EP3058145B1 - Sewage pumping station - Google Patents

Description

The invention relates to a wastewater lifting plant, with at least one bulky material collecting container for wastewater guided therewith and loaded with bulky substances, furthermore with a liquid collecting container for the wastewater freed from bulking substances and pre-cleaned in the bulky material collecting container, and with a sewage shaft for receiving at least the bulky material Collection container and the liquid collection container, wherein the liquid collection container is designed as an integral part of the sewage shaft and for this purpose the liquid collection container and the sewage shaft have at least one common material-uniform wall surface, that is, the liquid collection container uses the common wall surface with the sewage shaft and doesn't have its own wall in this area.

As is known, wastewater lifting plants are typically used to lift wastewater collected at the end of a wastewater storage space to a certain level. After that, further treatment is usually carried out in a wastewater treatment plant. In the past and in the state of the art, wastewater lifting is often carried out with large pumps, which, however, cannot convince in terms of efficiency.

For this reason, the generic teaching according to the EP 1 108 822 A1 a wastewater lifting plant in which raw solids or solids are separated from the pumped medium, usually the wastewater, before it enters an inserted pump. A barrier material collection container upstream of the pump ensures the separation described. The bulky materials are ideally retained in the bulky material collecting container, so that only pre-cleaned waste water is transferred to a liquid collecting container downstream of the bulky material collecting container. The in practice Sewage lifting plants used are typically received and placed in a concrete sewage shaft. As part of the generic EP 1 108 822 A1 In addition, the possibility is described that the liquid collecting container and the sewage shaft receiving the sewage lifting plant are made of plastic. The bottom of the manhole also forms the bottom of the liquid collecting container.

The generic type is similar DE 295 05 028 U1 in front. Here, a middle wall in the sewage shaft and part of the shaft wall form the liquid collecting container. The shaft wall and the middle wall or all other walls are made of plastic in the sense of a constructional composite. This should save costs and installation space.

The known measures cannot convince all around. Because a sewage shaft made of concrete, for example, first has to be founded and built on site. Subsequently, the wastewater lifting plant is usually installed. In practice, one usually falls back on a liquid collecting container, which is made of metal or plastic. This liquid collection container is designed separately from the sewage shaft and is accommodated in the sewage shaft in question.

When teaching according to the EP 1 108 822 A1 the liquid collecting container and the waste water shaft are made of plastic, the bottom of the shaft simultaneously forming the bottom of the liquid collecting container. This limits the installation location of the liquid collection container in the sewage shaft. In addition, no additional installation space is available on the floor. However, the choice of material (plastic) is more important. Plastic sewers can be prefabricated industrially. This results in cost advantages (cf. DE 295 05 028 U1 ). However, such structures Often the static and dynamic loads at the place of installation are not always or not always permanent. The invention as a whole aims to remedy this.

The invention is based on the technical problem of further developing such a sewage lifting plant in such a way that permanent operation is ensured and at the same time cost advantages in production are observed.

To solve this technical problem, a generic wastewater lifting plant is designed within the scope of the invention in accordance with the features of the characterizing part of independent claim 1.

Within the scope of the invention, a liquid collecting container is first of all realized, which defines a closed space in the sewage shaft, that is to say has a floor, side walls and a cover on the head side. Since the liquid collecting container in question only partially covers the floor area in the sewage shaft or the sewage shaft, an installation space or a free space for installations is available on the remaining bottom surface of the waste water shaft not occupied by the liquid collecting container. This installation space or free space can be used, for example, for the attachment of one or more pumps there. The pump in question is the bulk container assigned and serves for emptying the liquid collection container via the bulky material collection container in question. In any case, the pump in question (possibly in conjunction with other elements of the sewage lifting unit) can be attached and placed dry, as it were, in the space mentioned above, which is available in the sewage shaft because the liquid collecting container only partially covers the bottom surface of the sewage shaft, i.e. not Completely. In this way, not only is the installation of the one or more pumps easier, but also maintenance of the pump can be implemented and implemented during operation. In the same way, the available installation space or free space can also be used for attaching and placing a distributor housing or a distributor, which leads and directs the waste water contaminated with the barrier substances to the barrier substance collecting container. Coarse solid components can be separated from the waste water in the distributor housing.

