DE7523481U - DEVICE FOR THE OXIDATION OF ACTIVATING SLUDGE - Google Patents

Description

Home,. 8000 Munich 40,

Frelllgrathstrafle 19 IM-J l ^ J'n Li B i. Elsenaeher StraOe 17

P.O. Box ι « Dipi.-ing. η. π. eanr p «i..Am»

Dlpl.-Phys. Eduard Betzier rJm ^ mr. » ^Jo « 510M Dipl.-Ing. W. Herrmann-Trentepohl ^M »»

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Bahrpatente Herne PAT EN TA N WA LT E Babetopat Munich

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Bayerische Verelnabank Munich 952 Dresdner Bank AQ Herne 7-520 499 Postscheckkonto Dortmund 668 68-467

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Munich

SOCIETE DEGREMONT

183, avenue du 18 Juin 1940

Rueil Malmaisoan (France)

Device for the oxidation of activated sludge

The innovation relates to a device for the oxidation of activated sludge for the biological purification of urban areas and commercial wastewater.

When cleaning wastewater that is loaded with organic substances in suspension or in solution, using It is known of activated sludge processes that are used to develop and circulate the suspended in the water to be purified biological flora requires the supply of samplers with air diffusers or surface aerator! perform.

The distributors of air or of oxygen-enriched gases in the form of fine bubbles offer the advantage that with they can achieve a high degree of efficiency in terms of oxidation, but have the disadvantage that they are higher Installation costs occur.

Surface aerators are less effective, but they turn out to be

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in terms of investment than economic. They are also less adaptable than the distributors for. Air introduced under overpressure with the distribution of oxygen in the different basins one with Activated sludge working plant.

In fact it is the case that in a cleaning system that works with activated sludge, several basins arranged one behind the other or one basin divided into several compartments are present - this is the case when one has a multi-stage ventilation, a subsequent stabilization of the sludge in a contact basin as well as a series of treatments, such as regeneration of the sludge, contact and sludge digestion - with surface aerators proving difficult to use because metric engines are required to work in the various Basin to ensure a different ventilation performance. If you use a single motor, you can a single shaft drive several aerators, but so that the aerators have a different ventilation performance, they must not be at the same speed revolve, which requires a very complicated and expensive arrangement.

Devices for surface aeration generally use arrangements which can be rotated about a vertical or a horizontal axis, which hurl the liquid with the activated sludge into the atmosphere and intensively circulate the water to be cleaned with the biological flakes. Such revolving aerators work at circumferential speeds in the order of magnitude of 2 to 20 m / s; It is also known that the specific oxygen supply, expressed in kg O ₂ / kWh, decreases with the peripheral speed. It is therefore important to use surface aerators which are driven sufficiently slowly via a reduction gear, taking into account that

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this should not result in an unsustainable increase in investment or inadmissible exploitation difficulties.

The device according to the innovation makes it possible to eliminate these disadvantages; due to its conception comes the innovation according to the device to the surface aerator and on the one hand provides the distribution of the liquid in the Ambient atmosphere safe, but on the other hand, like air diffusers, allows the introduction of bubbles. the The device according to the innovation is simple and inexpensive in terms of investment and use. Above all the inventive device enables an adjustable, multi-stage oxidation performance in the successive Basin, requiring only a single mechanical drive device.

The inventive device for the oxidation of activated sludge has at least one cylindrical frame, which revolves around an essentially horizontal axis at very low speed and partially into a Cleaning bags with activated sludge are immersed, whereby the cylindrical frame at least one layer on its circumference of prefabricated, slightly open at their ends elements in the form of lines, the main extent of which runs in the horizontal direction and in which when passing through the atmosphere collects air or an oxygen-enriched gas, so that with each revolution of the cylindrical frame with progressive immersion of the elements in the liquid with the activated sludge, the release of the in the lines collected air takes place to generate bubbles.

In an advantageous embodiment of the device according to the invention, the circumference of the circumferential cylindrical Frame arranged prefabricated elements for each frame

has a constant cross-section and a length that is approximately 5 to 20 times larger than their cross-section. Here you can

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several layers of such elements can be arranged on the periphery of the frame, against each other and on their axial support are attached and thus form hollow cylinders, the wall of which has a substantially constant thickness. The cross section this element is constant in the individual frame, but can change from one frame to the other and one have any shape, the largest cross section being on the order of 3 cm to 15 cm.

In a further embodiment of the device according to the invention, several cylindrical frames are different Diameters and lengths are arranged on the same axis of rotation and are controlled by a single reduction gear put into circulation without the need for additional gears, such an embodiment allows ventilation with multi-level performance. Due to the fact that the elements are made of the same material and only on the individual Frames have to be arranged, the device proves to be easy to maintain and presents no difficulties when replacing defective elements.

The prefabricated, lightweight elements arranged on the circumference of the cylindrical frame preferably consist of Plastic; on their outer wall they can have perforations of the order of 3 mm to 20 mm, which likewise air or oxygen-enriched gas can penetrate and exit and thus also the oxidation capacity improve the device.

Further developing features and advantages of the device according to the invention are to be found in the following on the basis of the description of exemplary embodiments of the innovation and are explained with reference to drawings.

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In Fig. 1 is a schematic representation of a longitudinal section and in Fig. 2 is a schematic representation of a cross section the device according to the innovation can be seen in the simplest embodiment, which has a single circumferential cylindrical Has frame 1 to which prefabricated, lightweight elements 2 are attached, for example made of plastic. A reduction gear 3 drives the axis of rotation of the frame 1 at a very low speed, the peripheral speed in the Of the order of 5 cm / s to 50 cm / s. The device is partially immersed in a cleaning basin 4 with activated sludge one, which sewage and return sludge is fed at 5 while the purified water exits at 6.

