JP2021013881A - Turbid water treatment device and turbid water treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a compact treatment apparatus having both sedimentation separation and floating separation, pretreatment of raw water (turbid water) becomes unnecessary, it can be operated even in a narrow installation place, and it can be operated according to the properties of turbid water. The separation process is smoothly performed by changing the order of the sedimentation separation process and the levitation separation process. SOLUTION: A tubular settling separation tank 2 for separating raw water (turbid water) into a slurry and settling treated water, and a multi-cylindrical settling treated water provided on the outer periphery of the settling separation tank 2 are discharged to the bottom. A storage adjustment tank 12 having a sedimentation treated water drain port 13 for temporarily storing the treated water after sedimentation separation overflowing from the upper edge of the sedimentation separation tank 2, and raw water (turbid water) or treated water floated as a scum. The floating separation tank 3 that separates into the treated water, the transport pipe 8 for the sedimentation separation tank that transports the raw water (turbid water) or the treated water to the center well portion 7, and the sedimentation treatment water from the storage adjustment tank 12 are the floating separation tank. A transport pipe 14 for a floating separation tank for transporting to No. 3 was provided. [Selection diagram] Fig. 1

Description

The present invention relates to a technique for purifying turbid water generated in construction work and the like, and particularly relates to a turbid water treatment apparatus capable of performing sedimentation treatment and levitation treatment on turbid water with a compact apparatus and a treatment method thereof.

Muddy water is discharged almost without exception in construction work. Regarding the discharged turbid water, it is necessary to comply with the standards set by the Water Pollution Control Law and the ordinances established by each prefecture. It is strictly regulated by the Water Pollution Control Law and regulations on turbid water.

Conventionally, when treating turbid water or the like, a two-stage treatment facility (equipment) of a coagulation sedimentation treatment facility (device) and a levitation treatment facility (device) has been used. The coagulation sedimentation treatment (equipment) temporarily stores the turbid water discharged during construction work in the raw water tank. From here, it is transferred to a coagulation sedimentation device, where solid particles suspended in turbid water are separated from the liquid by gravity sedimentation to purify the turbid water. Inorganic coagulant, organic coagulant, carbon dioxide gas and the like are mixed during the transfer from the raw water tank to the coagulation sedimentation device. At this time, a rapid mixer is used.

The raw water mixed with the coagulant in this way is placed in a coagulation sedimentation device and settled and separated into sludge and separated water. This separated water is post-treated and discharged into public water bodies.
The settled sludge is discharged by a screw conveyor or the like below the coagulation settling device. This discharged sludge is concentrated with a concentrator to make a cake. The filtered water generated at this time is temporarily stored in the drainage pit and then transferred to the raw water tank.

On the other hand, in the levitation treatment (device), first, raw water (turbid water) is made to flow into the raw water tank and stored. Transfer to a raw water adjustment tank to make the raw water (turbid water) uniform. This raw water adjustment tank is not an essential facility (equipment). Next, chemicals are charged in the condition tank, and the surveyed raw water (turbid water) is charged into the floating separation tank. In this floating separation tank, fine bubbles are attached to suspended solids in turbid water to reduce the apparent specific gravity of the suspended solids, and the suspended solids float on the water surface and are discharged as scum. On the other hand, the settled sludge in raw water (turbid water) is discharged as a slurry. The levitation treated water treated in the levitation separation tank is transferred to a neutralization tank, adjusted in pH, and discharged as treated water.

Many techniques for treating turbid water in this way have been proposed. For example, in Japanese Patent Application Laid-Open No. 2008-119563 "Muddy Water Treatment Device" of Patent Document 1, a raw water tank, a slow-speed stirring tank, and raw water in the raw water tank are sent to a slow-speed stirring tank on a portable stand. The first feeding means to be supplied, the coagulant supplying means for supplying the coagulant to the coagulant injection portion in the middle of the first feeding means, and the treated water in the slow stirring tank are fed to the sedimentation separation tank and the like. A turbid water treatment device provided with a second feeding means for feeding has been proposed.

Japanese Unexamined Patent Publication No. 2008-119563

However, in the conventional sedimentation treatment device, when the flocs carry over to the treated water, or when further advanced treatment of the treated water is required due to the additional drainage standard, another treatment device such as sand filtration is used. It is necessary to provide it additionally. A large space is required to install the processing equipment.

As a pretreatment for the sedimentation treatment, it was necessary to remove what floated in advance. For example, a processing device such as oil separation was required. In addition, as a pretreatment for levitation separation, it was necessary to remove sedimented substances such as fine sand in advance. These were often separated only by gravity, and the installation area of the processing equipment tended to be large.

It is necessary to select a water treatment method when planning a facility for such turbid water treatment. Even if it is better to change the method when the properties of the raw water change, there is a problem that it cannot be changed without waiting for the next renewal time. It was difficult to deal with changes in the amount of treatment and the properties of water during the operation of the treatment facility.

The "turbid water treatment device" described in Patent Document 1 has a problem that a raw water tank, a slow-speed stirring tank, a sedimentation separation tank, and a feeding means are required for each of them, and the treatment installation place tends to be wide. ..

The present invention has been devised to solve such a problem. That is, an object of the present invention is to make an integrated treatment device having both sedimentation separation and floating separation, which eliminates the need for pretreatment of raw water (turbid water), and can be operated even in a narrow installation place. It is an object of the present invention to provide a turbid water treatment apparatus and a treatment method thereof capable of smoothly performing the separation treatment by changing the order of the sedimentation separation and the floating separation treatment according to the properties of the turbid water.

