WO2010086423A1 - Aerator - Google Patents

Abstract

The invention relates to a gassing device for injecting gas into liquids, in particular compressed air into wastewater, comprising at least one elongated aerator unit (10), at the end face of which the gas can be introduced and at the outer circumference of which the gas can escape into the liquid. The invention is characterized in that the aerator unit (10) is held by an enclosing frame (12), which at the location of a connection point of the aerator unit to the frame comprises a hollow connection space (18) for conducting the gas to be fed through the frame into the aerator unit.

Description

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The invention relates to a gassing device for introducing gas into liquids, in particular compressed air in wastewater.

When fumigating waste water in sewage treatment plants, atmospheric oxygen is introduced into the wastewater by means of a suitable gassing device. The technical effort to hold the aerator and the air supply should be minimal, the entire gassing device should be easy to install and easy to maintain in operation and repair if necessary. The operation of a sewage treatment plant also places high demands on the safety and reliability of the gassing device against failure, because if e.g. For example, in a sewage treatment plant, where the aerators fail due to clogging and are not repaired quickly, oxygen depletion occurs, the bacteria die, and it can take weeks for them to regrow.

In the prior art, so-called membrane aerators are known, in which a support body is surrounded by a perforated membrane, wherein the in the

Fluid to be introduced gas is introduced into the aerator between the support body and the membrane and the gas then exits the perforated membrane in the fluid. The support body serves in addition to holding the membrane at the same time to weight the aerator, so that the aerator advantageously decreases in the bottom region of the wastewater basin, so that the escaping gas has a long residence time in the wastewater. Since the membrane at

Introducing gas in the aerator can easily inflate and the so formed between the support body and membrane bubble increases the buoyancy of the aerator, the buoyancy of the aerator depends very much on the gassing device acting on the gas pressure. To counteract the buoyancy alone by the weight of the support body, is not useful for reasons of construction costs and handling. The

Weight of the aerator should therefore not be too large, as in assembly and repairs - which usually happens during operation, or full basin - large weights are very cumbersome.

It is an object of the invention to provide an economical fumigation apparatus that is easy to install, easy to maintain in operation, and that provides a robust means of resisting damage due to harsh operation in a wastewater treatment plant.

This object is achieved by a gassing device according to claim 1. Advantageous embodiments will become apparent from the dependent claims.

The core idea of the invention is to keep the ventilator unit of an enclosing frame, with which the ventilator unit is protected from damage and largely prevented from clogging by settling of particles or by contacting the floor. By means of the frame is further ensured that a lateral abutment of separate ventilation units is prevented. Since the membranes are sometimes only 0.1 mm thick, they are mechanically very sensitive, so that a collision between two aerators often leads to the destruction of the membranes. The at least one ventilator unit is connected to the frame, which for this purpose has a hollow connection space for passing the gas to be supplied through the frame into the ventilator unit. The frame may comprise a plurality of ventilator units connected by the hollow connection space of the frame. The distance of

Belüftereinheiten each other is to be chosen so that fluid flows and fluid turbulence do not cause that small bubbles are swirled into larger bubbles. The type of connection of the ventilation units according to the invention in one frame takes into account that only a few individual parts are required for constructing a unit. A modular

Construction allows the use of a small number of type parts.

The arrangement of the aerator units in the frame also leads to the generation of a possible laminar inflow from the ground, the rising from bottom to top laminar flow also above the

Belüftereinheiten is maintained. This, in turn, prevents small bubbles from merging into larger ones, which would be disadvantageously promoted in turbulent flows. The upward rising laminar flow also causes an advantageous water supply to the aerators, with which a sludge lift from the ground is supported.

If a plurality of ventilator units are provided as a type of battery in a gassing device, the frame advantageously has a hollow profile with a single connection space for a plurality of ventilator units to be arranged parallel to one another on the frame. Are several of these

Provided connection points on the hollow profile, the distance between two ventilation units to each other by omitting an intermediate enlarged optional Belüftereinheit be increased. The intermediate "free" connection point for the optional ventilator unit is then blocked, for example by means of a screw cap or sealing plug.

According to a further advantageous embodiment, it is provided that in

If several ventilation units these are clamped between two parallel opposite hollow sections. The hollow sections form part of the frame enclosing the ventilator units. It should be noted that in an arrangement with two opposing hollow sections, both must not be exposed to air to the gas / air inlet into the

Complete the fan unit (s). The not acted upon with an air supply side can then act as a simple open rectangular tube for receiving the Belüfterrohrenden what weight-saving and buoyancy-reducing effect.

To close the frame between said two hollow profiles side cheeks are provided in an advantageous manner, which then form the enclosing frame with the opposite hollow profiles. It is advantageous to provide a detachable connection between each one hand, the hollow section and on the other hand, the side cheek, so that the

Frame can be easily assembled and disassembled. Advantageously, a plug-in screw connection is realized here, by means of which the side cheek is attached at its end to the end of the hollow profile and then fixed for example by means of a cap nut on the plug-in bolt. The bolt may be welded to the hollow profile.

