DK200300323U3 - Outlet valve - Google Patents

Description

and DK 2003 00323 U3

The present invention relates to an outlet valve, in particular for use in connection with water treatment, including in particular sludge-containing water.

In connection with special wastewater treatment, the wastewater is pumped around between different tanks, as there is usually a receiving tank, a buffer tank, an aeration tank, a sedimentation tank, a pumping out tank, etc.

In a large number of treatment plants, activated sludge is used, which consists of microorganisms that metabolize and degrade the pollutants in the wastewater. To keep this active sludge alive, air is supplied to ensure the optimal living conditions for the microorganisms needed for the purification process. In certain purification processes, there is also a need for the phosphorus contained in the wastewater to precipitate. For this use, a precipitating chemical is added in the final phase of the aeration cycle.

In a sedimentation tank, the wastewater usually stands still, whereby sedimentation takes place, so that any excess sludge and still remaining contaminant particles can settle. Excess sludge and the remaining part of the pollution are pumped out and filled in a so-called sludge storage.

The purified water, ie. the water which is above the precipitated sludge layer and below a liquid surface can then be pumped out and passed on to the recipient, e.g. a lake, bog or stream.

In general, in all these processes, there is a desire not to carry particles from one tank to another, partly in order not to remove the active sludge and partly in order not to pump contaminated particles / sludge out to the recipient.

A further factor is that, as a control of the quality of the treated water, a small water sample is taken from the pumped water, which water sample often becomes the one according to which the purification quality of the total pumped water is judged.

Thus, there is a need for active sludge not to be moved away from the treatment process, that excess sludge and contaminant particles are not sucked out to the recipient, just as it is not desirable in connection with taking the water sample that other than the purified water is included in the sampling.

A special problem in this connection is the sludge which settles on the outlet valve itself. The outlet valve is as described above located above the sedimented sludge, but below a liquid surface. As there will be some turbulence during filling and aeration in the sedimentation chamber partly due to the filling and partly due to the aeration, particles will bind on and / or in the outlet valve. Traditionally, the outlet valve is provided by inserting a tube into the sedimentation tank, which tube is curved 180 ° at the bottom of the tank, to then protrude again into the liquid, so that the free upward opening of the tube is provided approximately in the middle of the tank.

As the aerated water settles, sedimentation will take place and part of the sedimentation will take place down into the free end of the outlet valve pipe. This relatively small amount of sludge / contamination can have a decisive influence on the outcome of the water sample and is thus not desirable and, depending on the treatment plant's turnover / capacity, can have a greater or lesser influence on the quality of the overall treatment process. Thus, it is desirable to provide an outlet valve where it is avoided that particles bind to and / or in the outlet valve itself.

The present invention solves this problem with an outlet valve which at the end of the substantially vertically placed tube in a container has provided a 180 ° bend so that the open end of the tube faces downwards and that means are arranged on the highest part of the bend, whereby particles in the water does not bind / settle on the valve and that an air supply has been provided before the bending.

By firstly providing a 180 ° bend, it is ensured that no sludge or other contaminants are directly sedimented down into the outlet valve. Furthermore, by arranging means on the highest part of the bend, it is ensured that a minimal amount of sludge can not deposit itself in connection with the outlet valve, so that there is a risk of pumping out this sludge with the purified water. The third step, namely to provide an air supply before the folding, ensures that an air pocket can be created in the folding itself, whereby during the filling, where there may be some turbulence in the liquid and in the aeration phase, it is ensured that do not splash or flush sludge / contaminated water into the outlet valve.

This ensures a very simple but effective protection against unintentional contamination / sludge particles entering the purified water, whether it goes to the recipient or to a water sample.

In a further embodiment, the means by which the particles in the water cannot come to rest on the valve are designed as an upward taper. By thus placing a cone on top of the pipe, the sludge particles will not be able to come to rest on the valve.

In a further embodiment, the means are a pipe part which protrudes above the liquid surface and which pipe part covers the largest part of the upper side of the bend. By bringing a pipe section up above the liquid surface, it is also ensured that no sludge / contaminant particles can remain on top of the bend, at the same time as the pipe section provides an opportunity to fasten the outlet valve to a wall or the like. As described above, the outlet arrangement is typically a pipe which is led down into the sedimentation / aeration container and provided with a 180 ° bend at the bottom thereof, after which it projects up to about halfway in the container. This pipe is relatively exposed due to the turbulence in connection with the filling of contaminated material as well as the aeration process, so it may be desirable to fasten this so that no vibrations occur in the system.

In a third alternative embodiment, the means are a deformation of the cross section of the pipe in the bend, so that the cross section is teardrop-shaped with the tip facing upwards. This is a production-wise convenient way of shaping the bending, thereby providing efficient and inexpensive means of preventing the sludge from remaining on the valve.

To avoid that during the turbulent stages of wastewater, ie. during filling and aeration, contaminated wastewater enters the outlet valve, an air pocket can be established, as described above. This air pocket can be established by inserting an air filling spout before bending, so that during spillage water filling 4 DK 2003 00323 U3 and aeration, air can be continuously pumped in, thereby creating an air pocket, which air pocket will push air out through the valve pipe opening.

In a preferred embodiment, the air supply is established in that a hose or a pipe is arranged inside the pipe of the outlet valve, and that the air supply has a substantially smaller diameter than the inner diameter of the pipe. This in turn ensures that the outlet valve has as smooth an outside as possible, which does not create the possibility that sludge or other contaminating particles can remain on the valve itself, which can thus lead to an additional risk of contamination.

In the foregoing, the invention has been explained with reference to the use of wastewater treatment, but the invention is of course equally suitable for pumping out drinking water or other liquids where it is not desired that sediments be included in the liquid taken out.