The turbid water treatment device of the present invention is a multi-cylindrical turbid water treatment device (1) that sequentially treats sedimentation separation and floating separation of turbid water generated at construction work and construction sites.
A tubular sedimentation separation tank (2) having a slurry discharge port (4) at the bottom for separating raw water (turbid water) into slurry and sedimentation treated water.
A tubular center well portion (7) for pouring raw water to which a coagulant is added, which is attached to the inside of the sedimentation separation tank (2) from the upper part to the lower part.
Overflow from the upper edge of the sedimentation separation tank (2), which is provided on the outer periphery of the sedimentation separation tank (2) in a multi-cylindrical shape and has a sedimentation treatment water drain port (13) at the bottom for discharging the sedimentation treatment water. A storage adjustment tank (12) that temporarily stores the treated water after sedimentation and separation,
A scum discharge tank (17) having a scum discharge port (15) for discharging scum at the upper part and a settling treated water inlet (16) for charging settling treated water at the lower part, and a partition wall (18) adjacent thereto. A levitation separation tank (3) that separates raw water (turbid water) or treated water into scum and levitation treated water, which is composed of a levitation treated water discharge tank (19) that communicates below.
A transport pipe (8) for a sedimentation separation tank that transports raw water (turbid water) or treated water to the center well portion (7), and
It is characterized by including a transport pipe (14) for a levitation separation tank, which transports sedimentation treated water from the storage adjustment tank (12) to the levitation separation tank (3).

The transport pipe (14) for the floating separation tank can be formed in a spiral shape so as to be wound around the storage adjustment tank (12).
It is preferable that the floating treated water discharge tank (19) is provided with a level-adjusted discharge cylinder (20) for overflowing and discharging the floating treated water in the vertical direction.

The turbid water treatment method of the present invention is a turbid water treatment apparatus (1) in which a storage adjustment tank (12) and a floating separation tank (3) are provided outside a sedimentation separation tank (2) for turbid water generated at a construction site or a construction site. It is a turbid water treatment method using a multi-cylindrical turbid water treatment device that sequentially processes sedimentation separation and levitation separation using.
First, a flocculant is added to raw water (turbid water) and charged into the center well portion (7) in the sedimentation separation tank (2).
Raw water (turbid water) is separated from the center well portion (7) into sedimented slurry and sedimented treated water in the sedimentation separation tank (2).
Next, the sedimentation treated water after discharging the slurry in the sedimentation separation tank (2) is transported to the storage adjustment tank (12).
Finally, after temporarily storing in the storage adjustment tank (12) to adjust the treatment amount, the sedimentation treated water is transported to the floating separation tank (3) and separated into floating scum and floating treated water. , The scum is discharged from the scum discharge port (15), and the levitation treated water is discharged from the levitation treated water discharge port (21) to the public water area to complete the treatment.

Further, the turbid water treatment method of the present invention is a turbid water treatment apparatus (3) provided with a storage adjustment tank (12) and a floating separation tank (3) outside the sedimentation separation tank (2) for turbid water generated at construction work or construction site. It is a turbid water treatment method using a multi-cylindrical turbid water treatment device that sequentially processes sedimentation separation and levitation separation using 1).
First, a flocculant is added to the raw water (turbid water) and put into the floating separation tank (3), where the scum and the floating treated water are separated, and the scum is discharged as it is.
Next, the levitation treated water is poured from the levitation separation tank (3) into the center well portion (7) of the sedimentation separation tank (2) through the transport pipe (8) for the sedimentation separation tank, and the slurry and the sedimentation treatment water are settled. Separated into
The sedimentation treated water after discharging the slurry in the sedimentation separation tank (2) is temporarily stored in the storage adjustment tank (12), and the sedimentation treatment water is discharged as it is from the sedimentation treatment water discharge port (13) to the public water area. It is characterized in that the process is completed.
When the levitation separation treatment is performed in the levitation separation tank (3), bubbles are generated in the levitation separation tank (3), and pollutants in raw water (turbid water) are adsorbed on the gas-liquid interface of the bubbles, and It can be concentrated, levitated and discharged.

Since the turbid water treatment device (1) of the present invention is a compact water treatment device having both sedimentation treatment and levitation treatment, it can be used even in a narrow installation area. This turbid water treatment device (1) can be easily transported and installed at a work site by a vehicle such as a trailer. In addition, semi-advanced processing that does not require sand filtration or the like becomes possible.
Since the storage adjustment tank (12) adjusts the treatment time of each of the slow-treatment sedimentation treatment and the fast-treatment levitation treatment, the overall treatment capacity is high.

Since the separation treatment may be performed first, either sedimentation or levitation, the order of sedimentation separation and levitation separation can be changed according to the properties of the turbid water. Separation treatment can be smoothly performed for turbid water having various properties.

If the transport pipe (14) for the floating separation tank is formed in a spiral shape so as to be wound around the storage adjustment tank (12), the transport distance of the raw water (turbid water) or the treated water becomes long. During the transportation of this long transport pipe, the reaction with chemicals (coagulant, pH adjuster, neutralizer, etc.) added to the raw water (turbid water) or the treated water is ensured.

Since the turbid water treatment method of the present invention has both sedimentation separation and floating separation, whichever comes first, it is possible to optimize the injection amount by utilizing the characteristics of each according to the properties of the raw water (turbid water). If necessary, the treated water can be subjected to floating separation or sedimentation separation treatment, wasteful use of chemicals can be avoided, and work costs can be reduced.

It is a vertical cross-sectional view which shows the turbid water treatment apparatus of this invention, and is expressed by a part system diagram. It is a top view which shows the turbid water treatment apparatus of this invention. It is a flow chart which shows the processing method which performs the sedimentation separation treatment using a turbid water treatment apparatus, and then float separation treatment. It is a vertical cross-sectional view of an apparatus showing a treatment method of performing sedimentation separation treatment and then floating separation treatment. The thick solid line in the figure indicates that raw water (turbid water) is being transported or treated, and (a) is during sedimentation separation treatment. , (B) shows the state during floating separation, and (c) shows the state of discharging treated water after the separation treatment. It is a flow chart which shows the treatment method which performs the floating separation treatment using the turbid water treatment apparatus, and then the sedimentation separation treatment. It is a normal cross-sectional view of the apparatus which shows the processing method which performs the levitation separation treatment and then the sedimentation separation treatment, the thick solid line in the figure represents the transporting and processing of raw water (turbid water), and (a) is the levitation separation treatment. , (B) shows the state during sedimentation separation, and (c) shows the state of discharging treated water after the separation treatment. It is a vertical cross-sectional view of the apparatus which shows the modification which used the separation screen instead of the levitation separation tank at the time of performing the process of performing the sedimentation separation process and then the levitation separation process.

