JP2003053113A - Method for operating apparatus for removing turbid component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for operating a turbid component removing apparatus while reducing costs of washing water, and to provide the apparatus for removing the turbid component which has a structure that turbid components can be captured on a filter medium and then discharged effectively by releasing the pressure-compacted state of the filter medium in raw water treating operation and the pressure-compacted state of the filter medium in washing operation. SOLUTION: This method for operating the turbid component removing apparatus comprises repeating one raw water treating step and a plurality of washing steps. At least the final washing step is carried out by using the water obtained by removing the turbid components as washing water. At least one washing operation before the final washing operation is carried out by using raw water as the washing water.

Description

Detailed Description of the Invention

[0001]

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

[0002]

2. Description of the Related Art As a device for removing suspended solids (turbidity) in raw water, a turbidity removing device in which raw water is supplied in a downflow type and washing water is supplied in an upflow type, A turbidity removing device is effective between the supports arranged above and below the pressurizing unit when the raw water is supplied to form a consolidated state by being pressed by the lower support and to release the consolidated state when the cleaning water is supplied. Is. According to such a device, the filter medium is efficiently trapped and discharged by the pressure-consolidated state of the filter medium during the raw water treatment operation and the release of the pressure-consolidated state during the cleaning operation. The operation method of the above-mentioned turbidity removal apparatus consists of repeatedly performing the raw water treatment operation and the cleaning operation a plurality of times, and the turbidity removal treated water is used as the cleaning water in all the cleaning operations.

[0003]

DISCLOSURE OF THE INVENTION An object of the present invention is to efficiently capture and discharge turbidity by a filter medium by consolidating the filter medium during the raw water treatment operation and releasing the filter medium during the washing operation. Another object of the present invention is to provide a method of operating a turbidity removing device having a structure according to claim 1, wherein the method of operating a turbidity removing device is intended to reduce the cost of cleaning water used in the cleaning operation.

[0004]

That is, the gist of the present invention is a turbidity removing device in which raw water is supplied in a downflow type and washing water is supplied in an upflow type, which is a tower (1). At the top of the, there is provided a raw water supply pipe with a valve and connected to a raw water tank, and a cleaning wastewater discharge pipe with a valve,
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 (3) are arranged inside the tower. Between the upper support (2) and the lower support (3), a plurality of filter media (4) composed of a core cord and a suspended matter trapping material projecting from the peripheral side of the core cord are provided at the ends of the filter media. The upper part of the hanging part (7) and the lower part of the hanging string (8) are fixed in a suspended state, and the filter medium (4)
Core string and upper hanging string (7) and lower hanging string (8)
Is configured to be bendable and deformable along the direction of flowing water, and 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 (L
b1) and the length (Lb2) of the lower suspension string (8) satisfy the equations (1) to (3) defined below, which is a method of operating the turbidity removal device (A), and a raw water treatment operation And a plurality of washing operations are repeated, and at least the final washing operation uses the turbidity removal treated water as the washing water.
The present invention resides in a method of operating a turbidity removing device, characterized in that raw water is used as washing water in at least part of the washing operation before that.

[0005]

[Equation 6] (Lb1 + LB + Lb2) <LA (1) LA <LB (2) (LB + Lb2) <LA <(LB + Lb1) (3)

[0006]

DETAILED DESCRIPTION OF THE INVENTION The present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 are schematic explanatory views of a preferred example of the suspended matter removing apparatus according to the present invention. (A) of each figure is an explanatory diagram of the raw water treatment operation,
(B) is an explanatory view of the cleaning operation.

First, the suspended matter removing apparatus shown in FIG. 1 will be described. The turbidity removal device used in the present invention is a turbidity removal device in which raw water is supplied in a downflow type and washing water is supplied in an upflow type. Therefore, at the top of the tower (1), there is provided a raw water supply pipe having a valve and connected to a raw water tank, and a cleaning wastewater discharge pipe having a valve.
At the bottom of the unit, a treated water discharge pipe with a valve, a wash water supply pipe, and an air supply pipe are provided. In the apparatus shown in FIG. 1, the pipes used in the raw water treatment operation and the cleaning operation are common, and the water flow direction is changed by operating the valve.

