Aeration device

Abstract

The invention relates to an aeration device (10) for introducing air into the wastewater of a clarifier (12), comprising a plurality of ventilation lines (14), wherein each ventilation line (14) is connected to an air-fed main line (16) and is fluidically connected thereto, wherein one or preferably more than one ventilation line (14) consists of a plurality of ventilation pipes (18) modularly connected to each other.

Description

[0001] Fumigation facility

[0002] The invention relates to a gassing device for introducing air into the wastewater of a clarification tank.

[0003] Aeration systems for introducing air into the wastewater from a settling tank are available in a wide variety of designs. Aeration systems are used to introduce air, particularly oxygen, into the wastewater during wastewater treatment to facilitate aerobic degradation of the waste materials contained in the wastewater. Since air is always lighter than the wastewater, it must be introduced into the wastewater from the bottom of the settling tank. The introduction must be as widespread as possible to prevent air bubbles from migrating undissolved through the wastewater and emerging at the surface. In this case, the required saturation of the wastewater would not be achieved.

[0004] Known aeration systems comprise several air distribution pipes arranged on the tank floor, on which aerators, in particular membrane tube aerators, membrane plate aerators, or membrane disc aerators, are mounted. In addition, an air supply line is provided, which runs from the top of the tank to the tank floor and merges into a pipe section at the tank floor, namely a main line, which supplies the air distribution pipes with air. The air supply is typically provided by compressed air pumped into the air supply line.

[0005] The aerators are equipped with a flexible membrane to introduce fine air bubbles into the wastewater. However, the aerators can also be equipped with a rigid membrane. In both cases, the membrane wears out through operation in the wastewater, as solids or mineral compounds in the wastewater settle on the membranes over time. To enable renewal without replacing the air distribution pipes, the aerators are mounted on the distribution pipes in a removable manner and / or the membranes are mounted on the aerators in a removable manner. The object of the invention is to improve a gassing device for introducing air into the wastewater from a settling tank in such a way that assembly is simplified and material usage is reduced without impairing the function of the gassing or aeration system.

[0006] This object is achieved by means of a gassing device having the features of claim 1. Further developments and advantageous embodiments of the invention emerge from the subclaims.

[0007] The gassing device according to the invention for introducing air into the wastewater of a clarifier comprises a plurality of aeration lines, each aeration line being connected to and fluidically connected to a main line of an air supply line, preferably arranged in the edge region of the clarifier bottom, fed with air, wherein one or preferably more than one aeration line consists of a plurality of aeration pipes connected to one another in a modular manner.

[0008] In other words, the aeration system according to the invention is advantageously designed such that the aeration lines created from the interconnected aeration pipes or membrane tube aerators perform both the function of fine-bubble aeration of the wastewater and the function of air distribution pipes. For this purpose, several aeration pipes or membrane tube aerators are interconnected, and the resulting aeration line is connected to the main line of the air supply line.

[0009] This eliminates the need for the individual aeration pipes to be laboriously mounted on air distribution pipes. The otherwise conventional air distribution pipes on the tank floor are advantageously eliminated. They are replaced by aeration lines, which preferably consist of several aeration pipes. The aeration lines, which lead directly from the main line, perform the function of injecting air into the wastewater and circulating the air within the clarifier. This surprisingly simplified inventive design of a gassing system, which eliminates the need for air distribution lines according to the prior art, saves material accordingly, thus requiring less energy to manufacture the gassing system and reducing CO2 emissions.

[0010] The modular design of the aeration lines, consisting of several interconnected aeration pipes, simplifies and speeds up installation. Depending on the size of the clarifier, the length of the individual aeration lines can be adjusted by providing a specific number of interconnected aeration pipes.

[0011] Furthermore, since long air distribution lines are no longer required, transport is also easier due to the smaller packaging dimensions of the corresponding components of a fumigation system. Only relatively short ventilation pipes need to be transported, which are then connected to form longer ventilation lines on site.