In most treatment plants of the type in which this outlet valve is particularly used, mammoth pumps are used, whereby the pipe of the outlet valve can advantageously be designed as described above. It should be emphasized, however, that there are alternative pumps which are equally applicable and that the principles of the invention with regard to avoiding the extraction of sediments are equally suitable regardless of the type of pump used in the current installation.

The invention will now be explained with reference to the accompanying drawing, in which fig. 1 illustrates a treatment plant, fig. 2 illustrates a schematic diagram of a container, FIG. 3 illustrates a design of the outlet valve, FIG. 4 shows an alternative embodiment of the outlet valve, fig. Fig. 5 illustrates a cross-section of an embodiment of the embodiment according to the invention; 1 illustrates a so-called mini treatment plant, but in principle the outlet valve is usable in any water treatment plant and the invention is therefore not limited to use in mini treatment plants, but can be used in all types of water treatment plants as described above.

In FIG. 1 illustrates a treatment plant consisting of three chambers, 1,2,3.1 chamber 2, which in the illustrated example is the sedimentation tank supplied to the wastewater via line 4. When supplying wastewater through the pipe 4, some turbulence will occur in the liquid already is in chamber 2, whereby sludge particles (not shown) will be swirled up so that the liquid in chamber 2 will be substantially a uniformly mixed mass of water, sludge particles as well as contaminant. An aerator 5 is provided at the bottom of the chamber 2 so that air can be supplied to the mixture of wastewater, sludge and water. This supply of air is necessary for the microorganisms to have the optimal living conditions, which is necessary for the purification process. Excess sludge, which settles in the chamber 2, is pumped to a sludge storage in chamber 3 via the pipe 6. The purified / clean water is taken out through the outlet 7, where it is passed through the tank 8 to be passed from there to the recipient e.g. a stream, stream, lake, bog or the like through the pipe 9.1 tank 8, it will be possible to take a water sample so as to check the degree of purification of the purified water which is passed on to the recipient.

In FIG. 2 illustrates a cross section through the chamber 2, where the same elements are found, namely the aerator 5, the excess sludge outlet 6 and the outlet for purified water 7.

In FIG. 2 is the shaded area 10, precipitated sludge and the water surface in the tank are indicated at 11. The present invention relates to the outlet valve, which is not further specified in fig. 2, but is indicated by reference number 12.

In FIG. 3, an embodiment of the outlet valve 12 according to the invention is indicated. The outlet pipe 7 is shown here bent over 180 °, so that the opening 13 of the pipe faces downwards. A pipe section 14 is arranged on top of the bend, which pipe section protrudes above the water surface 11. As can be seen from fig. 2, it all depends on the depth of the chamber 2, relatively long pieces of pipe that stand free in the tank and are therefore exposed to turbulence in the sludge-containing wastewater due to filling of the chamber 2 or during the aeration of the wastewater. By thus arranging a pipe section 14 on top of the outlet valve 12, and that the pipe section rises above the water surface 11, it is possible to hold the outlet pipe 7, 6 DK 2003 00323 U3 so that it becomes less sensitive to vibrations due to turbulence in the wastewater. In addition, an air supply 15 is arranged on the outlet pipe, which air supply can create an air pocket in the bend, so that by continuous supply of air through the air nozzle into the pipe 7, a continuous air flow is created out through the opening 13. This air flow out through the opening 13 prevents , that sludge-containing wastewater enters the outlet pipe during aeration or filling in the chamber 2. In this way it is ensured that only purified water is sucked through the outlet valve 12.

In FIG. 4, an alternative embodiment is illustrated in which a taper 16 is provided on top of the bend of the outlet valve 12, the taper must be of such a size that sludge particles cannot settle on top of the outlet valve 12 during the sedimentation process. In the example shown, an air supply 15 is arranged inside the pipe, so that it will also not be possible for the sludge to settle on a possible air supply connection on the outside of the pipe.

By providing an outlet valve in this way, where there is no possibility of sedimentation of sludge either on the top of the bend or on a possible supply connection, it is avoided that sludge is sedimented in the immediate vicinity of the outlet opening 13. This ensures that the water sample as typically taken from the tank 8 becomes representative of the total treated wastewater.

In FIG. 5 illustrates a cross-section A-A, where the bend of the outlet valve is made with a teardrop-shaped cross-section, so that the taper prevents any sedimentation of sludge particles or other contamination on the upper side of the bend.

7 DK 2003 00323 U3

REQUIREMENTS

Outlet valve, in particular for use in connection with water treatment, including particularly sludge-containing water, which valve is new in that a 180 ° bend is provided at the end of a substantially vertically placed pipe in a container, so that the open end of the pipe faces downwards, and that means are arranged on the highest part of the bend, whereby particles in the water cannot remain on the valve, and that an air supply is provided before the bend.

An outlet valve according to claim 1 which is new in that the means are a taper upwards.

An outlet valve according to claim 1, which is new in that the means are a pipe part which reaches above the liquid surface and which pipe part covers the largest part of the upper side of the bend.

An outlet valve according to claim 1, which is new in that the air supply in the form of a spigot is mounted on the pipe to form an air pocket in the bend.

The outlet valve according to claim 1, which is new in that the air supply is a hose or a pipe arranged inside the pipe of the outlet valve and with substantially smaller diameter than the inner diameter of the pipe.

Outlet valve according to claim 1, which is new in that the means are a deformation of the cross section of the pipe in the bend, so that the cross section is teardrop-shaped with the tip facing upwards DK 2003 00323 U3

DK 2003 00323 U3