Such a plug-in screw connection has the advantage that cheeks on both sides can be replaced in a simple manner, according to a advantageous embodiment, different, massive side walls with different weights or even a plurality of thin side walls can be fixed to the hollow sections, so that the buoyancy of the gassing can be adjusted by the choice of a suitably heavy side cheek or the number of side cheeks. With others

Words is provided in an advantageous manner to provide different heavy side walls for replacement or more equal side walls for joining together in order to regulate the depth of the ventilator unit in response to a different injection quantity and a different buoyancy of the ventilator unit. Thinner side cheeks can be profiled to improve their stiffness.

According to a further advantageous embodiment, the side cheeks are dimensioned such that even when the frame of the gassing device is placed on the ground, it is clamped in the frame

Aerator units do not touch the ground. In other words, the side cheeks then form the feet of the gassing device and keep the ventilator units at a suitable distance from the ground. By preventing Kontactierens the ventilator units with the bottom of, for example, the wastewater tank is the risk of clogging the

Aerator membrane minimized by particles on the ground. Nevertheless, further ventilation of a floor standing ventilator unit is reliably ensured.

The clogging of the ventilator unit (s) will also be according to an advantageous

Embodiment characterized in that means are provided, with which the frame pivots about an axis lying in the plane of the frame. is held in cash. Since the gas to be introduced always exits at the top of the ventilator unit, the outlet area on the ventilator unit can be changed by pivoting the frame. If the frame is therefore pivoted through 180 °, the former underside of the fan unit now forms the new upper side, where the gas escapes. Such a

Changing the ventilation side by pivoting the frame can be provided manually or by means of drive. The pivoting can also be automated, such that pivoting of the frame is carried out by means of the drive after the expiration of fixed time periods. Finally, a self-enforcing automatic change of position of the frame by controlling the injection is possible, so that in this case can be dispensed with a special drive. To rotate the aerator is raised because he would otherwise not have enough space for the rotational movement. When turning, the aerators that are just "up" are heavily pressurized with air, which leads to self-cleaning.

Advantageously, a ventilator unit comprises a support body with a membrane spanning this, wherein the gas supply takes place between the support body and the membrane. The support body is connected to the hollow section of the aerator frame and it has a leading away from the terminal compartment a

Line on, through which the gas flows between the support body and membrane and then exits through the membrane evenly.

In an advantageous embodiment, the supporting body of the membrane is a tubular body having on its surface a notch, along which the gas introduced at the tubular body can flow from the beginning of the tubular body to its end. The membrane spanning the tube body is inflated by the incoming gas only when the gas has reached the end of the tubular body and subsequently increases the gas pressure in the notch. It is also advantageous if the membrane located above the notch has no perforation at this point for a gas outlet. When switching off the air supply, the membrane then immediately sets at this unperforated point on the support tube above the notch - or it is pressed by the external pressure on it, so check valve-like escape of air is prevented and thus neither mud nor sewage can get under the membrane, which could otherwise lead to blockages. The same

The non-return flap effect is achieved by omitting the perforation above the air inlet to the membrane space.

By appropriate design of the side cheeks can be achieved by this also a flow stabilizing effect.

The invention will now be explained in more detail with reference to the accompanying drawings, in which

FIG. 1 shows the gassing device according to the invention in a plan view with a partially sectioned cross section; FIG.

- Fig. 2 the support body of the ventilator unit with connection space on a

Hollow profile shows;

FIG. 3 shows a hollow profile in partial section, and FIG. 4 shows an embodiment with a pivotable frame. Fig. 1 shows the gasification device according to the invention in a plan view with a total of four parallel arranged Belüftereinheiten 10. The left side shown in the figure two Belüftereinheiten 10 are supplied by an upper hollow section 16 with gas, whereas the two right-side Belüftereinheiten 10 through the lower hollow section 16 with Gas to be supplied. For transferring the gas through the cavities support bodies 14 are provided at the respective connection points of the ventilation units (see detail Fig. 2), with which the gas from the hollow section 16 is continued by a line of the support body between the support body and membrane. The gassing device shown in Fig. 1 in its plan view is acted upon from above the plane of the drawing with the hollow sections 16 on hose nozzles (see detail Fig. 3) connected gas lines with gas. The type of association of the ventilator units according to the invention in one frame takes into account that only a few individual parts are required for the construction of a unit - in the present case shown, these are eight individual parts. A modular design allows the use of a small number of type parts - here three type parts.

The hollow sections 16 form with the side cheeks 20 arranged on both sides of the profiles a frame 12 enclosing the ventilator units 10.

The side cheeks are fixed with a plug-in screw connection, wherein at the respective ends of the hollow profile 16 an outwardly projecting

Bolt is provided, on which the side cheeks 20 are each plugged and subsequently fixed with a cap nut by screwing. The side cheeks are solid and are advantageously made of metal. By dimensioning the side cheeks, the weight of the gassing device can be chosen so that the buoyancy of the gassing device is suitably compensated or regulated. A replacement of the side wall is well possible by the quick plug-in screw connection. The frame enclosing the ventilator unit (s) provides optimum protection against collision with the venting unit (s) of an adjacent fumigation apparatus. A coincidence of two gassing devices can happen in that the gassing devices are set in migratory motion by the gas exiting the aerator units.