[0012] It may be advantageous if the aeration pipe comprises a rigid support body, in particular made of metal or preferably plastic, and a membrane arranged on the support body with perforation holes for introducing air into the wastewater. However, it may also be advantageous if the aeration pipe comprises a rigid support body, in particular made of metal or preferably plastic, which, as such, is directly formed with perforation slots.

[0013] The fact that several ventilation pipes, each provided with a membrane, are used to create a ventilation line and not a single continuous ventilation line, i.e. one that is not modularly composed of several ventilation pipes, results in further advantages.

[0014] The membranes experience a pressure drop due to their perforation, so a specific, predefined pressure is required to force the air through the membrane. The pressure drop of all membranes in a gassing device should be as uniform as possible. This is ensured by measuring the pressure drop after the membrane is mounted on the rigid support body. Only those support bodies equipped with a membrane whose membrane exhibits a uniform pressure drop are assigned to a batch for the production of a gassing device. The pressure drop measurement is thus performed on the final product.

[0015] In the case of a long ventilation line consisting of a single long support body that accommodates multiple membranes, all of the membranes would first have to be mounted on the support body and then the pressure drop would have to be measured. However, with such a measurement, only the pressure drop of the membrane with the lowest pressure drop is measured. To prevent this, an additional work step would be required in which the pressure drop of each membrane to be mounted on the long support body would be measured separately. This involves first pre-mounting the corresponding membrane on a short support body, then measuring the pressure drop, then removing it and, depending on the measured pressure drop, mounting it on the long support body intended for multiple membranes. This is complex.

[0016] Flexible membranes consist of tubes manufactured using an extrusion or injection molding process and provided with perforation slots. These tubes are subject to manufacturing tolerances in their wall thickness. A tube can have different wall thicknesses, measured at different locations. The perforation openings in the membrane have a higher opening pressure at a location with a thicker wall thickness than at a location with a thinner wall thickness. When using shorter membranes, the membrane can be tested for opening pressure as described above, and only the membrane with the same opening pressure can be used for a ventilation line. With a long membrane, for example, used as the only membrane in a ventilation line, a deviation in the wall thickness of the membrane would mean that an entire ventilation line could not be used.This is expensive and involves wasteful materials, the production of which results in avoidable CO2 emissions. Furthermore, a long membrane cannot be manufactured using injection molding, which precludes the use of certain advantageous materials for membrane production.

[0017] The modular design also ensures that defective membranes within a ventilation system are easily replaceable by cutting the ventilation system at the connection points of the ventilation pipe with the defective membrane to be replaced and replacing it with a new ventilation pipe with an intact membrane. This would not be possible if multiple membranes were mounted on a continuous support body, which would require the removal of several intact membranes in addition to the defective membrane because the defective membrane would not be able to be pulled over another membrane. A small defect within a long membrane would require the entire ventilation system to be replaced, which would be disadvantageous.

[0018] The aeration system according to the invention offers not only ease of installation, but also reduced costs and CO2 emissions during transport and installation, but also a mechanical advantage during operation. State-of-the-art aerators mounted on air distribution pipes are mounted at a 90° angle to the longitudinal axis of the air distribution pipes, so that the aerators are fixed on one side and freely suspended on the other. In a clarification tank, particularly an aeration tank, with a higher flow rate, this type of installation requires additional securing of the aerators. In aeration tanks through which wastewater flows, aerators can only be arranged in the tank in such a way that the freely suspended ends of the aerators are not subjected to a 90° angle of air flow.By combining the properties of air flow and aeration, the aeration system according to the invention has the advantage that the resulting aeration lines are fixed to the tank floor along their entire length—as will be explained later—and are never free-swinging. Thus, the aeration lines can be installed without regard to the flow in the tank and without additional safeguards. It can be advantageous to provide a downpipe as the supply line, through which air can be directed from the upper edge of the settling tank into the main line.

[0019] It can be advantageous if the aeration pipes forming an aeration line can be of different or identical lengths. This allows the length of the aeration lines to be easily adapted to the on-site conditions, i.e., the dimensions of the treatment tank.

[0020] It may be advantageous to use aeration pipes of 150 cm, 100 cm, or 75 cm in length. These lengths are best used to create aeration lines that cover various clarifier dimensions.

