RU215601U1 - Device for centrifugal flotation wastewater treatment - Google Patents

Abstract

The utility model is intended for wastewater treatment from suspended solids and can be used in mechanical engineering, oil and oil refining industry, construction industry. SUBSTANCE: device for centrifugal-flotation wastewater treatment contains a cylindrical-conical body with an air pipe, an internal drain pipe, a foam collector chamber in the upper part of the body. The inner drain pipe is movable with blades along the side surface in the area of the tangential fluid supply, and in the area of the foam collector chamber there are blades and a tangential nozzle for removing foam sludge, coinciding with the direction of rotation of the blades. The rotation of the internal drain pipe is provided by a thrust bearing in the upper part of the body, above the blades. The blades along the side surface of the drain pipe are made of helical ones with a rotation vector upward along the axis of rotation. The clean water outlet is located in the upper part of the body, in front of it there is a reflective visor. The lower part of the drain pipe has a filter mesh and a reflective skirt. EFFECT: improving the quality of wastewater treatment. 4 w.p. f-ly, 4 ill.

Description

The utility model relates to wastewater treatment plants from suspended solids and can be used in mechanical engineering, the oil and oil refining industry, and the construction industry.

Devices are known for the purification of polluted wastewater from suspended solids using centrifugal forces and flotation processes, which are implemented sequentially in various apparatuses. For example, in the diagram of Fig. 6.12, p. 158 (book "Engineering protection of surface waters from industrial effluents", textbook / D.A. Krivoshein, P.P. Kukin, V.L. Lapin et al. / M .: Higher school, 2003 - 344 p.), the water is separately saturated with air in the saturator, and then the water is sent to the flotation chamber, where the water is purified, and the raking mechanism removes the foam in the foam collector. In the same source, in Fig. 6.13, page 162, the foam from the flotation chamber is directed by a fan to the cyclone, where the liquid and gas phases are separated. In all these devices, the implementation of the cleaning process requires several sequentially located units, which takes up a lot of production space and causes significant material and economic costs.

A device is known (author's certificate No. 789403 dated 23.12.1980, Bull. No. 47) "Installation for flotation wastewater treatment", in which the source water enters the hydrocyclone under pressure, acquires a spiral-rotational motion. Due to this movement along the axis of the hydrocyclone, an air column is formed, in which the pressure is lower than atmospheric pressure, and atmospheric air is sucked in (ejected) there. This device is accepted by us as a prototype. The disadvantages of the prototype are as follows: the removal of flotation foam from their flotation chamber is carried out by gravity and enters the flotation chamber. Removal of foam sludge by gravity does not provide complete cleaning of the flotation cell. In addition, uniform air saturation of the liquid inside the upward flow is not ensured. To eliminate the noted shortcomings and improve the quality of cleaning, a centrifugal-flotation wastewater treatment device is proposed, containing a pressure hydrocyclone with an air pipe, a cylindrical-conical body, an internal drain pipe, a foam collector chamber, in which the internal drain pipe is made movable with blades along the side surface in the tangential supply zone liquid, and in the area of the foam collector chamber there are blades and a tangential nozzle for removing foam sludge, coinciding in direction with the direction of rotation of the blades, while the rotation of the inner drain pipe is provided by a thrust bearing in the upper part of the housing above the blades, and the blades along the side surface of the drain pipe are made of screw rotation vector up along the axis of rotation, and the clean water outlet pipe is located in the upper part of the body, and in front of it there is a reflective hood, and the lower part of the drain pipe has a filter mesh and a reflective skirt.

To achieve this goal, the device shown in the drawings has been developed.

Fig. 1 - installation, general view;

fig. 2 - section of the foam collector;

fig. 3 - section of the inner branch pipe-flotation machine;

fig. 4 - node I,

where 1 - housing, 2 - reflector visor, 3 - purified water pipe, 4 - foam sludge outlet, 5 - thrust bearing, 6 - foam collector blades, 7 - top cover, 8 - air tube, 9 - foam collector top cover, 10 - foam collector body, 11 - upper bottom of the body, 12 - source liquid supply pipe, 13 - flotation inner pipe, 14 - flotation blades, 15 - mesh, 16 - skirt, 17 - bottom bottom, 18 - sludge discharge pipe.

