EP1108822B1 - 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 bulk container with at least a separating sieve arranged inside for this guided and with bulky or coarse solids contaminated wastewater, also with a liquid collection container for the freed of bulky substances and in which Bulky material waste water pre-treated, and with at least one assigned to the bulky material container Pump for emptying the liquid collection container via the bulky material collection container, with the separating sieve Bulky material collection container in a bulky material Container area and a container area free of impurities subdivided, furthermore the container area free of bulky material by means of a discharge designed as a bypass with the Pump is connected with pre-cleaned and pumped wastewater via the derivation can get into the bulky material container, and the bulky material Container area to both the pump and a pressure line connected to the continuation of the raised wastewater is.

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 you have sewage lifting u. a. 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 pumped 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 matter collecting vessel. Ideally they remain Bulky substances in this bulky 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 in the liquid collection container or via a Bypass get into this (see. DE 196 50 625 C1). 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 Floating ball. This ensures that when switched on Pump and pumped out of the liquid collection container pre-treated wastewater in the bulky waste container not additionally waste water contaminated with solids through an inlet pipe into the bulky waste container arrives. When the pump is switched off, the floating ball returns or the shut-off device, the opening in question of the bulk material collecting 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 with regard to the retention of solids, not convincing in all points. Can also by Shut-off ball only then closes the inlet line are 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 of the entire facility.

Other problems arise with a generic one Wastewater lifting plant on. 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 expense disadvantageous.

This also applies to the one known from FR 752 942 A. Sewage lifting plant, from which the invention is based. This is with a separating sieve inside the bulk container equipped. However, this poses an increasing with increasing degree of pollution Flow resistance represents. Otherwise, can not always be guaranteed that the bulky materials on it when reversing the direction of flow from Separating screen to be detached.

DE 28 22 877 A1 faces similar problems. This deals with a lifting device for thick matter staggered waste water or the like. To this Purpose is a collection room, in which one Inlet chamber from which waste water and thick matter flow in. Liquid components pass through from the collecting space a separator and a pressure pipe in a as Centrifugal pump trained pump from where it continues over the suction pipe of the aforementioned pump into a pump sump reach.

The separating device in question is horizontal with rake-like arranged elements equipped, each are slanted. In this case too, the aforementioned Problems not mastered.

The invention is based on the technical problem Wastewater lifting plant of the construction described above to further develop 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 a generic wastewater lifting plant that the pre-cleaned and both wastewater pumped via the discharge line or the bypass as well as a connecting line get into the bulky waste container can, the connecting line to the bulky container area connected.

This procedure has the advantage that the bulk container with a two-part Electricity. A cleaning stream through the Discharge or the bypass usually ensures that the barrier substances deposited on the separating sieve be solved while a through the connecting line led transport stream the detached bulky materials entraining

When the wastewater flows into the bulky waste container a non-return valve closes the aforementioned connection line, so that the wastewater contaminated with bulky material pressed through the separating sieve and only over the discharge or the bypass flows to the pump. in the Incidentally, it is provided that an inlet distributor, the Bulky material collection container and the liquid collection container as a separate assembly with each separate housing showing a modular unit are executed.

In addition, the separating sieve is usually a horizontal or Curved sieve and can be the bulk container in its longitudinal direction in the bulky material Container area and the container area free of impurities divide.

The (lower) container area is free of bulky materials via the bypass with the pump in Connection while the (upper) container area is loaded with bulky material to both the pump and the pressure line connected to the continuation of the raised wastewater is. In this context, the invention proposes further ahead that the bulky material collection container has a check valve owns, which is suitable, which - besides that as Bypass drainage - additional connecting line close to the pump with incoming wastewater.

In this way, the container area is loaded with bulky material of the bulky container when it flows in Wastewater sealed 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 Separating sieve and finally the discharge or the bypass be removed from the bulky waste container. Because the separating sieve must necessarily be passed here, the bulky or coarse solids from this retained.

According to a proposal of the invention with independent Significance is provided that the one already mentioned Supply line to the bulk material container with an (own) Check valve is equipped. This supply line is the Bulky material collection container upstream and ensures that Supply of the wastewater contaminated with bulky substances. The The aforementioned check valve in the supply line opens at through the supply line into the bulky waste container flowing (contaminated) waste water and closes through the bulky material container by means of the pump in the pressure pipe conveyed wastewater. This closing process the check valve is so by the in Bulky material collection container and thus built up in the supply line Pump pressure accomplished.

This non-return valve can be one in the supply line in use position against a horizontal act inclined round flap. Because of this inclination is achieved that even small overprints in the Cable for a perfect opening of this check valve to care.

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 Sieves or separating sieves can, for example, ensure that a kind of pre-classification already exists in the inflow distributor of the solids in the wastewater takes place. For example, this can be particularly rough Components are retained.