[0021] It can be advantageous if the ventilation pipes forming a ventilation line are detachably connected to each other. This allows for easy replacement of defective ventilation pipes, for example, those with a worn membrane.

[0022] It can be advantageous if the ventilation pipes forming a ventilation system can be plugged together or connected by inserting the respective ends into one another. In principle, various connection techniques for connecting the pipe ends are conceivable. Connection techniques that allow the connected pipes to be easily separated are preferred. The connection should therefore be easy to undo without causing damage.

[0023] It can be advantageous if the pluggable ends of the ventilation pipes are designed in the manner of a bayonet closure, wherein the plug-in end of a ventilation pipe has an outwardly projecting projection and wherein the end of a ventilation pipe receiving the plug-in end has a recess, at the rear end of which an undercut is attached at an angle, such that the projection can be inserted into the recess when the ends are plugged together and engages in the undercut by rotating the ventilation pipe having the projection, so that a connection is created which is fixed in the longitudinal direction but can be released again.It may be advantageous if the recess is wider than the projection, with the recess preferably exceeding the width of the projection by at least twice to a maximum of ten times, particularly preferably by at least three times to a maximum of eight times, and most particularly preferably by at least three times to a maximum of seven times. This ensures that the tubes do not need to be precisely aligned with each other when plugged together.

[0024] It may be advantageous if the recess is designed as a longitudinal slot, which is preferably shorter in length than in width.

[0025] It may be advantageous if the undercut is designed as a transverse slot, which is preferably longer in length than in width.

[0026] It may be advantageous if the main line has a plurality of spaced-apart connecting pieces along its length for connecting a respective ventilation line, each connecting piece having a receptacle into which the end of a first ventilation pipe of the ventilation line to be inserted can be inserted, the connecting piece being designed like the receiving end of a ventilation pipe, so that a connection in the manner of a bayonet closure can be produced.

[0027] It may be advantageous if at least one sealing means is provided between the plugged-together ends of the ventilation pipes and between the receptacle of the connecting piece and the plugged-in end of a first ventilation pipe of the ventilation line.

[0028] It may be advantageous if the sealing means is a sealing ring located on the outside of the plug-in end of the ventilation pipe in a circumferential groove, preferably two, particularly preferably three, sealing rings spaced apart from one another and inserted into corresponding grooves. It may be advantageous if the free end of a ventilation line is closed with a closure element.

[0029] It may be advantageous if each aeration pipe has a fastening tab, preferably connected in one piece therewith, in which a fastening means can be received in order to fix the aeration line both at a distance above the floor of the clarifier and laterally and longitudinally and against twisting about the longitudinal axis of the aeration line, wherein the fastening tab is preferably arranged on the end of the aeration pipe receiving the end to be inserted.

[0030] It may be advantageous if the mounting bracket has a receptacle for a threaded rod extending from the bottom of the clarifier. The receptacle is a through-hole or hole through which the threaded rod, positioned vertically on the floor, can be passed.

[0031] It can be advantageous if the holder for the fastening tab is open at the side, facing away from the ventilation pipe. The lateral opening of the holder is arranged in the fastening tab at a quasi-angular angle, preferably at a 90° angle, to the longitudinal axis of the ventilation pipe, so that the threaded rod can also be positioned in the holder from the side, in particular by rotating the ventilation pipe with the fastening tab around its longitudinal axis. The threaded position can then be secured in a form-fitting manner using a washer, whereby the washer can be pushed over the threaded rod from above and brought into a fit or recess provided in the fastening tab which prevents the threaded rod from moving out sideways. The ventilation pipe with the fastening tab can then be fixed in a force-fitting manner using a nut which can be screwed from above onto the threaded rod and finally onto the washer.

[0032] It may be advantageous to provide an additional washer on the threaded rod, which can be inserted from below into a further slot provided on the mounting bracket. The ventilation pipe with the mounting bracket can then be secured by means of a further nut on the threaded rod, which can be screwed onto the additional washer from below. This allows the ventilation pipe to be precisely fixed at the height above the floor.

