EP0670969A1

EP0670969A1 - Device for limiting the outflow and simultaneous intermediate storage of waste water and separation

Info

Publication number: EP0670969A1
Application number: EP94926153A
Authority: EP
Inventors: Anton Felder
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-23
Filing date: 1994-08-04
Publication date: 1995-09-13
Also published as: AU7611094A; DE4332404A1; JPH08504010A; US5597492A; WO1995008717A1

Abstract

The invention relates to a device for limiting the outflow and the simultaneous intermediate storage of waste water and the separation of depositable and floating substances from waste water in which there is a swirl chamber (2) connected to the intake (1) and designed in the natural spiral shape of the eddy which has round apertures (4; 6) at the top and bottom, and the top aperture (6) seamlessly connects with a rotation-symmetrical container (8) in which a feed pipe extends centrically from the top aperture (6) to just below the upper edge (10) of the container.

Description

DEVICE FOR LIMITING OUTFLOW AND SIMULTANEOUSLY STORAGE

OF WASTEWATER AND SEPARATION

The invention relates to a device for limiting the flow and at the same time temporarily storing waste water and separating settable and floating substances from dirty water.

The invention also relates to such a method.

Drainage limiters are known in which the throttling effect arises from the swirl effect of a vortex flow, for example in DE PS 507 713 and DE PS 26 43 029.5. It is also known that there are vortex separators which temporarily store the dirty water and that a dirty water treatment takes place, as for example in DE PS 36 34 122. These devices, however, at best offer two of the three possible combinations of discharge restrictions, storage and separation of removable and floating substances from dirty water.

For reasons of environmental protection, untreated dirty water should not be fed into the water cycle. In the event of heavy rain events, however, the sewage treatment plants are not able to process the waste water from the catchment areas further, so that part of the dirty water is temporarily stored in rain retention basins. It must be ensured that only a certain permissible amount of water flows from the rainwater retention basin into the sewage treatment plant during the rain event and thereafter. This is generally achieved by narrowing the flow cross-section, by means of orifice-like or nozzle-like devices, by generating friction losses in long throttle sections or by the swirl effect of a vortex flow (so-called vortex throttles). With heavy and prolonged rain, it can happen that the storage volume of the rainwater retention basin is no longer sufficient. The rain retention basins then let the untreated excess waste water run into the receiving water practically without any treatment. There are therefore efforts to carry out further rainwater treatment in the form of a contaminant separation in addition to the discharge limitation in order to protect the receiving water from anthropogenic pollution.

So far, however, mostly only the requirement to limit the discharge has been met by the devices described above. In contrast, no methods are known in practice which achieve a discharge limitation and simultaneous intermediate storage of wastewater as well as separation of settable and floating substances from wastewater with a device.

The invention has for its object to provide a structurally simpler device which can simultaneously ensure a flow restriction, storage and an increase in the separation of settable and floating substances from dirty water. The device should be able to do without mechanically movable wear parts and therefore be low-maintenance and cost-saving.

This should be possible with the smallest possible footprint in a single device.

This is surprisingly achieved in a device of the type mentioned at the outset in that it consists of a swirl chamber which is connected to the inlet and which is designed in accordance with the natural spiral shape of the vertebra and has round openings one above the other on the underside and top side. that there is a rotationally symmetrical container on the opening on the top connects in which a guide tube extending from the top opening to just below the top of the container is arranged centrally.

The process according to the invention for limiting the flow and temporarily storing wastewater and separating settable and floating substances from dirty water is characterized in that a swirl flow, in particular a vortex flow, is impressed on an increased inflow, so that additional inflow exposure causes a space to be caused forms the flow above the first as a second vortex flow, the two swirl flows being used synergistically to separate solid matter.

A continuous air core is expediently built up centrally in the first and second eddy currents, in particular through a guide tube, which ensures the throttling.

Surprisingly, the measure according to the invention is able to do without mechanically movable wear parts and to meet the above-mentioned requirements for simultaneous flow limitation, storage and an increase in separation.