The present invention is a compact water treatment device that has both sedimentation treatment and levitation treatment for raw water (turbid water) generated at construction work and construction site, and the treatment can be performed first for both sedimentation and levitation. Is.

<Overall configuration of turbid water treatment equipment>
Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a vertical cross-sectional view showing the turbid water treatment apparatus of the present invention, and is partially represented by a system diagram. FIG. 2 is a plan view showing the turbid water treatment apparatus of the present invention.
The turbid water treatment device 1 of the present invention is an apparatus capable of sequentially treating turbid water generated at a construction work or a construction site with a compact treatment device for sedimentation separation treatment and levitation separation treatment. The turbid water treatment device 1 has a tubular settling separation tank 2 that mainly separates turbid water, which is the raw water for treatment, into a slurry and settling treated water, and a floating separation that separates the settling treated water into scum and floating treated water. It is a processing device including a tank 3. The material of the turbid water treatment apparatus 1 of the present invention is determined by whether or not the turbid water to be treated is highly corrosive. For example, iron-based alloys such as iron, steel or stainless steel, and other non-ferrous metals are used. Furthermore, synthetic resins such as polyethylene (PE) and fiber reinforced plastic (FRP), and concrete can also be used.

Scum is called floating sludge, and the gas generated by the decay and fermentation of organic matter in raw water (turbid water) causes suspended substances, fibrous substances, oil lipids, and bacteria in the turbid water to float on the surface of the water. It is a spongy thick film-like float that can be formed. It floats on the surface of the water of the treatment equipment and varies from fine particles to large lumps over 30 cm.
A slurry is a mixture in which minerals, sludge, etc. are mixed in a liquid of raw water (turbid water), and is often a highly viscous fluid.
The settling treated water and the floating treated water are treated water treated by the turbid water treatment device 1 of the present invention. The sedimentation treated water is mainly treated water in which the slurry is separated from the raw water (turbid water). The levitation treated water is mainly treated water in which scum is separated from raw water (turbid water). These sedimentation-treated water and levitation-treated water may be discharged to the public water area as they are, or may be treated again and then discharged to the public water area.

<Structure of sedimentation separation tank>
The sedimentation separation tank 2 is a cylindrical water tank that separates raw water (turbid water) or treated water into slurry and sedimentation treated water. At the lower part of the sedimentation separation tank 2, there is a slurry discharge port 4 for discharging the slurry separated by sedimentation. An on-off valve 5 and a pump 6 are connected to the downstream of the slurry discharge port 4.

Inside the sedimentation separation tank 2, a tubular center well portion 7 for charging raw water (turbid water) to which a coagulant is added is coaxially attached to the sedimentation separation tank 2. The center well portion 7 and the tubular sedimentation separation tank 2 have a double tubular shape. This makes the water treatment device compact. The center well portion 7 is attached from the upper part to the lower part of the sedimentation separation tank 2. As shown in FIG. 1, the upper edge portion of the center well portion 7 is located at a position higher than the upper edge portion of the floating separation tank 3 described later. This is to prevent the separated treated water, scum, etc. from flowing in.

The raw water (turbid water) is transported to the center well portion 7 using the transport pipe 8 for the sedimentation separation tank. The upstream of the transport pipe 8 for the sedimentation separation tank is connected to a raw water tank (not shown) or the like. This raw water tank temporarily stores turbid water generated at construction works and construction sites, removes those that easily float and settle, and uses the settled water as raw water. The sedimentation separation tank transport pipe 8 is a transport pipe for transporting raw water (turbid water) from the raw water tank to the center well portion 7 by adding a coagulant to the raw water tank pump. This raw water tank is not necessarily an indispensable device (equipment).

As shown in the figure, the bottom of the sedimentation separation tank 2 has a ship bottom shape so that slurry can be easily collected. A screw-shaped slurry scraper 11 is attached to the bottom of the ship bottom. The slurry scraper 11 has a function of stirring the precipitated slurry and discharging it from the slurry discharge port 4 to the outside. Needless to say, the bottom of the sedimentation separation tank 2 is not limited to this ship bottom shape. Further, the slurry scraper 11 is not limited to this screw shape, and for example, a rotary blade type shape can be used.

Although not shown, the center well portion 7 may be provided with a stirrer inside. This stirrer has a slow sand stirrer attached to the shaft. The slow sand stirring blade has a function of stirring raw water (turbid water).

<Structure of storage adjustment tank>
A storage adjustment tank 12 is provided on the outer periphery of the sedimentation separation tank 2 in a multi-cylindrical shape. This is to make the water treatment device compact due to the multiple cylinder shape. The storage adjustment tank 12 is a tank that temporarily stores the treated water after the sedimentation separation that overflows from the upper edge of the sedimentation separation tank 2. The processing time of the floating separation tank 3 described later is faster than that of the sedimentation separation tank 2. Therefore, it is necessary to store the sedimentation treated water treated in the sedimentation separation tank 2 in the storage adjustment tank 12 to some extent and adjust the treatment amount.

At the bottom of the storage adjustment tank 12, there is a settling-treated water drainage port 13 for draining the settling-treated water, and an on-off valve 5 is connected to the downstream of the settling-treated water drainage port 13. By opening and closing the on-off valve 5, raw water (turbid water) can be treated into clean treated water and discharged into public water areas such as rivers and the sea.