[0033] With the aforementioned and subsequently mentioned force-locking fixings, it must be ensured that the fixing is such that thermally induced linear expansion or shrinkage of the connected ventilation pipes in relation to the fixed threaded rod does not lead to tension and thus damage to the connection between the ventilation pipes.

[0034] The expansion of the aeration tubes and thus the aeration strands is caused by warm air flowing through the aeration tubes and / or aeration strands, heating the material of the aeration tubes and / or aeration strands. The air heats up when it is forced through the aeration tubes at the bottom of the pool and compressed by the water column above them.

[0035] It may be advantageous if the fastening tab is designed in such a way that a displacement of the connected ventilation pipes relative to the threaded rod can be realized in the event of thermally induced linear expansion or shrinkage.

[0036] It can be advantageous if the receptacle is designed as an elongated hole, and the respective washer slides within a corresponding fit around the elongated hole as the ventilation pipes expand or contract. This allows movement of the ventilation pipes, and thus of the ventilation line, relative to the fixed threaded rods without compromising the integrity of the connection between two ventilation pipes.

[0037] It can be advantageous if the fastening tab has a receptacle for a fastening means in the form of a threaded rod extending from the floor of the clarification tank, wherein the receptacle of the fastening tab is open on the side facing the end of the aeration pipe to be inserted, i.e. in the longitudinal direction, so that the threaded rod can be positioned in the receptacle from this side when the aeration pipes are plugged together, and wherein the threaded rod can then be fixed in a form-fitting manner by means of a washer which can be pushed over the threaded rod from above and brought into a fit or recess provided on the fastening tab which prevents the threaded rod from moving out, wherein the aeration pipe having the fastening tab can finally be fixed in a force-fitting manner by means of a nut which can be screwed from above onto the threaded rod and finally onto the washer.

[0038] It can also be advantageous here to provide an additional washer on the threaded rod, which can be inserted from below into a further recess or fit provided on the mounting bracket. The ventilation pipe with the mounting bracket can then be secured by means of a further nut on the threaded rod, which can be screwed onto the additional washer from below. This allows the ventilation pipe to be precisely fixed at the height above the floor.

[0039] With the aforementioned force-locking fixation, it is also important to ensure that the fixation is such that thermally induced linear expansion or shrinkage of the connected ventilation pipes in relation to the fixed threaded rod does not lead to tension and thus damage to the connection.

[0040] It may be advantageous if the fastening tab is designed in such a way that the connected ventilation pipes can be displaced relative to the threaded rod in the event of thermally induced longitudinal expansion or contraction. It may be advantageous if the receptacle is designed as an elongated hole, and the respective washer slides within a corresponding fit around the elongated hole in the event of longitudinal expansion or contraction of the ventilation pipes. This allows movement of the ventilation pipes, and thus of the ventilation line, relative to the fixed threaded rods without compromising the integrity of the connection between the ventilation pipes.

[0041] Each threaded rod can therefore be advantageously secured with a predetermined longitudinal clearance. This clearance can be specified by designing the mount as an elongated hole with a corresponding recess around the elongated hole for the washer. The washer can move longitudinally within the fit at a defined torque.

[0042] To compensate for expansion, the fastening tabs on the ventilation pipes - as described above - are provided with a receptacle in the form of an elongated hole that is also open lengthwise to the ventilation pipe. Accordingly, the ventilation pipes are only pushed into each other horizontally when connected and not rotated. The threaded rod is received by or positioned on the side of the receptacle that is open lengthwise. The fastening tab is then designed so that the washers can be moved lengthwise with a corresponding fit when a defined torque is applied to the fastening tab. In other words: when the ventilation line expands due to the effects of heat, the fastening tab moves under or between the two washers. This compensates for the force caused by the expansion.If fastening clamps were used instead of the fastening tabs mentioned, additional space would be required, which would also interrupt the ventilation line.

