JP6386860B2 - Muddy water treatment apparatus and muddy water treatment method - Google Patents

Description

  The present invention relates to a muddy water treatment apparatus and a muddy water treatment method for concentrating muddy water.

  For the treatment of turbid water generated at construction sites, etc. and for the treatment of turbid water associated with the purification of relatively small closed water areas, removal of suspended substances (SS components such as clay, silt, cement components, etc.) in muddy water It is an inevitable requirement for solidification and dehydration.

  In such turbid water treatment, for example, in the purification of drinking water, after removing suspended substances in turbid water to some extent by agglomeration treatment using a chemical such as a flocculant as a pretreatment, the treatment is further performed by filtration treatment such as sand filtration. Getting water is done.

  In the flocculation treatment, treatment equipment composed of a flocculating agent stirring tank, a flocculation / separation separation water tank, a pH adjustment tank, a neutralization tank, etc. is required. A water tank is required. Furthermore, since the flocculant is mixed into the discharged dehydrated cake, in many cases, disposal as industrial waste is required, which is a problem from the viewpoint of recycling and cost.

  As a turbid water treatment apparatus that does not use chemicals such as a flocculant used for pretreatment, for example, in Patent Document 1, a membrane module in which a separation membrane is arranged in a filtration tank is immersed, and a membrane module is used using a pump. In the filtration method of polluted water that performs filtration through the membrane module using the suction pressure by suctioning the secondary side of the water or the pressure due to the head difference on the water surface as the transmembrane differential pressure, the primary side from the secondary side of the membrane module using a compressor A method for filtering contaminated water is described in which the membrane module is subjected to a cleaning process by aerating air to the side.

  However, in the turbid water treatment apparatus, when a pump and a compressor are used in combination as in Patent Document 1, the cost of equipment increases.

JP-A-9-168727

  The objective of this invention is providing the muddy water processing apparatus and muddy water processing method which can concentrate muddy water with a simple structure.

The present invention is a turbid water treatment apparatus for treating turbid water containing a suspended substance, and a transfer channel for connecting a turbid water storage source and an upper part of the filtration tub to filter muddy water. And at least one hollow filter medium for performing a filtration treatment by immersing in turbid water in the filter tank, and a vacuum suction means whose suction side is connected to the middle of the transfer flow path and inside the filter medium , In the middle of the transfer flow path and the suction side of the vacuum suction means is in a non-communication state, the turbid water storage source and the upper portion of the filtration tank is in communication, and the inside of the filter medium and the The suction side of the vacuum suction means is in a communication state, and the others are in a state where the filtration tank is sealed, and vacuum suction is performed by the vacuum suction means to form a negative pressure in the filtration tank through the filter medium. The muddy water is taken into the filtration tank by It is seen, in a state in which the filter medium was immersed in the turbid water, after depositing the suspended matter on the surface of the filter medium by filtering the turbid water, a reservoir source of the turbid water and the upper portion of the filter tank In the non-communication state, the upper portion of the filtration tank and the suction side of the vacuum suction means are in communication state, the inside of the filter medium and the suction side of the vacuum suction means are in non-communication state, and the filter medium The inside is in a communication state with the atmosphere side, and the other is in a state where the filtration tank is sealed, the atmosphere is taken into the filter medium by the vacuum suction means, and the filter medium is immersed in the turbid water. It is a muddy water treatment apparatus which peels the suspended substance adhering to the surface of the said filter medium by discharging | emitting outside the said filter medium.

  In the muddy water treatment apparatus, it is preferable that the filter medium is provided so as to be positioned inside, and includes an inner tube having an upper end and a lower end opened.

  In the muddy water treatment apparatus, it is preferable that the muddy water treatment apparatus includes a bonded portion or a swelling suppressing member by sewing, welding or the like for suppressing swelling of the filter medium at the time of peeling.