FIG. 2 shows the detail of a supporting body 14 for the gas connection point of a hollow profile 16 (not shown in FIG. 2). As shown in FIG. 2, the support body 14 is connected on the right side to the connection space 18 on a hollow profile, so that the gas is guided through the pipeline from the connection space 18 to the cylindrical outer circumference of the support body 14. Around the support body 14, the membrane (not shown here) is held on its outer circumference, so that the gas emerging on the outer circumference of the support body 14 flows in between the support body and the membrane and exits through the membrane in a uniform manner. If the ventilator unit 10 is to be supplied with gas from both sides, a supporting body would have to be provided on both sides. In contrast, a single ventilator unit normally has a single connecting device for supplying gas, so that a connecting space to the respective hollow profile per ventilator unit is also provided

Passing the gas through the support body is provided only at just this connection space 18. As shown in FIG Corresponding to this, the upper hollow section 16 has two left-sided connection points for two ventilation units and also the hollow connection space for the ventilation units is present only on the left side, whereas the right-side ventilation units are merely inserted in the upper hollow profile and no sealing device for preventing gas leakage must be provided here.

Fig. 3 shows the hollow profile 16 according to the invention with right-side sectional view. The gas supply hose (not shown) is fixed to the hose nozzle projecting upwards, so that the gassing device suspended in the waste water can be supplied with gas. In the right-side sectional view, two connection spaces 18 for connecting two ventilator units 10 are shown. At the respective ends of the hollow section 16, the plug-in bolts for fixing the side cheeks are clearly shown. In the illustration shown it can be seen that in the case of ground contact of the frame, the ventilator units themselves do not touch the ground.

Instead of a four aerator units 10 comprehensive fumigation, this may also include more or less ventilator units. If several ventilation units are provided, the length of a hollow profile should be dimensioned accordingly with provision of further connection spaces.

Fig. 4 shows an embodiment of the invention with pivotable

Frame. For this purpose, the hose nozzles of the hollow profile are arranged laterally directed outward and provided with a hinge. It should be noted that an air supply must not take place in both hollow sections. If the air is applied to only one side of a single hollow profile, only a rotary joint is provided on the unbound side.

REFERENCE LIST;

10 ventilator unit

12 enclosing frame 14 supporting body for gas connection point

16 hollow profile

18 connection room

20 side cheek

Claims

claims 1. gassing device for introducing gas into liquids, in particular of compressed air in waste water, with at least one elongated ventilator unit (10), at the end face of which the gas can be introduced and at whose periphery the gas can escape into the liquid, characterized in that the ventilator unit (10) is held by a frame (12) enclosing this unit (s) and hollowing at the frame at a connection point of the ventilator unit (10) to the frame Connection space (18) for the passage of the gas to be supplied through the frame (12) in the ventilator unit (10). 2. fumigation device according to claim 1, characterized in that the frame (12) at least one hollow profile (16) with a single terminal compartment (18) for a plurality of parallel to each other to be arranged on the frame ventilation units (10), wherein the hollow profile (16) has means for connecting a gas supply line. 3. Fumigation device according to claim 2, characterized in that a plurality of ventilation units (10) are clamped between two mutually parallel hollow profiles (16). 4. Fumigation device according to claim 3, characterized in that the two opposite hollow profiles (16) at the respective ends releasable fastening means, on which perpendicular to the hollow profiles to be arranged side cheeks (20) can be fixed, so that the two hollow profiles (16) fixed thereto two Side cheeks (20) a rectangular, the ventilator units (10) enclosing said frame. 5. fumigation device according to claim 4, characterized in that the two perpendicular to the hollow profiles (16) fixable side cheeks (20) are solid support elements, the weight of which is greater than the buoyancy of the gassing device. 6. Fumigation device according to claim 3 or 4, characterized in that the two perpendicular to the hollow profiles (16) fixable side cheeks (20) are dimensioned in size so that the lying in a plane ventilator units (10) not over the outer edge of the side cheeks (20) protrude. 7. fumigation device according to any preceding claim, characterized in that means are provided, with which the frame (12) on the / the gas supply lines to an axis lying in the plane of the frame axis by at least 180 ° is pivotable. 8. fumigation device according to any preceding claim, characterized in that the at least one ventilator unit (10) has a support body (14) with a membrane spanning this, wherein the gas supply takes place between the support body and the membrane. 9. Fumigation device according to claim 8, characterized in that the supporting body (14) comprises a gas line, by means of the near-axis on its front side entering gas to the outer surface of the support body (14) is passed, so that the gas flows between the support body and membrane and emerges uniformly through the membrane. 10. Fumigation device according to one of claims 4 to 9, characterized in that means for inserting the sides cheeks to the Hollow sections are provided.