JP2003260313A - Continuous filter press - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a continuous filter press in which a filter medium can be regenerated with respect to an apparatus by which raw water is filtered and concentrated continuously. <P>SOLUTION: A circular filter cylinder (3a) is hung on a drive shaft (4) suspended in the central part of an airtight tank (1). Filtrate tubes (12) suspended in several filtrate chambers (11) formed by dividing the cylinder (3a) by a plurality of partition walls (10) are connected to a rotary valve (19) fixed to the shaft (4). The valve (19) is brought into sliding contact with a fixed valve (13) externally put on the shaft (4). A filtrate discharging tube (20) and a washing water tube (21) arranged on the valve (13) are arranged oppositely on the rotational locus of the tubes (12) connected to the valve (19) so that each of the tubes (20) and (21) can be associated or disassociated freely with the tubes (12). The connection of each of the tubes (12) to the tube (20) or the tube (21) is changed so that each of the chambers (11) can be backwashed, namely, each block of the cylinder (3a) can be backwashed. In other words, raw water can be filtered continuously while the surface of the filter medium is regenerated. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for filtering raw water such as purified water, sewage, industrial water, or industrial wastewater, and a filter for concentrating sludge generated by these treatments. The present invention relates to a continuous pressure filter that enables regeneration.

[0002]

2. Description of the Related Art Conventionally, as a closed filter, there are devices such as a candle filter and a leaf filter. Further, a pressure filtration device in which a large number of cylindrical filter media are vertically suspended in a closed filtration tank is also well known, and a doughnut-shaped filter media is vertically suspended between the cylindrical filter media and the cylindrical filter media in the closed filtration chamber. A multi-cylindrical filter provided with a scraper to be brought into sliding contact with a filter material and a spiral blade for pushing a filter cake is known as described in, for example, Japanese Patent Publication No. 7-30095.

[0003]

The devices such as the candle filter and the leaf filter described above are of a batch type and therefore have a low filtration rate and are subject to restrictions on the target stock solution. In addition, the conventional multi-cylinder filter is capable of continuous filtration, has a high filtration rate, and has the feature of enabling large-capacity processing, but it is necessary to prevent clogging of the filtration surface and reduction of filtration capacity due to aging. Is difficult with a scraper. Even if the washing water is supplied from the filtrate outlet, the entire filter medium may not be washed due to the short path. In order to solve the above problems, the present invention provides a continuous pressure filter capable of regenerating the filter medium surface by cleaning the filter medium surface partitioned by partition walls block by block while performing continuous filtration. The purpose is to

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is that a filter cylinder is vertically provided in a cylindrical closed tank, and a stock solution is pressed into the closed tank to form a cake layer on the peripheral surface of the filter cylinder. In a filtration device that performs solid-liquid separation by allowing the filtrate to pass through the inside of the filtration cylinder, suspend the filtration cylinder on a drive shaft that hangs down in the center of the closed tank, and then suspend the filtrate inside the filtration cylinder. The pipe was connected to a rotary valve fixed to the drive shaft, the rotary valve was slidably contacted with a fixed valve externally attached to the drive shaft, and the filtrate discharge pipe and the washing water pipe arranged on the fixed valve were connected to the rotary valve. The filtrate pipe is installed opposite to the rotation path of the filtrate pipe, and the filtrate discharge pipe and the washing water pipe are connected to the filtrate pipe so that they can be freely disassembled. The filter cylinder is intermittently backwashed to regenerate the filter medium surface and continuously. It is possible to filter. Then, the filtration cylinder arranged in the closed tank is hung on the drive shaft as an annular filtration cylinder concentric with the closed tank, and the annular filtration cylinder is partitioned by a plurality of partition walls. A filtrate pipe is hung in the liquid chamber, and it is possible to discharge the filtrate and clean the surface of the filter medium for each block.