In any case, there is the possibility within the scope of the invention to accommodate the distributor housing in the above-mentioned free space, so that installation and maintenance as well as accessibility are facilitated. The same applies to the bulky waste container. In this context, it should be emphasized that the free space is not only realized, as it were, next to the liquid collecting container on the bottom surface of the sewage shaft that is not covered by the liquid collecting container. Instead, the free space can also extend further above the top cover of the liquid collecting container in the sewage shaft. As a result, a particularly compact construction and in particular a reduced shaft diameter are observed.

In this context, the invention further provides that the cover at the head end is designed to be removable. This simplifies any maintenance work. Due to the different materials Designing the cover or the wall surface independent of the sewage shaft in comparison to the sewage shaft makes it possible to design the sewage shaft solidly from, for example, concrete, whereas the wall surfaces of the liquid collecting container that are independent of the sewage shaft can typically be made of plastic or metal. This mix of materials combines a significant stability of the sewage shaft and the liquid collecting container with special cost advantages.

In addition, the liquid collection container can be equipped with an inspection opening, which can be removed or opened for maintenance purposes or for checking the liquid collection container. In this way, the liquid collection container can be checked and cleaned if necessary.

The sewage shaft and / or the liquid container preferably have a coating.

In addition, the invention recommends that the liquid collecting container is designed to be tight and in particular gas-tight, in order to retain any fermentation gases that may arise. In order that an overpressure does not arise in the liquid collecting container in this context, the invention further recommends to equip the liquid collecting container with a vent.

Should a flood of the liquid collecting container or the sewage shaft as a whole be observed, an additional sump pump ensures that the sewage shaft can be emptied with its help. This sump pump is regularly placed in the above-mentioned free space or installation space on the bottom surface of the sewage shaft that is not covered by the liquid collecting container. In addition, it is recommended that the liquid collection container be equipped with at least one inclined surface to reduce deposits becomes. In fact, there are still suspended matter in the pre-cleaned wastewater, which is collected and collected in the liquid collecting container, which can lead to deposits inside the liquid collecting container. In the context of the invention, these suspended matter are now guided along the inclined surface to reduce deposits down to the deepest part of the container, from where they can be sucked in by the pump. This deepest container typically coincides with a suction area captured by the pump, so that any deposits can be conveyed directly into the pump inlet, here sucked in by the pump and finally discharged via the bulk material collecting container. As a result, any maintenance and cleaning work on the liquid collection container is reduced to a minimum.

The inventive design of the liquid collection container as a closed space with only partial coverage of the floor area in the sewage shaft also opens up the possibility of the bulky material collection container as well as the optional pump and possibly the distributor or the distributor housing (in each case) inside, partly inside or outside the liquid collection container to be arranged in the sewage shaft. As a rule and for reasons of simple maintenance, the aforementioned components will typically be placed outside the liquid collection container in order to keep them easily accessible. In principle, however, there is also the possibility of integrating some or all of the aforementioned components partially or completely into the liquid collection container in order to implement a particularly compact structure. Such a compact structure is, however, already provided according to the invention by the basic construction, because the liquid collecting container and the sewage shaft have at least one common wall surface. This common wall surface can be a side wall surface and / or a floor surface. In contrast there is one Common ceiling surface of the liquid collecting container and sewage shaft is not regularly realized, although not excluded within the scope of the invention.

In order to be able to implement this in detail, the common wall surface of the liquid collecting container and the sewage shaft are constructed according to the invention using the same material. This means that in this case the liquid collection container uses the common wall surface with the sewage shaft and does not have its own wall in this area. This achieves special cost advantages because the wall of the liquid collecting container in question is dispensable and consequently does not have to be manufactured or assembled.

Alternatively or additionally, in the context of a variant not according to the invention, the common wall surface of the liquid collecting container and the sewage shaft can also consist of two interconnected materials. In this case, the wall of the liquid collecting container on the one hand and the wall of the sewage shaft on the other hand are each designed separately from one another, but are connected to one another. As a result, for example, the wall of the sewage shaft can also be used to support the wall of the liquid collecting container and stabilize it.