The storage adjustment tank 12 is provided with a transport pipe 14 for a floating separation tank, which is formed in a spiral shape so as to be wound around the storage adjustment tank 12. The transport pipe 14 for the floating separation tank is formed in a spiral shape so as to be wound around the storage adjustment tank 12 and has a long transport distance. By using this long transport pipe, it is possible to ensure the reaction with chemicals (aggregators, pH adjusters, neutralizers, etc.) added to raw water (turbid water), and to speed up the subsequent separation process. Have. In the illustrated example, it has a triple spiral shape, but this is an example and is not limited to this number. It is also possible to form irregularities in the transport pipe and further enhance the reactivity between raw water (turbid water) or treated water and chemicals.

The spiral-shaped levitation separation tank transport pipe 14 is connected to the upstream side thereof via an on-off valve 5 and a pump 6 at a position below the storage adjustment tank 12 downstream. The transport pipe 14 for the levitation separation tank transports the charged raw water (turbid water) from the lower position to the upper position.

<Structure of floating separation tank>
The levitation separation tank 3 is a treatment device that separates raw water (turbid water) or treated water into scum and levitation treated water. The floating separation tank 3 has a scum discharge tank 17 having a scum discharge port 15 for discharging scum at the upper part and a settling treated water inlet 16 for charging settling treated water at the lower part, and a scum discharge tank 17 adjacent thereto and below the partition wall 18. It is composed of a floating treated water discharge tank 19 that communicates with the water. The levitation treated water discharge tank 19 is provided with a level-adjusted discharge cylinder 20 for discharging the levitation treated water at the center position in the vertical direction. The levitation treated water is overflowed and discharged from the levitation treated water discharge port 21 at the lower part of the level adjustment discharge cylinder 20. The length of the level adjustment discharge cylinder 20 can be adjusted in the vertical direction in order to adjust the water level in the floating treated water discharge tank 19.

The turbid water treatment device 1 of the present invention is not limited to an accurate cylindrical shape as shown in the plan view of FIG. It can be made into various shapes such as an elliptical shape (an oval shape) in a plan view and a polygonal shape.

<Treatment method using a turbid water treatment device>
When treating turbid water using the turbid water treatment apparatus 1 of the present invention, the sedimentation separation treatment can be performed first, and then the floating separation treatment can be performed. On the contrary, there are two types of methods, in which the floating separation treatment is performed first and then the sedimentation separation treatment is performed. The turbid water treatment device 1 of the present invention can change the order of sedimentation separation treatment and levitation separation treatment according to the properties of turbid water. As shown in "Relationship between the properties of turbid water and the order of treatment" in Table 1, for example, turbid water is inorganic turbid water, turbid water having many particles with a specific gravity of 1.0 t / m ³ or more, and few suspended matter. In the case of turbid water having good sedimentation property, the order of sedimentation separation treatment is preferable first, and then floating separation treatment is preferable. Processing can proceed smoothly in this order.

On the contrary, if the turbid water is organic turbid water, has many particles with a specific gravity of 1.0 t / m ³ or less, and has many suspended substances such as oil, or turbid water having good levitation properties, the turbid water is first floated and separated. Next, the order of sedimentation separation treatment is preferable. Processing can proceed smoothly in this order.

<Processing method of first performing sedimentation separation treatment and then floating separation treatment>
FIG. 3 is a flow chart showing a treatment method of performing sedimentation separation treatment using a turbid water treatment apparatus and then performing floating separation treatment. FIG. 4 is a vertical cross-sectional view of an apparatus showing a treatment method for performing sedimentation separation treatment and then floating separation treatment. The thick solid line in the figure represents the transportation and treatment of raw water (turbid water), and FIG. 4A shows sedimentation. The state during the separation treatment, (b) shows the state during the floating separation treatment, and (c) shows the state of discharging the treated water after the separation treatment.
As shown in FIG. 4A, a flocculant is added to the raw water (turbid water), and the raw water (turbid water) is charged into the sedimentation separation tank 2 from the center well portion 7. The pH of the raw water (turbid water) is adjusted, and at this time, the slurry is settled and separated while stirring using a water stream, and the slurry is discharged by the slurry scraper 11.
As a pretreatment, turbid water is treated as sedimented raw water by precipitating large lumps in a raw water tank. This raw water tank is not an essential treatment process.

The sedimentation treated water after separating and removing the slurry in the sedimentation separation tank 2 is temporarily stored in the storage adjustment tank 12. This is to adjust the processing amount with the floating separation tank 3 whose processing time is faster than that of the sedimentation separation tank 2.

Next, as shown in FIG. 4 (b), the sedimentation treated water treated in the sedimentation separation tank 2 is put into the levitation separation tank 3 by the spiral-shaped levitation separation tank transport pipe 14, and the levitation scum remains as it is. Discharge.

Finally, as shown in FIG. 4 (c), the levitation treated water treated in the levitation separation tank 3 overflows and discharges into the level adjustment discharge cylinder 20, and the river and the sea are discharged from the lower levitation treatment water discharge port 21. Discharge to public water areas such as.

<Processing method of first floating separation treatment and then sedimentation separation treatment>
FIG. 5 is a flow chart showing a treatment method in which a floating separation treatment is performed using a turbid water treatment device and then a sedimentation separation treatment is performed. FIG. 6 is a normal cross-sectional view of an apparatus showing a treatment method for levitation separation treatment and then sedimentation separation treatment. The thick solid line in the figure represents the transportation and treatment of raw water (turbid water), and FIG. 6A shows levitation. The state during the separation treatment, (b) shows the state during the sedimentation separation treatment, and (c) shows the state of discharging the treated water after the separation treatment.
When there are a lot of floating substances such as fats and oils and scum in the turbid water, the floating separation treatment is performed first and the turbid water treatment is performed quickly. After that, sedimentation separation treatment is performed.
First, as shown in FIG. 6A, a flocculant is added to raw water (turbid water) and charged into the floating separation tank 3 by a spiral-shaped floating separation tank transport pipe 14. The scum that floats in the scum discharge tank 17 of the floating separation tank 3 is discharged as it is. The levitation-treated water that has been levitation-separated is transported to the levitation-treated water discharge tank 19. The injection position of the raw water (turbid water) is different from that in FIG. 4A, but in FIG. 6A, this position is changed because the order of treatment is different.
Next, as shown in FIG. 6B, the levitation treated water separated in the levitation separation tank 3 overflows and discharges to the level adjustment discharge pipe 20 in the levitation treatment water discharge tank 19, and the lower levitation treatment water is discharged. A coagulant is further added from the discharge port 21 through the transport pipe 8 for the sedimentation separation tank and charged into the center well portion 7. The levitation treated water is put into the settling separation tank 2 from the center well portion 7 and separated into the settling slurry and the settling treated water. The slurry is discharged in the sedimentation separation tank 2.
Finally, as shown in FIG. 6C, the sedimentation-treated water after discharging the slurry in the sedimentation separation tank 2 is stored in the storage adjustment tank 12, and the sedimentation-treated water is publicly used from the sedimentation-treated water discharge port 13 as it is. Discharge to water area and complete treatment.

