Turbid water treatment equipment

Abstract

To provide turbid water treatment equipment that can treat turbid water efficiently and enables a space to be saved.SOLUTION: A turbid water treatment equipment 1 is provided, comprising a settling tank 2, a slurry receiving tank 3 provided in the settling tank 2, and a water pipe 5 through which water to be treated is supplied to the slurry receiving tank 3. A treated water discharge port 21 through which treated water is discharged is formed at an upper part of the settling tank 2, and a slurry discharge port 22 is formed at a lower portion of the settling tank 2. An upper surface of the slurry receiving tank 3 is opened and an upper end thereof is lower than the treated water discharge port 21, and a lower end thereof is arranged with an interval above the slurry discharge port 22. Through the water pipe 5 water to be treated is supplied to a bottom portion of the slurry receiving tank 3.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a turbid water treatment device. [Background technology]

[0002] During the construction of tunnels and underground structures, turbid water may be generated due to groundwater or other springs. Turbid water generated during construction generally contains impurities such as sediment, so it is necessary to remove the impurities through turbid water treatment. One method of treating turbid water is to mix a coagulant with the turbid water (raw water), then use a coagulation and sedimentation device to settle and remove flocs containing impurities, and then discharge the separated water (treated water).

[0003] For example, Patent Document 1 discloses a turbid water treatment method in which water to be treated mixed with a flocculant is stored in a separation tank and only separated water (treated water) from which flocs have been removed is discharged. The separation tank in Patent Document 1 is provided with a first partition wall with an opening at the bottom and a second partition wall with an opening at the top, and the water to be treated passes below the first partition wall and above the second partition wall, thereby separating the flocs.

[0004] Furthermore, Patent Document 2 discloses a turbid water treatment device that includes a coagulation reaction tank in which a coagulant is added to raw water to generate flocs, and a settling tank in which the flocs are separated and precipitated from the turbid water. The turbid water treatment device of Patent Document 2 is configured to have an agitator installed in the coagulation reaction tank to promote the generation of flocs. In the settling tank, the flocs in the turbid water sent from the coagulation reaction tank are separated and precipitated, and then the supernatant water (treated water) is discharged. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-150776 [Patent Document 2] Japanese Patent Application Laid-Open No. 2012-050947 Summary of the Invention [Problem to be solved by the invention]

[0006] In the turbid water treatment method of Patent Document 1, the separation tank divided into multiple sections by partitions becomes large, and there are cases where it is not possible to secure the installation space for the separation tank. Furthermore, the turbid water treatment device in Patent Document 2 uses gravity to settle the flocs, so it takes time to separate the flocs. Therefore, the treatment capacity may be insufficient at sites with large amounts of turbid water. On the other hand, if the turbid water treatment device is made larger in accordance with the amount of turbid water, there is a risk that installation space will not be available.

[0007] From this perspective, an object of the present invention is to propose a turbid water treatment device that enables efficient turbid water treatment and also saves space. [Means for solving the problem]

[0008] In order to solve the above problems, the present invention provides a turbid water treatment system including a settling tank, a slurry receiving tank provided in the settling tank, and a water supply pipe for supplying water to be treated to the slurry receiving tank. an umbrella material for covering the opening of the slurry receiving tank; The settling tank has an upper portion formed with a treated water outlet for discharging treated water, and a lower portion formed with a slurry outlet. The slurry receiving tank has an open top, an upper end lower than the treated water outlet, and a lower end disposed above the slurry outlet with a gap. The water supply pipe supplies the water to be treated to the bottom of the slurry receiving tank. The umbrella material has a shape larger than the opening of the slurry receiving tank, is lower than the treated water outlet, and is located at a height that leaves a gap between it and the upper end of the slurry receiving tank.

[0009] In this turbid water treatment device, the water to be treated, in which a flocculant has been mixed into turbid water, is supplied to a slurry receiving tank, causing the slurry to accumulate at the bottom of the slurry receiving tank. The water to be treated supplied to the bottom of the slurry receiving tank where the slurry accumulates passes through the gaps in the slurry, separating it into slurry and treated water. The slurry (flocs) that accumulate in the slurry receiving tank falls over the upper edge of the slurry receiving tank to the bottom of the settling tank. In other words, the turbid water treatment device promotes separation of treated water and flocs in the slurry receiving tank, enabling efficient turbid water treatment. Furthermore, if turbid water treatment proceeds efficiently (if the treatment speed is increased), a predetermined amount of water can be treated even if the turbid water treatment device (settling tank) is made smaller, which ultimately enables the device to take up less space.

