EP1108822A1 - Sewage lifting plant - Google Patents

Abstract

The pumping station has a holding tank (4) for solids-containing waste water, a holding tank for partially cleaned waste water, and a pump (6) to drain the second tank via the first one. The first holding tank contains a grading screen (9), e.g. a horizontal or a curved screen, to keep the solids away from the pump. It divides the first holding tank in longitudinal direction into a section (4a) containing water with solids, and a section (4b) for solids-free water. The second section is connected to the pump via a bypass (5). The water holding tank and a shaft (1) containing the pumping station, are pref. of plastic.

Description

The invention relates to a sewage lifting plant, with at least a bulky waste container for this and contaminated with bulky or coarse solids Waste water, furthermore with a liquid collecting container for the freed of bulky substances and in the bulky material container pre-cleaned wastewater, and with at least one the pump associated with the bulky material collection container for emptying of the liquid collecting container via the bulky substance collecting container.

Wastewater lifting plants are usually used at the ends of a wastewater storage space to a specific one To raise the level, for example for further treatment in a wastewater treatment plant. In the past do you have sewage lifting etc. made with big pumps, which however are not convincing in terms of efficiency can. Consequently, the above-mentioned wastewater lifting plants on the principle of separation of coarse solids or solids from the medium, as a rule the wastewater, worked before this medium into the used pump enters. The bulky or coarse solids get into the upstream of the pump Bulky material collection container. Ideally, they remain Bulky substances in this bulky material container so that only pre-cleaned wastewater in the bulk container downstream liquid collection container is transferred.

This pre-cleaned wastewater can either through the Pump into the liquid collection container or via a Bypass get into this (see. DE 196 50 625 Cl). The restraint the solids in the bulk container takes place in the known teaching in that within the Bulky material collection flaps are provided.

In addition, each bulky material collection room or Bulky material collection container is used as a shut-off device Swimming ball. This ensures that when switched on Pump and pumped out of the liquid collection container pre-cleaned wastewater in the bulky waste container not additionally waste water contaminated with solids through an inlet line into the bulky waste container reached. When the pump is switched off, the floating ball returns or the shut-off device, the relevant opening of the bulky material container to the supply line, of course, free the contaminated wastewater after pre-treatment using the Finally, partition flaps into the liquid collection container can reach.

This configuration is not free from defects. So assets the separating flaps as far as the retention of solids is concerned, not convincing in all points. Can also by Shut-off ball only then closes the inlet line be shown when the liquid level in the bulk container has reached a certain height. In addition, damage to this floating ball or Shut-off devices are the order of the day, so the way it works is affected. After all, every repair requires and / or maintenance in the state of the art the entire facility.

Other problems arise with a generic one Sewage lifting plant. So here is a blockage of the inflow in the bulky waste container during the conveying process by means of one or more expanding Hose bubbles or hose membranes accomplished. This may work slightly better than the swimming ball according to DE 196 50 625 C1, but is from constructive effort ago complex. - Here is the invention overall remedy.

The invention is based on the technical problem Wastewater lifting plant of the construction described above further educate that proper separation between wastewater contaminated with precursors and pre-treated wastewater succeed with a structurally simple structure.

To achieve this object, the invention proposes Generic wastewater lifting plant that the bulky container at least one separating sieve inside which keeps the bulky materials away from the pump. As a rule, this separating sieve is used as a horizontal or Curved sieve and can the bulky container in the longitudinal direction in a container area contaminated with bulky material and a container area free of impurities divide.

As a rule, the (lower) container area is free of bulky materials by means of a discharge designed as a bypass with the Pump connected, the bulky (upper) container area both to the pump and to a pressure line connected to the continuation of the raised wastewater is. Furthermore, the bulky container can be inside have a check valve, one - next to the Bypass drainage - additional connecting line to the pump with inflowing wastewater essentially closes.

In this way, the container area is loaded with bulky material of the bulky waste container with inflowing wastewater partitioned off because on one side the addressed one Check valve the connecting line to the pump closes and on the other side the pressure line is also cordoned off. The inflowing and with bulky materials contaminated wastewater can only be through the separating sieve and finally the derivation or the bypass from the Bulky material collection containers are discharged. Because here the separating sieve must necessarily be passed, the Bulky or coarse solids retained by this.