Also at this time, as a pretreatment, if necessary, the turbid water is treated in the raw water tank 9 into floating raw water in which large lumps are precipitated. Air and chemicals are mixed with the floating raw water, and the floating raw water is charged into the floating separation tank 3.

When the levitation separation treatment is performed in the levitation separation tank 3, bubbles are generated in the levitation separation tank 3, adsorbing pollutants in raw water (turbid water) at the gas-liquid interface of the bubbles, and concentrating and floating. It is also possible to discharge.

<Modification example using a separation screen instead of the floating separation tank>
FIG. 7 is a vertical cross-sectional view of an apparatus showing a modified example in which a separation screen is used instead of the levitation separation tank in the process of performing the sedimentation separation treatment and then the levitation separation treatment.
In the case of the treatment method in which the sedimentation separation treatment is performed and then the levitation separation treatment is performed, the levitation separation tank 3 does not necessarily have to be used. For example, the separation screen 31 can be used instead of the floating separation tank 3. The sedimentation treated water treated in the sedimentation separation tank 2 is put into the separation screen 31, the treated water is separated from the scum, and the falling treated water (separated water) is dropped and discharged. The scum that has slipped down on the screen of the separation screen 31 is also discharged.

<Structure of turbid water treatment device formed in multiple cylinders>
Although not shown, the turbid water treatment device of the second embodiment is a more compact structure of the treatment device. The turbid water treatment device of the second embodiment is a treatment device in which a cylindrical sedimentation separation tank 2 and a levitation separation tank for separating the sedimentation treatment water into scum and levitation treatment water are provided in a multiple cylinder shape.

In the turbid water treatment device of the second embodiment, a storage adjustment tank is provided in a multi-cylindrical shape on the outer periphery of the sedimentation separation tank having the configuration as described in the first embodiment. A floating separation tank that separates raw water (turbid water) or treated water into scum and floating treated water is further provided in a multi-cylindrical shape on the outer periphery of the storage adjustment tank. As a result, the sedimentation separation tank, the floating separation tank, and the storage adjustment tank are integrated into the turbid water treatment device to make it compact, and its transportation and handling become easy. The upper part of the floating separation tank has a scum discharge port for discharging scum, and the lower part has a settling treated water inlet for charging settling treated water. The turbid water treatment device of the second embodiment can also change the order of the sedimentation separation treatment and the floating separation treatment according to the properties of the turbid water.

The turbid water treatment device of the second embodiment has a configuration in which a settling treatment and a levitation treatment are combined in one device, and the multi-cylindrical shape is not limited to an accurate cylindrical shape in a plan view. It can be made into various shapes such as an elliptical shape (an oval shape) in a plan view and a polygonal shape.

In the present invention, by making a compact treatment apparatus having both sedimentation separation and floating separation, pretreatment of raw water becomes unnecessary, and it can be operated even in a narrow installation place, and depending on the properties of turbid water. As long as the configuration allows the separation process to be smoothly performed by changing the order of the sedimentation separation process and the levitation separation process, the configuration is not limited to the above-described embodiment of the invention, and various changes are made without departing from the gist of the present invention. Of course you can do it.

The turbid water treatment apparatus and the treatment method thereof of the present invention can be used not only for construction works such as tunnel construction but also for treating turbid water generated at factories, business establishments, construction sites and the like.

1 Muddy water treatment device 2 Sedimentation separation tank 3 Floating separation tank 4 Slurry discharge port 7 Center well 8 Transport pipe for sedimentation separation tank 12 Storage adjustment tank 13 Sedimentation treatment water drain port 14 Transport pipe for floating separation tank 15 Scum discharge port 16 Sedimentation Treated water inlet 17 Scum discharge tank 18 Partition 19 Floating treated water discharge tank 20 Level adjustment discharge cylinder 21 Floating treated water discharge port

