JP2003190712A - Turbidity substance removing apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a turbidity substance removing apparatus (A) constituted so that a plurality of filter media (4) each comprising a core and a turbidity substance capturing material provided to the periphery of a core string in a projecting state are fixed between the supports (2) and (3) arranged up and down in a column (1) in a suspended state by the hanging strings (7) and (8) provided to both ends of the filter media so that the filter media are pressed to one support at the time of passage of raw water to be brought to a dense state and released from the dense state at the time of passage of washing water to form a coarse state and improved so as to achieve the extension of a water passing time. <P>SOLUTION: Opening parts (91) are provided between a plurality of the filter media (4) within a range wherein the turbidity capturing material is present at the time of passage of raw water and the opening part (92) of the base ends thereof is provided with turbidity substance concentrated liquid extraction pipes (9) communicating with the outside of the column (1) in the same direction as the filter media (4). <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a suspended matter removing apparatus.

[0002]

2. Description of the Related Art As a device for removing suspended solids (turbidity) in raw water, for example, a core string between support bodies arranged above and below the inside of a tower and a suspended matter trapped on the circumferential side of the core string are trapped. A plurality of filter media made of a filter material are pressed against one of the supports when the raw water is passed by the hanging strings at both ends of the filter media to form a dense state, and when the wash water is passed, the dense state is released to form a rough state. A suspended matter removing device which is fixed in a suspended state so as to obtain is effective.

However, in the case of the above turbidity removing device, there are drawbacks that the water passage time is short and the treated water recovery rate is low, especially when high turbidity raw water is passed, and in order to solve such a drawback. Requires a larger device.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a core cord and a circumferential side of the core cord between supports arranged above and below the inside of a tower. A plurality of filter media made of suspended matter trapping material are pressed by one of the supports when the raw water is passed by the hanging strings at both ends of the filter media to form a dense state, and when the wash water is passed, the dense state is released. It is an object of the present invention to provide a turbidity removing device which is fixed in a suspended state so that a rough state can be formed, and which is improved so that the water passage time can be extended.

[0005]

That is, the gist of the present invention lies in a range in which the turbidity trapping material is present between a plurality of filter media in the above-mentioned turbidity removing device during raw water passage. A turbidity removing apparatus is characterized in that a turbidity concentrate extracting pipe, which is provided with an opening and whose base end opening is connected to the outside of the column, is arranged in the same direction as the filter medium.

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings. 1 and 2 are schematic explanatory views of a preferred example of the turbidity removing apparatus of the present invention in which raw water is supplied in a downward flow format and washing water is supplied in an upward flow format,
FIG. 3 is a schematic explanatory view of a cross section taken along line III-III of the suspended matter removing apparatus shown in FIG.

The suspended matter removing device (A) shown in FIGS. 1 and 2.
Is a turbidity removal device in which raw water is supplied in a downward flow format and washing water is supplied in an upward flow format. Therefore, the tower (1)
A raw water supply pipe with a valve and a washing wastewater discharge pipe are provided at the top of the tower, and a treated water discharge pipe with a valve, a wash water supply pipe, and an air supply pipe are provided at the bottom of the tower (1). . In the apparatus shown in FIGS. 1 and 2, the pipes used in the raw water treatment operation and the cleaning operation are common, and the water flow direction is changed by the valve operation.

That is, in the case of the raw water treatment operation shown in FIG. 1, only the valves (61) and (62) are opened.
Raw water containing suspended matter is supplied from the valve (61) into the tower (1) via the pipe (51). At this time, the filter medium (4)
Shows a consolidated state as described later, and the suspended matter entrained in the raw water is captured by the filter medium (4). The treated water containing no suspended matter is discharged from the valve (62) via the pipe (52).

On the other hand, in the case of the washing operation shown in FIG. 2, the valves (61) and (62) which were in the open state during the raw water treatment operation were used.
Is closed, and washing water is supplied from the valve (64) to the pipe (5
It is fed into the tower (1) via 2). On the other hand, air is supplied from the valve (63) into the tower (1) via the pipe (53). The filter medium (4) is released from the compacted state as described later, and suspended matter is removed from the filter medium (4). The bubbling action of air causes the filter medium (4) to vibrate,
Peeling of suspended matter adhering to the filter medium (4) is promoted. The washing water containing suspended matter passes through the pipe (51) and the valve (65).
Emitted from.