The construction of the fixed valve is such that the fixed valve is fitted on the top wall of the closed tank, and the filtrate discharge pipe and the washing water pipe are arranged on the fixed valve.
On the lower surface of the fixed valve, a filtration zone of an arcuate recess communicating with the filtrate discharge pipe and a backwash zone of an elliptical recess communicating with the wash water pipe are formed in the remaining part of the filtration zone, and the filtrate provided on the rotary valve It is installed opposite to the opening of the pipe, and by switching the backwash zone and filtration zone of the filter cylinder with a rotary valve and a fixed valve, intermittent backwashing of the filter cylinder is possible and continuous filtration is possible while regenerating the filter medium surface. Becomes Then, since a plurality of scrapers installed upright in the closed tank were slidably contacted with the peripheral surface of the annular filtration cylinder, it is possible to prevent clogging of the filter medium surface due to the cake layer and reduction of the filtration capacity,
A synergistic effect with washing can be obtained. Further, since the drive shaft is hung near the bottom of the closed tank and the rake is arranged at the lower end of the drive shaft, the concentrated sludge can be easily discharged.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION The continuous pressure filter according to the present invention is configured as described above, and the stock solution is press-fitted into the stock solution chamber of the closed tank, and the solid content is captured on the filtration surface of the annular filtration cylinder. To form a cake layer on the peripheral surface of the annular filtration cylinder, and the filtrate from which the solid content has been separated flows into the annular filtration cylinder due to the differential pressure. The circular filtration tube rotates together with the rotary valve, and when the base end of the filtrate pipe connected to the rotary valve is connected to the filtration zone communicating with the filtrate discharge pipe provided in the fixed valve, The filtrate in the liquid chamber is discharged from the closed tank. When the rotary valve is further rotated and the base end of the filtrate pipe is connected to the backwash zone that communicates with the wash water pipe provided in the fixed valve, air or wash water flows from the filtrate pipe into the filtrate chamber of the ring filtration cylinder. Is sprayed and backwashed from the back side of the filter medium to regenerate the filtration side. A scraper is slidably contacted with an annular filtration cylinder that rotates around a rotation axis, and the cake layer formed on the annular filtration cylinder is scraped off to prevent the filtering ability of the filtration surface from being reduced by the cake layer. While crushing the cake that has settled in the settling tank with a rake to make concentrated sludge, while preventing the stock solution from flowing out,
The concentrated sludge is discharged from the closed tank intermittently as appropriate.

[0007]

Embodiments of the present invention will be described in detail with reference to FIG.
Is a continuous pressure filter, and a filtration cylinder 3 suspended from a horizontal suspension rod 2 is disposed inside the closed tank 1, and the suspension rod 2 hangs down at the center of the closed tank 1. It is connected to the drive shaft 4. A stock solution supply pipe 5 is connected to a side wall of the closed tank 1, and the inside of the closed tank 1 serves as a raw water chamber 6. A lower portion of the closed tank 1 is formed into a conical shape to form a sedimentation chamber 7, and a sludge discharge pipe 9 is connected to a lower end portion of the sedimentation chamber 7 via an opening / closing valve 8.

FIG. 2 is a cross-sectional view of the closed tank. The filtration cylinder 3 arranged in the closed tank 1 is a circular filtration cylinder 3a which is concentrically arranged with the closed tank 1 and is doubled. The annular filtration cylinder 3a has a plurality of partition walls 1 with inner and outer peripheral surfaces as filtration surfaces.
Partitioned by 0 ... Forming a plurality of independent closed filtrate chambers 11. Then, the cake of the stock solution press-fitted into the raw water chamber 6 of the closed tank 1 is captured by the filtration surface of the annular filtration cylinder 3a, and the filtrate is caused to flow into the filtration chamber 11 of the annular filtration cylinder 3a.
As shown in FIGS. 1 and 3, filtrate pipes 12 are vertically provided in the filtrate chamber 11 of the annular filtration cylinder 3a, and the nozzles 25 disposed in the filtrate pipe 12 lead to the filtrate chamber 11. The inflowing filtrate is discharged.

FIG. 4 shows a switching device for discharging the filtrate and cleaning the filtration surface of the annular filtration cylinder 3a, in which a fixed valve 13 is fitted on the top wall of the closed tank 1 and driven by the closed tank 1. Axis 4
Is rotatably supported by the bearing 14 of the fixed valve 13. The lower end of the sprocket 15 fitted to the upper end of the drive shaft 4 protruding from the closed tank 1 is slidably contacted with the fixed valve 13, and the chain 16 wound around the sprocket 15 is interlocked with the rotary valve driver 17. . Reference numeral 18 is a sprocket 15
It is a presser spring for preventing slipping out. The rotary valve 19 is fitted on the drive shaft 4 near the top of the closed tank 1,
Is in sliding contact with the fixed valve 13. As shown in FIG. 5, the base ends of the respective filtrate pipes 12 ... Hanging in the filtrate chambers 11 of the annular filtration cylinder 3a are connected to the upper rotary valve 19, and the filtrate pipes 12 ... Has an opening 12a arranged on the upper surface of the rotary valve 19 on a concentric circumferential surface.