The proposed device is a cylindrical-conical body 1, having in the upper part of the body of the foam collector 10, above which there is the upper cover of the foam collector 9 and the upper bottom of the body 11. The lower part of the body 1 has a bottom bottom 17, equipped with a sludge outlet pipe 18. 7 passes the air tube 8. Inside the body 1 around the pipe 8 is an internal branch pipe-flotation 13, which is movable and can rotate in the thrust bearing 5, located in the upper bottom of the body 11, on the annular shelf. The branch pipe-floater 13 rests on the bearing 5 with an annular protrusion, above which the blades of the foam collector 6 are located in the area of the body of the foam collector 10. Tangentially to the body of the foam collector 6 there is a branch pipe for removing foam sludge 4, installed in the direction of coincidence with the rotation of the blades 6.

Under the bearing 5, on the branch pipe-floater 13, there are flotation blades 14, having a curvature in cross section, which coincides with the source liquid supply vector through the branch pipe 12, located on the housing 1. The flotation vanes 14 in the longitudinal direction are elements of the auger blades located along the vertical axis of the flotator 14, starting from the upper section, where the nozzle for supplying the initial liquid 12 is located. At the same time, the tangential fluid supply through the nozzle 12 is located so that the impact on the blades 14 causes not only the rotation of the nozzle 13 around the vertical axis, but also the effect of screwing up along the axis. This creates two positive actions. Firstly, the screwing effect helps to significantly relieve the axial forces acting on the bearing 5, and, secondly, the repulsion of water in them contributes to a more intensive ejection of pollutant particles to the inner wall of the housing 1 and sliding of the slag to the nozzle 18. In the lower part of the flotation nozzle 13 its walls are mesh 15, which creates additional filtration. A skirt is installed around the lower cut of the flotation pipe 13, which prevents the ingress of pollutant particles into the flotation cavity from the sliding sludge along the lower bottom 17.

To drain purified water, in the upper part of the body 1 there is a branch pipe 3, in front of which there is a protective visor-reflector 2, representing the ingress of sludge and air bubbles into the branch pipe 3.

The proposed device works as follows.

The initial wastewater contaminated with suspended solids enters tangentially under pressure into the nozzle 12. The flow rate and supply pressure are selected so that an air flow is formed in the center of the pipe, in which the air pressure is lower than atmospheric pressure. The air column is formed in the air pipe 8. Flowing into the body 1, the water twists in a spiral and the particles of pollutants are thrown to the inner wall of the body 1 under the action of centrifugal forces. , causing it to rotate in bearings 5. The helical structure of the blades 14 causes an intensive sliding of the sludge layer along the wall of the housing 1 to the bottom 17 and its removal through the nozzle 18. The reduced pressure in the air pipe 8 causes air to be sucked from the atmosphere. The ejected air enters the ascending water flow in the space of the inner branch pipe-flotation 13, and in the form of ascending bubbles rises to the upper part of the branch pipe, carrying with it small and medium particles of contaminants that were not involved in the process of being thrown to the wall of the housing 1 by centrifugal force. Part of the small and medium particles of pollutants is retained on the filter mesh 15, from where it is washed away by ascending bubbles. The flotation sludge rising through the flotation nozzle 13 enters the body of the foam collector 10, where the blades 6 rotate, fixed on the nozzle 13. When rotating, the blades 6 entrain the flotation foam into the nozzle 14, the location of which is tangential to the rotation of the blades. The skirt 16 located in the lower part of the flotation pipe 13 prevents the ingress of sludge particles from the pollutant layer sliding down.

Purified due to the action of centrifugal forces, flotation and filtration, the water enters the purified water outlet 3 and is discharged to the consumer. The ingress of sludge particles and air bubbles into the nozzle 3 is limited by the visor-reflector 2.

Thus, the use of the proposed device makes it possible to improve the quality of wastewater treatment, significantly simplifying the design of the equipment.

Claims (5)

1. A device for centrifugal flotation wastewater treatment, containing a cylindrical housing with an air pipe, an internal drain pipe, a foam collector chamber in the upper part of the housing, characterized in that the inner drain pipe is made movable with blades along the side surface in the area of the tangential fluid supply, and in in the area of the foam collector chamber there are blades and a tangential nozzle for removing foam sludge, coinciding with the direction of rotation of the blades. 2. The device for centrifugal flotation wastewater treatment according to claim 1, characterized in that the rotation of the inner drain pipe is provided by a thrust bearing in the upper part of the housing above the blades. 3. The device for centrifugal-flotation wastewater treatment according to claim 2, characterized in that the blades along the side surface of the drain pipe are made of helical ones with rotation vectors upward along the axis of rotation. 4. The device for centrifugal flotation wastewater treatment according to claim 1, characterized in that in the upper part of the body there is a clean water outlet pipe, in front of which there is a reflective visor. 5. The device for centrifugal flotation wastewater treatment according to claim 3, characterized in that there is a filter mesh in the lower part of the drain pipe, and a reflective skirt on the lower section of the pipe.

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