JP2961442B2 - Continuous filtration device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous filtration device, and more particularly to a continuous filtration device for filtering muddy water generated when condensing dredged muddy water.

[Conventional technology]

Conventionally, various filtration devices have been used for filtering muddy water generated when the dredged muddy water is concentrated.

[Problems to be solved by the invention]

The continuous filtration device of the present invention comprises a cylindrical filter tank body, a mobile filter bed unit having a fixed filter bed and a plurality of mobile filter beds arranged adjacent to each other in the filter tank body, A mechanism for supplying treated raw water from the side of the adjoining moving filter unit and removing treated water from the side of the fixed filter bed, a backwash tank, and one moving filter bed constituting the moving filter unit is the backwash tank And a mechanism for moving said mobile filter unit such that another mobile filter bed is positioned adjacent to said fixed filter bed when positioned therein.

[Action]

In the continuous filtration device of the present invention, when the mobile filter bed adjacent to the fixed filter bed is clogged, the mobile filter bed is moved into the backwash layer and backwashed, and at the same time, it is juxtaposed with the mobile filter bed. Another unfiltered mobile filter bed is located adjacent to the fixed filter bed, and the treatment of the treated raw water is continued.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In the present invention, as shown in FIGS. 1 to 5, a cylindrical filter medium made of foamed resin and having a specific gravity smaller than water is filled into a cylindrical body 1 having a predetermined height at a flowable density. A fixed filter bed 3 is formed by closing the upper and lower openings 1 with a partition net 2, and a mobile filter bed unit 5 is formed by connecting two similar mobile filter beds 4 having a lower height to each other in the horizontal direction. The fixed filter bed 3 is fixed to the upper part of the upright cylindrical filter tank main body 6, and a holding portion for instructing the movable filter bed unit 5 to be movable in the lateral direction at an intermediate portion of the filter tank main body 6. 7, a muddy water inlet 8 is formed at the lower part of the filter tank main body 6, and a treated water drainage port 9 is formed at the upper part.
And a sedimentation section at the lower end of the filtration tank body 6.
10 is provided.

A backwash tank 11 is provided on both sides of the support portion 7, and a chamber 12 in which one mobile filter bed 4 can be stored is provided in the backwash tank 11.
An air pipe 14 for supplying air through a perforated pipe 13 provided on the lower side of the chamber 12, a backwash water outlet 15 provided on a lower part of the perforated pipe 13, and an upper side of the chamber 12 And a backwash water supply pipe 17 for supplying backwash water via a backwash water nozzle 16 provided in the moving bed unit. An extruding mechanism 18 is provided to allow the other mobile filter bed 4 to be extruded into the chamber 12 in the backwash tank 11 when 4 is positioned adjacent to the fixed filter bed 3.

In the continuous filtration apparatus of the present invention, the muddy water which is the raw water for treatment is supplied from the muddy water inlet 8, and the sedimentable substance precipitates in the sedimentation section 10 at the lower part of the main body of the filtration tank. The substance that hardly settles passes upward in the order of the moving filter bed 4 and the fixed filter bed 3 and is captured in the filter medium.

The treated water subjected to the filtration treatment is discharged from the treated water discharge port 9 at the upper part of the main body of the filtration tank.

After passing water for a certain period of time, one of the mobile filter beds 4 of the mobile filter unit 5 in which clogging becomes the largest due to this is slid sideways by the pushing mechanism 18 and moved into the chamber 12 of the backwash tank 11, and the other. The moving filter bed 4 that is not clogged is moved to the lower part of the fixed filter bed 3. During this time, the water flow does not stop,
The filtration function is continuous.

Backwash water is supplied from the backwash water supply pipe 17 through the backwash water nozzle 16 to the mobile filter bed 4 moved into the chamber 12 of the backwash tank 11 due to clogging, and a hole is formed from the air pipe 14. Pipe 13
By supplying air through the filter, the granular filter medium in the moving filter bed 4 is fluidized, and the substance trapped in the filter medium is peeled off.
After washing, prepare for the next filter bed change. The water used for washing is withdrawn from the backwash water outlet 15 at the bottom of the backwash tank.

The substance precipitated in the sedimentation section 10 at the lower part of the filter tank body is appropriately pulled out from the sedimentation discharge port 19.

Since the fixed filter bed 3 is also clogged with use for a long time, a perforated pipe 13 and a backwash water nozzle 16 similar to those in the backwash tank 11 are provided at the lower and upper ends of the filter tank body 6, respectively. It is preferable that the fixed filter bed 3 and the movable filter bed 4 located in the filter tank main body 6 are provided so that the backwash can be performed at the positions.

〔The invention's effect〕

Since the continuous filtration device of the present invention has the above configuration, it has the following effects.

By continuously removing the clogged mobile filter bed from the main body of the filtration tank through the water and supplying a washed mobile filter bed instead, continuous filtration can be performed.

Since no extra filtration tank is required for backwashing, the processing equipment can be made compact.

When treating high-concentration wastewater with a filtration device, the time until clogging is short, and backwashing has to be performed frequently, but in the continuous filtration device of the present invention, water flow and backwashing are performed in parallel. Therefore, it is possible to cope with high-concentration wastewater treatment without time loss.

Since the filter medium is washed in a dedicated backwash tank, the washing efficiency is high and the amount of water required for washing is small.

In addition, when it is intended to obtain clear residual water using a conventional sedimentation and concentration tank, the processing capacity is usually ^{2 to} 5 m ³ / h per 1 m ^{2 of} water area, but a granular filter medium is used as in the above example. The upflow filtration device has a processing capacity of 10 to 20 m ³ / h.

However, it is a matter of course that ordinary filter media may be used.

Also, the filtration tank body 6 can be set to be horizontal instead of standing upright.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional front view of the continuous filtration device of the present invention, FIG. 2 is a sectional view taken along line AA, FIG. 3 is a sectional view taken along line BB, FIG. FIG. 5 is a plan view thereof. 1 ... tubular body, 2 ... partition net, 3 ... fixed filter bed, 4 ...
Mobile filter bed, 5: Mobile filter bed unit, 6: Filter tank body, 7: Holding part, 8: Muddy water inlet, 9: Treated water drainage port, 10: Sedimentation part, 11: Backwash Vessel, 12 …… Room, 13 ……
Perforated pipe, 14… Air pipe, 15… Backwash water outlet, 16… Backwash water nozzle, 17… Backwash water supply pipe, 18
…… Extrusion mechanism.

Continuation of the front page (56) References Japanese Utility Model 50-115275 (JP, U) Patent 2761805 (JP, B2) Japanese Patent Publication No. 53-26861 (JP, B2) (58) Fields investigated (Int. Cl. ⁶⁾ B01D 24/00-24/48 B01D 41/02

Claims (2)

(57) [Claims] 1. A mobile filter unit comprising a cylindrical filter tank main body, a fixed filter bed and a plurality of mobile filter beds arranged adjacent to each other in the filter tank main body, and adjacent thereto. A mechanism for supplying treated raw water from the side of the moving filter bed unit and removing treated water from the side of the fixed filter bed, a backwash tank, and one moving filter bed constituting the moving filter unit are provided in the backwash tank. A mechanism for moving said mobile filter unit so that another mobile filter bed, when positioned, is adjacent to said fixed filter bed. 2. A mechanism wherein at least the moving filter bed is made of foamed resin and has a granular filter medium having a specific gravity smaller than water, the filter tank main body is upright, and the backwash tank supplies air from below. The continuous filtration device according to claim 1, further comprising a mechanism for supplying backwash water from above.