That is, in the case of the raw water treatment operation, only the valves (61) and (62) are opened, and the raw water containing suspended matter is passed from the valve (61) through the pipe (51) to the tower (1). Supplied within. At this time, the filter medium (4) is in a compacted state as described later, and the suspended matter entrained in the raw water is captured by the filter medium (4). Treated water that does not contain suspended solids,
It is discharged from the valve (62) via the pipe (52).

On the other hand, in the case of the washing operation, the valves (61) and (62) which were in the open state during the raw water treatment operation are closed, and the washing water is supplied from the valve (64) through the pipe (52) to the tower ( 1) is supplied inside. 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 consolidated state as described later,
Suspended matter is removed from the filter medium (4). The bubbling action of air vibrates the filter medium (4) and promotes the separation of suspended matter attached to the filter medium (4). Wash water containing suspended matter,
It is discharged from the valve (65) via the pipe (51).

An upper support (2) and a lower support (3) are arranged inside the tower, and a plurality of filter media (4) are provided between the upper support (2) and the lower support (3). It is fixed in a suspended state by an upper hanging string (7) and a 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 projecting 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, the upper support (2)
(LA) between the lower support (3) and the lower support (3), filter media (4)
Length (LB), length of the upper hanging string (7) (Lb1),
The length (Lb2) of the lower hanging string (8) needs to satisfy the expressions (1) to (3) defined below.

[0015]

[Equation 7] (Lb1 + LB + Lb2) <LA (1) LA <LB (2) (LB + Lb2) <LA <(LB + Lb1) (3)

That is, in the turbidity removing apparatus, 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 is a gap between the filter media (4) in the schematic explanatory view of FIG. 1, there is actually no gap between the filter media (4), and the plurality of filter media (4) are in a dense state. Thus, the whole of the plurality of filter media (4) moves only along the flowing direction (up and down 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 (a), the filter medium (4) contacts the lower support body (3) and the lower suspension cord (8). During the cleaning operation in which the cleaning water is supplied near the bottom of the tower and is supplied with the cleaning water in the upward flow mode, the filter medium (4) is brought into contact with the upper support (2) as shown in FIG. 1 (b). Instead, it is in a state of being extended upward in the tower together with the lower hanging string (8).

As a result of the above, in the turbidity removing apparatus, the filter material is efficiently trapped and discharged by the filter material being compressed during the raw water treatment operation and being released from the cleaning operation during the washing operation. Done.

In the suspended matter removing apparatus used in the present invention,
Each of the above elements is represented by the following formulas (1 ′) to (3 ′)
It is preferable to satisfy 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 8] 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 each of the above-mentioned elements of the suspended matter removing apparatus 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 250 cm, the length (Lb2) of the lower hanging string (8) is 5 to 20 cm, and the tower. The diameter of (1) is 20 to 360 cm.

Next, an operation method of the suspended matter removing apparatus shown in FIG. 1 will be described. The operation method of the present turbidity removal apparatus consists of repeatedly performing a raw water treatment operation and a plurality of washing operations.

In the raw water treatment operation (FIG. 1 (a)),
As described above, only the valves (61) and (62) are opened, and raw water containing suspended matter is supplied from the valve (61) into the tower (1) via the pipe (51). The suspended matter entrained in the raw water is captured by the filter medium (4). Treated water that does not contain turbidity passes through the pipe (52) to the valve (6
It is discharged from 2).

In the raw water treatment operation, for example,
The raw water treatment operation is stopped when the performance of the turbidity removal device deteriorates by means such as measuring the pressure of the raw water supply pump (not shown) and analyzing the quality of the treated water. The raw water treatment operation may be stopped automatically after a certain period of time.