Finally, another option that is not in accordance with the invention is the option that the common wall surface of the liquid collecting container and that of the sewage shaft act as a lost shape. This means that in this case the wall of the liquid collecting container, which also represents the wall of the sewage shaft, is typically used as a mold in the production of the liquid collecting container or the corresponding wall is left blank. For example, it may be the liquid collection container is a plastic container that is produced in an injection mold. In this case, the common wall surface with the sewage shaft acts as a lost form. Said common wall surface therefore does not necessarily have to be taken into account in the production.

In the end, it was recommended that the liquid collection container and the sewage shaft be made of concrete, metal, plastic and combinations. A different material is used in the area of the wall surface of the liquid collection container, which is independent of the sewage shaft, than that of the waste water shaft. In the simplest case, the liquid collecting container can, for example, be implemented and implemented in the inside of the sewage shaft (made of concrete) in such a way that an additional wall (made of concrete) is drawn into the sewage shaft and closed with a cover on the top made of plastic or metal, for example. In any case, the sewage lifting plant according to the invention is particularly compact and inexpensive, and offers advantages in maintenance and cleaning. This is where the main advantages can be seen.

Fig. 1

eine Gesamtansicht einer Abwasserhebeanlage, teilweise im Schnitt,

Fig. 2

einen Schnitt durch den Gegenstand nach der Fig. 1,

Fig. 3

ebenfalls einen Schnitt durch eine erfindungsgemäße Abwasserhebeanlage in einer Variante, und

Fig. 4

eine weitere Abwandlung mit angedeutetem Flüssigkeits-Sammelbehälter.

The invention is explained in more detail below with reference to the following drawings; show it:

Fig. 1

an overall view of a sewage lifting plant, partly in section,

Fig. 2

a section through the object after the Fig. 1 ,

Fig. 3

also a section through a sewage lifting plant according to the invention in a variant, and

Fig. 4

a further modification with the indicated liquid collecting container.

In the figures, a sewage lifting plant 1 is shown, which is received in a sewage shaft 8. The basic construction of the wastewater lifting plant 1 has a bulky material collecting container 2 or according to the exemplary embodiment in FIG Fig. 1 via two bulky material collecting containers 2 and a liquid collecting container 3. In addition, at least one pump 4 is also realized or, in the exemplary embodiment, there are two pumps 4.

Furthermore, one can still see a distributor or a distributor housing 5, with the aid of which wastewater which is fed in and contaminated with bulky substances is conducted to the two bulky containers 2. For this purpose, the distributor 5 is connected to an inlet 6 for the waste water.

With the help of the two bulky waste containers 2, the wastewater fed through the distributor 5 and contaminated with bulky substances is pre-cleaned. For this purpose, 2 sieves or the like are provided in the bulky container in question. The distributor 5 may also be equipped with a type of sieve, in the present case a rake for coarse solid components in the wastewater, but this is not mandatory. The wastewater, which has been freed from the barrier substances and pre-cleaned, then arrives at the barrier substance collecting container 2 in the liquid collecting container 3 for the pre-cleaned waste water.

In this process, the pre-cleaned waste water flows against the direction of conveyance through the respective pump 4 and then into the liquid collecting container 3. Here, a non-return valve, not shown, is closed in or on the bulky substance collecting container 2, so that any inflow is blocked by waste water from the distributor 5. In the present case, the pumps 4 run in mutual operation in order to enable an unimpeded inflow to the liquid collecting container 3 in this context.

As soon as the liquid level in the liquid collecting container 3 has reached or exceeded a certain level, one of the pumps 4 is put into operation. Then the pump 4 sucks the pre-cleaned wastewater from the liquid collecting container 3 and transfers it to the associated bulky substance collecting container 2. This flow process closes the check valve mentioned and the solids previously retained in the bulky substance collecting container 2 are lifted with the wastewater and dissipated. For this purpose, a pressure line 7 is available on the output side. Further details on the mode of operation are initially in the already referenced EP 1 108 822 A1 described.

Of particular importance to the invention is the fact that the liquid collecting container 3 is designed as an integral part of a sewage shaft 8. In fact, the wastewater shaft 8 serves to hold the bulky material collecting container or the two bulky material collecting container 2 and also the liquid collecting container 3. In addition, in the exemplary embodiment, the already described distributor 5 and the two pumps 4 are also accommodated inside the wastewater shaft 8. The overall design is such that the liquid collecting container 3 and the sewage shaft 8 have at least one common wall surface 9, 10.