The present invention is also a turbid water treatment method for treating turbid water containing suspended substances, wherein at least one hollow filter medium is installed in a filtration tank for filtering turbid water, A storage source and the upper part of the filtration tank are connected by a transfer channel, and a suction side is connected to the middle of the transfer channel and the inside of the filter medium. The suction side of the suction means is in a non-communication state, the turbid water storage source and the upper part of the filtration tank are in a communication state, and the inside of the filter medium and the suction side of the vacuum suction means are in a communication state. In a state where the filtration tank is sealed , the muddy water is taken into the filtration tank by forming a negative pressure in the filtration tank through the filter medium by vacuum suction , and the filter medium is taken into the muddy water. The muddy water is filtered while immersed in After depositing the suspended matter on the surface of the filter medium Te, and an upper of said filter tank and the reservoir source of the turbid water to a non-communicating state, a suction side of the upper and the vacuum suction means of the filter tank a communication state, a suction side of the internal and the vacuum suction means of the filtering material and a non-communicating state, and the inside of the filter media to the atmosphere side and the communication with the others the vacuum while sealing the filter tank The air is taken into the filter medium by vacuum suction by a suction means , and the filter medium is immersed in the muddy water, and the air is discharged to the outside of the filter medium on the surface of the filter medium. This is a muddy water treatment method for peeling off adhering suspended solids.

  The present invention provides a turbid water treatment apparatus capable of concentrating turbid water with a simple configuration using vacuum suction means.

It is a schematic block diagram which shows an example of the muddy water processing apparatus which concerns on embodiment of this invention, and is a schematic diagram which shows a vacuum suction filtration process. It is a schematic block diagram which shows an example of the muddy water processing apparatus which concerns on embodiment of this invention, and is the schematic which shows an underwater peeling process. It is a schematic block diagram which shows the other example of the muddy water processing apparatus which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the muddy water processing apparatus which concerns on embodiment of this invention. It is a schematic block diagram which shows the other example of the muddy water processing apparatus which concerns on embodiment of this invention. It is the schematic which shows an example of a structure of the filter medium in the muddy water processing apparatus which concerns on embodiment of this invention. It is a schematic structure figure showing an example of a muddy water treatment system provided with a muddy water treatment device concerning an embodiment of the present invention.

  Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

<Muddy water treatment>
A schematic configuration of an example of a muddy water treatment apparatus according to an embodiment of the present invention is shown in FIG. 1, and the configuration will be described. The muddy water treatment apparatus 1 according to the present embodiment is mainly used for filtering and concentrating muddy water. The muddy water treatment apparatus 1 is connected to a filter tank 10 for filtering muddy water, at least one hollow filter medium 12 for performing a filtration process by immersing in muddy water in the filter tank 10, and the filter medium 12. And a vacuum suction device 14 as vacuum suction means.

  In the muddy water treatment apparatus 1 of FIG. 1, one end of the transfer channel 20 is immersed in the muddy water to be treated in the muddy water tank 34 to be treated which is a turbid water storage source, and the other end is connected to the opening 32 at the top of the filtration tank 10. A three-way valve 28 is provided in the middle of the transfer channel 20. The filter medium 12 has a hollow shape, and is connected to the suction side of the vacuum suction device 14 through an opening 30 provided in the upper part of the filter tank 10 by a pipe 16 connected to the inside of the filter medium 12. The filtration tank 10 may be sealed. Three-way valves 24 and 26 are provided in the middle of the pipe 16. The three-way valve 28 and the three-way valve 26 are connected by a pipe 22. A discharge port 46 is provided in the lower part of the filtration tank 10 through a valve 44. In the example of FIG. 1, the muddy water treatment apparatus 1 has one filter medium 12, but the number of filter mediums 12 may be at least one and may be two or more, and is not limited thereto. Absent.

  Next, the operation of the muddy water treatment apparatus 1 and the muddy water treatment method will be described with reference to FIGS.

  As shown in FIG. 1, the three-way valve 28 communicates with the muddy water tank 34 to be treated and the opening 32 of the filtration tank 10, and the three-way valves 24 and 26 communicate with the opening 30 of the filtration tank 10 and the vacuum suction device 14. As a state, the vacuum suction device 14 is operated to start vacuum suction. By vacuum suction, a negative pressure is formed in the filtration tank 10 through the filter medium 12, and muddy water to be treated such as turbid water containing suspended substances (SS component) from the muddy water tank 34 to be treated through the transfer channel 20. The turbid water to be treated is filtered by the filter medium 12 (vacuum suction filtration step). The filtered water filtered by the filter medium 12 is discharged out of the system through the pipe 16. On the other hand, suspended matter or the like that is a filtrate is attached to the surface of the filter medium 12.