It saves a considerable amount of space, since previously aggregates necessary for the individual functions have been eliminated.

When the weather is dry, the water flows freely through the swirl chamber through the lower opening. If the inflow rises in rainy weather, the vortex chamber fills up and a swirl flow develops. Due to the swirl flow, the throttling effect now sets in, since the current paths consist of a logarithmic see spiral with strong flow acceleration to the lower opening. The principle of loss is based on the fact that large tangential speeds and thus large centrifugal forces arise near the axial outlet nozzle, these generating a counterpressure which keeps the outflow small. Due to the ^* centrifugal forces, a ventilated vortex core forms in the center of the vortex chamber. In the event of heavy and prolonged rain, the rotationally symmetrical container fills up, since the outflow from the lower opening remains constant even with more water flowing in, and thus the excess water flows into the container through the upper opening. Numerous smaller rain events are caught by the container volume alone, without water escaping to the receiving water. If the volume is no longer sufficient, then the water flows over the circumferential overflow edge into a collecting channel and from there into the receiving water. It is crucial, however, that a swirl flow also occurs in the container and the ventilation and the stabilization of the vortex core are maintained by the guide tube. The throttling effect is still there, even if more and more water flows in.

A vortex flow prevails in the vortex chamber and in the container, which is extremely low in turbulence and is therefore particularly suitable for separating contaminants. Fibers, suspended matter and solids are already conveyed to the exit of the chamber in the swirl chamber.

Dirt particles that still get into the rotationally symmetrical container are in turn ultimately conveyed back into the vortex chamber via the guide tube because of the vortex flow prevailing there. The vortex currents that occur in the vortex chamber and in the container have the effect that the separation is synergistically increased: as a result, the total separation efficiency is far higher than that of conventional vortex systems. separating. It is thus possible to achieve an outflow limitation and simultaneous intermediate storage of wastewater and separation of settable and floating substances from wastewater in one device.

In a further development of the invention, an advanced baffle can also be arranged at a certain distance from the edge of the container, as a result of which floating substances and fats are advantageously retained in the container.

Due to the swirl movement in the container, the transport of the floating substances and fats to the vortex center can be achieved by attaching a spiral baffle directed towards the center. In addition, such a spiral baffle also serves to stabilize the aerated vortex core.

According to a further invention, there are considerable further advantages if one arranges a baffle running spirally towards the center without using a guide tube.

An example embodiment of the invention is now intended to

With reference to the accompanying drawings are explained in which

1 is a view

Fig. 2 is a section along line A-A of Fig. 1 of this embodiment;

Fig. 3 shows an embodiment with a spiral baffle and

Fig. 4 is a top view of Fig. 3. The device for limiting the flow and simultaneously storing wastewater and separating settable and floating substances from dirty water comprises an inlet 1 into a vortex chamber 2. This vortex chamber is designed to follow the natural spiral shape of the vortex. The vortex chamber 2 has openings arranged one above the other, namely a lower opening 4 and an upper, larger opening 6. The opening 6 is seamlessly joined by the conical axis (at the same time) towards the center axis of the openings 4 and 6 Bottom 14 of a rotationally symmetrical container 8. This bottom 14 of the rotationally symmetrical container 8 lowers in the direction of the axis of symmetry before it ends in the upper opening 6, which is common to the swirl chamber and the container.

The container rim 10 is open in order to allow the water separated from settable and floating substances to flow into the collecting channel 20 to the receiving water.

Between the upper opening 6 of the swirl chamber 2, a guide tube 12 extends centrally to below the upper edge 16 of the container, within which an air core forms when the device is fully or excessively acted upon.