An upper support (2) and a lower support (3) are disposed inside the tower (1), and a plurality of filter media (2) are provided between the upper support (2) and the lower support (3). 4) is fixed in a suspended state by the upper hanging string (7) and the lower hanging string (8) at the end of the filter medium.

The structure of the upper support (2) and the lower support (3) is not particularly limited so long as it does not impede the passage of water and the filter media (4) can be fixed by the hanging strings (7) and (8). There is no limitation, and for example, a lattice structure, a perforated structure, a stitch structure, or the like can be appropriately adopted.

The filter medium (4) is composed of a core cord and a turbidity trapping material protruding from the peripheral side of the core cord. The core string of the filter medium (4) and the upper hanging string (7) and the lower hanging string (8) are configured to be bendable and deformable along the flowing direction. Such a configuration is
This is achieved by selecting the type, shape and thickness of the material.

Each of the above elements is usually made of a synthetic resin material such as polyester, nylon or polyvinylidene chloride. Further, as each of the above-mentioned cords, in addition to various cords obtained by braiding, twisting, knitting, weaving, bundling, combing or cutting, single yarn (monofilament) may be used as long as it has sufficient strength. Can be done. The shape of the suspended matter capturing material of the filter medium (4) is usually a film piece or a thread. An example of the filter material (4) is a filter material in which a myriad of thread-like turbidity trapping materials are radially provided on the circumferential side of a twisted core string. Such a filter medium is described in JP-A-8-299707 and is publicly known. When the core cord of the filter medium (4) is long and protrudes from both ends of the protruding range of the suspended matter trapping material, the core cords of both end protruding portions are used as the upper suspension cord (7) and the lower suspension cord (8). You can do it.

In the suspended matter removing device (A), the distance (LA) between the upper support (2) and the lower support (3), the length (LB) of the filter medium (4), and the upper hanging string (7). ) Length (Lb
1), the length (Lb2) of the lower hanging string (8) satisfies the formulas (1) to (3) defined below.

[0015]

[Equation 2] (Lb1 + LB + Lb2) <LA (1) LA <LB (2) (LB + Lb2) <LA <(LB + Lb1) (3)

That is, in the suspended matter removing device (A),
As shown in the formula (1), the total length (Lb1 + LB + Lb2) of the filter medium (4), the upper support (2) and the lower support (3).
Is longer than the distance (LA) between the upper support (2) and the lower support (3). Therefore, any one of the above elements exists in the tower (1) in a loose state.

Further, as shown in the formula (2), the distance (LA) between the upper support (2) and the lower support (3) is longer than the length (LB) of the filter medium (4). Therefore, a region where the filter medium (4) does not exist is formed between the upper support (2) and the lower support (3) along the flowing water direction. In other words, the movable range of the filter medium (4) is formed along the flowing direction. Although there are gaps between the filter media (4) in the schematic illustrations of FIGS. 1 and 2, there are actually no gaps between the filter media (4), and the plurality of filter media (4) are dense. The filter media (4) are suspended so as to be in a state so that the whole of the plurality of filter media (4) moves only along the flowing direction (vertical direction).

Further, as shown in the formula (3), the total length (LB + Lb1) of the filter medium (4) and the upper suspension cord (7) is equal to the total length of the filter medium (4) and the lower suspension cord (8). Sa (LB + Lb
2) longer. Therefore, during the raw water treatment operation in which the raw water is supplied in the downward flow type, as shown in FIG. 1, the filter medium (4) contacts the lower support (3) and the lower suspension cord (8).
During the cleaning operation in which the cleaning water is supplied in the vicinity of the bottom of the tower and is supplied with the cleaning water in the upward flow mode, the filter medium (4) does not contact the upper support (2) and does not contact the upper support (2) as shown in FIG. The suspension string (8) is extended upward in the tower.