[0043] Further advantageous embodiments of the invention will become apparent from the drawings in conjunction with their description, wherein the invention is explained below with reference to exemplary embodiments illustrated in the drawings. In these:

[0044] Fig. 1 is a schematic representation of a section of a gassing device according to the invention in an oblique plan view,

[0045] Fig. 2 shows three ventilation pipes of different lengths according to the invention in side view,

[0046] Fig. 3 shows a perspective view of the pluggable ends of two ventilation pipes, Fig. 4 shows a perspective exploded view of the pluggable end of the first ventilation pipe of a ventilation line and the connecting piece receiving this end,

[0047] Fig. 5 shows in perspective the end of a ventilation pipe which receives the end to be inserted,

[0048] Fig. 6 in perspective view the joined ends of two ventilation pipes in an end position,

[0049] Fig. 7 in perspective view two ventilation pipes plugged together in an intermediate position,

[0050] Fig. 8 in a perspective view obliquely from above the end of a ventilation pipe receiving the end to be inserted with a fastening tab according to the invention,

[0051] Fig. 9 in a perspective view from below the end of a ventilation pipe receiving the end to be inserted with a fastening tab according to the invention,

[0052] Fig. 10 in a further perspective view from above, the end of a ventilation pipe receiving the end to be inserted with the fastening tab according to the invention and

[0053] Fig. 11 in a perspective view obliquely from below the end of a ventilation pipe receiving the end to be inserted with a fastening tab according to the invention.

[0054] The drawing shows and explains the features essential for understanding the invention. Where the same reference numbers are used in the figures, they designate the same parts. Fig. 1 shows a schematic representation of a section of a gassing device 10 according to the invention in an oblique plan view. The gassing device 10 according to the invention for introducing air into the wastewater of a settling tank 12 comprises several, in this case five, aeration lines 14 shown in detail, each aeration line 14 being connected to a main line 16 fed with compressed air and arranged in the edge region of the settling tank floor, and being fluidly connected to this main line 16. Each aeration line 14 consists of several aeration pipes 18 connected to one another in a modular manner. In the present case, five aeration pipes 18 of the same length can be seen per aeration line 14.

[0055] Each aeration pipe 18 comprises a rigid support body, preferably made of plastic, and a membrane arranged on the support body with perforations for introducing air into the wastewater. The membrane is clearly visible in Figs. 2-4. In contrast, Figs. 5-7 show only the rigid support body without the membrane arranged on it. This, of course, is part of the aeration pipe 18.

[0056] Air can be conducted from the upper edge of the clarifier 12 into the main line 16 via a downpipe not shown in Fig. 1.

[0057] While in Fig. 1, each aeration pipe 18 of an aeration line 14 has the same length, it can also be advantageous if one or more aeration pipes 18 forming an aeration line 14 have different lengths. Such different lengths of aeration pipes 18 are shown in Fig. 2. Lengths of the aeration pipes 18 of 130 cm, 100 cm, or 75 cm have proven advantageous. These lengths can be freely combined to form the aeration lines 14, so that their lengths can be easily adapted to the on-site conditions, i.e., to the dimensions of the clarifier.

[0058] According to the invention, the ventilation pipes 18 forming a ventilation line 14 are detachably connected to one another so that they can be replaced quickly and easily if necessary, for example, if the membrane of a ventilation pipe 18 is defective. The ventilation pipes 18 forming a ventilation line 14 can be plugged together by inserting the respective ends 20, 22 of the ventilation pipes 18 into one another. Fig. 3 shows a perspective view of the pluggable ends 20, 22 of two ventilation pipes 18.

[0059] The pluggable ends 20, 22 of the ventilation tubes 14 are designed in the manner of a bayonet lock, wherein the plug-in end 20 of a ventilation tube 14 has an outwardly projecting projection 24, and wherein the end 22 of a ventilation tube 14 receiving the plug-in end 20 has a recess 26, at the rear end of which an undercut 28 is attached at an angle. The projection 24 can be inserted into the recess 26 when the ends 20, 22 are plugged together and then engages in the undercut 28 by rotating the ventilation tube 14 having the projection 24 clockwise, so that a connection is created that is longitudinally fixed but can be released again by rotating and pulling apart in the opposite direction.