In the washing operation (FIG. 1 (b)), as described above, the valve (6) which was in the open state during the raw water treatment operation was used.
1) and (62) are closed, and the washing water flows through the valve (6
4) is supplied into the tower (1) via the pipe (52). On the other hand, air is supplied from the valve (63) into the tower (1) via the pipe (53). The supply of air may start at the same time as the supply of wash water, or may start later than the supply of wash water. The wash water containing suspended matter is discharged from the valve (65) via the pipe (51). At this time, the filter medium (4) does not come into contact with the upper support (2) and is in a state of extending upward in the tower together with the lower suspension string (8).
However, it is not necessary to perform a long-time washing operation until the concentrated suspended matter on the upper part of the filter medium (4) is removed because it is uneconomical to use a large amount of washing water. The operation up to this point completes the first washing operation.

Then, the valve (64) and the valve (6
3) is closed and only the valve (62) is opened.
As a result, the stored water in the tower is extracted, the state shown in FIG. 1A is reached, and the preparation for the second cleaning operation is completed. Subsequently, the same operation as above is repeated to perform the second washing operation. The number of such plural cleaning operations is not particularly limited and is appropriately determined in consideration of the cleaning effect of the filter medium (4).

According to the present invention, in a plurality of cleaning operations performed as described above, the suspended water is used as the cleaning water for at least the final cleaning operation, and at least a part of the cleaning operation before the cleaning operation is performed. The feature is that raw water is used as washing water. When the washing operation is performed twice, raw water is used as the washing water in the first washing operation, and suspended solid treatment water is used as the washing water in the second washing operation. Here, as the turbidity removal treated water, a filter or a membrane (reverse osmosis membrane, ultrafiltration membrane,
In addition to water treated with a microfiltration membrane, etc., water treated with the suspended matter removing device used in the present invention is used.

To switch the type of wash water as described above, for example, a switching valve (not shown) is installed in the pipe (52) behind the valve (64) and the raw water supply pipe is connected to the switching valve. It can be done by In this case, turbidity removal treated water is supplied from the pipe (52).

Next, the suspended matter removing device shown in FIG. 2 will be described. The turbidity removing apparatus shown in FIG. 2 is the same as the turbidity removing apparatus shown in FIG. 1 except that the following intermediate drainage pipe is provided.

That is, in the turbidity removing apparatus shown in FIG. 2, the upper support (2) and the lower support except the range corresponding to the length (Lb1) of the upper suspension string (7) from the upper support (2). A column (66) is provided in the middle of the region between the body (3) and the column side part of the region excluding the regions corresponding to 10% of the height of the region from the upper end and the lower end of the region. A water pipe (54) is provided. Intermediate drainage pipe (5
It is also possible to provide a plurality of 4) around the tower side part of the same height. Such an intermediate drainage pipe (54) has a function of efficiently performing a cleaning operation as described below.

That is, in the case of the suspended matter removing apparatus of the present invention configured as described above, trapping of suspended matter by the filter medium (4) is performed as follows. Suspended matter having a large particle size is captured at a relatively early stage after colliding with the filter medium (4), and in the explanatory view of the raw water treatment operation of FIG. 2 (a), it is about the upper half of the filter medium (4). Captured in the area. In addition, a coagulant is generally added to the raw water treated by the turbidity removal device in order to enlarge the particle size of the trapped turbidity and enhance the treatment efficiency. Therefore, in the normal period when it is necessary to switch to the cleaning operation, the upper half region of the filter medium (4) is significantly contaminated rather than the lower half region.

