above the maximum water level.

The intake pipe has a side suction opening, which is located in the height of the minimum water level. The siphon pipe and the intake pipe merge at their respective lower free end into a connecting pipe, so that they are connected to one another in a U-shaped, liquid-conducting, hydraulically tight manner via this connecting pipe.

In the immediate vicinity of this U-shaped connection, an air inlet opening in the form of a through hole with air hose connection point is arranged in the lower part of the siphon pipe according to the prior art in the wall of the pipe through which compressed air can be directed.

In addition, and for the operation of the compressed water clear water jack, in the immediate vicinity of the U-shaped connection in the lower region of the intake pipe in the wall of the tube also a ventilation inlet opening in the form of a through hole with Luftschauchanschlussstelle arranged by which also compressed air is selectively flowed.

The compressed air water heater is designed for biological wastewater treatment plants (reactors). For this purpose, the siphon tube (when used as intended) discharges above the maximum reactor water height from below in a watertight manner into a sampling vessel which has an open drainage pipe to the wastewater treatment plant outlet laterally.

It is essential in this compressed water clear water jack that at the suction port form-fitting tight a downwardly open buffer tank or a Buffer tube is arranged, which / which is open in the direction of the U-shaped connection of suction and siphon tube.

This buffer container or buffer tube must be equal in volume or greater than the amount that can flow when filling the reactor between the minimum water level and the maximum water level in the compressed water clear water jack.

The background of this technical solution is that the content in the buffer tube is reactor water which has precipitated out and, with an increase in volume through the aeration or an increase in volume during the filling of the reactor, only this sedimented water in the buffer tube flows into the intake opening of the compressed water clearer and impurities have already been introduced into the receiver in the direction of the U-shaped connection of suction and siphon down bottom open buffer tank or buffer tube can settle down into the reactor.

So that the buffer tank or the buffer tube does not have to be dimensioned too large in volume, the intake pipe of the compressed air water heater is made very thin above the suction port.

The technical background is to reduce the volume in the clear water, so that when a volume increase in the reactor flowing into the clear water buffer water essentially flows only in the siphon pipe and only there rises the water level as in the reactor.

In this case, the intake pipe very thin executed above suction pipe performs a venting function, this above the intake very thin running intake pipe can also be replaced by a thin vent tube or a thin vent hose, which also generates the vent function.

It is also essential that the / in the direction of the U-shaped connection of suction and siphon down open buffer tank / buffer tube is protected from rising air bubbles. For this reason, a bubble protection in the form of a Ableitschräge, eg. A planar Ableitblech with a continuous surface, as protection against air bubbles must be arranged below the buffer tank / buffer tube opening, which deflects ascending ventilation bubbles and slip off the sedimenting during the clear water settling phase activated sludge constituents on its smooth surface , and thereby transported back into the reactor water, in which they continue to fall.

Without this bladder protection, the activated sludge-water mixture swirled up in the aeration would produce turbulence in the buffer tank / buffer pipe and the clear water precipitated there would mix with the activated sludge-water mixture in the compressed water water jack.

It is advantageous to open the bottom open buffer vessel / buffer tube with one or more vertically, i. Divide partition walls running parallel to the intake manifold. These additional partitions suppress turbulence in the interior of the buffer tank, especially when a pipe aerator in the reactor is in the immediate vicinity below the buffer pipe.

It is also advantageous if the compressed water rifle lifting parts located above the buffer tank / buffer pipe are so inclined (i.e., at an angle to the siphon pipe and the intake pipe) that no activated sludge bacteria can settle there. This also means that the vertically standing central walls in the buffer tube are bevelled correspondingly at their upper side facing the intake pipe which is very thin above the intake opening.

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

• 1: eine schematische Darstellung einer Ausführungsform eines Druckluftklarwasserhebers gemäß dem Stand der Technik und
• 2: eine schematische Darstellung einer Ausführungsform eines erfindungsgemäßen Druckluftklarwasserhebers.

Showing:

• 1 : A schematic representation of an embodiment of a compressed air clear water lifter according to the prior art and
• 2 : a schematic representation of an embodiment of a compressed air water heater according to the invention.

The 1 shows a compressed water clear water jack comprising a siphon tube ( 1 ) with an exit opening ( 2 ) in the upper free end of the tube above the maximum water level ( 3 ) and an intake pipe ( 4 ) with its pipe vent ( 5 ) in the upper free end of the tube, which above the maximum water level ( 3 ) ends.

The intake pipe ( 4 ) has an intake opening at the side ( 6 ) with its lower edge at the level of the minimum water level ( 7 ) is located.

The siphon tube ( 1 ) and the intake pipe ( 4 ) go at their respective lower free end in a U-shaped connecting tube ( 8th ), so that they are liquid-conducting, hydraulically directly connected via this connecting tube.