In the context of the exemplary embodiments shown, the common wall surface 9, 10 of the sewage shaft 8 on the one hand and the liquid collecting container 3 on the other is a bottom surface 9 and a side wall surface 10. The bottom surface 9 and the side wall surface 10 are like the entire sewage shaft 8 - made of concrete. In addition, the design is such that the liquid collection container 3 defines an enclosed space in the sewage shaft 8. In addition, the liquid collecting container 3 only partially covers the floor surface 9 in question in the sewage shaft 8, as in particular the sectional representations in FIGS 2 to 4 make clear.

It can be seen here that the bottom surface 9 in the sewage shaft 8 is divided, so to speak, with a partial bottom surface 9a that is not covered by the liquid collecting container 3 and a further partial bottom surface 9b that belongs to the liquid collecting container 3 or is covered by the latter. The partial floor area 9a free or not covered by the collecting container 3 defines a free space or installation space. In this exemplary embodiment, the two pumps 4 are arranged on the bottom of the sewage shaft 8 in this free space or installation space above the partial floor surface 9a. In addition, the two bulky material collecting containers 2 and also the distributor 5 are located in the relevant free space, which also widens above a removable cover 11 of the liquid collecting container 3. In fact, the liquid collecting container 3 not only has the aforementioned common wall surface 9, 10 with the sewage shaft 8, but is also equipped with independent wall surfaces 11 and 11, 12 from the sewage shaft 8.

These independent wall surfaces 11, 12 are on the one hand the already mentioned removable and head-side cover 11 for the liquid collecting container 3 and on the other hand one or more side walls 12. Within the framework of the construction according to the invention Fig. 2 the side wall 12 there is directly defined in the sewage shaft 8 and may, for example, like the sewage shaft 8, be made of concrete with a uniform material, in order to provide a particularly durable and pressure-resistant construction put. Here, only the wall surface 11 or cover 11 is independent of the sewage shaft 8 and made of metal, that is to say from different materials.

In the variant after the Fig. 3 and also as part of the Fig. 4 represent the wall surfaces 11, 12, which are independent of the sewage shaft 8, components of the plastic liquid container 3 inserted and usable in the sewage shaft 8. In this case, the sewage shaft 8 may function as a kind of lost form. That is, to define the liquid collecting container 3 inside the sewage shaft 8, it is only necessary to manufacture the removable cover 11 in connection with the side walls 12 outside and to use the common wall surfaces 9, 10 of the sewage shaft 8. In this case, the liquid collection container 3 is designed as it were open and uses the common wall surface 9, 10 as a lost shape or to complete it, so that a closed design of the liquid collection container 3 is achieved overall.

The common wall surfaces 9, 10 of the liquid collecting container 3 and the sewage shaft 8 are made of the same material, as is the case in the variant according to FIGS Fig. 2 and 3rd is shown. In this case, the wall surface 9, 10 of the sewage shaft 8 (made of concrete) also functions as a wall surface 9, 10 for the liquid collecting container 3, the remaining wall surfaces 11, 12 of which can be made, for example, of plastic or metal or combinations.

In the variant after the Fig. 4 are the common wall surface 9, 10 of the sewage shaft 8 and that of the liquid collecting container 3 made of two interconnected materials. In this case, the sewage shaft 8 functions as a support or support for the separately existing wall surfaces 9, 10 of the liquid collection container 3. Using the variant in the Fig. 3 it can be seen that the removable cover 11 of the liquid collecting container 3 can be equipped with an inspection opening 13. The liquid collecting container 3 can be checked and, if necessary, cleaned via this inspection opening 13. Another option is in the Fig. 1 In addition to the inspection opening 13, a vent 14 for the liquid collecting container 3 is shown. With the help of this vent 14 it is avoided that any overpressure occurs in the liquid collecting container 3.

In fact, within the scope of the exemplary embodiment, the liquid collecting container 3 is designed to be leak-proof and in particular gas-tight, so that any digester gases that arise inside must be removed. The vent 14 is used for this.

In the Fig. 1 Another pump 4 'can be seen, which in the present case is designed as a sump pump and is used to pump any liquid collected in the sewage shaft 8 during a flooding and to remove it from the sewage shaft 8.