The intermediate drainage pipe (54) is the position determined as the position where the filter medium (4) is exposed on the water surface by draining the stored water. Therefore, when the cleaning water and the air are supplied in the second cleaning operation performed after the stored water is extracted by the intermediate drainage pipe (54), the filter medium (4)
The liquid surface rising in the portion not soaked in water swells and violently shakes the filter medium (4) (particularly, the turbidity capturing medium projecting on the peripheral side of the core cord). As a result, a peeling effect with high turbidity can be obtained. Therefore, it is preferable to determine the position of the intermediate drainage pipe (54) so that the filter medium (4) in a portion that is significantly contaminated is exposed on the water surface by draining the stored water. Such a position can be easily confirmed by preliminary experiments. If the position of the intermediate drainage pipe (54) is too low, the portion that is not contaminated as much as the difference in the filter medium (4) will be turbid and peeled off due to the ripple of the liquid surface, which is not efficient.

Next, a first operation method of the suspended matter removing apparatus shown in FIG. 2 will be described. The point that the raw water treatment operation and the cleaning operation are repeated a plurality of times is the same as above. Then, the plurality of cleaning operations consist of performing the following operations (A) and (B) and then performing each operation (A) and (B) again. When the cleaning operation is performed twice, raw water is used as the cleaning water for the first cleaning operation,
As the cleaning water for the second cleaning operation, turbidity removal treated water is used.

(A) Washing operation in which wash water (raw water) and air are supplied from the bottom of the tower and discharged from the top of the tower (FIG. 2)
(B)) is performed. The specific method is the same as the case of the operation method of the suspended solid removing apparatus shown in FIG.

(B) After stopping the supply of washing water (raw water) and air in a state where the lower hanging string (8) and the filter medium (4) extend upward in the tower, the inside of the tower is removed from the intermediate drainage pipe (54). Perform a partial draining process to drain the stored water. By such an operation, the filter medium (4) in a portion that is significantly contaminated is exposed on the water surface by extracting the stored water.

The above operations (A) and (B) are not limited to being repeated once, but may be repeated a plurality of times as necessary. Usually, it is carried out three times, and the suspended water-removing treated water is used as the washing water in the third washing operation. And one that is always done
In the operation (A), which is repeated twice, the suspended matter is removed by the ripples on the liquid surface, and the suspended matter is effectively removed from the filter medium (4).

The above-mentioned first operation method is mainly applied when the filter medium (4) itself is not significantly contaminated, and has an advantage that the withdrawal time of the stored water can be shortened. That is, when the whole amount of the stored water is extracted from the bottom of the tower, it takes a long time to extract the stored water because it is extracted through the filter media (4) suspended in a dense state. On the other hand, in the case of the first operation method described above, since the water is extracted from the intermediate drainage pipe (54) provided on the tower side part as a part of the water removal step, the extraction time of the stored water is significantly shortened. , It is possible to switch to raw water treatment operation early. Further, in the case of the above-mentioned first operating method, since the stored water is only partially extracted, the amount of wash water can be reduced.

Next, the second operation method of the suspended matter removing apparatus shown in FIG. 2 will be described. The second operating method is the same as the first operating method, except that after performing the operations (A) and (B), the operations (A) and (B) are performed again. The following operations (C) to (E) are performed. When the cleaning operation is performed twice, raw water is used as the cleaning water for the first cleaning operation and turbidity removal treated water is used as the cleaning water for the second cleaning operation.

(C) A total water removal process is carried out in which all the stored water in the tower is withdrawn from the bottom of the tower. Specifically, the valve (62) is opened again, and the entire amount of the stored water in the tower is discharged from the valve (62) via the pipe (52).
Since the stored water having a high turbidity concentration is extracted in the operation (B) (partial drainage step), even if it is extracted from the bottom of the column, no major pollution occurs in the column.

(D) A washing operation is performed in which washing water (water for removing suspended matter) and air are supplied from the bottom of the tower and discharged from the top of the tower. That is, the same operation as the above (A) is performed. Specifically, the valve (62) that was opened by the operation of (C) above is closed, and the washing water (water for removing suspended matter)
Is supplied from the valve (64) into the tower (1) via the pipe (52). On the other hand, air is the valve (63)
Is supplied into the tower (1) via the pipe (53).