In the immediate vicinity of this U-shaped connecting tube is in the lower part of Siphon tube ( 1 ) an air inlet opening ( 9 ) arranged in the form of a through hole with an air hose connection point, through which compressed air from a compressed air generator ( 10 ) is targeted einströmbar.

The compressed air water heater is for biological wastewater treatment plants in the reactor vessel ( 11 ). For this purpose, the siphon tube ( 1 ) at its intended use above the maximum water level ( 3 ) watertight into a sampling vessel ( 12 ), which flows laterally into an open drainage pipe to the wastewater treatment plant ( 13 ).

A disadvantage of this compressed air water heater is that with a volume increase of the reactor water ( 14 ) whose water level rises and this in the intake pipe ( 4 ) and in the siphon ( 1 ) by flowing into the suction port ( 6 ) equalizes in height, that in the inflowing reactor water ( 14 ) containing impurities in the siphon ( 1 ) and in the intake pipe ( 4 ), sink down and both tubes and the U-shaped connecting tube ( 8th ) with impurities, especially with activated sludge bacteria, fill.

It is particularly disadvantageous if the in 1 illustrated compressed air generator ( 10 ) of the compressed water clear water lift for the purpose of clear water withdrawal from the control ( 16 ) and the compressed air through the corresponding switching valve, through the compressed air hose ( 15 ) in the air inlet opening ( 9 ) flows in and the water supply on clear water pressure air lifter begins, and the impurities as the first in the treatment plant effluent ( 13 ) and the subsequent infiltration is clogged.

2 shows one opposite 1 Essentially identical compressed air water heater, but which has the following technical features / modifications:

At the intake ( 6 ) is positively and tightly a downwardly open buffer container or a buffer tube ( 17 ) whose volume is equal to or greater than the amount of reactor water ( 14 ) which, when filling the reactor vessel ( 11 ) between the minimum water level ( 7 ) and the maximum water level ( 3 ) by the resulting pressure equalization in the suction port ( 6 ) of the clear water pressure air lift can flow.

The technical background of this solution is that the contents in the buffer tank or buffer tube ( 17 ) sedimented reactor water ( 14 ) from the clear water zone of the reactor vessel ( 11 ) and, in the case of a volume increase, either by the onset of intermittent aeration or by the filling of the reactor vessel ( 11 ) only this sedimented clear water in the buffer tube ( 17 ) in the suction opening ( 6 ) of the clear water lift and impurities already in the bottom open buffer tube ( 17 ) have settled.

So that the buffer tube ( 17 ) in its volume is not too large to dimension, the intake pipe ( 4 ) above the intake opening ( 6 ) be made very thin.

The technical background of this solution is to reduce the total volume in the clear water by so that when a volume increase in the reactor vessel ( 11 ) the buffer water flowing into the clear water jack essentially only the water in the siphon tube in its volume and in its water level with the water level in the reactor vessel ( 11 ) compensates.

For this reason, the intake pipe ( 4 ), which above the intake ( 6 ), in a very thin vent pipe ( 18 ), which has a venting function and can also be replaced by a thin venting tube or a thin venting tube. The ratio vent pipe ( 18 ) to the siphon ( 1 ) is advantageously about 1: 4.

So that the clear water content of the buffer tube ( 17 ) is protected during the aeration phase from rising air bubbles and the associated turbulence with the activated sludge-water mixture, below the buffer container opening ( 19 ) a Ableitschräge ( 20 ) may be attached as bladder protection.

The discharge slope ( 20 ) is inclined at one with respect to the intake pipe ( 4 ) acute angle with a tip in the direction of the vent tube ( 18 ), so that the ventilation bubbles from the buffer container opening ( 19 ) and the sludge particles sedimented out during the clear water settling phase can slip on the sloping surface and sink downwards without being sucked in as impurities in the subsequent clear water production.

When the pipe aerator ( 22 ) in the reactor vessel ( 11 ) in the immediate vicinity of the buffer tube ( 17 ), it is advantageous to open the buffer container opening ( 19 ) into smaller segments in the form of vertical partitions ( 21 ) so that the generated water flows at the buffer container opening ( 19 ) to be interrupted. It is important that the partitions ( 21 ) Beveled above and thereby no activated sludge bacteria can settle in this place.

