WO1996002467A1

WO1996002467A1 - Clearing or settlement tank

Info

Publication number: WO1996002467A1
Application number: PCT/DE1995/000896
Authority: WO
Inventors: Bernd Glaser
Original assignee: Bernd Glaser
Priority date: 1994-07-13
Filing date: 1995-07-11
Publication date: 1996-02-01
Also published as: ATA906795A; DE19580792D2; DE9411327U1; AT406260B; AU2920595A; DE19580792B4

Abstract

A clearing or settlement tank with a run-off channel for pure water having holes for the entry of pure water from the tanks into the run-off channel and connected to an extraction line, in which the run-off channel has a rectangular cross-section and is immersed in the water in the tank.

Description

Clarifiers or sedimentation tanks

The invention relates to a settling tank or settling tank according to the preamble of claim 1.

For the removal of pure water from round or longitudinal pools, drainage channels with a U-cross section are normally used, in which the water falls into the channel via a smooth or jagged overflow edge. However, these channels have the disadvantage that the overflow edges have to be adjusted very precisely. In addition, large sources of error, particularly in the case of round pools, can arise due to uneven head heights which are the result of settling phenomena or wind influences.

For this reason, systems are also used in sewage treatment that do not function according to the law of robbery, but rather according to the law of discharge. For this purpose, drain pipes and gutters are known in sewage or water treatment plants, which have immersed holes. The perforated drainpipe has the disadvantage that the holes are provided either at the upper vertex or laterally along the radius of curvature. If the holes are at the top, the channel is only hydraulically loaded on one side. Floating substances can easily be entrained, since the suction jet is directed vertically upwards from the holes. The holes must be drilled halfway up the pipe for a clearly hydraulic double-sided drain pipe. However, this wastes additional pool volume because a minimum distance for the floating sludge clearance must be maintained between the pipe apex and the water surface and a sufficient depth must be provided below the holes. This disadvantage is overcome by perforated channels that are open at the top. However, these have the disadvantage that they look out of the water and hinder cleaning, in particular between the drainage channel and the pool wall.

Proceeding from this, the object of the invention is to create a pool which favors the evacuation of floating materials and which enables a hydraulically more favorable drainage of pure water with a reduced need for clarifier volume.

The solution to this problem and advantageous Ausgestaltun¬ gene are specified in the claims.

In the basin with a rectangular cross-section and immersed drainage channel according to claim 1, no interfering device protrudes from the water, so that a continuous sludge clearing can be installed up to the side wall of the basin. The box-like design of the drainage channel enables the holes to be placed in such a way that hydraulic pressure is applied to one or two sides Channel hardly any additional pool height and thus further clarification volume is required. In particular, the holes can be arranged in the upper region of the channel. The holes can be arranged in a top wall and / or in a side wall or in both side walls of the gutter. In the latter case, they are preferably provided near the top wall in the side wall. In particular then, the top wall can have a projection over the side wall with holes. This prevents sunlight from shining on the holes and algae which clog the holes form there. In addition, the overhang prevents floating sludge from being carried away by the suction effect of the holes.

The drainage channel can be completely welded or fitted with a screwed-on cover wall. The top wall can also be provided with a hinge on one side and with a screw or clamp connection to the channel on the other side. The detachable top wall has the advantage that the drainage channel can be opened for cleaning or revision purposes (e.g. in the event of silting up, incrustation, etc.).

The box-shaped trough has the further advantage that it can also be provided with an extension and / or a slope by changing the width and / or height. This is particularly important if sludge can subsequently settle in the channel. In the case of a tubular drainage channel, this can only be achieved with considerable constructional and manufacturing expenditure.

As already explained above, this basin works quite well with a submerged drainage channel if there are no major changes in the amount of water. Others- if it is advisable to provide an adjustable stowage means in order to avoid strong water level fluctuations in the discharge line. The dam is preferably the actuator of a control device for the water level in the pool. The control device can have a scanning of the water level and motor drive of the storage medium or a float with a mechanical regulator.