As a result of the above, in the turbidity removing device (A), turbidity is trapped and discharged by the filter medium by the consolidation state of the filter medium during the raw water treatment operation and the release of the consolidation state of the filter medium during the washing operation. Done efficiently.

In the turbidity removing apparatus (A), it is preferable that each of the above-mentioned elements satisfies the following formulas (1 ') to (3'). The numerical value of the magnitude relation of each element in the equations (1 ′) to (3 ′) is a value determined in consideration of the economical efficiency of the device.

[0021]

[Equation 3] 1.01 × LA <(Lb1 + LB + Lb2) <2.00 × LA (1 ′) 1.01 x LB <LA <1.50 x LB (2 ') 1.01 (LB + Lb2) <LA <1.01 (LB + Lb1) (3 ')

The dimensions of the above-mentioned respective elements of the suspended matter removing device (A) are as follows. That is, the distance (LA) between the upper support (2) and the lower support (3) is 100 to 400.
cm, the length (LB) of the filter medium (4) is 70 to 300 cm,
The length (Lb1) of the upper hanging string (7) is 10 to 250c
m, the length (Lb2) of the lower hanging string (8) is 5 to 20c
m, the diameter of the tower (1) is 20 to 360 cm.

According to the present invention, in the turbidity removing apparatus (A) configured as described above, a turbidity trapping material is present between the plurality of filter media (4) during the passage of raw water. The suspension concentrated liquid withdrawing pipe (9) having an opening (91) provided in the range and the opening (92) at the base end of the pipe is conducted in the same direction as the filter medium (4). It is characterized by having done.

In the case of the suspended matter removing apparatus (A) of the preferred embodiment of the present invention shown in FIGS. 1 and 2, the range in which the opening (91) is provided is from the upper support (2) to the above (LB + Lb).
It is the equivalent range of ± 10% of the position (P) of the length of 1-LA). As shown in FIG. 1, the position (P) is in contact with the lower support (3), and a part of the support (3) is consolidated near the bottom of the tower. Corresponding to the position of the boundary between the section and the non-consolidated section). The base end of the above-mentioned consolidated part is
In other words, it corresponds to the cake filtration surface in the suspended matter removing apparatus of the present invention in which cake filtration and depth filtration are performed by the filter medium (4).

In the turbidity removing apparatus of the present invention, the turbidity concentrate withdrawal pipe (9) was concentrated by the filter medium (4) in the tower (1) during the raw water treatment operation shown in FIG. It has a function of extracting a part of raw water (turbid concentrate) out of the tower (1). As a result, the load (amount of suspended matter) during the raw water treatment operation of the suspended matter removing device is reduced, and the water passage time is extended. In short, suspended liquid extraction pipe (9)
The turbidity removal apparatus of the present invention equipped with, to obtain treated water that does not contain turbidity and concentrate raw water in the process to form a turbidity concentrated liquid, and to extract a part of the suspended matter It is intended to reduce it. The function of withdrawing the turbid concentrate from the turbid concentrate withdrawal pipe (9) is achieved by the water pressure in the tower (1). Therefore, a flow rate control valve is required to control the amount of withdrawal, but a pump is not required.

The suspended liquid withdrawing pipe (9) shown in FIGS. 1 and 2 is connected at its proximal end and distal end to the upper support (2) and the lower support (3), and has a reinforcing function for these supports. Is equipped with. Then, a plurality of small holes are provided as openings (91) around the portion corresponding to the above-mentioned position (P) of the suspended liquid concentrate withdrawing pipe (9). However, the suspended liquid withdrawal pipe (9) does not need to be connected to the lower support (3) and is an open-end type pipe having a length corresponding to the position (P) described above. Good. In this case, the open end of the pipe corresponds to the above-mentioned opening (91).

Further, the number and arrangement method of the suspended liquid withdrawing pipes (9) are arbitrary, and are appropriately selected in consideration of the inner diameter of the tower (1) and the filter material (4) suspended in the tower. Figure 3
In the case of the turbidity removing apparatus shown in FIG. 5, five filter media (4) are provided, four of which are arranged inscribed in the column (1) and the other one is arranged in the center thereof. Further, one suspension concentrated liquid extraction pipe (9) is provided (four in total) at a position sandwiched between the three filter media (4).