LIST OF REFERENCE NUMBERS

1 -

siphon tube

2 -

output port

3 -

maximum water level

4 -

intake

5 -

Pipe vent

6 -

suction

7 -

minimal water level

8th -

U-shaped connecting tube

9 -

Air inlet opening

10 -

Air compressor

11 -

reactor vessel

12 -

sampling vessel

13 -

effluent

14 -

reactor water

15 -

Compressed air line

16 -

control

17 -

buffer tube

18 -

vent pipe

19 -

Buffer container opening

20 -

Ableitschräge

21 -

partitions

22 -

tube diffusers

23 -

impurities

Claims (9)

A compressed water water jack comprising a siphon pipe (1) with an outlet opening (2) in the upper free end of the pipe above the maximum water level (3) and an intake pipe (4) with its pipe vent opening (5) in the upper free end of the pipe, which is above the maximum water level (3) ends, wherein - the suction pipe (4) laterally has a suction opening (6), which is located with its lower edge in the height of the minimum water level (7), - the siphon pipe (1) and the intake pipe (4) at its each lower free end in a U-shaped connecting tube (8) pass, so that they are liquid-conducting, hydraulically directly connected via this connecting tube and - in the immediate vicinity of this U-shaped connecting tube in the lower region of the siphon tube (1) an air inlet opening (9 ) is arranged in the form of a through hole with an air hose connection point, through which compressed air from a compressed air generator (10) enters selectively is ömbar, characterized in that • to the suction port (6) positively and tightly an open buffer container or a buffer tube (17) is arranged, which / in the direction of the U-shaped connection of the intake pipe (4) and siphon (1) open is and whose volume is equal to or greater than a reactor water amount (14) which can flow during filling of the reactor vessel (11) between the minimum water level (7) and the maximum water level (3) by the resulting pressure equalization in the suction port (6) of the compressed water clear water jack , • the intake pipe (4) above the suction port (6) is made very thin in diameter, wherein the intake pipe (4) merges into a very thin in its diameter vent pipe (18), • and below the buffer tank opening (19) a Ableitschräge (20) is located as a bubble protection, the Ableitschräge (20) obliquely with respect to the intake pipe (4) acute angle with apex in the direction of the vent pipe (18) is arranged. Compressed air water lifter according to Claim 1 , characterized in that the ratio of vent pipe (18) to siphon pipe (1) is about 1: 4. Compressed air water lifter according to Claim 1 , characterized in that the Ableitschräge (20) obliquely with a relative to the intake pipe (4) acute angle with a tip in the direction of the vent pipe (18) is arranged. Compressed air water lifter according to Claim 1 , characterized in that the located above the buffer tank / buffer tube (17) located Druckluftklarwasserheberteile at an angle to the intake pipe (4), in which the suction port (6) at an acute angle between the intake pipe (4) and vent pipe (18) opens. Compressed air water lifter according to Claim 1 , characterized in that in the buffer container opening (19) smaller segments in the form of vertical partitions (21) are arranged for subdivision, which are bevelled in the direction of the suction port (6). Compressed air water lifter according to Claim 1 , characterized in that the venting tube (18) is replaced by a venting tube or by a thin venting tube. The compressed water water heater according to one or more of Claims 1 to 6 , characterized in that the siphon pipe (1) above the maximum water level (3) watertight in a sampling vessel (12) opens, which laterally a has open drainage pipe to sewage treatment plant outlet (13) out. Method for operating a compressed air water heater according to one or more of Claims 1 to 7 in which by the control (16) of the compressed air generator (10) of the compressed air water heater is turned on for the purpose of clear water withdrawal and the compressed air through the corresponding switching valve controlled by the compressed air hose (15) flows into the air inlet opening (9) and the water supply begins at the compressed water clear water lifter, said The content in the buffer vessel / buffer tube (17) is outdated reactor water (14) and, in the case of an increase in volume through the aeration or an increase in volume during the filling of the reactor (11), only this sedimented water in the buffer vessel / buffer tube (17) into the suction opening ( 6) of the compressed air water heater flows in and impurities already in the direction of the U-shaped connection of suction (4) - and siphon (1) open down the buffer vessel / buffer tube (17) down into the reactor (11) can settle. Protected by the below the buffer container opening (19) Ableitschräge (20) of the clear water content of the buffer tube (17) during the aeration phase before rising air bubbles and the associated turbulence with the activated sludge-water mixture in which the venting bubbles from the buffer container opening (19) be deflected and the sedimented during the Klarwasserabsetzphase sludge particles on the inclined surface of Ableitschräge (20) slip down and without these are sucked in the subsequent clear water production as impurities, so that the content in the buffer tube (17) outdimented reactor water (14) from the clear water zone of the reactor vessel (11) and at a volume increase either by the onset of intermittent aeration or by filling the reactor vessel (11) only this sedimented clear water in the buffer tube (17) into the suction port (6) of the Kl Water inlet flows and impurities have previously deposited in the bottom open buffer tube (17). Use of the compressed air water heater according to one or more of the Claims 1 to 7 in a biological sewage treatment plant, the siphon tube (1) when used as intended above the maximum reactor water level from below watertight into a sampling vessel (12), which laterally has an open drain pipe to sewage treatment plant outlet (13) out.

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