By the realized in the context of the second proposal Modular unit can be maintenance and construction Achieve advantages. Because the inflow distributor, the bulky substance container and the liquid container have their own housing, can consequently separate maintenance and repair work undergo without the facility as a whole must be stopped. This works because in the Usually two bulky waste containers with associated pumps are realized alternately or together can be operated.

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

The container area of the Bulky solids retention container retained - as in the German patent DE 196 50 625 C described - carried in 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 inside of the bulk container Separating sieve provided according to the invention becomes a perfect one Pre-treatment of the wastewater achieved. Because this Separating sieve usually extends in the horizontal direction over the entire length of the bulk container and thus has a relatively large surface area on. In any case, this is significantly larger than that of separator flaps replaced in accordance with 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 - is housed in its own housing, consequently corresponding Exchange and maintenance work is easy can be done. With this possibility of replacement can of course also waste water with different loads 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 the technology is always to be feared. Finally, you can with the help of the specially designed inlet distributor Overflow also large amounts of waste water per unit of time be mastered, which the state of the art so far could not cope with. Here are the main ones See advantages of the invention.

Fig. 1

eine Abwasserhebeanlage mit zwei Sperrstoff-Sammelbehältern,

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

3 shows a side view of the object according to FIG. 2 from 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

Fig. 6

and 7, the non-return valve in the feed 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 in the figure description of DE 196 50 625 C1 described. After that, the left are in practice and 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.

Part of the basic structure of the sewage lifting plant an inlet distributor 2, via which waste water in FIG. 1 is fed from the left. This wastewater is with Bulky or solid F loaded. Of this Inlet distributor 2 from 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, wastewater into a liquid collection container 7. This is possible because it is the Pump 6 is a centrifugal pump that has a corresponding Cross section for the pre-cleaned Wastewater. The pre-cleaning of the Waste water in the bulky material collecting container 4 takes place by means of a separating screen 9, which in the present case is a curved screen 9 is formed (see. Fig. 4 and 5). Also a horizontal sieve 9 'is conceivable. According to the embodiment is in left part of Fig. 1 of the inflow of bulky materials F contaminated wastewater shown, while the right Part represents sewage lifting.

1, 2 and 3 show that two Bulky material collecting container 4 with associated derivatives 5 and pumps 6 are provided, which each have two Feed lines 3 are fed from the inlet distributor 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 waste water contaminated with bulky 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 using the pump 6 on the Derivation 5 and a connecting line 12 through the bulky container 4 transferred into a pressure line 10. At the end of this pressure line 10 there may be a wastewater treatment plant are located. You can see that with this Wastewater lifting process previously in the bulk container 4 deposited barrier materials F from the separating sieve 9 be washed away and one via the pressure line 10 Further treatment can be supplied. Because it is Separating sieve 9 in the interior of the bulky material collecting container 4 a curved screen 9 acts, succeeds a particularly uniform and fine distribution of the barrier substances F on this Curved screen 9, with a small thickness of an associated one Blocking material layer. Consequently, the barrier substances F in the subsequent pumping process from the separating sieve 9 loosen so that they are practically resistance-free in the pressure line 10 can be rinsed. 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 non-return flap 11 provided there 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 cordoned off. As a result, forms in the bulk container 4 a foreclosed, contaminated Container area 4a in the upper part and to the liquid collecting container 7 open, bulky container area 4b in the lower part (see. Fig. 1 and 4 and 5).

The fact that the container area 4a is closed laterally and that with barrier materials F contaminated waste water flows in via the feed line 3 this is pushed through the separating sieve 9 and can over the derivation or the bypass 5 - and only this - for Drain pump 6 out. Through this process, it becomes before Waste water contaminated with barrier substances F because the Coarse residues are practically absorbed by the separating sieve 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 allows.

As soon as the liquid level in the liquid collection container 7 has reached or exceeded a certain level, is controlled by a so-called level control in the Normally one pump 6 is put into operation. Of course, both pumps 6 can simultaneously work. According to the embodiment, however, only Pump 6 shown in the right part of FIG and sucks the pre-cleaned wastewater from the Liquid collecting container 7 in the indicated by arrows Direction of flow. You can see that that such extracted and pre-treated wastewater the pump 6 both via the derivation or the bypass 5 as also the connecting line 12 in the bulky material container 4 arrives. Through this flow process the Check valve 11 opened. At the same time it closes a further check valve located in the feed line 3 13, which during the wastewater supply process left part of FIG. 1 was previously opened.

