FI74694B - ANORDINATION FOER LUFTNING AV VATTENDRAG ELLER AVFALLSVATTEN. - Google Patents

Description

74694

Device for aerating water or sewage

The invention relates to an apparatus for aerating wastewater from water bodies, such as ponds or resuscitation ponds. The apparatus comprises at least one water supply line floating on the water, which is anchored to opposite shores, e.g. by means of a rope, and from which branch aeration devices injecting water into the water at a certain distance from each other, consisting of an air-carrying, e.g. hanging and connecting it to the candle.

Such an apparatus is disclosed in DE Patent Publication No. 2,834,899. In the solution according to the publication, the inlet ducts which conduct air to the kvnt-15 spaces and are suspended from the air supply line are rigid metal pipes. The apparatus introduces air into the water in a fine bubble form to maintain or remove stagnant water from the biological equilibrium or by using resuscitation tanks 20 for the biological treatment of wastewater.

When such a wastewater treatment pool is put into operation, the pool is first partially filled with normal water and the equipment is installed by several men in place, with the candles standing at the bottom and the inlet lines oblique due to the low water-25 surface. The equipment is heavy and difficult to handle when installed, so the candles on the bottom or their connections are often damaged. In addition, there is a risk that the supply lines of the parallel-supplied air supply lines Vinos-30 sa will stick to each other. For these reasons, it is difficult to bring such equipment into a sewage treatment plant.

If such equipment is used to aerate a pond or lake, there are often sludge liners at the bottom of the body of water 35 into which candles attached to rigid inlet lines are drilled and clogged so that no air is actually taken to the points where air intake would be particularly important. As such, it would be possible to use correspondingly shorter inlet pipes in the area of sludge mountains. Due to the high cost, it is difficult to replace the inlet pipes in the water. Besides, the 5 candles would be too far from the mountain after the partial unloading of the sludge mountains and no longer in a favorable operating position.

Additional difficulties often arise when a pond or lake freezes and water is drained in winter. In this case, the ice-10 cover loads the inlet pipes in such a way that these often curved and the candles at the bottom of the pond are damaged.

Thus, in view of the difficulties described, such devices are suitable only to a limited extent for the aeration of ponds or lakes, at least at the highest cost they must be adapted to the actual conditions.

The object of the invention is to improve the apparatus as described at the beginning so that it can be easily installed and generally used without complicating its operation.

The device according to the invention is characterized by the features mentioned in the characterizing part of claim 1.

The invention greatly simplifies the installation of the equipment in a wastewater treatment tank that is only partially filled. Flexible hose inlets bend at low water levels without pressing heavily on the 25 candles resting on the bottom. Moreover, it is possible to place such equipment in a dry sewage treatment tank even at the time of installation and then to fill the pool with water without damaging the parts of the equipment.

The invention also has the advantage that the device can be used without difficulty for the ventilation of ponds and lakes, even when there are sludge mountains at the bottom of the water body. The candles of the apparatus according to the invention are placed on the surface of the sludge liners without penetrating into them. As a result, the candles are not clogged either, but can continue to operate without es-35 tea. When the sludge mountains are gradually discharged, the 74694 candles resting on the surface of the mountains simply descend and thus always remain in the favorable operating position.

Also, when a pond or lake equipped with such equipment freezes in winter and the water is drained, there is no danger to the equipment because the flexible hose lines do not transfer the weight of the ice cover to the candles at the bottom of the pond.

In addition, a particular advantage is that corrosion-resistant plastic can be used to make flexible hose lines, so that even corrosive wastewater does not shorten the life of such flexible hose lines.

When aerating wastewater in a resuscitation tank, it is necessary to let the air out as evenly as possible over the entire area of the resuscitation tank. With the known apparatus 15, in which the inlet ducts suspended in the air supply pipe are rigid metal pipes, movable aeration pieces arranged parallel to the air supply pipe are periodically reciprocated by the outflowing air in the bottom area The reciprocating movement of the air supply pipes spaced in parallel at a predetermined distance achieves a large-scale and efficient treatment of the wastewater and the resuscitation sludge therein.