The above-mentioned operation (D) (cleaning operation) is started from a state where there is no water in the tower (1), so in short, washing water and air are mixed in the filter medium (4) which is not soaked in water. Is supplied, the turbidity peeling process by the ripple of the liquid surface is performed on the entire filter medium (4). Therefore, the second operation method described above is mainly applied when the filter medium (4) itself is significantly contaminated. The operation (D) is the same as the operation (A) described above.
Similar to the operation, at least until the lower hanging string (8) and the filter medium (4) extend upward in the tower.

(E) Washing water (water for removing suspended matter) in a state where the lower hanging string (8) and the filter medium (4) extend upward in the tower.
And after stopping the supply of air, a partial water withdrawal step of withdrawing the stored water in the tower from the intermediate water withdrawal pipe (54) is performed. The operation (E) is performed in the same manner as the operation (B).

Next, the turbidity removing device shown in FIG. 3 will be described. The turbidity removing apparatus shown in FIG. 3 is the same as the turbidity removing apparatus shown in FIG. 1 except that the following intermediate drainage pipe is provided.

That is, in the turbidity removing apparatus shown in FIG. 3, the tower side portion below the upper support (2) by a distance corresponding to the range of the length (Lb1) ± 10% of the upper suspension string (7). Is equipped with an intermediate drainage pipe (54) with a valve (66). Furthermore, as a preferred embodiment, a valve () is provided on the side of the tower above the lower support (3) by a distance corresponding to the total length (LB + Lb2) ± 10% of the filter medium (4) and the lower suspension string (8). An intermediate drainage pipe (55) with 67) is provided. Each intermediate drain pipe (54) and (55)
It is also possible to provide a plurality of towers around the same side of the tower.

Each of the above intermediate drainage pipes (54) and (55)
Both have the function of favorably performing the process of switching from the cleaning operation to the raw water treatment operation (the water removal process after the cleaning operation).

That is, in the washing operation in which the washing water is supplied in the upward flow type, the suspended matter discharged from the filter medium (4) is concentrated toward the top of the column, and particularly, the whole is like a piston. Concentration of suspended matter is high in the upper part of the raised filter medium (4). Therefore, it is necessary to extract the stored water in the tower from the intermediate drain pipe provided on the side of the tower in order to avoid recontamination of the filter medium with the concentrated suspended matter. The above-mentioned position of the intermediate drainage pipe (54) is a position (the length from the upper support (2) to the upper suspension string (7) (Lb1) where the filter medium (4) is not exposed on the water surface by draining the stored water. The position corresponding to ()) and the allowable range (± 10%) are taken into consideration. The above-mentioned position of the intermediate drainage pipe (55) is a position determined for draining the stored water above the filter medium (4) where the concentration of suspended matter is particularly high.

Next, a first operation method of the suspended matter removing apparatus shown in FIG. 3 will be described. The point that the raw water treatment operation and the cleaning operation are repeated a plurality of times is the same as above.

In a plurality of washing operations, the following operations (A) and (B) are performed, and then the same operations (A) and (B) are performed.
Each of the above operations is repeated. When the cleaning operation is performed twice, raw water is used as the cleaning water for the first cleaning operation and turbidity removal treated water is used as the cleaning water for the second cleaning operation.

(A) Washing operation in which wash water (raw water) and air are supplied from the bottom of the tower and discharged from the top of the tower (FIG. 1)
(B)) is performed. The specific method is the same as the case of the operation method of the suspended solid removing apparatus shown in FIG. The stored water in the upper part of the filter medium (4) is extracted from the intermediate drainage pipe provided in the tower side part by the operation of the following (B).