This check valve 13 is shown in detail in FIGS. 6 and 7 shown and as in the feed line 3 to one Horizontal H inclined round flap 13 executed (Inclination angle α; see Fig. 6). The slope shown enables easy opening of this check valve 13 when the wastewater enters (see the arrows in the left Part in Fig. 1 and in Fig. 6). The pre-cleaned wastewater raised against it, the check valve closes 13. Because due to the pumping effect in the bulk container 4 comparing higher pressure the above-mentioned non-return valve becomes the inlet distributor 2 or circular flap 13 moved to the closed position, as in right part of Fig. 1 is shown. Hence can during this conveying process none with bulky substances F contaminated waste water from the inlet distributor 2 via the Feed supply line 3 into the bulk material container 4.

This enables the previously on the Release the separating screen 9 from the blocking materials F can and from the bulk container 4 in the Pressure line 10 are flushed out. Of course can instead of the described mechanical closure the check valve 13 is 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 substance 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 pre-cleaned the liquid collection container 7 can be supplied.

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 possible overpressures in the pressure line 10 Dismantle via the inlet distributor 2.

The inlet manifold 2, the bulky containers 4 and the liquid collection container 7 are as from each other separate assemblies or containers showing one modular unit and each have separate Housing on. So cleaning, repair, Maintenance or replacement of individual components possible independently of the other units. Through the closed design 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 through a special level device for this care is taken to ensure that such fatty substances and floating substances be peeled off on the surface. There is also this gives the possibility of air in the liquid collection container 7 to be able to bring, which downstream Check valves very gently before a final Shut off pumps 6. Pressure surges leading to This can reliably prevent damage. 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 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 succeeds in the present case particularly simply due to the fact that both the Shaft 1 and the liquid collection container 7 Plastic, especially PE (polyethylene) are made. Incidentally, the are made of the same material Inlet manifold 2, the feed lines 3, the connecting lines 12, the leads 5 and the pressure lines 10. Only the two solids storage containers 4 are made of stainless steel to ensure the longest possible service life - even with aggressive media and / or coarse solids - to ensure.

Claims (8)

1. A sewage lifting installation, comprising

   at least one bulky matter collecting vessel (4) comprising at least one separating screen (9) disposed in its interior for sewage which contains bulky matter and which is conveyed through it, additionally comprising

   a liquid collecting vessel (7) for the sewage which is freed from bulky matter and which is pre-purified in the bulky matter collecting vessel (4), and comprising

   at least one pump (6), which is associated with the bulky matter collecting vessel (4), for emptying the liquid collecting vessel (7) via the bulky matter collecting vessel (4), wherein

   the separating screen (9) subdivides the bulky matter collecting vessel (4) into a vessel region (4a) which contains bulky matter and a vessel region (4b) which is free from bulky matter, wherein in addition

   the vessel region (4b) which is free from bulky matter is connected to the pump (6) via a branch line (5) designed as a bypass (5), and wherein

   pre-purified sewage which is conveyed by means of the pump (6) can enter the bulky matter collecting vessel (4) via the branch line (5), and wherein

   the vessel region (4a) which contains bulky matter is connected both to the pump (6) and to a pressure line (10) for conveying the lifted water away,

   characterised in that

   the pre-purified sewage which is conveyed by means of the pump (6) can enter region (4a) of the bulky matter collecting vessel (4), which region contains bulky matter, via a connecting line (12) of the waste water lifting installation.
2. A sewage lifting installation according to claim 1, characterised in that a feed distributor (2), the bulky matter collecting vessel (4) and the liquid collecting vessel (7) are designed as sub-assemblies which are separate from each other and which each comprise a separate housing, whilst constituting a modular unit.
3. A sewage lifting installation according to claims 1 or 2, characterised in that the separating screen (9) is formed as a horizontal screen (9) or as a curved screen (9').
4. A sewage lifting installation according to any one of claims 1 to 3, characterised in that the separating screen (9) subdivides the bulky matter collecting vessel (4) in the longitudinal direction thereof into the vessel region (4a) which contains bulky matter and into the vessel region (4b) which is free from bulky matter.
5. A sewage lifting installation according to any one of claims 1 to 4, characterised in that the bulky matter collecting vessel (4) has a flap trap (11) in its interior which is suitable for closing the connecting line (12) to the pump (6) when sewage flows in.
6. A sewage lifting installation according to any one of claims 1 to 5, characterised in that a feed line (3) comprising a flap trap (13) is disposed upstream of the bulky matter collecting vessel (4), wherein the flap trap (13) in the feed line (3) opens when sewage flows through the feed line (3) into the bulky matter collecting vessel (4), and closes when sewage is conveyed through the bulky matter collecting vessel (4) into the pressure line (10) by means of the pump (6).
7. A sewage lifting installation according to claim 6, characterised in that the flap trap (13) is formed as a round flap (13) which is suspended in the feed line (3) and which is inclined to the horizontal (H) in its working position.
8. A sewage lifting installation according to any one of claims 2 to 7, characterised in that the feed distributor (2), which comprises an overflow (15) connected to the liquid collecting vessel (7), is disposed upstream of the bulky matter collecting vessel (4).

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