A control or regulation can be dispensed with if a basin according to claim 10 is used. This system has a drainage channel which is only partially immersed and is open at the top, with a combination of holes and overflow edges. If the drainage channel is provided with holes in the lower area, for example, the unevenness of the water drainage is greatly reduced. If the water level rises, the water falls into the channel from above when the overflow edge is reached. The sources of error described above can occur in the overrunning partial flow. However, the overall error is greatly reduced because only a partial flow falls over and a base load continues through the holes in the side wall. A combination has thus been created which reduces the disadvantages of the systems which function according to the law of outflow and according to the law of robbery.

With a long inflow of minimal amounts of water, it can happen that the water level does not reach the overflow edge, but only flows through the holes. As a result, a contaminant floating layer can form over time, which cannot drain off. It can therefore be helpful to raise the water level so that the contaminants can get into the drainage channel. This can be done with a damming agent in the discharge line in the gutter. If floating substances are not to get into the gutter, a baffle can be arranged at a distance from the inner side wall of the gutter. A separate baffle is not required if the water level cannot drop to the holes. For this purpose, the holes can be placed so deep that they are sufficiently far below the water level and thus under a layer of floating sludge. However, the number and cross section of the holes can also be designed such that there is a sufficient distance of the water level from the holes even with a minimum flow rate. A rise in the water level with the inflowing amount of wastewater can be countered by an overflow edge on the outer side wall of the wastewater channel. With this overflow edge, the further rise in the water level is considerably reduced or limited. The entire drainage channel then functions as a perforated channel on the inner side wall and as an overflow channel on the outer side wall. It must then be ensured that the inner side wall is so high that, even with maximum water intake, the water level is lower than the upper edge of the inner side wall and this works as a baffle. This version has the advantage of a dampened drainage behavior and the elimination of a separate baffle.

Furthermore, a separate baffle can be omitted if the holes and the overflow edge are only arranged on the outer side wall of the channel. In this case, the entire channel acts as a baffle, under which the pure water has to flow in order to get into the channel through or through the outer side wall.

The drain channel, open at the top, can be used as a separate component or as part of the pool wall. In the latter In this case, the perforated side wall that forms an overflow edge can be a fixed plate.

Further details and advantages of the invention result from the following description of the attached drawings of preferred exemplary embodiments. The drawings show:

Fig. La a round pool with two embodiments of a gutter from the top view;

1b shows a round basin with a further drainage channel arrangement in a top view;

Fig. 2, the basin of FIG la with drainage and drain line in an enlarged partial section;

Fig. 3 gutter of the same basin in an enlarged cross section

4 detail corresponding to FIG. 2 with float-controlled regulation of the water level;

5 Detail according to FIG. 2 with flap control of the water level;

6 a and b drain channel with perforated and overhanging side walls in cross-section (FIG. 6a) and in longitudinal section (FIG. 6b);

7 a and b drain channel with perforated inner side wall and an overflow edge having outer side wall in cross section (FIG. 7a) and in longitudinal section (FIG. 7b); 8 concrete channel with screwed-on side wall with holes and overflow edge and baffle.

According to FIG. 1, the sedimentation basin can be designed as a round basin 1. According to FIG. 1 a, this has a drainage channel 2 near the wall, which can be designed as a round channel 2 'according to the upper half of the picture or as a polygonal channel 2' 'according to the lower half of the figure. The drainage channel 2 is provided at least at one point with a discharge line 3 which is led through the wall of the round basin 1 to the outside. The circular pool 1 has, for example, an inner diameter D of 20 m.

According to FIG. 1b, the circular pool 1 can also have a large number of individual channels 2, which are directed in the form of a beam towards the pool center with an inlet structure 1 '. The drainage channels 2 pass through the wall of the round basin 1 and, in the embodiment shown, feed an outer collecting channel 1 ″, which runs around on the outside of the basin. The collecting trough 1 ″ in turn feeds a discharge line 3.