When the weather is dry, the water flows freely through the swirl chamber 2 through the lower opening 4 and is fed directly to the sewage treatment plant. When the inlet is stronger, the swirl chamber 2 fills and a swirl flow is formed. The throttling effect due to the swirl flow, the reason for which was explained above, is interesting. In the vicinity of the axial outlet nozzle 4, large tangential speeds and thus large centrifugal forces are generated, which generate a counterpressure which keeps the outflow small. Forms in the center of the vortex chamber 2 a ventilated vortex core due to the centrifugal forces. The rotationally symmetrical container fills up in the event of prolonged rain, since the outflow from the lower opening remains constant even with more water flowing in, and thus the excess water flows into the container 8 via the upper opening 6. It is important that a swirl flow also occurs in the container 8 and that the ventilation and the stabilization of the vortex core are maintained by the guide tube 12. An advanced baffle 16 can be arranged at a distance from the edge of the container.

The vortex currents that arise in the vortex chamber 2 and in the container 8 have the effect that the separation is synergistically increased. At 70%, for example, the total separation efficiency is far higher than that of conventional vortex separators, for example 35% (which, however, changes depending on the inflow).

It is amazing how small such a device is and how few fragile mechanical parts are required.

Figures 3 and 4 show another embodiment that is particularly suitable for the floating and fat separation, as well as for the stabilization of the aerated vortex core. The height of the spiral baffle 30 is, for example, 40 cm, with a position of 35 cm reaching below the top edge 40 of the container and 5 cm above the top edge 40 of the container. This embodiment works without any guide tube. The diving wall 30, which runs spirally toward the center, leads away from the container edge 40. The floating and fatty particles will thus migrate to the center and be drawn off over the aerated vortex core. The reference numerals otherwise used, which are the same as the previous figures, have the same function.

In the embodiment presented above, the pure circular shape was assumed. A spiral shape (with corresponding structural adjustment) is, however, possible.

Claims

.EXPECTATIONS

1. Device for limiting the outflow and at the same time temporarily storing wastewater and separating settable and floating substances from dirty water, characterized in that it has a vortex chamber (2 ), which includes round openings (4; 6) on the top and bottom, that a rotationally symmetrical container (8) adjoins the top opening (6) seamlessly, in which a center of the top opening (6 ) is arranged until just below the top of the container (10) extending guide tube.

2. Device according to claim 1, characterized in that the upper opening (6) of the swirl chamber is at least the same, preferably 1.2 to 2.3 times as large as the lower opening (4).

3. Device according to one of the preceding claims, characterized in that the guide tube (12) has at least the same diameter as the lower opening (4), preferably 1.05 to 1.2 times.

4. The device according to claim 3, characterized in that the upper end of the guide tube (24) is trumpet-shaped aufwei¬ tend or in the form of a vertebral depression.

5. Device according to one of the preceding claims, da¬ characterized in that the length and position of the Leitrohreε (12) is designed to be changeable in the vertical direction.

6. Device according to one of the preceding claims, da¬ characterized in that the bottom (14) of the rotationally symmetrical container (8) lowers in the direction against the axis of symmetry.

7. Device according to one of the preceding claims, da¬ characterized in that an advanced baffle (16) is arranged at a certain distance from the container rim (10).

8. Device according to one of the preceding claims, da¬ characterized in that from the container edge (42) away to the center spirally extending baffle (30) is arranged.

9. Device according to one of the preceding claims, da¬ characterized in that the top of the swirl chamber is conical.

10. Process for limiting the flow and simultaneous intermediate storage of wastewater and separation of settable and floating substances from dirty water, characterized in that a swirl flow, in particular vortex flow, is impressed on an increased inflow, which is caused by additional inflow admission that in one Space which is rotationally symmetrical above the first, the flow above the first forms a second vortex flow, the two swirl flows being used synergistically to separate solid matter.

11. The method according to claim 10, characterized in that a continuous air core, in particular by a guide tube, is built up centrally in the first and second vortex flow, which ensures the throttling.

12. The method according to any one of claims 10 or 11, characterized ge indicates that the substances to be separated are discharged with a significant inflow into the flow paths from a logarithmic spiral with strong flow acceleration to a lower opening, and that excess water with the room leaves the upper swirl flow at the upper edge and goes against the flooding.