  When the filtration tank 10 is sealed, when the muddy water to be treated reaches the upper end of the filter medium 12, the residual air at the upper part of the filtration tank 10 is not discharged, so that the rise in the water level stops. Since the vacuum suction is continued, the amount of treated muddy water equivalent to the amount of filtered water discharged out of the system through the filter medium 12 is continuously supplied into the filtration tank 10, and the water level in the filtration tank 10 is almost the same. Kept constant. With this configuration, the muddy water to be treated can be automatically supplied to the filtration tank 10 from the muddy water tank 34 to be treated, which is a turbid water storage source, by vacuum suction. Moreover, since the water level of the muddy water in the filtration tank 10 is kept substantially constant, it is not necessary to perform water level management by a sensor, a float valve, or the like.

  In addition, if it restrict | limits to a vacuum suction filtration process, a turbid water may be supplied to the filtration tank 10 using a pump etc., and a filtration process may be performed using a vacuum suction device and a hollow filter medium, and the filtration tank 10 is sealed. It does not have to be.

  When suspended substances such as sludge adhere to the surface of the filter medium 12, the water permeability decreases and the amount of filtered water decreases. Therefore, with the vacuum suction device 14 operating, as shown in FIG. 2, the three-way valves 26 and 28 are in communication with the opening 32 of the filtration tank 10 and the vacuum suction device 14, and the three-way valve 24 is connected to the atmosphere side. A communication state with the opening 30 of the filtration tank 10 is established. Suspended substances such as sludge adhering to the surface of the filter medium 12 are obtained when the air is sucked from the opening of the three-way valve 24 and taken into the filter medium 12 and discharged from the surface of the filter medium 12. Peel and fall (underwater peeling process). The rise in the water level in the filter tank 10 due to the expansion of the filter medium 12 may be absorbed by providing a space above the filter medium 12 in the filter tank 10. When suspended substances such as sludge adhering to the surface of the filter medium 12 are sufficiently separated, the vacuum suction device 14 may be stopped. The concentrated slurry is discharged from the discharge port 46 with the valve 44 opened (discharge process). By repeating the vacuum suction filtration process, the underwater peeling process and the discharging process, the turbid water is concentrated.

  With this configuration, an efficient concentration process can be realized by a simple means such as a vacuum suction device without using an air supply device such as a compressor. As a result, it is possible to further reduce the equipment cost, improve workability, and save space by reducing the incidental equipment and simplifying the apparatus.

  Moreover, in this processing method, since it is not necessary to use a flocculant, it is not necessary to provide a water tank such as a flocculant stirring tank, a pH adjustment tank, or a neutralization tank, which leads to a reduction in equipment. Since it does not contain additives such as flocculants, it is not necessary to treat the cake with industrial waste, and it can be reused on-site, resulting in a high cost reduction effect.

  The muddy water tank 34 to be treated is not particularly limited as long as it stores muddy water to be treated and can connect or immerse at least one end of the transfer channel 20. In the muddy water treatment apparatus 1 of FIGS. 1 and 2, one end of the transfer channel 20 is immersed in the muddy water to be treated in the muddy water tank 34 to be treated, and vacuum suction processing is performed, but without providing the muddy water tank 34 to be treated, One end of the transfer channel 20 may be directly immersed in a processing target such as a pond, a river, a lake, or the like, and vacuum suction processing may be performed.

  The transfer channel 20 may be connected to any position of the filtration tank 10.

  The discharge port 46 should just be provided in the lower part of the filtration tank 10, and may be provided in the lower side surface of the filtration tank 10. FIG.

  Although the flow paths in the vacuum suction filtration process and the underwater separation process are switched using the three-way valves 24, 26, and 28, the flow paths may be switched using a two-way valve, and there is no particular limitation.

  The vacuum suction device 14 is not particularly limited as long as it can perform vacuum suction, and examples thereof include a vacuum pump and an ejector, and a device having a high degree of vacuum and a high displacement is preferable.

  The introduction of air into the filter medium 12 may be introduced from the upper part or the lower part of the filter medium 12, but sludge and the like can be peeled off from the surface of the filter medium in a substantially uniform state. In this respect, it is preferable to introduce from the bottom.

  The filter medium 12 used for the muddy water treatment is, for example, a cloth material, which has a filtration function that allows moisture to pass through but does not allow a suspended substance or the like of a predetermined size to pass therethrough. Appropriate ventilation is provided so that gas is discharged from the outside. The shape and material of the filter medium 12 are not particularly limited as long as they can capture and separate suspended substances from water to be treated such as turbid water. What is necessary is just to select the shape and material of the filter medium 12 according to the property of the to-be-processed water used as a process target, the property, etc. of the suspended substance contained. The shape of the filter medium 12 is not particularly limited as long as it is hollow. For example, a cylindrical shape such as a cylindrical shape, an elliptical cylindrical shape, or a polygonal cylindrical shape, a plate shape, a spherical shape, or a polygonal shape. The plate shape is preferable. In order to increase the filtration area, it is preferable that the filter medium is configured not to swell as much as possible, and as much filter medium as possible be installed in the filter tank.