(B) After stopping the supply of washing water (raw water) and air in a state where the lower hanging string (8) and the filter medium (4) extend upward in the tower, the inside of the tower is removed from the intermediate drainage pipe (54). Perform a partial draining process to drain the stored water. Then, in the case of the apparatus of the preferred embodiment equipped with the intermediate drainage pipe (55), the drainage from the intermediate drainage pipe (55) is performed before the intermediate drainage pipe (54). The following benefits can be obtained by such an operation. That is, when it is attempted to extract all of the stored water from the intermediate drainage pipe (54), the stored water with a high turbidity concentration existing above the intermediate drainage pipe (55) diffuses due to the decrease in the water level, and May be contaminated. However,
By extracting from the intermediate drainage pipe (55) before the intermediate drainage pipe (54), the above problem can be solved.

The withdrawal from the intermediate drainage pipe (55) starts from the state in which the lower suspension string (8) and the filter medium (4) extend upward in the tower (see FIG. 3 (b)). The subsequent extraction from the intermediate drainage pipe (54) corresponds to the range of the length (Lb1) ± 10% of the upper support (2) to the upper suspension string (7) due to the weight of the filter medium (4) containing water due to its own weight. The process ends in a state in which the distance is lowered downward (see FIG. 1A).

The above operations (A) and (B) are not limited to being repeated once but may be repeated a plurality of times as necessary. Usually, it is carried out three times, and the suspended water-removing treated water is used as the washing water in the third washing operation.

The first operation method described above is mainly applied when the filter medium (4) itself is not significantly contaminated, and has the advantage of shortening the extraction time of the stored water. That is, when the whole amount of the stored water is extracted from the bottom of the tower, it takes a long time to extract the stored water because it is extracted through the filter media (4) suspended in a dense state. On the other hand, in the case of the first operation method described above, since the water is extracted from the intermediate drainage pipe (54) provided on the tower side part as a part of the water removal step, the extraction time of the stored water is significantly shortened. , It is possible to switch to raw water treatment operation early. Further, in the case of the above-mentioned first operating method, since the stored water is only partially extracted, the amount of wash water can be reduced.

Next, the second operation method of the suspended matter removing apparatus shown in FIG. 3 will be described. The second operating method is the same as the first operating method, except that after performing the operations (A) and (B), the operations (A) and (B) are performed again. The following operations (C) to (E) are performed. When the cleaning operation is performed twice, raw water is used as the cleaning water for the first cleaning operation and turbidity removal treated water is used as the cleaning water for the second cleaning operation.

(C) A total water removal process is carried out in which all the stored water in the tower is withdrawn from the bottom of the tower. Specifically, the valve (62) is opened again, and the entire amount of the stored water in the tower is discharged from the valve (62) via the pipe (52).
Since the stored water having a high turbidity concentration is extracted in the operation (B) (partial drainage step), even if it is extracted from the bottom of the column, no major pollution occurs in the column.

(D) A washing operation is carried out in which washing water (turbid removal treatment water) and air are supplied from the tower bottom and discharged from the tower top. That is, the same operation as the above (A) is performed. Specifically, the valve (62) that was opened by the operation of (C) above is closed, and the washing water (water for removing suspended matter)
Is supplied from the valve (64) into the tower (1) via the pipe (52). On the other hand, air is the valve (63)
Is supplied into the tower (1) via the pipe (53).

Since the above operation (D) (cleaning operation) is started from the state where there is no water in the tower (1), in short, washing water and air are not mixed in the filter medium (4) which is not soaked in water. Since the liquid is supplied, the liquid surface rising in the filter medium (4) undulates and violently shakes the filter medium (4) (particularly, the turbidity trapping material projected on the circumferential side of the core string). As a result, the second operation method described above is characterized by a large effect of removing suspended solids.
Therefore, the second operation method described above is mainly applied when the filter medium (4) itself is significantly contaminated. The operation (D) needs to be performed at least until the lower hanging string (8) and the filter medium (4) extend upward in the column, as in the operation (A).

