SU1565812A1 - Flotation plant - settler and scraper device for removal of sediment - Google Patents

Abstract

The invention is intended for the treatment of wastewater containing suspended substances with a high degree of polydispersity and improves the cleaning efficiency by improving the hydrodynamic conditions of settling (excluding downward and upward flows, sediment sediment). Flotopen from foam trays with hinged-connected undercutting knives enters the rotating hollow foam-holding ring and out of it through vertical pipes into the rotating annular pipe, where it mixes with sediment. From the foam retaining ring, the rotation is transmitted through the vertical pipes and the annular pipe to the scraper. It is made in the form of a pipe having a spiral perforated surface and a longitudinal slit for suction of sediment. The pipe is connected to the annular pipe. The auger transports the sludge into the annular tube, from where it, together with the flotation foam, enters the rotating chamber to collect the sludge and is removed through the sludge duct. Through the perforated surface, the filtrate is squeezed out into the casing, which is siphoned off. The perforated surface is cleaned with rubber plates attached to the turns of the screw. In the zone of settling thin-layer shelf elements are installed. 2 sec. apt. 6 hp f-ly, 7 ill.

Description

The invention relates to devices for the treatment of natural wastewater and recycled water, mainly wastewater containing suspended solids with a high degree of polydispersity.

The purpose of the invention is to increase the efficiency of water purification and the performance of a scraper device to remove sludge.

FIG. 1 shows a flotation settler with a scraper device for removing sludge, a section; FIG. 2 is the same, in plan view, in FIG. 3 shows section A-A in FIG. one; FIG. 4 is a view B in FIG. 1) in FIG. 5 - the same, plan B; in fig. 6 is a sectional view BB in FIG. four; in fig. 7 - section G-Y in FIG. four.

The flotation tank contains a cylindrical body 1, an initial water supply system consisting of a supply pipe 2 and a water distribution bowl 3, an annular aerator 4 with a filter nozzle 5 attached to the bowl 3, a device for collecting float foam, a scraper device for removing sediment and Purified water drainage system - gutter 6.

The device for collecting flotopenes is made in the form of trays 7 mounted on a rotating central support 8 tangentially to its cylindrical surface. With the longitudinal edges of the chutes 7, the wedge undercutting knives 9, which are made with foam 10 to ensure zero buoyancy, are hingedly connected.

The trays 7 are connected to a hollow foam-retaining ring 11, which through vertical pipes 12, an annular pipe 13 and radial nozzles 14 is connected to an annular sediment collection chamber 15 mounted rotatably with respect to the water distribution bowl 3. A discharge pipe is connected to the sediment collection chamber 15 sixteen.

Radial thin-layer shelf elements 17 are installed between the vertical pipes 12 and the wall of the cylindrical body 1.

The device for removing sediment contains a hollow scraper in the form of a pipe.

18 with a spiral perforated surface 19 and a longitudinal hole 20. The pipe 18 is connected to an annular pipe 13 by a mating device 21. In the pipe 18 there is a screw 22, between the turns of which elastic elements are fixed - rubber plates 23 attached to the perforated surface

19 tubes 18. The screw 22 is installed in the under-bearing supports 24 and is connected from the outside to the roller 25 through a ball-and-socket coupling 26.

The pipe 18 is installed in the casing 27, Has a longitudinal hole, combined with a longitudinal hole 20 in the pipe 18. On the wall of these holes is fixed rubber plate 28. On the casing 27 is fixed hollow tapered pocket 29 filled with foam 30. The casing 27 is connected to the siphon 31, Knee which is lowered into the catchment 6.

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The drive of the device for collecting foam and removing sediment consists of a gearmotor 32 and a helical gear - a gear wheel 33 and a pinhole 34, mounted on the foam retaining ring 1 1.

Flotation settler works as follows.

The source water to be purified is fed through conduit 2 to the water distribution bowl 3. Leaking from bowl 3, the water passes through an air barrier created by a ring aerator 4 with a filter nozzle 5, during the passage of which the compressed air is crushed into tiny bubbles. At the same time, water is aerated and light soils, together with air bubbles, float up and form a layer of flotopenes bounded by a foam retaining ring 11.