  For example, a plate-shaped filter medium 12 having one or more filter chambers 50 as shown in FIG. 6 can be used. The filter medium 12 shown in FIG. 6 has a configuration in which one or more filter chambers 50 are formed by a bonding portion 52 in which a filter cloth is bonded by sewing or welding. The filtered water filtered by the filter medium 12 is discharged from the inside of each filter chamber 50 through the lower water collection pipe 54. Each filter chamber 50 may be inserted with a plate-like panel material or the like having a flow path through which filtered water passes.

  As shown in FIG. 6, a bulge suppressing member 36 that suppresses the bulge of the filter medium during peeling may be installed so as to cover both side surfaces of the filter medium 12. With this configuration, since the swelling of the filter medium is suppressed in the underwater peeling process, as shown in FIG. 3, when installing a plurality of filter mediums 12 in the filter tank 10 so as to face each other, the filter medium is closer to each other. 12 can be arranged, and efficient filtration can be performed.

  Examples of the swelling suppression member 36 include a net-like rigid member. Moreover, it is good also as a structure which suppresses the swelling of the filter medium 12 by providing many filter chambers 50 by the bonding part 52 etc. by sewing processing or welding as shown in FIG.

  As shown in FIG. 4, an inner cylinder pipe 38 may be provided in the filtration tank 10 so that the filter medium 12 is positioned inside, and the upper end and the lower end are open. With this configuration, in the underwater peeling process, the air exhausted from the filter medium 12 rises in the inner cylinder pipe 38, a specific gravity difference is generated inside and outside the inner cylinder pipe 38, and a water flow is generated upward from the lower part. To do. Thereby, washing | cleaning of the surface of the filter medium 12 by a gas-water mixed flow and underwater peeling by the air from the inside of the filter medium 12 are performed, and more efficient underwater peeling can be performed.

  As shown in FIG. 5, a plurality of filter media 12 may be installed in a multistage and a plurality of rows in the filter tank 10. In the example of FIG. 5, the filter media 12 are installed in two stages and two rows, but the present invention is not limited to this. Each filter medium 12 is provided with a swelling suppression member 36 so as to cover both side surfaces of the filter medium 12. Moreover, the inner cylinder pipe 38 is installed so that all the filter media 12 may be located inside. The lower part of each upper filter medium 12 is provided through an opening 30a and a valve 40, and the lower part of each lower filter medium 12 is provided through an opening 30b and through a valve 42 via a pipe 16 and the suction side of the vacuum suction device 14. Connected with.

  The three-way valve 28 is connected to the muddy water tank 34 to be treated and the opening 32 of the filtration tank 10, and the three-way valves 24 and 26 are connected to the openings 30 a and 30 b of the filtration tank 10 and the vacuum suction device 14. , 42 are opened, and the vacuum suction device 14 is operated to start vacuum suction. By being sucked in vacuum, a negative pressure is formed in the filtration tank 10 through each filter medium 12, and muddy water to be treated such as muddy water containing suspended substances (SS component) from the muddy water tank 34 to be treated through the transfer channel 20. Is transferred to the filtration tank 10, and the turbid water to be treated is filtered by each filter medium 12 (vacuum suction filtration process). The filtered water filtered by each filter medium 12 is discharged out of the system through the pipe 16. On the other hand, suspended matter or the like that is a filtrate is attached to the surface of each filter medium 12.

  When suspended substances such as sludge adhere to the surface of each filter medium 12, the water permeability decreases and the amount of filtered water decreases. Therefore, with the vacuum suction device 14 being operated, the three-way valves 26 and 28 are brought into communication with the opening 32 of the filtration tank 10 and the vacuum suction device 14, and the three-way valve 24 is connected to the atmosphere side and the opening 30 a of the filtration tank 10. , 30b, the atmosphere is sucked from the opening of the three-way valve 24 and taken into the filter media 12. The air exhausted from the filter medium 12 rises in the inner tube 38, a specific gravity difference is generated inside and outside the inner tube 38, and a water flow is generated upward from the lower part. Thereby, washing | cleaning of the surface of each filter medium 12 by an air-water mixed flow and underwater peeling by the air from the inside of each filter medium 12 are performed, and more efficient underwater peeling can be performed. When the suspended substances such as sludge adhering to the surface of each filter medium 12 are sufficiently separated, the valve may be switched to enter the vacuum suction filtration process.