2 shows an embodiment in which the drainage channel 2 is completely immersed under the water level 4 and closed at the top. It is held on the wall of the circular clarifier 1 by means of brackets 5. An adjustable throttle element 6 is arranged in the discharge line 3. By adjusting the throttle element 6, the height of the water level 4 in the basin 1 can be adjusted.

This gutter 2 has a rectangular cross section. As can be seen better from FIG. 3, the drainage channel 2 has a bottom wall 8 with laterally vertically protruding side walls 9, which have support sections 10 bent outwards. Lies on the support sections 10 a top wall 11 which laterally projects beyond the support sections 10 with short edges 12. The top wall 11 is screwed to the support sections 10. In the area of the support sections 10, the top wall 11 thus has protrusions 13 on both sides of the side walls 9.

In the top wall 11 holes 14 are arranged laterally and in the middle for pure water drainage. In the side walls 9 there are also holes 15 for the pure water drainage immediately below the projections 13. In addition, a static relief hole 16 is arranged in the outer side wall 9 ″ near the bottom wall 8. The gutter 2 preferably has only the holes 15. However, all or all of the holes 14 to 16 shown can also be provided in combination.

The edges 12 projecting laterally beyond the support sections 10 can - as indicated by dashed lines at 12 '- be pulled down next to the side walls 9, to a point below the holes 15. but with their extensions 12 'hold swimming sludge from the holes 15 when the water level drops below their level.

FIG. 4 differs from FIG. 2 in that the water level 4 in the basin 1 is automatically controlled. For this purpose, the discharge line 3 is provided with an axially displaceable telescopic tube 17 instead of an adjustable throttle valve on the overflow 7. The telescopic tube 17 is connected to an arm of a two-armed lever 18, the other arm of which is coupled to a float 19. The float 19 is located in a float vessel 20, which is connected via a line 21 to the interior of the circular Basin 1 communicates so that the water level 4 'in the float tank 20 always has the same level as the water level 4 in the pool 1. As a result, when the water level 4 rises, the telescopic tube 17 is lowered and the amount of water drawn off is increased and vice versa, as a result of which the water level 4 in the basin 1 is regulated at an approximately constant level. The levers 18 can also control the throttle element 6 of FIG. 2 instead of the telescopic tube 17.

In the version according to FIG. 5, the arrangement of the channel 2 in the basin 1 corresponds to that of FIGS. 2 and 4, so that reference can be made to the relevant discussions. The discharge line 3 opens directly after passing through the basin 1 to the adjacent shaft 22, the outer side wall of which is closed at the top by a pivotable flap 23. The pure water runs off at 24 over the upper edge of the flap 23. By adjusting the pivoting position of the flap 23, the height of the water level 4 'in the channel 22 can be adjusted. The water level 4 'in turn controls the position of the water level 4 in the basin 1. By adjusting the flap 23, the water level 4 in the basin 1 can thus be set or kept constant when the water supply fluctuates. Instead of a pivotable flap, a vertically displaceable plate can also be provided.

6 and 7 show another variant of the invention with drain channels 2 open at the top, which only have a bottom wall 8 and an inner side wall 9 'and an outer side wall 9''. 6, the inner side wall 9 'and the outer side wall 9''are provided in the upper third with holes 15', 15 '' for a pure water drain. The upper edges of both side walls 9 ', 9''are designed as overhang edges 25', 25 ''. det. As shown in FIG. 6b, these are designed in a jagged manner. The inner side wall 9 'of this drainage channel 2 is preceded by a separate diving wall 26, which keeps floating sludge on the water level 4 from the drainage channel 2. Pure water can flow out under the baffle 26 through the holes 15 'and 15''into the drainage channel 2. When the water level 4 rises, a partial flow overflows over the overflow edges 25 ', 25''. This results in a damped drainage behavior at a water level 4 between the holes 15 ', 15''and the overflow edges 25', 25 ''. If the water level 4 continues to rise, the overflow edges 25 ', 25''act as a relief.