As shown in FIG. 4, a fixed valve 13 fitted to the top wall of the closed tank 1 is provided with a filtrate discharge pipe 20 and a washing water pipe 21, and as shown in FIG. Filtration zone A, which is an arcuate recess communicating with the filtrate discharge pipe 20 on the lower surface of the
In the remaining portion of the filtration zone A, a backwash zone B having an elliptical recess communicating with the wash water pipe 21 is formed. An alternate long and two short dashes line shown in FIG. 5 indicates an opening 1 of a filtrate pipe 12 provided in a rotary valve 19 opposite to the filtration zone A and the backwash zone B of the fixed valve of FIG.
2a, the filtration zone A and the backwash zone B on the lower surface of the fixed valve 13 are opposed to the rotation locus of the opening 12a of the filtrate pipe 12 provided on the surface of the rotary valve 19. Rotate the ring filter cylinder 3a together with the rotary valve 19 to remove the filtrate pipe 12
The filtrate in the filtration chamber 11 of the annular filtration cylinder 3a is discharged from the filtrate discharge pipe 20 to the outside of the closed tank 1 while sequentially switching the connection between the filtrate discharge pipe 20 and the filtrate discharge pipe 20 communicating with the filtration zone A.

Further, the rotary valve 1 together with the annular filtration cylinder 3a.
9 is rotated to bring the filtrate pipe 12 into the backwash zone B of the fixed valve 13.
To move. In this embodiment, the filtrate tubes 12 and 12 of the pair of filtrate chambers 11 and 11 of the annular filtration cylinder 3a that are doubly arranged.
The communication between the filtrate discharge pipe 20 and the filtrate pipe 12,
12 is connected to the washing water pipe 21 of the backwash zone B. Cleaning water or compressed air is sequentially ejected from the nozzle 25 of the filtrate pipe 12 into the filtrate chamber 11, and the plurality of filtration chambers 1 of the annular filtration cylinder 3a are
1 ... is divided into blocks and washed to regenerate the filtration surface of the annular filtration cylinder 3a. The discharge of the filtrate from the filtrate chamber 11 of the annular filtration cylinder 3a and the back washing of the filtration surface are repeated while rotating the annular filtration cylinder 3a.

As shown in FIGS. 1 and 2, the scraper 22 is provided on the inner and outer peripheral surfaces of the annular filtration cylinder 3a suspended on the suspension rod 2.
Are in sliding contact with each other, and the scrapers 22 are erected on a support rod 23 fixed to the lower inner peripheral wall of the closed tank 1. The cake layer captured on the filter medium surface of the circular filtration cylinder 3a is scraped off by the scraper 22 while rotating the circular filtration cylinder 3a, thereby preventing the cake layer from clogging the filter medium surface and reducing the filtering ability. The lower end of the drive shaft 4 hangs down to the bottom of the settling chamber 7, and the rake 24 is fixed to the lower end of the drive shaft 4.
The rake 24 is rotated to crush the cake that has settled in the settling chamber 7 into concentrated sludge, and the on-off valve 8 is opened as appropriate to discharge the concentrated sludge from the sludge pipe 9 while preventing the stock solution from flowing out.
This continuous pressure filtration device can also perform filtration in batch operation depending on the purpose of use.

[0013]

The continuous pressure filter according to the present invention is constructed as described above, and a plurality of filtrate pipes vertically provided inside the filtration cylinder are connected to the rotary valve and slidably contacted with the rotary valve. A fixed valve is connected to the filtrate discharge pipe and the washing water pipe, and the filtrate discharge pipe and the washing water pipe are joined to the filtrate pipe so that they can be freely disassembled. Alternatively, it is possible to switch to the connection of the washing water pipe, intermittently backwash the filter cylinder, and perform continuous filtration while regenerating the filter medium surface. Then, the filtration cylinder arranged in the closed tank is a concentric ring filtration cylinder concentric with the closed tank, and the washing pipe is hung in the filtrate chamber partitioned by the partition wall. It is possible to discharge and clean the filter medium surface.