[0060] In contrast to the recess 26 shown in Fig. 3, the recess 26 shown in Figs. 5-7 is wider than the projection 24. The recess 26 exceeds the width of the projection 24 by at least twice to a maximum of ten times.

[0061] The recess 26 is designed as a longitudinal slot, which, in contrast to the longitudinal slot shown in Fig. 3, is shorter in length than in width in the embodiments according to Figs. 5-7. The undercut 28, in turn, is designed as a transverse slot, which, in contrast to the transverse slot shown in Fig. 3, is longer in length than in width in the embodiments according to Figs. 5-7.

[0062] Fig. 4 shows in a perspective exploded view the plug-in end 20 of the first ventilation pipe 18 of a ventilation line 14 and the connecting piece 30 receiving this end 20. According to the invention, the main line 16 - as can also be clearly seen in Fig. 1 - has a plurality of spaced-apart connecting pieces 30 along its length for connecting a respective ventilation line 14, wherein each connecting piece 30 has a receptacle 32 into which the plug-in end 20 of a first ventilation pipe 14 of the ventilation line 14 can be inserted, wherein the connecting piece 30 is designed like the receiving end 22 of a ventilation pipe 18, so that a connection in the manner of a bayonet closure can be produced.

[0063] As shown in Fig. 3, at least one sealing means 30 is provided between the pluggable ends 20, 22 of the ventilation pipes 18 and - as shown in Fig. 4 - between the receptacle of the connecting piece 30 and the plug-in end 20 of a first ventilation pipe 18 of the ventilation line 14. The sealing means 30 is a sealing ring contained in a circumferential groove on the outside of the plug-in end 20 of the ventilation pipe 18, whereby in the present case, three sealing rings are provided spaced apart from one another and inserted into corresponding grooves.

[0064] It is understood that the free end 22 of a ventilation line is closed with a closure element 34 not shown in the drawing.

[0065] As can be seen in Figs. 1 - 7, each aeration pipe 14 has a fastening tab 36 which is connected in one piece therewith and in which a fastening means in the form of a threaded rod 40 can be received in order to fix the aeration line 14 both at a distance above the floor of the clarifier 12 and laterally and longitudinally and against rotation about the longitudinal axis of the aeration line 14, wherein the fastening tab 36 is arranged on the end 22 of the aeration pipe 18 which receives the end 20 to be inserted.

[0066] The fastening tab 36 has a receptacle 38 in the form of a hole or a through-bore for a fastening means in the form of the threaded rod 40 extending from the bottom of the clarifier 12, wherein the receptacle 38 of the fastening tab 36 is laterally open facing away from the aeration pipe 18, so that the threaded rod 40 can also be positioned in the receptacle 38 from the side, in particular by rotating the aeration pipe 18 having the fastening tab 36 about the longitudinal axis, and wherein subsequently by means of a washer 42, which can be pushed from above over the threaded rod 40 and brought into a fit 44 or recess provided on the fastening tab 36, preventing the threaded rod 40 from moving out laterally, and can be fixed in a form-fitting manner, wherein the aeration pipe 18 having the fastening tab 36 is finally fastened by means of a nut 46, which can be pushed from above onto the threaded rod 40 and finally onto the Washer 42 is screwable,can be fixed with a force fit.,

[0067] Fig. 8 - 11 show in various perspective views from above and below the end 22 of a ventilation pipe 18 receiving the end to be inserted with the fastening tab 36 according to the invention.