From gear motor 32, through gear wheel 33 and chuck 34, rotation is transmitted to foam retaining ring 11 with trays 7 and wedge undercutting knives 9. Since knives 9 have zero buoyancy, the depth of their receiving edges changes when the water level fluctuates, which allows flotation in trays 7 and then in the foam retaining ring 1 1 and prevents water from entering it. Installing trays 7 tangentially to the neutral support 8 facilitates the spontaneous movement of the flotopenes into the cavity of the foam retaining ring 11, from where it enters the annular pipe 13 through vertical pipes 12.

Water from the flotation zone passes between the vertical pipes 12, spreads in the sedimentation zone in a direction close to the horizontal, and the passage through the thin-layer elements 17 is lightened. Heavy fractions fall onto the sloping walls of the shelf elements 17 and crawl, and the clarified water is collected by the drainage chute 6, from which it is diverted to further purification.

The precipitate that fell to the bottom of the flotation tank is removed by a scraper device. The rotation of the scraper tube 18 is transmitted from the foam retaining ring 11 through the vertical pipes 12, the annular pipe 13 and the pendulum device 21.

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The outer part of the scraper is supported on the roller 25, rolling along the bottom of the settling vessel. While the hollow pocket 29 with the foam 30 reduces the load on the roller 25 due to buoyancy, and also reduces the resistance to movement of the scraper and prevents soaking of sediment due to its conical FORM. Scraper design

the device is designed in such a way that when a foreign object gets under the scraper, it can move upwards due to the hinge coupling 26 and the pendulum device 21.

When moving the scraper sediment under the action of the hydrostatic column

the liquid enters the pipe 18 through the longitudinal hole 20. In this case, the plate 28 intensifies the sediment soaked up into the pipe 18. Rotation of the roller 25 causes the screw 22 to rotate, which transports the precipitate along the entire length of the pipe 18 to the ring pipe 13, where it mixes with the flotation foam, which and allows it to be removed from the settler flotation cell. From the annular pipe 13, the precipitate with flotation through the radial nozzles 14 enters the sediment collection chamber 15, from where it is withdrawn through the pipeline 16.

When the sludge is moving, the filtrate is pushed through pipe 18 through the spiral perforated surface 19 into the casing 27, from where it is removed using a siphon 31. During the rotation of the screw 22, the spiral perforated surface 19 is cleaned by rubber plates 23 pressed against it fixed between the turns of the screw.

The invention makes it possible to increase the efficiency of wastewater treatment by improving the hydrodynamic conditions of sedimentation (absence of descending and ascending flows, agitating sludge), reliably removing flotopenes mixed with sludge, and highly productive removal of dehydrated sludge from the entire bottom of the flotation tank.

Claims (6)

1. Flotator-settler, containing a cylindrical body, systems for supplying initial water and discharging purified water, foam-retaining ring, mounted on a central rotating support device for collecting flotopenes Q s 0 5 0 . 0 with about five 126 and a scraper device for removing sediment, an annular sediment collection chamber with a circulating pipeline, characterized in that it is equipped with an annular aerator located in the central part of the housing, the flotopena collecting device is made in the form of trays connected to a foam retaining ring, which is made hollow and communicates through vertical pipes with the sludge collection chamber, while the scraper of the device for removing sediment is made hollow with a longitudinal hole and connected to the ring Eve sludge collection chamber, rotatably mounted relative to the vertical axis of the housing. 2. The flotation settler according to claim 1, characterized in that it is provided with thin shelf elements radially mounted between the vertical pipes and the wall of the housing. 3. Flotation settler in PP. 1 and 2, characterized in that the trays of the device for collecting flotopenes are located tangentially to the rotating central support. 4. Flotation settler in PP. 1-3, characterized in that the trays of the flotopena collecting device are provided with wedge-shaped undercutting knives having zero buoyancy that are hinged at their longitudinal edges. 5. A scraper device for removing sediment, containing a hollow scraper with a longitudinal hole and driving a scraper, characterized in that, in order to improve the performance of the device, the scraper is made in the form of a pipe with a spiral perforated surface, the device is equipped with a screw installed with rotation in the pipe elastic elements fixed between its turns and in contact with the perforated surface of the pipe, located outside the pipe with a casing with a longitudinal hole, combined with the extension nym hole scraper. 6. The device according to claim 5, characterized in that it is provided with a siphon connected to the casing. / 7 / 7 FIG. 2 nineteen 23 JO Rig. 6 18 22 FIG. 7