7 shows a version in which only the inner side wall 9 'is provided with holes 15' in the lower third. The inner side wall 9 'is designed as a diving wall, which always projects above the water level 4. The upper edge of the outer side wall 9 ″ forms a serrated overflow edge 25 ″, which is illustrated in FIG. 7b.

In this version, the inner side wall 9 'retains floating sludge. A basic portion of the pure water is withdrawn through the holes 15 '. In the event of significant increases in the water supply, the water level 4 exceeds the overflow edge 25 ″, as a result of which the water level in the clarification basin is limited at the top. The holes 15 'are designed here in diameter and number of pieces so that the water level 4 does not drop onto the holes even with a minimum amount of water.

In the variant according to FIG. 8, a basin wall 1 has a cast-on concrete channel 2 on the inside. Wall 9 'of the concrete trough 2 has a metal plate 27 at the top with holes 15' and a serrated overflow edge 25 'which can be fixed by means of screws.

Furthermore, the cast-on channel 2 carries, at a distance on the inside of its plate 27, a baffle 26 which retains floating sludge. In this variant, immersed holes 15 'and overflow edge 25' are therefore only formed on the inner wall 9 'of the channel and are combined with a concrete channel 2.

Claims

Expectations

1. clarifier or sedimentation basin, with a drainage channel (2) for pure water, which has holes (14, 15, 16) for the entry of pure water from the pool (1) into the drainage channel and is connected to a drain line (3), characterized in that the drainage channel (2) has a rectangular cross section and is immersed in the water in the basin (1).

2. Basin according to claim 1, characterized in that the holes (14) in a top wall (11) of the gutter (2) are arranged.

3. Basin according to claim 1 or 2, characterized in that the holes (15) in at least one side wall (9) of the drainage channel (2) are arranged.

4. Basin according to claim 3, characterized in that the holes (15) near the top wall (11) in the side wall (9) are arranged.

5. Basin according to claim 3 or 4, characterized in that the top wall (1) has a protrusion (13) over the Be¬ tenwand (9) with holes (15).

6. Basin according to claim 5, characterized in that the projection extends to below the holes (15) of the side wall (9).

7. Basin according to one of claims 1 to 6, characterized ge indicates that the top wall (11) has a weld, hinge, screw and / or clamp connection with the side walls (9).

8. Basin according to one of claims 1 to 7, characterized ge indicates that the drainage channel (2) in width and / or height is seen with an expansion or increase.

9. Basin according to one of claims 1 to 8, characterized ge indicates that an adjustable storage means (6, 17, 23) is arranged in the discharge line (3).

10. Basin according to one of claims 1 to 9, characterized ge indicates that the storage means (17) is an actuator of a control device (18, 19) for the water level (4) in the basin (1).

11. Basin according to the preamble of claim 1, characterized in that the drainage channel (2) is open at the top, has the holes (15) in at least one side wall and has an overflow edge (25) on at least one side wall.

12. Basin according to claim 11, characterized in that an adjustable stowage means is arranged in the discharge line.

13. Basin according to claim 11 or 12, characterized gekennzeich¬ net that a baffle (26) is arranged in front of the inner side wall (9 ') of the gutter (2).

14. Basin according to one of claims 11 to 13, characterized ge indicates that the minimum water level (4) is always held above the holes (15) in the inner side wall (9 ').

15. Basin according to claim 14, characterized in that the inner side wall (9 ') with the holes (15) a baffle and the overflow edge (25' ') is arranged on the outer side wall (9' ').

16. Basin according to claim 11, characterized in that the inner side wall (9 ') is a diving wall, the holes (15' ') are arranged in the outer side wall (9' ') and the overflow edge (25' ') is arranged in the outer side wall (9 '').

17. Basin according to one of claims 11 to 16, characterized ge indicates that the overflow edge (25) is serrated.

18. Basin according to one of claims 1 to 17, characterized ge indicates that the drainage channel (2) at least partially rotates parallel to the wall of a round basin (1) or is directed radially from the wall towards the center of the basin.