The turbid water treatment apparatus of the present invention is a turbid water treatment apparatus (1) that has both sedimentation separation and floating separation for turbid water generated at construction work and construction sites , and can change the treatment order thereof .
A tubular settling separation tank (2) having a slurry discharge port (4) for discharging the slurry at the bottom and separating the object to be treated into the slurry and the settling treated water.
A tubular center well portion (7) for charging an object to be treated , which is attached to the inside of the sedimentation separation tank (2) from the upper part to the lower part,
Wherein provided in the double cylinder shape on the outer periphery of the settling tank (2), possess on-off valve (5) sedimentation treated water drain outlet connected to discharge sedimentation treated water to the bottom portion (13), said A storage adjustment tank (12) that temporarily stores the sedimentation treated water that has overflowed from the upper edge of the sedimentation separation tank (2) and has been separated and removed from the slurry by opening and closing the on-off valve (5) .
A scum discharge tank (17) having a scum discharge port (15) for discharging scum at the upper part and a settling treated water / raw water inlet (16) for charging the object to be treated at the lower part, and a partition wall (adjacent to the scum discharge tank (17)). The levitation treated water discharge tank (19) communicating below 18) and the levitation treated water discharge tank (19) are provided in the vertical direction so that the length can be adjusted in the vertical direction in order to adjust the water level. In addition, a floating separation tank (3) that separates the object to be treated into scum and floating treated water, which consists of a level-adjusted discharge cylinder (20) that overflows and discharges the floating treated water.
A transport pipe (8) for a sedimentation separation tank that transports the object to be treated to the center well portion (7), and
A transport pipe (14) for a floating separation tank, which is formed in a spiral shape so as to be wound around the storage adjustment tank (12) , for transporting an object to be treated to the floating separation tank (3), is provided.
When the raw water (turbid water) of the object to be treated is treated in the order of sedimentation separation to floating separation using the turbid water treatment device (1),
Raw water (turbid water) is charged into the center well portion (7) in the sedimentation separation tank (2).
The sedimentation treatment water that overflowed from the upper edge of the sedimentation separation tank (2) and after separating and removing the slurry is temporarily stored in the storage adjustment tank (12), and the sedimentation treatment is performed from the storage adjustment tank (12). Water is transported to the floating separation tank (3) using the floating separation tank transport pipe (14).
The sedimentation-treated water treated in the sedimentation separation tank (2) is separated into scum and levitation-treated water in the levitation separation tank (3) and discharged.
When the raw water (turbid water) of the object to be treated is treated in the order of floating separation to sedimentation separation using the turbid water treatment device (1),
Raw water (turbid water) is put into the levitation separation tank (3) using the levitation separation tank transport pipe (14) and separated into scum and levitation treated water.
The levitation treated water treated in the levitation separation tank (3) is put into the sedimentation separation tank (2) and separated into a slurry and a sedimentation treatment water.
The sedimentation treatment water that overflowed from the upper edge of the sedimentation separation tank (2) and after the slurry was separated and removed was temporarily stored in the storage adjustment tank (12) and settled from the storage adjustment tank (12). It is characterized in that it is configured to discharge treated water .

The turbid water treatment method of the present invention has a slurry discharge port (4) for discharging a slurry at the lower part of raw water ( turbid water ) generated at a construction work or a construction site, and a tubular center well portion attached to the inside downward. (7), a tubular settling separation tank (2) that separates raw water (turbid water) into slurry and settling treated water .
The sedimentation separation tank (2) has a double-cylinder-shaped sedimentation treatment water drain port (13) at the bottom thereof, and is provided from the upper edge of the sedimentation separation tank (2). and overflow, reservoir adjusting tank for storing the sedimentation treated water after the slurry has been separated off (12) and,
From a scum discharge tank (17) having a scum discharge port (15) for discharging scum at the upper part and a sedimentation treated water / raw water input port (16) for charging sedimentated treated water after separating and removing the slurry at the lower part. A levitation separation tank (3) that separates the sedimentation treatment water treated in the sedimentation separation tank (2) into scum and levitation treatment water is separated from sedimentation separation using a turbid water treatment device (1) provided. It is a turbid water treatment method that treats in the order of
First, a flocculant is added to the raw water (turbid water) and charged into the center well portion (7) in the sedimentation separation tank (2), and the raw water (turbid water) is poured from the center well portion (7) into the sedimentation separation tank (7). In (2), the settling slurry and the settling treated water are separated and separated.
Then, the precipitation treatment water after discharge of the slurry in the settling tank (2), transported to the reservoir adjusting tank (12),
Finally, the sedimentation treated water reservoir adjusting tank (12) after adjusting the temporary storage and processing amount to transport the sediment treated water into the flotation tank (3), scum floating the floating treated water The scum is discharged from the scum discharge port (15), and the levitation treated water is discharged from the levitation treated water discharge port (21) to a public water area to complete the treatment.

Further, turbid water treatment method of the present invention, construction, the raw water occurs at construction sites (turbid water), scum and the lower scum discharge port for discharging (15) the upper, sedimentation water-to inject raw water (turbid water) A scum is a raw water (turbid water) composed of a scum discharge tank (17) having a raw water inlet (16) and a floating treated water discharge tank (19) adjacent thereto and communicating below a partition wall (18). Floating separation tank (3) that separates into levitation treated water ,
The slurry outlet port for discharging the slurry into the bottom with a (4), said settling tank of the flotation tank (3) treated with cylindrical separating the floating treated water to the slurry and settling the treated water was (2) and,
The sedimentation treatment water drainage port (13) is provided on the outer periphery of the sedimentation separation tank (2) and is connected to an on-off valve (5) for discharging the sedimentation treatment water at the bottom. A turbid water treatment device (1) provided with a storage adjustment tank (12) for storing the sedimentation treated water after separating and removing the slurry, which overflowed from the upper edge of the sedimentation separation tank (2) , was used for floating separation. It is a turbid water treatment method that treats in the order of sedimentation and separation .
First, the raw water (turbid water) is put into the floating separation tank (3), separated into scum and levitation treated water, and the scum is discharged as it is.
Next, the levitation treated water is transported from the levitation separation tank (3) to the sedimentation separation tank transport pipe (8), and a flocculant is added thereto to the center well portion (7) of the sedimentation separation tank (2). It is charged and separated into sedimented slurry and sedimented treated water.
Finally, the sedimentation treatment water after discharging the slurry in the sedimentation separation tank (2) is temporarily stored in the storage adjustment tank (12) to adjust the treatment amount , and then the sedimentation treatment water is subjected to the sedimentation treatment as it is. It is characterized in that it is discharged from a water discharge port (13) to a public water area to complete the treatment.

When the levitation separation treatment is performed in the levitation separation tank (3), bubbles are generated in the levitation separation tank (3), and pollutants in raw water (turbid water) are adsorbed on the gas-liquid interface of the bubbles, and It can be concentrated, levitated and discharged.

Since the turbid water treatment method of the present invention has both sedimentation separation and floating separation, whichever comes first, it is possible to optimize the injection amount by utilizing the characteristics of each according to the properties of the raw water (turbid water). If necessary, the treated water can be subjected to floating separation or sedimentation separation treatment, wasteful use of chemicals can be avoided, and work costs can be reduced.
Since the treatment time of the floating separation tank (3) is faster than the treatment time of the sedimentation separation tank (2), the sedimentation treatment water treated in the sedimentation separation tank (2) is stored in the storage adjustment tank (12) to some extent. The amount of processing can be adjusted.