(E) Washing water (water for removing suspended matter) in a state where the lower hanging string (8) and the filter medium (4) extend upward in the tower.
And after stopping the supply of air, a partial water withdrawal step of withdrawing the stored water in the tower from the intermediate water withdrawal pipe (54) is performed. The operation (E) is performed in the same manner as the operation (B).

[0060]

As described above, according to the present invention, it is possible to efficiently capture and discharge suspended matter by the filter medium by the pressure-consolidated state of the filter medium during the raw water treatment operation and the release of the compressed state of the filter medium during the washing operation. A method of operating a turbidity removal device with a structure that is performed, in which raw water is used as part of the wash water used in the cleaning operation to reduce the cost of the wash water. To be done. 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 a suspended matter removing device according to the present invention.

FIG. 2 is a schematic explanatory view of another preferred example of the suspended matter removing apparatus according to the present invention.

FIG. 3 is a schematic explanatory view of another preferred example of the suspended matter removing apparatus according to the present invention.

[Explanation of symbols]

1: tower 2: Upper support 3: Lower support 4: Filter material 7: Upper hanging string 8: Lower hanging string 54: Intermediate drainage pipe 55: Intermediate drainage pipe 51-53: Piping 61-67: Valve

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] March 5, 2002 (2002.3.5)

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

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

## EQU00002 ## 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 × (LB + Lb1) (3 ′) (A) A washing operation in which washing water and air are supplied from the bottom of the tower and discharged from the top of the tower. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54).

## 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 × (LB + Lb1) (3 ′) (A) A washing operation in which washing water and air are supplied from the bottom of the tower and discharged from the top of the tower. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). (C) A total water removal process of extracting all the stored water in the tower from the bottom of the tower. (D) A washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (E) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54).

## EQU00004 ## 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 × (LB + Lb1) (3 ′) (A) A washing operation in which washing water and air are supplied from the bottom of the tower and discharged from the top of the tower. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54).

## EQU00005 ## 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 × (LB + Lb1) (3 ′) (A) A washing operation in which washing water and air are supplied from the bottom of the tower and discharged from the top of the tower. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). (C) A total water removal process of extracting all the stored water in the tower from the bottom of the tower. (D) A washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (E) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54).

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0005

[Correction method] Change

[Correction content]

[0005]

## EQU6 ## LA <(Lb1 + LB + Lb2) (1) LB <LA (2) (LB + Lb2) <LA <(LB + Lb1) (3)

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0015

[Correction method] Change

[Correction content]

[0015]

## EQU00007 ## LA <(Lb1 + LB + Lb2) (1) LB <LA (2) (LB + Lb2) <LA <(LB + Lb1) (3)

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0021

[Correction method] Change

[Correction content]

[0021]

Equation 8 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 ')

─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. ⁷ Identification Code FI Theme Coat (Reference) B01D 29/38 580H

Claims (5)

