SU1176911A1 - Clarifier-thickener for cleaning water - Google Patents

Description

The invention relates to devices for the mechanical treatment of various (natural, waste and recycled) water and can be used, for example, in the pulp and paper and chemical industries for the clarification of waste water containing suspended solids with a high degree of polydispersity.

The purpose of the invention is to improve the performance of the clarifier-thickener and the efficiency of clarification.

FIG. 1 shows a schematic clarifier-thickener, general view, in section; in fig. 2 is a view A of FIG. 1 (combined plan with a cut); in fig. 3 - section B — B in FIG. one; in fig. 4 — node 1 in FIG. one.

The clarifier thickener comprises a housing 1 divided by an airtight bottom 2 into an upper buffer chamber 3 and a lower clarification chamber 4. In the buffer chamber 3 there is a hydrocyclone 5 with a drain nozzle 6 and a nozzle 7 for supplying liquid, blocks of inclined flat shelves 8, a raking device 9, and a pit 10 for collecting sludge.

In the upper part of the chamber 3 there is a peripheral collecting chute 11, on the inner wall of which overflow holes 12 are made, and bypass pipes 13 are attached to its bottom, ending with conical sockets 14 installed under the intermediate sealed bottom 15.

Over the intermediate sealed bottom 15 is installed annular perforated collector 16 to collect the clarified water and the pipe 17 to remove it from the clarifier-thickener. In the hermetic bottom 15 there are installed sludge removal pipes 18, which have a movable part 19, which is located above the bottom 15 and is made with notches 20 and with a cup-shaped bell 21, covering the end of the sludge disposal pipe.

Under the intermediate hermetic bottom 15 there is a slime sealing chamber 22, in the wall of which circumferentially located self-cleaning slotted filters consisting of stationary ring-shaped elements 23 interconnected by a holder 24, movable ring-shaped elements 25 mounted on the support bar 26, the rotor 27, rotated drum, recruited from round rods 28.

Attached to the stationary annular elements 23 is a chamber 29 for collecting the filtrate with a nozzle 30 for discharging it into the annular manifold 31. In the lower part of the slurry chamber 22, a raking device 32 is installed to transfer the sediment to the pit 33 and the nozzle 34 to remove it from the thickener clarifier.

The device works as follows.

Purified water with a suspended matter content of up to 20000 mg / l with their increased degree of polydispersity through the pipe 7 enters the switchgear having a hydrocyclone 5 located inside the buffer chamber 3.

In the pressurized hydrocyclone 5, the jet, moving along a helical spiral along its wall, is directed to its conical part. Here the main flow changes the direction of movement and moves to the central part of the apparatus. The sediment precipitated in the near-wall zone is removed, and the most saturated with suspended solids part of the water is removed to the pit 10. The stream of partially clarified water (suspended matter content decreases to 10,000 mg / l) in the central zone of the apparatus moves in a cylindrical spiral up to the discharge nozzle 6 and further to buffer chamber 3 with blocks of inclined shelves 8 for thin-layer deposition.

Suspended particles are deposited on inclined flat shelves and slide along them to the bottom of the 2 buffer chambers, from where the sludge formed is removed by the raking device 9 into the pit 10.

When liquid flows out of the hydrocyclone drain nozzle 5 into the buffer chamber 3, dissolved air is released from the liquid in the form of microbubbles with a diameter of 0.01-0.05 mm, which, attaching to substances suspended in water, carry them into the foam layer. When filling the chamber 3, the foam layer is further distributed, the foam layer can be removed from the chamber, for example, using a movable tray, and the liquid that is partially clarified to a content of 1000 mg / l of suspended solids, passing through the overflow holes 12 located on the inner wall of the groove 11, it is collected in it and further along the bypass pipes 13, which end in conical sockets 14, enters the lower chamber 4 for further purification.

The number of overflow pipes is chosen so that the liquid exits from the conical sockets with the speed necessary to form a layer of a weighted filter above the intermediate sealed bottom 15.

Liquid passing through this layer is clarified up to 5 mg / l by suspended matter content.

Excess suspended sediment is collected by sludge removal pipes in sludge packer 22, where under the action of hydrostatic pressure, the liquid is separated from the sludge and removed through the annular gaps of the self-cleaning slot filter formed by stationary ring-shaped elements 23 and moving elements 25 into the annular manifold 31. Formed 1176911

The underlayer mixes and is simultaneously discharged from the working surface of the self-cleaning slotted filter with the carrier plate 26 to the bottom of the slit compactor 8id A

another chamber 22, and with the raking device 32 the sediment moves into the pit 33 and further through the nozzle 34 is removed from the clarifier-thickener.

2 b-6

Fig.Z

1176911

FIG!

Claims (1)

Brightener Binder for water purification, comprising a housing divided by a hermetic bottom into a clarification chamber and a slurry-sealing chamber with a raking device, a switchgear, a ring collector of clarified water, sludge-removal pipes and branch pipes for supplying source water and draining clarified water, characterized in that the purpose of improving the performance of the clarifier-thickener and the efficiency of clarification, it is equipped with self-cleaning slit filters installed in the wall of the slurry chamber according to its a buffer chamber with a collective peripheral chute, the inner wall of which is made with overflow holes; the bottom of the chute is equipped with overflow pipes with conical sockets installed under the airtight bottom, the switchgear is installed in the buffer chamber and made in the form of a hydro cyclone with drain nozzle, and sludge removal pipes are made with the possibility of regulating their height with holes on the side surface and are equipped with cup-shaped _β caps and located above the lower part of the sludge pipe. - phage / ^ 4 WITH > 33 32 1176911