The structure of the fixed valve is such that the fixed valve is fitted on the top wall of the closed tank, and the filtrate discharge pipe and the washing water pipe are arranged on the fixed valve.
On the lower surface of the fixed valve, a filtration zone of an arcuate recess communicating with the filtrate discharge pipe and a backwash zone of an elliptical recess communicating with the wash water pipe are formed in the remaining part of the filtration zone, and the filtrate provided on the rotary valve It is installed opposite to the opening of the pipe, and the rotary valve and the fixed valve are brought into sliding contact with each other to switch the filtration zone and the backwash zone,
By connecting the filtrate pipe to the filtrate discharge pipe and the washing water pipe, it is possible to wash each block while performing continuous filtration. Then, since a plurality of scrapers installed upright in the closed tank are brought into sliding contact with the peripheral surface of the annular filtration cylinder, it is possible to prevent clogging of the filter medium surface due to the cake layer of the annular filtration cylinder and reduction of the filtration capacity, and cleaning A synergistic effect is obtained. Further, since the drive shaft is hung down to the settling chamber and the rake is arranged at the lower end of the drive shaft, the cake is crushed into concentrated sludge, while preventing the stock solution from flowing out,
The concentrated sludge can be easily discharged from the closed tank.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a continuous pressure filter according to the present invention.

2 is a cross-sectional view of the continuous pressure filter taken along the line AA of FIG.

FIG. 3 is likewise an enlarged view of a filtrate pipe depending on a filtrate chamber of a ring filtration cylinder.

FIG. 4 is likewise an enlarged view of a switching device for connecting a filtrate discharge pipe or a washing water pipe to the filtrate pipe.

FIG. 5 is a plan view of an opening of a filtrate pipe arranged in the rotary valve.

FIG. 6 is likewise a bottom view of the filtration zone and the backwash zone arranged on the fixed valve.

[Explanation of symbols]

1 closed tank 3 filter tubes 3a Ring filter tube 4 drive shaft 10 partitions 11 Filtration chamber 12 Filtrate tube 12a opening 13 fixed valve 19 rotary valve 20 Filtrate discharge pipe 21 Washing water pipe 22 scraper 24 rakes A filtration zone B backwash zone

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 33/58 B01D 29/38 520C C02F 11/12 ZAB 520E

Claims (5)

[Claims] 1. A cylindrical closed tank (1) is vertically provided with a filtration cylinder (3), and a stock solution is press-fitted into the closed tank (1) to form a cake layer on the peripheral surface of the filtration cylinder (3). Filter cylinder (3)
In a filtration device for performing solid-liquid separation by passing a filtrate through the inside of a filter tank, a filter cylinder (3) is hung on a drive shaft (4) hanging from the center of a closed tank (1). ) Is connected to a rotary valve (19) fixed to the drive shaft (4), and a rotary valve (13) is externally attached to the drive shaft (4). 19) are slidably contacted with each other, and the filtrate discharge pipe (20) and the washing water pipe (21) arranged in the fixed valve (13) are connected to the rotary valve (19) to form a rotation locus of the filtrate pipe (12). Installed oppositely, the filtrate discharge pipe (20) and the washing water pipe (2
A continuous pressure filtration machine, characterized in that each of (1) and (2) can be connected to and detached from a filtrate pipe (12). 2. The filtration cylinder (3) is suspended from a drive shaft (4) as a circular filtration cylinder (3a) concentric with the closed tank (1), and the circular filtration cylinder (3a) is divided into a plurality of partition walls. While partitioning with (10), each filtrate chamber (1
The continuous pressure filter according to claim 1, wherein a filtrate pipe (12) is suspended in (1). 3. A fixed valve (13) is fitted on the top wall of the closed tank (1), and a filtrate discharge pipe (2) is attached to the fixed valve (13).
0) and the washing water pipe (21) are provided, and the filtration zone (A) of the arcuate concave portion communicating with the filtrate discharge pipe (20) is provided on the lower surface of the fixed valve (13), and the rest of the filtration zone (A). A backwash zone (B) of an elliptical recess communicating with the wash water pipe (21) is formed in the portion, and a filtrate pipe (1) provided in the rotary valve (19).
The continuous pressure filter according to claim 1 or 2, which is provided opposite to the opening (12a) of 2). 4. The plurality of scrapers (22) provided upright in the closed tank (1) are slidably contacted with the peripheral surface of the annular filtration cylinder (3a). Or 1
The continuous pressure filter according to item. 5. The drive shaft (4) is hung down to near the bottom of the closed tank (1), and a rake (24) is arranged at the lower end of the drive shaft (4). 4. The continuous pressure filter according to any one of 4 above.