  In addition, after the vacuum suction filtration step, as another method, the three-way valves 26 and 28 are kept in communication with the opening 32 of the filtration tank 10 and the vacuum suction device 14 while the vacuum suction device 14 is operated. When the three-way valve 24 is in a communication state between the atmosphere side and the openings 30a and 30b of the filtration tank 10, the atmosphere is sucked from the openings of the three-way valve 24 and the lower filter media 12 are in the closed state. Captured inside. The air discharged from the lower filter media 12 rises in the inner cylinder pipe 38, a specific gravity difference is generated inside and outside the inner cylinder pipe 38, and a water flow is generated upward from the lower part. Thereby, primary cleaning of the surface of each upper filter medium 12 by the air-water mixed flow is performed, and then when the upper valve 40 is opened, the air from the inside of each upper filter medium 12 The underwater peeling is performed. In this way, by performing the underwater peeling sequentially from the lower stage to the upper stage, it is possible to perform more efficient underwater peeling.

  In FIG. 7, schematic structure of an example of the muddy water processing system provided with the muddy water processing apparatus 1 which concerns on embodiment of this invention is shown. In the turbid water treatment system 3 in FIG. 7, pre-filtration treatment using the vacuum suction device 14 is performed on the turbid water from the muddy water tank 34 to be treated in the muddy water treatment apparatus 1 including the filtration tank 10 and the filter medium. The obtained filtered water is stored in the water storage tank 60 as necessary, and then sent to the filtration processing device 62 and filtered to obtain treated water. The filtration device 62 is not particularly limited as long as it performs a filtration treatment, and examples thereof include a sand filtration device and an advanced water treatment device using a hollow fiber.

  Examples of the muddy water to be treated by the muddy water treatment apparatus according to this embodiment include muddy water generated at civil engineering / construction sites, muddy water, soil due to bottom sediment improvement and dredging of rivers / lakes / ponds / canals, etc. Examples include, but are not limited to, muddy water after washing, muddy water containing clay and silt, muddy water containing chemical substances such as cement components, and the like. For example, various muddy water treatments from the discharge level to the pretreatment of drinking water generation (advanced treatment) are possible.

  Hereinafter, although an example and a comparative example are given and the present invention is explained more concretely in detail, the present invention is not limited to the following examples.

[Example 1]
As shown in FIG. 3, a hollow flat plate is used as a filter medium 12 in a cylindrical resin filtration tank 10 (inner diameter 230 mm, height 1000 mm, volume 40 L / m) having two openings 30 and 32 installed at the top. 2 pieces of filter cloth (air permeability 100 cm ³ / cm ² / min, width 90 mm × height 230 mm, filter cloth area 414 cm ² ) (total filter cloth area 828 cm ² ) are installed facing each other and transferred The pipe | tube used as the path | route 20 was immersed in the to-be-processed muddy water tank 34 through the three-way valve | bulb 28. FIG. The filter cloth was connected to the opening 30 by the pipe 16 and connected to the suction side of the vacuum suction device 14 via the three-way valves 24 and 26. The three-way valve 26 and the three-way valve 28 were connected by a pipe 22. On both surfaces of each flat filter cloth, a net-like rigid member (width 110 mm × height 250 mm) was installed as the swelling suppression member 36.

  The filtration tank 10 is sealed, the three-way valve 28 is in communication with the muddy water tank 34 to be treated and the opening 32 of the filtration tank 10, and the three-way valves 24 and 26 are in communication with the opening 30 of the filtration tank 10 and the vacuum suction device 14. When vacuum suction was started as a state, a negative pressure was formed in the filtration tank 10 through the filter cloth, and the muddy water in the muddy water tank 34 to be treated rose to the upper end of the filter cloth in the filtration tank 10. Even if filtered water was discharged out of the system, this state was always maintained (the water level was constant), and the filtration process was continued.