<Structure of floating separation tank>
The levitation separation tank 3 is a treatment device that separates raw water (turbid water) or treated water into scum and levitation treated water. The floating separation tank 3 has a scum discharge tank 17 having a scum discharge port 15 for discharging scum at the upper part and a settling treated water / raw water input port 16 for charging settling treated water at the lower part, and a partition wall 18 adjacent thereto. It is composed of a floating treated water discharge tank 19 that communicates with the lower part. The levitation treated water discharge tank 19 is provided with a level-adjusted discharge cylinder 20 for discharging the levitation treated water at the center position in the vertical direction. The levitation treated water is overflowed and discharged from the levitation treated water discharge port 21 at the lower part of the level adjustment discharge cylinder 20. The length of the level adjustment discharge cylinder 20 can be adjusted in the vertical direction in order to adjust the water level in the floating treated water discharge tank 19.

Also at this time, as a pretreatment, if necessary, the turbid water is treated in the raw water tank into the floating raw water in which large lumps are precipitated. Air and chemicals are mixed with the floating raw water, and the floating raw water is charged into the floating separation tank 3.

In the turbid water treatment device of the second embodiment, a storage adjustment tank is provided in a multi-cylindrical shape on the outer periphery of the sedimentation separation tank having the configuration as described in the first embodiment. A floating separation tank that separates raw water (turbid water) or treated water into scum and floating treated water is further provided in a multi-cylindrical shape on the outer periphery of the storage adjustment tank. As a result, the sedimentation separation tank, the floating separation tank, and the storage adjustment tank are integrated into the turbid water treatment device to make it compact, and its transportation and handling become easy. The upper part of the floating separation tank has a scum discharge port for discharging scum, and the lower part has a settling treated water / raw water input port for charging settling treated water. The turbid water treatment device of the second embodiment can also change the order of the sedimentation separation treatment and the floating separation treatment according to the properties of the turbid water.

1 Muddy water treatment device 2 Sedimentation separation tank 3 Floating separation tank 4 Slurry discharge port 7 Center well 8 Transport pipe for sedimentation separation tank 12 Storage adjustment tank 13 Sedimentation treatment water drainage port 14 Transport pipe for floating separation tank 15 Scum discharge port 16 Sedimentation Treated water / raw water inlet 17 Scum discharge tank 18 Partition 19 Floating treated water discharge tank 20 Level adjustment discharge pipe 21 Floating treated water discharge port

The turbid water treatment method of the present invention separates turbid water generated at construction work and construction sites from sedimentation separation to levitation separation using a turbid water treatment apparatus (1) that has both sedimentation separation and levitation separation and can change the treatment order . It is a muddy water treatment method that treats in order,
A tubular settling separation tank (2) having a slurry discharge port (4) for discharging the slurry at the bottom and separating the object to be treated into the slurry and the settling treated water.
A tubular center well portion (7) for charging an object to be treated, which is attached to the inside of the sedimentation separation tank (2) from the upper part to the lower part,
The sedimentation treatment water drainage port (13) is provided on the outer periphery of the sedimentation separation tank (2) and is connected to an on-off valve (5) for discharging the sedimentation treatment water at the bottom. A storage adjustment tank (12) that temporarily stores the sedimentation treated water that has overflowed from the upper edge of the sedimentation separation tank (2) and has been separated and removed from the slurry by opening and closing the on-off valve (5).
A scum discharge tank (17) having a scum discharge port (15) for discharging scum at the upper part and a settling treated water / raw water inlet (16) for charging the object to be treated at the lower part, and a partition wall (adjacent to the scum discharge tank (17)). The levitation treated water discharge tank (19) communicating below 18) and the levitation treated water discharge tank (19) are provided in the vertical direction so that the length can be adjusted in the vertical direction in order to adjust the water level. In addition, a floating separation tank (3) that separates the object to be treated into scum and floating treated water, which consists of a level-adjusted discharge cylinder (20) that overflows and discharges the floating treated water.
A transport pipe (8) for a sedimentation separation tank that transports the object to be treated to the center well portion (7), and
Muddy water treatment including a transport pipe (14) for a floating separation tank formed in a spiral shape so as to be wound around the storage adjustment tank (12) for transporting the object to be treated to the floating separation tank (3). Using the device (1)
First, a flocculant is added to the raw water (turbid water) and charged into the center well portion (7) in the sedimentation separation tank (2), and the raw water (turbid water) is poured from the center well portion (7) into the sedimentation separation tank (7). In (2), the settling slurry and the settling treated water are separated and separated.
Next, the sedimentation treated water after discharging the slurry in the sedimentation separation tank (2) is transported to the storage adjustment tank (12).
Finally, the sedimentation treated water is temporarily stored in the storage adjustment tank (12) to adjust the treatment amount, and then the sedimentation treatment water is transported to the floating separation tank (3) to float the scum and the floating treatment water. The scum is discharged from the scum discharge port (15), and the levitation treated water is discharged from the levitation treated water discharge port (21) to a public water area to complete the treatment.