The openings at the base ends of the plurality of suspension liquid withdrawing pipes (9) shown in FIGS. 1 and 2 are respectively combined and are conducted to the outside of the tower (1) via one common pipe. ing. Specifically, in the case of the turbidity removing apparatus shown in FIG. 3, the common pipe has a structure in which a straight pipe is horizontally connected to a ring-shaped pipe, and four turbidity concentrate extracting liquids are taken out to the ring-shaped pipe. The pipe (9) is connected.

When the basic elements of the turbidity removal device (A) have the above-mentioned dimensions, the inner diameter of the turbidity concentrate withdrawal pipe (9) is the diameter of the tower (1) (20 to 360 cm).
1-10 to 1/40 of the range, and the diameter of the small holes provided as the opening (91) around the suspension liquid withdrawing pipe (9) is usually 1 to 5 mm, and the number thereof is usually It is 3 to 40.

Withdrawal of the turbid concentrate from the turbid concentrate withdrawal pipe (9) is performed during the raw water treatment operation. Withdrawal of the suspension concentrate can be started at any stage before a breakthrough phenomenon (leakage of suspension) occurs. However,
When the start of the extraction of the suspended liquid concentrate is too late, the purpose of reducing the amount of suspended solids and extending the water passage time cannot be achieved. Therefore, withdrawal of the suspension concentrate should be at least
It is better to start in the range where the turbidity in the raw water is concentrated 2 to 20 times. The suspended liquid concentrate extracted at this stage is purged. Then, the amount of the suspension concentrate extracted is usually 2 to the flow rate of the raw water supplied to the tower (1).
It is 40%, preferably 5 to 20%.

The extraction as described above may be carried out from the start of the raw water treatment operation. In this case, it is preferable that the liquid extracted until the turbidity in the raw water falls within the above range is recycled to the raw water tank. Such recycling increases the water recovery rate. Such switching of recycling or purging can be performed by a three-way valve provided at the opening (92) at the base end of the suspended liquid for withdrawing suspended solids (9) as shown in FIGS. 1 and 2. Switching of the three-way valve is performed automatically by measuring the physical properties (turbidity, concentration, permeability, etc.) of the extracted liquid with a measuring device (turbidity meter, densitometer, photometer, etc.). You can also do it on a regular basis. Then, by measuring the physical properties of the liquid extracted from the suspension liquid for extracting suspension liquid (9), it is possible to predict a breakthrough phenomenon (leakage of suspension) in the suspension device.
It is possible to stabilize the operation of the suspended matter removing device. In addition, when the liquid is withdrawn from the start of the raw water treatment operation and recycled to the raw water tank, the amount of recycled withdrawal is
Similar to the above, the flow rate of the raw water supplied to the tower (1) is usually 2 to 40%, preferably 5 to 20%.

In the illustrated suspended matter removing apparatus of the present invention,
Opening (92) at the proximal end of the suspended liquid withdrawing pipe (9)
Is provided at the base end on the opposite side of the opening (91) (upper side of the tower (1)), but at the base end on the opening (91) side (lower side of the tower (1)). Good. Further, the illustrated turbidity removing apparatus of the present invention is a turbidity removing apparatus in which raw water is supplied in a downward flow type and washing water is supplied in an upward flow type, but the turbidity removing apparatus of the present invention is The turbidity removing device may be one in which raw water is supplied in an upward flow type and washing water is supplied in a downward flow type. In this case, the turbidity removing device has the same basic structure as described above. That is, in the raw water treatment operation mode, the raw water is supplied from the pipe (51) located at the bottom of the apparatus shown in FIG.

[0033]

According to the present invention described above, a plurality of filter media composed of a core cord and a turbidity trapping material projecting on the circumferential side of the core cord are provided between the supports arranged above and below the inside of the tower. It is fixed in a suspended state so that it can be pressed by one of the support bodies to form a dense state when the raw water is passed by the hanging strings at both ends of the filter medium and can be released when the wash water is passed to form a rough state. A turbidity removing device comprising the following: an improved turbidity removing device for extending the water passage time. Therefore, the industrial value of the present invention is remarkable.