[0068] The fastening tab 36 has a receptacle 38 for a fastening means in the form of a threaded rod (not shown here) extending from the bottom of the clarifier, the receptacle 36 of the fastening tab being designed as an elongated hole 48 and being open on the side 50 facing away from the end of the aeration pipe to be inserted in the longitudinal direction, so that the threaded rod can be positioned in the receptacle 38 from this side 50 when the aeration pipes are plugged together, and the threaded rod can then be positively secured by means of a washer (not shown here) which can be pushed over the threaded rod from above and brought into a fit 44 or recess provided on the fastening tab and which prevents the threaded rod from moving out.The ventilation pipe 18, which has the fastening tab 36, can finally be fixed in a force-locking manner by means of a nut (not shown here), which can be screwed from above onto the threaded rod and finally onto the washer. A further washer (not shown here) located on the threaded rod is advantageously provided, which can be brought from below into a further fit 44a or recess provided on the fastening tab 36, wherein the ventilation pipe 18, which has the fastening tab 36, can then be fixed in a force-locking manner by means of a further nut (not shown here) located on the threaded rod, which can be screwed from below onto the further washer. This allows the ventilation pipe 18 to be fixed exactly at the height above the floor. With the aforementioned force-locking fixations, care must be taken to ensure that the fixation is such that thermally induced linear expansion orShrinkage of the connected ventilation pipes 18 relative to the fixed threaded rod does not lead to tension and thus damage to the connection. This is ensured in particular by the receptacle 38 being designed as an elongated hole 48, as shown in Figs. 8-11, and the respective washer sliding longitudinally within a corresponding fit 44, 44a formed around the elongated hole 48 upon longitudinal expansion or contraction of the ventilation pipes 18. This enables movement of the ventilation pipes 18, and thus of the ventilation line, relative to the fixed threaded rods, without compromising the integrity of the connection provided between the ventilation pipes.

[0069] List of reference symbols

[0070] (is part of the description)

[0071] 10 Fumigation device

[0072] 12 clarification tanks

[0073] 14 Ventilation line

[0074] 16 Main line

[0075] 18 Ventilation pipe

[0076] 20 End

[0077] 22 End

[0078] 24 lead

[0079] 26 recess

[0080] 28 Undercut

[0081] 30 connector

[0082] 32 sealants

[0083] 34 locking element

[0084] 36 Mounting tab

[0085] 38 recording

[0086] 40 threaded rod

[0087] 42 Washer

[0088] 44 Fit

[0089] 46 Mother

[0090] 48 slot

[0091] 50 side opening

Claims

Patent claims 1. A gassing device (10) for introducing air into the wastewater of a clarifier (12), comprising a plurality of aeration lines (14), each aeration line (14) being connected to a main line (16) fed with air and fluidically connected thereto, one or preferably more than one aeration line (14) consisting of a plurality of aeration pipes (18) connected to one another in a modular manner.

2. Gassing device (10) according to claim 1 or 2, characterized in that the aeration pipe (18) has a rigid support body, in particular made of metal or preferably of plastic, and a membrane arranged on the support body with perforation holes for introducing the air into the wastewater and / or that the aeration pipe (18) has a rigid support body which is provided with perforation slots.

3. Gassing device (10) according to claim 1, characterized in that a downpipe (20) is provided, via which air can be guided from the upper edge of the clarifier (12) into the main pipe (16).

4. Gassing device (10) according to at least one of the preceding claims, characterized in that the ventilation pipes (18) forming a ventilation line (14) can have a different or the same length.

5. Gassing device (10) according to at least one of the preceding claims, characterized in that the ventilation pipes (18) forming a ventilation line (14) are detachably connected to one another.

6. Gassing device (10) according to at least one of the preceding claims, characterized in that the gases forming a ventilation line (14) Ventilation pipes (18) can be plugged together, in particular by plugging the respective ends (20, 22) of the ventilation pipes (18) into one another.

7. Gassing device (10) according to at least one of the preceding claims, characterized in that the pluggable ends (20, 22) of the ventilation pipes (14) are designed in the manner of a bayonet closure, wherein the plug-in end (20) of a ventilation pipe (14) has an outwardly projecting projection (24) and wherein the end (22) of a ventilation pipe (14) receiving the plug-in end (20) has a recess (26), at the rear end of which an undercut (28) is attached at an angle, wherein the projection (24) is inserted into the recess (26) when the ends (20, 22) are plugged together and engages in the undercut (28) by rotating the ventilation pipe (14) having the projection (24), so that a connection is formed which is fixed in the longitudinal direction but can be released again.