[Claims] 1. A turbidity removing device in which raw water is supplied in a downward flow type and washing water is supplied in an upward flow type, wherein a tower (1) has a valve at the top and a raw water tank. Is provided with a raw water supply pipe and a washing wastewater discharge pipe with a valve, 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). An upper support (2) and a lower support (3) are arranged inside, and a core cord and a protrusion on the circumferential side of the core cord are provided between the upper support (2) and the lower support (3). A plurality of filter media (4) made of suspended suspended material are fixed in a suspended state by an upper suspension string (7) and a lower suspension string (8) at the ends of the filter medium, and a core string of the filter medium (4). Also, the upper suspension cord (7) and the lower suspension cord (8) are configured to be bendable and deformable along the flowing direction of water, and the upper support (2). Between the lower support (3) and the lower support (3), the length of the filter medium (4) (LB), the length of the upper hanging string (7) (Lb1), the length of the lower hanging string (8) ( L
b2) is a method of operating the turbidity removal apparatus (A) satisfying the following equations (1) to (3), which comprises performing a raw water treatment operation and a plurality of washing operations repeatedly. The operation of the turbidity removal device is characterized in that turbidity removal treated water is used for at least the final washing operation, and raw water is used for at least part of the previous washing operation. Method. ## EQU1 ## (Lb1 + LB + Lb2) <LA (1) LA <LB (2) (LB + Lb2) <LA <(LB + Lb1) (3) 2. Excluding the range corresponding to the length (Lb1) of the upper support (2) from the upper support (2), which satisfies the formulas (1 ′) to (3 ′) defined below. On the tower side of the region between the upper support (2) and the lower support (3) and excluding the ranges corresponding to 10% of the height of the region from the upper end and the lower end of the region, respectively. Uses a turbidity removal device equipped with an intermediate drainage pipe (54) with a valve (66), and the same (A) is used after a plurality of washing operations have been performed in each of the following operations (A) and (B). ) And (B) are performed again, The operating method according to claim 1. ## EQU00002 ## 1.01 × LA <(Lb1 + LB + Lb2) <2.00 × LA (1 ′) 1.01 × LB <LA <1.50 × LB (2 ′) 1.01 (LB + Lb2) <LA <1 0.01 (LB + Lb1) (3 ′) (A) Washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). 3. Excluding the range corresponding to the length (Lb1) of the upper support (2) from the upper support (2), which satisfies the formulas (1 ′) to (3 ′) defined below. On the tower side of the region between the upper support (2) and the lower support (3) and excluding the regions corresponding to 10% of the height of the region from the upper end and the lower end of the region, respectively. Uses a turbidity removal device equipped with an intermediate drainage pipe (54) equipped with a valve (66), and after performing a plurality of washing operations each of the following operations (A) and (B), The operating method according to claim 1, which comprises performing each of the operations C) to (E). ## 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 0.01 (LB + Lb1) (3 ′) (A) Washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). (C) A total water removal process of extracting all the stored water in the tower from the bottom of the tower. (D) A washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (E) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). 4. The formulas (1 ′) to (3 ′) defined below are satisfied, and the length (Lb1) of the upper suspension string (7) from the upper support (2) is within a range of ± 10%. An intermediate drainage pipe (5) with a valve (66) is installed on the side of the tower below the corresponding distance.
4) is used, and the washing operation is performed a plurality of times for each of the following operations (A) and (B), and then each operation (A) and (B) is performed again. The method of operation according to claim 1, comprising performing the operation. ## EQU00004 ## 1.01 × LA <(Lb1 + LB + Lb2) <2.00 × LA (1 ′) 1.01 × LB <LA <1.50 × LB (2 ′) 1.01 (LB + Lb2) <LA <1 0.01 (LB + Lb1) (3 ′) (A) Washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). 5. The formulas (1 ′) to (3 ′) defined below are satisfied, and the length (Lb1) of the upper suspension string (7) from the upper support (2) is within a range of ± 10%. An intermediate drainage pipe (5) with a valve (66) is installed on the side of the tower below the corresponding distance.
4) is used, the washing operation is performed a plurality of times, and then each of the following operations (A) and (B) is performed, and then each of the following operations (C) to (E) is performed. The operating method according to claim 1, which comprises: ## EQU00005 ## 1.01 × LA <(Lb1 + LB + Lb2) <2.00 × LA (1 ′) 1.01 × LB <LA <1.50 × LB (2 ′) 1.01 (LB + Lb2) <LA <1 0.01 (LB + Lb1) (3 ′) (A) Washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (B) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54). (C) A total water removal process of extracting all the stored water in the tower from the bottom of the tower. (D) A washing operation in which washing water and air are supplied from the tower bottom and discharged from the tower top. (E) After stopping the supply of washing water and air in a state where the lower suspension string (8) and the filter medium (4) extend upward in the tower,
Partial drainage process of draining stored water in the tower from the intermediate drainage pipe (54).