[Brief description of drawings]

FIG. 1 is a schematic explanatory view of a preferred example of the suspended matter removing apparatus of the present invention (in the case of raw water treatment operation)

FIG. 2 is a schematic explanatory view of a preferred example of the suspended matter removing apparatus of the present invention (in the case of cleaning operation)

FIG. 3 is a schematic explanatory view of a cross section taken along line III-III of the suspended matter removing apparatus shown in FIG.

[Explanation of symbols]

A: Suspended matter removing device 1: tower 2: Upper support 3: Lower support 4: Filter material 51-63: Piping 61-65: Valve 7: Upper hanging string 8: Lower hanging string 9: Suspended liquid concentrate extraction pipe 91: opening 92: opening

[Procedure amendment]

[Submission date] March 5, 2002 (2002.3.5)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 2

[Correction method] Change

[Correction content]

## EQU1 ## LA <(Lb1 + LB + Lb2) (1) LB <LA (2) (LB + Lb2) <LA <(LB + Lb1) (3)

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

[0015]

## EQU00002 ## LA <(Lb1 + LB + Lb2) (1) LB <LA (2) (LB + Lb2) <LA <(LB + Lb1) (3)

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

[0021]

## EQU00003 ## 1.01 × LA <(Lb1 + LB + Lb2) <2.00 × LA (1 ′) 1.01 × LB <LA <1.50 × LB (2 ′) 1.01 × (LB + Lb2) <LA < 1.01 x (LB + Lb1) (3 ')

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 29/38 530B 540 (72) Inventor Hiroyasu Ochi 1000 Kamoshida-cho, Aoba-ku, Yokohama-shi Kanagawa Japan Renrensui Inside Institute

Claims (2)

[Claims] 1. A plurality of filter media composed of a core cord and a suspended matter trapping material projecting on the circumferential side of the core cord between support bodies arranged above and below the inside of the tower are suspended by suspending cords at both ends of the filter media. In a turbidity removing device, which is fixed in a suspended state so as to be pressed into one support to form a dense state when passing raw water and to release a dense state when passing wash water to form a rough state, Between the plurality of filter media, an opening is provided in a range where the suspended solid is present when the raw water is passed, and the suspended concentrated liquid in which the opening at the base end is conducted to the outside of the tower. A suspended matter removing device characterized in that the extraction pipe is arranged in the same direction as the filter medium. 2. A turbidity removing device in which raw water is supplied in a downward flow format and washing water is supplied in an upward flow format, and a raw water supply pipe with a valve and a cleaning pipe are provided at the top of the tower (1). A waste water discharge pipe is provided, a treated water discharge pipe with a valve, a wash water supply pipe, and an air supply pipe are provided at the bottom of the tower (1), and an upper support (2) and a lower support are provided inside the tower. Body (3)
Between the upper support (2) and the lower support (3), and a plurality of filter media (4) consisting of a core cord and a suspended matter trapping material projecting from the peripheral side of the core cord. It is fixed in a suspended state by the upper hanging string (7) and the lower hanging string (8) at the end of the filter medium, and the core string of the filter medium (4) and the upper hanging string (7).
The lower suspension string (8) is configured to be bendable and deformable along the flowing direction, and the distance (LA) between the upper support (2) and the lower support (3) and the length of the filter medium (4) ( LB), the length (Lb1) of the upper hanging string (7), and the length (Lb2) of the lower hanging string (8) satisfy the formulas (1) to (3) defined below. In the space between the plurality of filter media (4), the upper support (2) to the (LB +
The opening (91) is provided in a range corresponding to ± 10% of the length position of (Lb1-LA) and the opening (92) at the base end thereof.
The turbidity removal device according to claim 1, wherein a turbidity concentrate withdrawing pipe (9) communicating with the outside of the tower (1) is arranged in the same direction as the filter medium (4). ## EQU1 ## (Lb1 + LB + Lb2) <LA (1) LA <LB (2) (LB + Lb2) <LA <(LB + Lb1) (3)