25 As a result of that reciprocal movement in particular, this type of equipment has a decisive advantage over previous equipment used for the same purpose. The unanimous opinion of the experts was that the the precondition for achieving the movement was the use of rigid air inlet pipes. Namely, when the apparatus operates in the longitudinal direction of the air inlet pipes, a certain lifting force acts, and when the air inlet pipes are slightly inclined, the horizontal component of this force produces the desired displacement movement. However, it was assumed that the resiliently suspended aeration members 35 would only move to the side or float and said transmission would not occur.

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Surprisingly, however, it turned out that this was not the case, but that this displacement movement of the air supply pipes also occurs when the inlet lines are a flexible hose. It turned out that a small rise in the water surface on the 5 sides of the floats, where the air bubbles leaving the .1 air body rise in each case, is sufficient to achieve the desired lateral movement. What was amazing was that the small rise in water caused by the bubbles rising from the candles alone was enough to cause a lateral movement. The movement also arose when the spring-10 inlet pipe was bent due to the existence of a sludge mountain, for example, and a small rise in water occurred a short distance from the float. Even when the aeration pieces touch the bottom, this desired movement is achieved. Also in this case, there is a reversal on the reversal-15 lines of the air supply pipes, which would have been impossible when using rigid metal flag pipes as input lines. This advantage is of great importance for the cooperation of the mobile air supply pipes, as it prevents the chains from getting stuck in the obstacles. Namely, entrapment to obstacles leads to a breakdown of the biological balance, e.g. as a loss of resuscitation sludge. The invention has thus decisively improved the use of mobile air supply pipes.

Furthermore, when flexible pipes or hoses are used as inlet lines, the aeration equipment is considerably simplified and reduced in price, since commercially available hoses, preferably made of plastic, can be used. This advantage is particularly significant in situations where the length of the supply lines can only be determined at the point of use, so that they can simply be shortened when the hoses are used.

30 Such a situation often occurs, for example, when installing equipment in natural waters.

The invention makes it possible to replace or clean partially blocked or damaged floor aerators without difficulty, simply by lifting up the serviceable parts 35, which is clearly made possible by the flexible hose line.

It is particularly advantageous if each flexible inlet line is easily releasably attached at its ends by means of 74694 clamping rings or quick connectors to the air supply line or to a candle connected thereto. By means of the invention, it is possible to adapt the equipment to changing conditions simply by changing the input line quickly 5 and without high costs. When venting ponds or lakes, it is also possible to first use shorter inlet lines in an area with high sludge mountains and simply switch the inlet lines to longer ones as the sludge mountains are continuously discharged.

10 It should be noted that more air comes out of a shorter inlet line than candles with longer inlet lines. A choke can be installed in the area of the supply line of the air supply line, which rigidly or adjustably reduces the inlet to the candle. In this way, candles that depend on longer inlet lines can be reduced or even temporarily closed without the introduction of air into the candles of shorter inlet lines, i.e. in the area of the discharge sludge mountains, and the sludge mountains discharge much faster.

An embodiment of the invention will now be described with reference to the drawings. The figures show: Fig. 1 is a side view of a part of the air supply pipe with the aeration devices dependent thereon, Fig. 2 is a schematic top view of a resuscitation basin equipped with a water purification device, and Fig. 3 is a longitudinal section of the basin along line III-III.

Figures 2 and 3 show schematically an apparatus 30 1 for the biological treatment of waste water 2 in a resuscitation sludge basin 3. The pool of the example is a ground pool, as can be seen from Figure 3. This underground can have a bottom line 15 as a resuscitation sludge for wastewater treatment, so that in this case near-bottom aeration is guaranteed.

35 However, the bottom does not have to be flat, but it can also be like the bottom of a pond or a lake.

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In the example shown, the basin is provided with three air supply lines 5. Each air supply line consists of successively arranged pipe sections and T-pipes 7 placed between them, which are tightly connected to the hose sections by hose clamps or quick-connectors.