3 and 4 are details of the prefabricated elements and their arrangement on the cylindrical frame 1 can be seen; the cross-section of these elements can be triangular, circular or any other shape, the largest being Cross-section is on the order of 3 cm to 15 cm. In the horizontal direction, the elements point substantially larger dimensions.

In FIG. 3, elements can be seen which have layers of plastic that are glued together, one layer 7 running in a corrugated manner, while the other layer 8 is rolled up around the frame. The length of the elements is adjustable, but is in the range between 30 cm and 1 m. The length of these elements is specified in such a way that at a low speed of rotation of the device, the discharge of air and water from the lines does not completely discharge the air from the beginning of the immersion of the elements in the liquid with activated sludge, so that the air escaping from each cycle during immersion emerges in increasingly finer bubbles.

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In another embodiment of the innovation according to FIG. 4, the elements 9 have a cylindrical shape with a circular shape Cross-section and can be provided with ribs. These Elements are arranged in several interconnected annular layers.

With each revolution of the device, the lines that are open at their ends are emptied; foreign bodies that may be present exit completely through these openings and there is no risk of silting up. The sprinkling of the water also results in surface aeration.

Finally, it should be noted that due to the large contact area and the low speed of this Elements a biological film forms on these, which is also parallel to the effect of that contained in the basin Activated sludge is an effective way to purify the water.

In Fig. 5 is a schematic representation of a device according to the innovation when used in a conventional travel ( Cleansing system with activated sludge can be seen, which has an aeration basin 10 with a single compartment and a sludge collecting basin 11 has, from which part of the decanted sludge via a line 12 and a pump 13 for mixing with the wastewater is returned to the aeration basin. In the tank with activated sludge, concentrations of more than 10 g / l can be achieved.

When using a device according to the innovation in a purification plant for urban wastewater with an oxygen requirement (DB05; BOD ₅ ) of 150 mg / 1 to 300 mg / 1 within 5 days, it is possible to reduce the energy consumption by 200 to 300 watts per kg of water Reduce oxygen demand in 5 days,

-7-

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the rate of degradation being of the order of 90 % .

In order to avoid any undesirable build-up of sludge on the walls of the basin, the rotating cylinder is preferred with chains not shown or with cleaning shovels provided, which allow the renewed supply of sludge in suspension.

6 is a schematic representation of innovations according to the invention Devices 14a can be seen in a basin 14 with several compartments 14b, the devices 14a from one single drive device in circulation and by a single reduction gear by means of a common axis are driven. This enables a different oxidation according to the requirements in the individual compartments, which is a great advantage.

In this way, the oxidation of several or even of all affected basins in the most complicated cleaning processes with activated sludge to clean the water or to stabilize the sludge. The simplicity of the facility is as evident as its considerable Advantages offered by the device in terms of utilization and maintenance of the equipment, all the more so more than the same material is used to manufacture the various hollow cylinders with different oxidation performance which has already been pointed out above.

In Fig. 7 a schematic plan view of a cleaning system of a further embodiment can be seen. A basin 15 has five interconnected compartments 15a, ..., 15e. The one made of water and mud circulated together existing mixture flows progressively through the compartments 15a-15e of the basin 15. Since the oxygen demand from the upstream wärtigen to the downstream end decreases, may above

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of the container a number of from a common Einric " device driven device can be used, with the oxidation performance of each individual device in this Series arrangement from the upstream end to the downstream The end is decreasing.

As shown in the embodiment illustrated in Figure 8 Anordnur ■. recognizable, the required oxidation capacities in the regeneration compartment 16 for sludge, in the multi-stage feed basins 17, 17a, 17b for water or in the secondary clarifier 18 with a series of devices of the same design but different performance, but always provided by one and the same device are driven.

Quite generally, in a given system, a series is created depending on the particular oxygen demand of the system provided by devices that have the same conception and a common drive device for all individual devices have, but the oxidation performance is adapted to the respective requirements.

Protection claims; - 9 -

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Claims (1)

- 9 claims for protection iy device for the oxidation of activated sludge in one Waste water purification plant, characterized in that the device has at least one cylindrical frame around a substantially horizontal axis revolves at very low speed and partially in a cleaning tank with activated sludge immersed, the cylindrical frame on its periphery at least one layer of prefabricated, on their Has ends slightly open elements in the form of lines, the main extent of which runs in the horizontal direction and in which it is when passing through the atmosphere Air or an oxygen-enriched gas flows in such a way that with each revolution of the cylindrical frame as it progresses Immersion of the elements in the liquid with the activated sludge results in the release of that collected in the pipes Air takes place with the generation of bubbles./ 2. Apparatus according to claim 1, characterized in that the lines formed by the elements are arranged on the circumference of the circumferential cylindrical frame and have a cross section of any shape but constant size. j 3. Apparatus according to claim 1 or 2, characterized in that the lines consist of a flat plastic layer and a corrugated plastic layer / 4. Apparatus according to claim 1 and 2 or 1 and 3, characterized in that the individual frames one behind the other are arranged and driven by a single device which acts on a common axis. - 10 - 7523481 oz.01.76 -ιοί. Device according to one or more of the preceding ^ .. * Claims, characterized in that the cylindrical elements provided with the elements acting as lines Frame have different diameters. 6. Plant for the treatment of wastewater unt r the use of aeration devices, with a plurality of oxidation basins, which has a number of devices according to one or more of claims 1 to 5, which are driven by a single drive device and the respective requirements according to a different oxidation performance exhibit. Sdiutzanspr. r It. Bl. ·. « deleted 7523481 01/02/76