As part of the Fig. 2 the possibility is also shown to equip the liquid collecting container 3 with an inside coating 15. In the present case, this coating 15 is found in the area of the wall surfaces or walls 9, 10, 12, which in this illustration are each made of concrete. So that no liquid can escape from the liquid collecting container 3 through the concrete, the coating 15 in question is provided, which can be designed, for example, as a plastic coating. As part of the variant according to the Fig. 3 one recognizes an inclined surface 16 as part of the liquid collecting container 3. With the help of this inclined surface 16 it is prevented that inside the liquid collecting container Can form deposits. For this purpose, the inclined surface 16 in question is arranged in such a way that the deposits are conveyed along the inclined surface 16 into an inlet 17 for the pump 4, from where they are properly sucked in by the pump 4 and ultimately discharged via the pressure line 7.

Finally, the embodiment of the Fig. 4 yet another variant in such a way that a sole of the bulky substance collecting container 2 and a pressure line 18 of the pump 4 are arranged at approximately the same height. In the exemplary embodiment, the pressure line 18 is an intermediate piece between the pump 4 and the bulky material collecting container 2. In any case, the roughly identical arrangement of the pressure line 18 of the pump 4 and the bulky material collecting container 2 leads overall to that in the bulky material Solids container 2 retained solids can be removed particularly effectively from a separating sieve usually provided there when the pump 4 sucks the pre-cleaned waste water out of the liquid collecting container 3 and conveys it to the pressure line 7 together with the solids retained there via the bulky substance collecting container 2. This variant after the Fig. 4 is also characterized in that a particularly low overall height is observed and the construction of the sewage lifting plant according to the invention is not only compact, but is also connected to a shallow depth or shaft height of the sewage shaft 8.

Claims (7)

1. Wastewater pumping station (1), having at least one solids collecting tank (2) for wastewater which is guided through the same and is loaded with solids, additionally having a liquid collecting tank (3) for the wastewater which has been rid of solids and has been pretreated in the solids collecting tank (2), and having a wastewater shaft (8) for receiving at least the solids collecting tank (2) and the liquid collecting tank (3), wherein

   - the liquid collecting tank (3) is realized, so to speak, as a fixed component part of the wastewater shaft (8) and for this purpose

   - the liquid collecting tank (3) and the wastewater shaft (8) have at least one common wall surface (9, 10) of uniform material, that is to say that the liquid collecting tank (3) utilizes the common wall surface (9, 10) with the wastewater shaft (8) and does not have its own wall in said region,

   - the liquid collecting tank (3) defines a closed chamber in the wastewater shaft (8) with an only partially covered bottom surface (9), wherein the bottom surface in the wastewater shaft (8) is, as it were, divided into two with a part bottom surface (9a) which is not covered by the liquid collecting tank (3) and thereby defines an installation area, and a further part bottom surface (9b) which is associated with the liquid collecting tank (3) or is covered by said liquid collecting tank,

   characterized in that
   the liquid collecting tank (3) is provided with at least one wall surface (11, 12), which is independent of the wastewater shaft (8) and of different material, in the form of a removable head-end cover (11) for the liquid collecting tank (3) and in the form of one or more side walls (12).
2. Wastewater pumping station (1) according to Claim 1, characterized in that the liquid collecting tank (3) is provided with an inspection opening (13).
3. Wastewater pumping station (1) according to either of Claims 1 and 2, characterized in that the wastewater shaft (8) and/or the liquid collecting tank (3) comprise/comprises a coating (15).
4. Wastewater pumping station (1) according to one of Claims 1 to 3, characterized in that the liquid collecting tank (3) is realized in a gas-tight manner.
5. Wastewater pumping station (1) according to one of Claims 1 to 4, characterized in that the liquid collecting tank (3) comprises a vent (14).
6. Wastewater pumping station (1) according to one of Claims 1 to 5, characterized in that the liquid collecting tank (3) is provided with at least one oblique surface (16) for reducing deposits.
7. Wastewater pumping station (1) according to one of Claims 1 to 6, characterized in that the solids collecting tank (2) as well as an optional pump (4) and, where applicable, a distributor (5) are arranged inside, partially inside or outside the liquid collecting tank (3) in the wastewater shaft (8).

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