At the end of each air supply line is a rope or chain 16 by means of which each air supply line is anchored to piles 8 placed on the edge of the pool or on the shores. Thus, each air supply line represents an aeration chain 4 of different parts, which is not always tightly tensioned between the piles 8, but the air supply lines are kept so loose that they can be in a large arc between the two piles placed on the shorter rectangular sides of the ground, such as 15 is shown in Figure 2.

The other end of the air supply lines 5 is connected to the supply line 9, through which air is supplied to the air supply lines from the compressor 10.

Between the two hose parts of the air supply line 5, there is an aeration device marked as a whole with the reference number 6-20, whereby all aeration devices are placed at a regular distance from each other.

As can be seen from Figure 1, each aeration device 6 is formed by a T-tube 25 connected between both hose parts, which is provided with a float 11.

The vertical connection 17 of each T-tube 7 injects downwards into the water. Attached to the connection 17 is the upper end of the inlet line 12 of the flexible hose. In the drawn example, the end of the inlet pipe 12 is further pushed together on top 17 and fixed by means of a hose clamp 14. It is also of course possible to connect the upper end of the input line 12 to a connection 17 with a quick connector, e.g. a bayonet connector.

In the illustrated embodiment, the lower end of the inlet line 12 is inserted over one 18 of the air-35 piece of air 35 in the form of a ceramic candle and is fixed to the inlet line by means of a hose clamp. Here, too, a quick connector, e.g. a bayonet connector, could act as a connector for the lower end of the supply line 12 to the ceramic candle 13.

The aerator body 13 is arranged parallel to the air supply line 5. It is a porous material through the pores of which air comes out in a fine bubble and 5 divides into water. Usually such aeration bodies are in the form of ceramic candles. They consist of a tube of porous ceramic metal, the ends of which are closed so that the air introduced by the overpressure is forced out of the fine pores.

Figures 2 and 3 show such an apparatus consisting of a plurality of air supply pipes 5 mounted in a sewage basin. Aerator chains receive their lateral propulsion from the air blowing so that they begin to move periodically back and forth within the available range of motion. Figure 2 shows two end positions for the right aerator chain, namely the left end position with intact lines and the right end position with a dashed arc.

When the aerator chain reaches the end line, the aerators, which are arranged slightly backwards at an angle of 20 to the air supply line, pivot under the line and force the air chain back in the other direction.

For example, in the connection 17 of the T-pipe 7, a choke can be mounted so that the air supply through the inlet line 12 is rigidly or adjustably reduced. The choke can also be 25 automatically adjustable, as this is an air volume control.

By using a flexible hose inlet line, it is possible - as shown above - e.g. to discharge the sludge liners.

In this connection, the candles may be provided with downing tools or abrasion protection on the underside. Thanks to the hose inlet cables, the risk of getting caught is virtually eliminated.

Under certain conditions, it is sufficient for the inlet line to be formed into a flexible hose in only one plane perpendicular to the longitudinal direction of the air supply pipe.

Claims (5)

8 74694 A device for aerating water bodies, such as ponds or sewage sludge ponds, comprising at least one floating air supply line anchored by means of a rope, e.g. to opposite shores, and branched at a distance from each other by venting devices injecting water, each consists of an aerating body for conveying air, for example in the form of a ceramic candle, and an inlet line suspended from and connected to the air supply line, characterized in that the inlet line (12) is a flexible hose. Device according to Claim 1, characterized in that the air supply line (5) is branched at regular intervals by pipe connections (17), to each of which a supply line (12) is removably attached, for example by means of clamping rings (14). Device according to Claim 2, characterized in that a pipe connection (18) branches off from each candle (13), to which the inlet line (12) is detachably attached, for example by means of clamping rings (14) or known quick connectors. Device according to one of Claims 1 to 3, characterized in that there is a choke in the region of the inlet line of the air supply line (5) which rigidly or adjustably reduces the air supply to the candle (13). Device according to one of Claims 1 to 4, characterized in that the inlet line is formed as a flexible hose only in one direction perpendicular to the longitudinal direction of the air supply line (5).