SU1321690A1 - Arrangement for waste water flotation treatment - Google Patents

Abstract

The invention relates to wastewater treatment plants and can be used in the treatment of domestic and industrial wastewater, the extraction of minerals from liquids in the chemical, petrochemical and other industries. The purpose of the invention is to increase the performance of the device while reducing the space it occupies. The device comprises a case of column type 1 with vertices upward installed inside it with a gap to the case and between them flat O)

Description

bone elements 2 are conical in shape, each of which has a coaxial overflow threshold 3 and flanging 4 with holes (cutouts) 5. The gai-fluid-mixture flows through conduit 6 and through holes 7 pours out onto the surface of the conical elements

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The invention relates to the treatment of wastewater and can be used in the treatment of domestic and industrial wastewater, the extraction of minerals from liquids in the chemical, petrochemical and other industries.

The purpose of the invention is to improve the performance and reliability of the device while reducing the space occupied by it.

Figure 1 shows the device, a longitudinal section; figure 2 is the same horizontal cut; fig.Z - node I in figure 1; figure 4 is a device with conical elements, in which the flanging edges are located higher and farther from the axis of the housing than the edges of the overflow thresholds, an option; in FIG. 5, the same horizontal section; figure 6 - node II in figure 4.

A device for flotation sewage treatment comprises a case 1 of column type with planar elements 2 of conical shape installed inside it, each of which has overflow threshold 3 coaxial to the case and flange 4 with openings (cutouts) 5, pipeline 6 for supplying gas-liquid mixture located - a base column and provided with openings 7 placed above the conical elements 2, pipes 8 for discharging purified water, having openings 9, and pipes. 10 for Drainage of sludge. The folding of 4 conic elements is made in two versions. In the first embodiment, it is made bent (figure 1) in the direction of the axis of the body so that its edge is located lower and closer to the axis of the body than the edges of the overflow threshold. In the second embodiment (FIG. 4), the flanging of the elements is carried out2. Flanging 4 elements 2 allows to keep a thin layer of liquid in which the separation of contaminants by flotation occurs. Purified water is discharged through the openings through pipes 8, and flotation plumes through pipe 10. 2 hp, f-crystals, 6 sludge.

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it is located on the rectangular and edge of it, and is further from the axis of the housing 1, than the edges of the overflow threshold 3 and the upper edges of the openings of the pipes 8 of the discharge of purified water. Flanging 4 conical elements 2 in the places of the holes (cut-outs) 5 is inserted in the holes 9, pipes 8 of the discharge of marked water.

The device works in the following way.

The fluid, pre-saturated with air, is turbulent in the supply line 6, is poured out on the surface of the conical elements 2 through the openings 7. Flanging the 4 elements 2 makes it possible to retain a thin layer of liquid where flotation separates the contaminants. The treated liquid, the passage through hydraulic locks formed by the flanging edges and overflow thresholds (Figures 1 - 3) or the flanging and the upper edges of the holes 9 (Figure 4-6), rushes along the flanging to the holes (cutouts) 5 in them and Next through holes 9, it is discharged through pipes 8, which serve as a support unit for the device at the same time.

To evenly distribute the liquid over the elements 2, overflow thresholds 3 are used. The foam forming during the cleaning process spontaneously moves along the inclined surface of the water along the formed conical elements through the flanging 4 into the segment 01 bodies formed by the column body, flanging the conical elements and pipes 8, and then it flows down along the inner surface of the housing, significantly dehydrating to the lower part of the device, from where it is discharged through pipe 10 to the outside of the apparatus. Through the holes 7 on pipropro3132

water 6 can be periodically washed in cases where sediment accumulates on elements 2.

The conical elements shown in FIG. 3, provide a more efficient removal and removal of the frothy product from the surface of the water being purified than the elements shown in FIGS. 4-6. This is due to a more meltable shear of the upper liquid layer — the foam, which, almost without obstacles, goes beyond limits of elements 2 of the construction of the first type. However, elements 2 of the design of the second type are much easier to manufacture and also quite effectively provide for the removal and removal of foam.

In comparison with the known volumetric type flotation machines, the proposed device has a large (1.4 - 2.5 times) specific performance while reducing the occupied areas.

The proposed design provides an effective implementation of the flotation process in a thin layer (1-3 cm), the specific productivity of the working area which is 6 - 7 times higher with the same cleaning effect than the flotation carried out in bulk flotation units. In this device, it is possible to bring the ratio of the working area — thin layers, where flotation takes place (1–3 cm layer height), and auxiliary zones, where liquid is supplied and the float slurry and purified water are drained to 1: 3–1: five. This, even with the same height of apparatuses of known and proposed structures, provides a higher (1.4-2.5 times) specific performance of the total volume of the latter. At the same time, an increase in the height of the working zone in a volumetric-type floater does not lead to an increase in the apparatus’s performance. whole Increasing the height of the device of the proposed design provides a directly proportional increase in its production.

water content, which opens up more possibilities for B sharply operating the flotation devices.

In addition, the device provides high reliability in operation, since it does not contain moving parts.

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Claims (3)

1. A device for the purification of wastewater I, containing a casing and pipelines for supplying a gas-liquid mixture, draining purified water and flotation sludge, which is characterized by the fact that, in order to reduce the performance and reliability of the device while reducing the space it occupies, columns with vertices upward mounted inside it with a gap to the body and between them conic shaped coaxial elements, which have an overflow threshold at the periphery of the top coaxial with the body and a screening with a hole mi, and the gas-liquid mixture supply pipeline is located along the axis of the body and there are holes in it located above the conical elements, pipelines for discharging purified water are installed inside the case along its periphery, holes are made in them, into which the conical elements are flanged at the points of their holes, the pipeline A flotation dump is located in the lower part of the hull. 2. The device according to any one of the preceding claims is that the flanging of the conical elements is made curved in the direction of the housing axis so that its edge is located and closer to the axis of the body edge of the overflow threshold. 3. A device according to claim 1, characterized in that the flanging of the conical elements is rectangular and its edge is located above and further from the body axis, the edges of the overflow thresholds and the upper edges of the openings of the pipes for the discharge of purified water. FIG. Compiled by G. Meskhi Editor N. Gunko Tehred A. ..-:. Order.2717 / 16 Circulation VNIIPI State Committee CCLF for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5 Pass the water on grafy es oepredy Uzhgorod, st. Project, 4 6