According to a proposal of the invention with independent meaning it is envisaged that the supply line already mentioned to the bulk container with a (own) Check valve is equipped. This supply line is the Bulky material collection container arranged upstream and ensures the feed of the wastewater contaminated with bulky substances. The aforementioned Non-return flap in the supply line opens at through the supply line flowing into the bulky container (contaminated) waste water and closes at through the Bulky material collection container by means of the pump in the pressure line extracted wastewater. This closing process of the The non-return flap is in the bulk container and thus pressure built up in the supply line Pump accomplished.

This non-return valve can be one in the supply line suspended at an angle to a horizontal Act round flap. This tendency ensures that even small overprints in the supply line for a perfect Care to open this check valve.

For example, sudden amounts of water To be able to master (driving rain) is the bulky material collection container an inlet distributor upstream, which one connected to the liquid collection container Has overflow. This overflow can with a rough or / Fine sieve to be equipped to solids in the Retain inlet manifold. Also attaching additional ones Sieves in this inlet manifold are, of course within the scope of the invention. These additional screens or separating screens can ensure, for example, that in a kind of pre-classification of the Solids in the wastewater takes place. So can Here, for example, particularly coarse components are retained become.

For maintenance and construction reasons, the are Inlet manifold, the bulky container and the Liquid collection containers as separate assemblies executed with the representation of a modular unit. In other words, feed distributors, bulky containers and own liquid storage tanks Housing can, therefore, separately maintenance and Repairs undergo without the facility as a whole must be shut down. This is possible because usually two bulky containers with associated pumps are realized alternately or can be operated together.

A particularly inexpensive variant of the invention provides before that the liquid storage tank and a the sewage lifting unit receiving sewage shaft from preferably Plastic are made, the shaft bottom of the Sewage shaft at the same time the bottom of the liquid collection container forms. Of course, this is Make use of other materials, for example Steel or concrete possible.

The bulky container is within the scope of the invention made of stainless steel and thus offers extremely high Downtimes. In addition, there is no fear of corrosion. The chemical resistance is also extremely high, so that even aggressive waste water and / or solids are flawless treated or withheld.

The design of the liquid collection container and the Sewage shaft made of plastic overall offers about it also the advantage of these containers as a whole to be able to monitor possible leaks. Such is basically described in detail in DE-OS 44 10 593. Reference is made to the statements there.

The container area of the Bulky solids retention container retained are - as described in German Patent 196 50 625 - carried into the pressure line, for the case that the pump is switched on. this happens then when a certain one in the liquid collecting container Level is reached.

As a result of the invention in the interior of the bulky container provided separating sieve will be a flawless Pre-treatment of the wastewater achieved. Because this separating sieve usually extends in the horizontal direction the entire length of the bulk container and has thus a relatively large surface area. In any case, this is significantly larger than that of the replaced Partition flaps according to DE 196 50 625.

Otherwise, the separating sieve makes it practically uniform Coating with coarse solids reached, so that individual material accumulations are not to be feared. The described screen area can be enlarged for the case that the separating sieve is designed as a curved sieve. The invention enables both a fixed installation of the separating sieve as well as an interchangeable design. Such offers itself because of the bulky container - in contrast to the teaching according to DE 196 50 625 - in is housed in its own housing, consequently corresponding Exchange and maintenance work is easy can. This possibility of replacement can of course also differently contaminated wastewater and / or regional peculiarities become.

It also allows in the supply line to the bulk material container provided check valve a flawless Closing the supply line from the pump to the Wastewater discharge pipe. This succeeds without much constructive effort. Malfunctions can also be excluded, like a swimming ball according to the state technology is always to be feared. Finally, you can with the help of the specially designed inlet distributor Overflow also handles large amounts of waste water per unit of time which are not the state of the art could cope with. Here are the main advantages to see the invention.