  As shown in FIG. 3, with the vacuum suction device 14 being operated, the three-way valves 26 and 28 are in communication with the opening 32 of the filtration tank 10 and the vacuum suction device 14, and the three-way valve 24 is connected to the atmosphere side and the filtration tank. The communication with 10 openings 30 was established. Due to the negative pressure formed in the upper part of the filtration tank 10, the air is sucked from the opening of the three-way valve 24 (intake amount: about 400 L / min), and the air is discharged through the filter medium 12. Suspended substances such as sludge adhering to the surface of 12 peeled off.

  Thus, it was possible to concentrate turbid water with a simple configuration using a vacuum suction means without using an air supply device such as a compressor. Moreover, the swelling of the filter cloth was suppressed by the swelling suppressing member.

  DESCRIPTION OF SYMBOLS 1 Turbid water treatment apparatus, 3 Turbid water treatment system, 10 Filtration tank, 12 Filter material, 14 Vacuum suction apparatus, 16, 22 Piping, 20 Transfer flow path, 24, 26, 28 Three-way valve, 30, 30a, 30b, 32 Opening part , 34 Muddy water tank to be treated, 36 Swelling suppression member, 38 Inner tube, 40, 42, 44 Valve, 46 Discharge port, 50 Filtration chamber, 52 Laminating section, 54 Lower water collection pipe, 60 Water storage tank, 62 Filtration treatment device .

Claims (4)

A muddy water treatment device for treating muddy water containing suspended matter,
A filtration tank for filtering muddy water;
A transfer flow path connecting the muddy water storage source and the upper part of the filtration tank;
At least one hollow filter medium for performing a filtration treatment by immersing in muddy water in the filtration tank;
A vacuum suction means whose suction side is connected in the middle of the transfer flow path and inside the filter medium;
With
The middle of the transfer flow path and the suction side of the vacuum suction means are in a non-communication state, the turbid water storage source and the upper part of the filtration tank are in a communication state, and the inside of the filter medium and the vacuum suction means The suction side is in a communicating state, and the other is in a state where the filtration tank is sealed, and the turbid water is formed by forming a negative pressure in the filtration tank through the filter medium by vacuum suction by the vacuum suction means. Incorporated into the filtration tank, in a state where the filter medium is immersed in the muddy water, after filtering the muddy water and attaching the suspended matter to the surface of the filter medium,
The turbid water storage source and the upper part of the filtration tank are in a non-communication state, the upper part of the filtration tank and the suction side of the vacuum suction means are in a communication state, and the inside of the filter medium and the suction side of the vacuum suction means to separate the the non-communicated state, and the inside of the filter media to the atmosphere side and the communication with other takes the air inside the filtering material by the vacuum suction means in a closed state of the filter tank, the filter media A muddy water treatment apparatus, wherein the suspended matter attached to the surface of the filter medium is peeled off by discharging the air to the outside of the filter medium in a state of being immersed in the muddy water. The muddy water treatment device according to claim 1,
A muddy water treatment apparatus comprising an inner tube having an upper end and a lower end that are installed so that the filter medium is located inside. The muddy water treatment apparatus according to claim 1 or 2,
A muddy water treatment apparatus comprising a bonding portion or a swelling suppressing member for suppressing swelling of the filter medium during the peeling. A muddy water treatment method for treating muddy water containing suspended matter,
At least one hollow filter medium is installed in a filtration tank for filtering turbid water, the storage source of the turbid water and the upper part of the filtration tank are connected by a transfer channel, and the suction side is the transfer channel. Using vacuum suction means connected in the middle and inside the filter medium, the middle of the transfer flow path and the suction side of the vacuum suction means are in a non-communication state, the turbid water storage source and the upper part of the filtration tank, And the inside of the filter medium and the suction side of the vacuum suction means are in a communication state, and the others are in a state where the filter tank is hermetically sealed, and the filter tank is passed through the filter medium by vacuum suction. The turbid water is taken into the filtration tank by forming a negative pressure therein, and the suspended matter is filtered on the surface of the filter medium by filtering the turbid water in a state where the filter medium is immersed in the muddy water. After attaching
The turbid water storage source and the upper part of the filtration tank are in a non-communication state, the upper part of the filtration tank and the suction side of the vacuum suction means are in a communication state, and the inside of the filter medium and the suction side of the vacuum suction means And the inside of the filter medium is in communication with the atmosphere side, and the others are taken in the atmosphere of the filter medium by vacuum suction with the vacuum suction means with the filter tank sealed. A turbid water treatment method characterized in that the suspended material adhering to the surface of the filter medium is peeled off by discharging the air to the outside of the filter medium in a state where the filter medium is immersed in the muddy water.

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