SU1468403A3 - Apparatus for continuous filtration of liquids - Google Patents

Abstract

A process for continuously filtering liquids, the liquid flowing upwards on a downwardly movable granular filter medium, expediently a sand bed, and the filtered liquid being continuously discharged from the liquid space present above the filter medium. In a process of this type, in particular, the speed of the filter medium is to be improved and the washing is to be separately controllable, in order to ensure as a result an adequate regeneration. This is ensured according to the invention in that the filter medium saturated with filtrate at the base of the granular bed is conducted at a controlled rate through vertical transport pipes and is raised above the liquid bed by the controlled part-stream passed into the transport pipes from the untreated liquid entering into the filter section, then, separated from the transport liquid, is returned by gravity to the upper part of the filter bed, the filter medium being washed in countercurrent with the aid of filtered liquid conducted upwards by passing through air, and the contaminated washing liquid being discharged together with the transport liquid.

Description

J

about

00 liK

Ltd

cm

to form an adjustable gap 23, a nozzle 16 for draining the filtrate and a nozzle 18 for draining the washing liquid. The fluid to be cleaned moves from bottom to top, the loading - from top to bottom, then goes along the pipe of the airlift 4 into the washing space 11

The invention relates to devices for the purification of liquids by filtration and can be used for the treatment of wastewater.

The purpose of the invention is to increase the efficiency of fluid cleaning and regeneration of the load.

The drawing shows the device, a longitudinal section.

The device consists of a cylindrical or rectangular body 1 with a bottom 2, which may have the form of a truncated cone or a truncated pyramid filtering granular behind the load 3, located vertically along the axis of the body of the airlift pipe 4 to move the load: attached to the pipe from the outside a distribution element, cone-shaped wave-shaped 5 and pipe 6. Cone-shaped guide elements 7 and 8 are used to evenly move the layer. The washing device consists of pipes 9 and 10 installed in the upper part of the body; forming the washing space 11. Under the washing device there is a chamber 12 with gaps 13 and a valve 14 for controlled air distribution, which serves as a means for controlling the flow rate A of the washing liquid.

The means for supplying the liquid to be purified is the guide element 7, which has a device 15 for the air-conditioning device. A nozzle 16 with a leading edge 17, which serves to drain the filtrate, and a nozzle 18 with an overflow edge 19, which serves to drain the wash water, are located in the upper

housing parts. „„ -

In the lower part of the housing there is a means for adjusting the speed AND, regenerated, is distributed over the volume of the housing by the cone 5 and the tube 6. Depending on the load contamination, the speed of its movement is controlled by changing the gap 23 and supplying the cleaned fluid through the lines 34, 35. zp f-ly, 1 ill.

Particle flow, made in the form of a container 20 connected to the bottom of the bottom 2 from its external stack and communicating with the means for supplying liquid through the valve 21, and the pipe 22 installed with the possibility of vertical reciprocating movement with the formation of the gap 23 with the lower end 24 of the pipe 4 airlift. At the same time, in the upper part of the container 20, holes 25 are made with shielding plates 26, and pipe 22 has an opening 27 for partially introducing the liquid to be cleaned, controlled by a valve 28, and a valve 29.

The guide plates 30 are attached to the inner walls of the pipe 4 of the airlift.

Above the tank 20, an air distributor 31 is installed with a slit 32 and a control valve 33.

The device works as follows.

in a way.

A stream of crude liquid through line 34 is fed through guide element 7, equipped with an air removal device 15, and flows upward towards a moving downstream flow of granular filtering charge and is cleaned. The filtered liquid is removed through the nozzle 16. The flow of the purified liquid, adjusted by the valve 21, enters the tank 20 and then through the adjustable gap 23 together with the loading into the rail 4 of the airlift and flows along it upwards. The displacement of a saturated load of contaminants is facilitated by the flow of the unpurified liquid, the flow rate of the loading load can be regulated by the size of the gap 23, it can be set

By moving the tube 22, the load-loaded grains saturated with the delayed impurities are pushed into the tube 4 towards the guide plates 30, partially cleaned of impurities and get into the washing space II, where they are finally cleaned with washing liquid A flowing upward under the action of air flow through the chambers 13 of the chamber 1 are 12. The cleaned load is evenly distributed along the volume of the body by the cone 5 and the pipe 6. The contaminant containing liquid, which consists of the transporting stream B of liquid and the washing liquid A STI fed into the pipe 9 is removed via the overflow edge 19, the nozzle 18.

When moving a hardly movable contaminated filtering material, the gap 23 is reduced to a minimum and through pipe 22 through the opening 27 a partial flow of the cleaned liquid is adjusted, adjusted by the valve 28. In this case, the flow G of the liquid only through the openings 25 enters the filtering layer and, moving downwards, contributes the movement of grains in the pipe 4 airlift,

When the blockage occurs at the bottom of the device, the layer can be loosened by supplying air through line 35 through distributor 31 with slot 32.

In this case, it is advisable to feed the bulk of the crude liquid to the bottom of the layer by shutting off the flow of liquid along line 34 through tank 20.

If necessary, the load can be removed from the case by opening the valve 29.

Claims (4)

Invention Formula . A device for continuous filtration of liquids, comprising a cylindrical or rectangular case with a bottom in the form of inverted whiskers 0 five 0 five 0 five 0 or pyramids, granular filter loading, vertically along the axis of the body of the airlift pipe, distribution elements attached to it from the outside, guide elements and flushing device, means for supplying the cleaned fluid, located in the lower part of the body, removal means filtrate and wash liquid with overflow edges, located in the upper part of the body, air inlet and means for adjusting the speed of the washing liquid and the flow of particles of the filter head narrow, so that, in order to increase the efficiency of cleaning the fluid and regenerating the load, it is equipped with a chamber for distributing air with oA slits located under the washer, and means for controlling the flow rate of particles the filtering load is made in the form of a container in communication with the means for supplying the cleaned fluid and connected to the bottom of the bottom from the outside of the pipe, installed with the possibility of vertical return of the atomic displacement with the formation of a gap knim airlift pipe end. 2. The device according to claim 1, which repeats with the fact that in the upper part of the chamber there are holes with shielding plates. 3. The device according to claim 1, characterized in that the pipe installed with the possibility of vertical reciprocating movement has an opening on the lateral surface — partial injection of the fluid being cleaned. 4. The device according to claim 1, wherein it is necessary so that guide plates are attached to the inner walls of the airlift pipe.