Fig. 1

eine Abwasserhebeanlage mit zwei SperrstoffSammelbehältern,

Fig. 2

eine Detailansicht des Gegenstandes nach Fig. 1 aus Richtung A,

Fig. 3

eine Seitenansicht des Gegenstandes nach Fig. 2 aus Richtung B,

Fig. 4

eine Ansicht auf den Sperrstoff-Sammelbehälter aus Richtung C gemäß der Fig. 1,

Fig. 5

eine Ansicht auf den Sperrstoff-Sammelbehälter aus der gegenüberliegenden Richtung D und

Fig. 6 und 7

die Rückschlagklappe in der Zuleitung zum Sperrstoff-Sammelbehälter im Schnitt (Fig. 6) und in Aufsicht (Fig. 7).

The invention is explained in more detail below on the basis of a drawing illustrating only one exemplary embodiment. Show it:

Fig. 1

a wastewater lifting plant with two bulky waste containers,

Fig. 2

1 from the direction A,

Fig. 3

2 from the direction B,

Fig. 4

2 shows a view of the bulky material collecting container from direction C according to FIG. 1,

Fig. 5

a view of the bulky container from the opposite direction D and

6 and 7

the non-return flap in the supply line to the bulk material container in section (Fig. 6) and in supervision (Fig. 7).

In Fig. 1 a sewage lifting plant is shown, namely in an unfolded along a line of symmetry S. Presentation. In other words, this is how as described in the figure description of DE 196 50 625 C1. Then the left and in practice assemblies located to the right of the line of symmetry S actually one above the other in the drawing plane.

The wastewater lifting plant shown is in a wastewater shaft 1 localized, preferably on the latter lowest point. This sewage shaft 1 can be made of plastic be made. Of course there are others too Materials such as concrete or steel are conceivable.

Belongs to the basic structure of the sewage lifting plant an inflow distributor 2, via which waste water in FIG. 1 is fed from the left. This wastewater is with Bulky or solid F loaded. From this inlet manifold 2, the wastewater reaches a feed line 3 in a bulk container 4. Here it is Wastewater freed from the bulky substances F in the bulky waste container 4 remain. In other words the wastewater is pre-cleaned here.

This pre-cleaned wastewater reaches a drain 5 into a pump 6, this derivation 5 being designed as a bypass 5 is. After passing the pump 6, the pre-cleaned flows Finally, waste water into a liquid collection container 7. This is possible because the pump 6 is a centrifugal pump that has a corresponding Cross section for the pre-treated wastewater to Provides. The pre-treatment of the wastewater in the bulk container 4 takes place by means of a separating sieve 9, which in the present case is designed as a curved screen 9 (cf. 4 and 5). A horizontal screen 9 'is also conceivable. To the embodiment is in the left part of FIG Feeding process of the wastewater contaminated with barrier substances F. shown while the right part is sewage lifting represents.

1, 2 and 3 show that two Bulky material collection container 4 with associated derivatives 5 5 and pumps 6 are provided, which each have two Feed lines 3 are fed from the inlet manifold 2. These supply lines 3 are in practice - as already said - in the drawing plane of FIG. 1 one above the other, so that in this way the in FIGS discerning topology. At each end of the Feed line 3 are provided separating sieves 8, which for a Coarse cleaning of the wastewater contaminated with barrier substances F. to care. Of course, these separating screens 8 can also be used to be dispensed with.

The pre-cleaned and in the usual way in the liquid collection container 7 collected waste water is treated according to the right Part of Fig. 1 with the help of the pump 6 via the derivative 5 and a connecting line 12 through the bulky container 4 transferred to a pressure line 10. At the end this pressure line 10 likes a wastewater treatment plant are located. It can be seen that during this wastewater lifting process the previously deposited in the bulk container 4 Bulky substances F are washed off the separating sieve 9 and fed to a further treatment via the pressure line 10 become. Because it is in the separating screen 9 inside the Bulky material collecting container 4 is a curved screen 9, succeeds in a particularly even and fine distribution the barrier materials F on this curved screen 9, with less Thickness of an associated barrier layer. Hence the barrier substances F during the subsequent pumping process easily detach from the separating sieve 9 so that it is practical be flushed into the pressure line 10 without resistance can. The functional sequence is now explained in detail.