In addition, the turbid water treatment method of the present invention uses a turbid water treatment device (1) that has both sedimentation separation and levitation separation and can change the treatment order for turbid water generated at construction work and construction sites, and then sediments from levitation separation. It is a turbid water treatment method that treats in the order of separation.
A tubular settling separation tank (2) having a slurry discharge port (4) for discharging the slurry at the bottom and separating the object to be treated into the slurry and the settling treated water.
A tubular center well portion (7) for charging an object to be treated, which is attached to the inside of the sedimentation separation tank (2) from the upper part to the lower part,
The sedimentation treatment water drainage port (13) is provided on the outer periphery of the sedimentation separation tank (2) and is connected to an on-off valve (5) for discharging the sedimentation treatment water at the bottom. A storage adjustment tank (12) that temporarily stores the sedimentation treated water that has overflowed from the upper edge of the sedimentation separation tank (2) and has been separated and removed from the slurry by opening and closing the on-off valve (5).
A scum discharge tank (17) having a scum discharge port (15) for discharging scum at the upper part and a settling treated water / raw water inlet (16) for charging the object to be treated at the lower part, and a partition wall (adjacent to the scum discharge tank (17)). The levitation treated water discharge tank (19) communicating below 18) and the levitation treated water discharge tank (19) are provided in the vertical direction so that the length can be adjusted in the vertical direction in order to adjust the water level. In addition, a floating separation tank (3) that separates the object to be treated into scum and floating treated water, which consists of a level-adjusted discharge cylinder (20) that overflows and discharges the floating treated water.
A transport pipe (8) for a sedimentation separation tank that transports the object to be treated to the center well portion (7), and
Muddy water treatment including a transport pipe (14) for a floating separation tank formed in a spiral shape so as to be wound around the storage adjustment tank (12) for transporting the object to be treated to the floating separation tank (3). Using the device (1)
First, the raw water (turbid water) is put into the floating separation tank (3), separated into scum and levitation treated water, and the scum is discharged as it is.
Next, the levitation treated water is transported from the levitation separation tank (3) to the sedimentation separation tank transport pipe (8), and a flocculant is added thereto to the center well portion (7) of the sedimentation separation tank (2). It is charged and separated into sedimented slurry and sedimented treated water.
Finally, the sedimentation treatment water after discharging the slurry in the sedimentation separation tank (2) is temporarily stored in the storage adjustment tank (12) to adjust the treatment amount, and then the sedimentation treatment water is subjected to the sedimentation treatment as it is. It is characterized in that it is discharged from a water discharge port (13) to a public water area to complete the treatment.

Claims (6)

It is a multi-cylindrical turbid water treatment device (1) that processes sedimentation separation and levitation separation in order for turbid water generated at construction works and construction sites.
A tubular sedimentation separation tank (2) having a slurry discharge port (4) at the bottom for separating raw water (turbid water) into slurry and sedimentation treated water.
A tubular center well portion (7) for pouring raw water to which a coagulant is added, which is attached to the inside of the sedimentation separation tank (2) from the upper part to the lower part.
Overflow from the upper edge of the sedimentation separation tank (2), which is provided on the outer periphery of the sedimentation separation tank (2) in a multi-cylindrical shape and has a sedimentation treatment water drain port (13) at the bottom for discharging the sedimentation treatment water. A storage adjustment tank (12) that temporarily stores the treated water after sedimentation and separation,
A scum discharge tank (17) having a scum discharge port (15) for discharging scum at the upper part and a settling treated water inlet (16) for charging settling treated water at the lower part, and a partition wall (18) adjacent thereto. A levitation separation tank (3) that separates raw water (turbid water) or treated water into scum and levitation treated water, which is composed of a levitation treated water discharge tank (19) that communicates below.
A transport pipe (8) for a sedimentation separation tank that transports raw water (turbid water) or treated water to the center well portion (7), and
A turbid water treatment apparatus including a transport pipe (14) for a floating separation tank that transports sedimentation treated water from the storage adjustment tank (12) to the floating separation tank (3). The turbid water treatment apparatus according to claim 1, wherein the transport pipe (14) for a floating separation tank is formed in a spiral shape so as to be wound around the storage adjustment tank (12). The turbid water treatment apparatus according to claim 1 or 2, wherein a level-adjusted discharge cylinder (20) for overflowing and discharging the levitation treated water is provided in the levitation treated water discharge tank (19) in the vertical direction. Sediment separation and levitation separation of turbid water generated at construction works and construction sites using a turbid water treatment device (1) provided with a storage adjustment tank (12) and a levitation separation tank (3) outside the sedimentation separation tank (2). This is a turbid water treatment method using a multi-cylindrical turbid water treatment device that sequentially treats
First, a flocculant is added to raw water (turbid water) and charged into the center well portion (7) in the sedimentation separation tank (2).
Raw water (turbid water) is separated from the center well portion (7) into sedimented slurry and sedimented treated water in the sedimentation separation tank (2).
Next, the sedimentation treated water after discharging the slurry in the sedimentation separation tank (2) is transported to the storage adjustment tank (12).
Finally, after temporarily storing in the storage adjustment tank (12) to adjust the treatment amount, the sedimentation treated water is transported to the floating separation tank (3) and separated into floating scum and floating treated water. , The scum is discharged from the scum discharge port (15), and the levitation treated water is discharged from the levitation treated water discharge port (21) to the public water area to complete the treatment. Muddy water treatment using a turbid water treatment device. Method. Sediment separation and levitation separation of turbid water generated at construction works and construction sites using a turbid water treatment device (1) provided with a storage adjustment tank (12) and a levitation separation tank (3) outside the sedimentation separation tank (2). This is a turbid water treatment method using a multi-cylindrical turbid water treatment device that sequentially treats
First, a flocculant is added to the raw water (turbid water) and put into the floating separation tank (3), where the scum and the floating treated water are separated, and the scum is discharged as it is.
Next, the levitation treated water is poured from the levitation separation tank (3) into the center well portion (7) of the sedimentation separation tank (2) through the transport pipe (8) for the sedimentation separation tank, and the slurry and the sedimentation treatment water are settled. Separated into
The sedimentation treated water after discharging the slurry in the sedimentation separation tank (2) is temporarily stored in the storage adjustment tank (12), and the sedimentation treatment water is discharged as it is from the sedimentation treatment water discharge port (13) to the public water area. A turbid water treatment method using a turbid water treatment device, which comprises completing the treatment. When the levitation separation treatment is performed in the levitation separation tank (3), bubbles are generated in the levitation separation tank (3), and pollutants in raw water (turbid water) are adsorbed on the gas-liquid interface of the bubbles, and The method for treating turbid water using the turbid water treatment apparatus according to claim 4 or 5, wherein the substance is concentrated, floated, and discharged.

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