8. Gassing device (10) according to at least one of the preceding claims, characterized in that the recess (26) is wider than the projection (24), wherein the recess (26) exceeds the width of the projection (24) preferably by at least twice to a maximum of ten times, particularly preferably by at least three times to a maximum of eight times, most preferably by at least three times to a maximum of seven times.

9. Gassing device (10) according to at least one of the preceding claims, characterized in that the recess (26) is designed as a longitudinal slot which is preferably shorter in length than in width.

10. Gassing device (10) according to at least one of the preceding claims, characterized in that the undercut (28) is designed as a transverse slot which is preferably longer in length than in width.

11. Gassing device (10) according to at least one of the preceding claims, characterized in that the main line (16) has several spaced-apart connecting pieces (30) along its length for connecting a respective ventilation line (14), wherein each connecting piece (30) has a receptacle (32) into which the plug-in end (20) of a first ventilation pipe (14) of the ventilation line (14) can be inserted, wherein the connecting piece (30) is designed like the receiving end (22) of a ventilation pipe (18), so that a connection in the manner of a bayonet closure can be produced.

12. Gassing device (10) according to at least one of the preceding claims, characterized in that at least one sealing means (30) is provided between the plugged-together ends (20, 22) of the ventilation pipes (18) and between the receptacle of the connecting piece (30) and the plugged-in end (20) of a first ventilation pipe (18) of the ventilation line (14).

13. Gassing device (10) according to at least one of the preceding claims, characterized in that the sealing means (30) is a sealing ring contained on the plug-in end (20) of the ventilation pipe (18) on the outside in a circumferential groove, wherein preferably two, particularly preferably three sealing rings spaced apart from one another and inserted in corresponding grooves are provided.

14. Gassing device (10) according to at least one of the preceding claims, characterized in that the free end (22) of a ventilation line is closed with a closure element (34).

15. A gassing device (10) according to at least one of the preceding claims, characterized in that each aeration pipe (14) has a fastening tab (36) which is preferably connected to it in one piece and in which a fastening means can be received in order to fix the aeration line (14) both at a distance above the floor of the settling tank (12) and laterally and in the longitudinal direction and against twisting about the longitudinal axis of the aeration line (14), wherein the fastening tab (36) is preferably arranged on the end (22) of the aeration pipe (18) which receives the end (20) to be inserted.

16. A gassing device (10) according to at least one of the preceding claims, characterized in that the fastening tab (36) has a receptacle (38), preferably an elongated hole (48), for a fastening means in the form of a threaded rod (40) extending from the bottom of the clarifier (12), wherein the receptacle (38) of the fastening tab (36) is laterally open, pointing away from the aeration pipe (18), so that the threaded rod (40) can also be positioned in the receptacle (38) from this open side, in particular by rotating the aeration pipe (18) having the fastening tab (36) about its longitudinal axis, and wherein the threaded rod can then be positively secured by means of a washer (42) which can be pushed from above over the threaded rod (40) and brought into a fit or recess (44) provided on the fastening tab (36) and which prevents the threaded rod (40) from moving out laterally.wherein the ventilation pipe (18) having the fastening tab (36) can finally be fixed in a force-fitting manner by means of a nut (46) which can be screwed from above onto the threaded rod (40) and finally onto the washer (42).

17. A gassing device (10) according to at least one of the preceding claims, characterized in that the fastening tab (36) has a receptacle (38), preferably an elongated hole (48), for a fastening means in the form of a threaded rod (40) extending from the bottom of the clarifier (12), wherein the receptacle (38) of the fastening tab (36) is open on the side facing the end (20) of the aeration pipe (40) to be inserted, so that the threaded rod (40) can be positioned in the receptacle (38) from this side (50) when the aeration pipes (14) are plugged together, and wherein the threaded rod can then be positively secured by means of a washer (42) which can be pushed from above over the threaded rod (40) and brought into a fit (44) or recess provided on the fastening tab (36) which prevents the threaded rod (40) from moving out, wherein the fastening tab (36) having a ventilation pipe (14) finally by means of a nut (46),which can be screwed from above onto the threaded rod (40) and finally onto the washer (42), and can be fixed in a force-locking manner.

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