When the waste water flows through the feed line 3 into the Bulky material collecting container 4 (arrows in the left part of FIG. 1) is a check valve 11 provided there inside closed, as the left part of FIG. 1 shows. This check valve 11 closes the Connection line 12 to the pump 6. Also the pressure line 10 is now locked. As a result, forms in the bulk container 4 a foreclosed, contaminated Container area 4a in the upper part and to the liquid collection container 7 open, non-bulky container area 4b in the lower part (see. Fig. 1 and 4 and 5).

The fact that the container area 4a is closed on the side and is loaded with barrier materials F. Waste water flows through the feed line 3, this is pushed through the separating sieve 9 and can over the Discharge or the bypass 5 - and only this - to the pump 6 flow out. Through this process, the previously with Bulky substances F contaminated wastewater cleaned because the coarse residues practically recorded by the separating screen 9 become. The pre-cleaned waste water flows through the pump 6 through into the liquid collecting container 7. This succeeds - As already stated - because this pump 6 in the context of the embodiment around a centrifugal pump acts, the required flow of the pre-cleaned Sewage enabled.

As soon as the liquid level in the liquid collecting container 7 has reached or exceeds a certain level, a pump 6 is normally put into operation by a so-called level control. Of course, both pumps 6 can work simultaneously. According to the exemplary embodiment, however, only the pump 6 shown in the right part of FIG. 1 is acted upon and sucks the pre-cleaned waste water out of the liquid collecting container 7 in the direction of flow indicated by arrows. It can be seen that the wastewater conveyed and pre-cleaned in this way reaches the barrier material collecting container 4 by means of the pump 6 both via the discharge line or the bypass 5 and the connecting line 12. The check valve 11 is opened by this flow process. At the same time, a further non-return valve 13 located in the feed line 3 closes, which was previously opened during the waste water supply process in the left part of FIG. 1.
This non-return flap 13 is shown in detail in FIGS. 6 and 7 and is designed as a round flap 13 suspended in the feed line 3 at an angle to a horizontal H (angle of inclination a; cf. FIG. 6). The inclination shown enables this check valve 13 to be opened easily when the waste water is fed in (cf. the arrows in the left part in FIG. 1 and in FIG. 6). If, on the other hand, the pre-cleaned wastewater is lifted, the non-return valve closes 13. Because of the lower pressure that results from the pumping action in the bulky substance collecting container 4 compared to the inlet distributor 2, the aforementioned non-return valve or circular valve 13 is moved into the closed position, as is shown in the right part 1 is shown. Consequently, during this conveying process, no waste water contaminated with barrier substances F can flow from the inlet distributor 2 via the feed line 3 into the barrier substance collecting container 4.

This enables the previously on the Separating sieve 9 detachable barrier substances F from this and from the bulky material collecting container 4 into the pressure line 10 be washed out. Of course you can instead of the mechanical closure described Check valve 13 also an electric or pneumatic Closure can be realized. Anyway all previously in the bulky container area 4a collected coarse solids or bulky solids F and the bulky material collecting container 4 washes away.

The inlet distributor 2 can be moved using a slide 14 close to a central inlet Z and has a built-in overflow 15. 2 is also indicated a stone trap 16, in which it can be a trough 16 in the simplest case. The Overflow 15 of the inlet distributor 2 is with a fine sieve equipped for coarse material separation and stands over an overflow pipe 17 with the liquid collection container 7 in Connection. This ensures that too large amounts of waste water per unit of time (e.g. downpour) bypassing the bulk container 4 and the Pumps 6 are supplied to the liquid collecting container 7 pre-cleaned can be.

In addition, the inlet manifold 2 has not shown Ventilation lines on, which for relaxation serve in the event of an accident like this is basically described in DE 196 50 625. So can possible overpressures in the pressure line 10 Remove the inlet distributor 2.

The inlet manifold 2, the bulky containers 4 and the liquid collection container 7 are separate from each other Assemblies or containers showing a modular unit and each have separate Housing on. So cleaning, repair, Maintenance or replacement of individual components independently possible from the other units. Through the closed Execution of the liquid collection container 7 Swimming blankets and / or fat deposits no longer occur on how they are common in open pumping stations. in the the rest can by a special automatic tracking Pumps 6 ensured by a special level device that such fatty substances and floating substances be peeled off on the surface. It also means that the possibility of air in the liquid collection container 7 to be able to bring, which downstream Check valves very gently before a final shutdown of pumps 6 close. Pressure surges that cause damage can safely be prevented. Of course, the above-mentioned run-on times are system-specific adjustable.

A programmable logic control, not shown is used to control the entire wastewater lifting plant. Moreover system states or measured values can be recorded with this Interrogate. This includes, for example, a pressure sensor in the liquid collecting container 7, which reached the Liquid level sensed. There are also flow monitors provided in the pressure line 10. With the help of Control logic can be flexible on various system failures be reacted to.

In design terms, it is noteworthy that the floor of the sewage shaft 1 at the same time the bottom of the liquid collecting container 7 forms. This is particularly successful in the present case simply due to the fact that both the Shaft 1 and the liquid collecting container 7 Plastic, especially PE (polyethylene) are made. The inlet manifold is also made of the same material 2, the supply lines 3, the connecting lines 12, the derivatives 5 and the pressure lines 10.

Only the two solids storage containers 4 are off Stainless steel made to last as long as possible - too with aggressive media and / or coarse solids - too guarantee.

Claims (10)

Wastewater lifting plant, with at least one bulky material collecting container (4) for wastewater guided thereby and loaded with bulky substances, furthermore with a liquid collecting container (7) for the wastewater freed from bulky substances and pre-cleaned in the bulky material collecting container (4), and with at least one Pump (6) assigned to the bulky material collecting container (4) for emptying the liquid collecting container (7) via the bulky material collecting container (4), characterized in that the bulky material collecting container (4) has at least one separating sieve (9) in its interior. which keeps the bulky materials away from the pump (6). Wastewater lifting plant according to claim 1, characterized in that that the separating sieve (9) as a horizontal sieve (9 ') or Curved screen (9) is formed. Wastewater lifting plant according to claim 1 or 2, characterized in that the separating sieve (9) the bulky container (4) in the longitudinal direction in a bulky substance Container area (4a) and a container area free of impurities (4b) divided. Sewage lifting plant according to one of claims 1 to 3, characterized characterized that the container area is free of impurities (4b) via a discharge designed as a bypass (5) (5) is connected to the pump (6), and that the bulky Container area (4a) both to the pump (6) as well as to a pressure line (10) to continue the elevated Sewage is connected. Sewage lifting plant according to one of claims 1 to 4, characterized marked that the bulky material collection container (4) has a non-return flap (11) on the inside a connecting line (12) to the pump (6) when inflowing Wastewater seals. Sewage lifting plant according to one of claims 1 to 5, characterized marked that the bulky material collection container (4) upstream of a feed line (3) with non-return flap (13) is, the check valve (13) in the feed line (3) in through the supply line (3) in the bulky waste container (4) flowing (contaminated) waste water opens and by means of the bulk container (4) the pump (6) into the pressure line (10) pumped waste water closes. Wastewater lifting plant according to claim 6, characterized in that the check valve (13) than in the supply line (3) inclined to a horizontal (H) Round flap (13) is formed. Sewage lifting plant according to one of claims 1 to 7, characterized marked that the bulky material collection container (4) an inlet distributor (2) is arranged, which one connected to the liquid collecting container (7) Has overflow (15). Sewage lifting plant according to one of claims 1 to 8, characterized characterized in that the inlet manifold (2), the Bulky material collecting container (4) and the liquid collecting container (7) as separate assemblies under Representation of a modular unit are executed. Wastewater lifting plant according to one of claims 1 to 9, characterized in that the liquid collection container (7) and a sewage shaft receiving the sewage lifting plant (1) are preferably made of plastic, the bottom of the manhole simultaneously being the bottom of the liquid collecting container (7) forms.

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