[0010] before The opening of the slurry receiving tank is covered. stomach The slurry receiving tank has a shape larger than the opening of the slurry receiving tank, is lower than the treated water discharge outlet, and is installed at a height position with a gap between it and the upper end of the slurry receiving tank. Because it has umbrella material Even if flocs rise due to the upward flow formed by the supply of water to be treated, the umbrella material guides them downward (to the bottom of the settling tank), preventing them from being discharged from the treated water outlet together with the treated water.

[0011] Furthermore, if a turbulence generating means is provided inside the water supply pipe, mixing of the turbid water with the coagulant is promoted, so that the turbid water treatment proceeds more efficiently. Furthermore, if the system further includes a stirring means for supplying a mixed water obtained by mixing turbid water, a polymer flocculant, and an inorganic flocculant to the water supply pipe as the water to be treated, floc formation is further promoted. Note that it is desirable that the stirring means be provided with a rapid stirring means and a slow stirring means disposed downstream of the rapid stirring means in the water supply direction (on the water supply pipe side). Furthermore, if the muddy water treatment device is fixed to a stand that can be mounted on the bed of a 4-ton truck, the muddy water treatment device can be easily moved and installed. [Effects of the Invention]

[0012] According to the turbid water treatment device of the present invention, it is possible to achieve efficient turbid water treatment and space saving for the device. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a cross-sectional view showing a turbid water treatment device according to an embodiment of the present invention. [Figure 2] FIG. 2 is a plan view of the muddy water treatment device. [Figure 3] FIG. 2 is a plan view showing a rapid stirring means. [Figure 4] FIG. 2 is a plan view showing a slow stirring means. [Figure 5] 10A and 10B are diagrams showing a part of a turbid water treatment device according to another embodiment, in which (a) is a cross-sectional view and (b) is a cross-sectional view taken along the line AA in (a). DETAILED DESCRIPTION OF THE INVENTION

[0014] In this embodiment, we will explain a turbid water treatment device 1 that removes impurities from turbid water (water to be treated) generated during construction work and discharges it as treated water. As shown in Figure 1, the turbid water treatment device 1 of this embodiment includes a settling tank 2, a slurry receiving tank 3, an umbrella member 4, a water supply pipe 5, and an agitation means 6. The turbid water treatment device 1 is fixed to a frame 7. The frame 7 of this embodiment is formed by combining steel materials and has a shape that allows it to be mounted on the bed of a 4-ton truck.

[0015] The settling tank 2 separates impurities (slurry) from the water to be treated and discharges the supernatant water, or treated water. The settling tank 2 is supported by support legs 24 erected on a frame 7. A treated water outlet 21 for discharging the treated water is formed at the top of the settling tank 2. A slurry outlet 22 is also formed at the center of the bottom end of the settling tank 2. As shown in FIGS. 1 and 2, the settling tank 2 of this embodiment is cylindrical, with the bottom having an inverted cone shape that narrows in diameter as it goes downward. Therefore, the slurry that settles in the settling tank 2 is guided along the bottom to the slurry outlet 22 in the center.

[0016] A sludge discharge pipe 23 is connected to the slurry discharge port 22. The slurry that has settled at the bottom of the settling tank 2 is discharged from the slurry discharge port 22 and removed via the sludge discharge pipe 23. A sand pump 25 is connected to the sludge discharge pipe 23. In other words, the turbid water treatment device 1 is provided with a means for suctioning and removing the slurry in the sludge discharge pipe 23. There is no limitation on the method of supporting the settling tank 2. There is also no limitation on the shape of the settling tank 2, and it may be, for example, rectangular in plan view.

[0017] As shown in FIGS. 1 and 2 , the slurry receiving tank 3 is provided in the settling tank 2. The slurry receiving tank 3 is disposed in the center of the settling tank 2, with a gap between the outer surface of the slurry receiving tank 3 and the inner surface of the settling tank 2. The upper end of the slurry receiving tank 3 is lower than the treated water discharge outlet 21, and the lower end of the slurry receiving tank 3 is disposed above the slurry discharge outlet 22 with a gap therebetween. The slurry receiving tank 3 has a truncated cone shape with an inner diameter larger at the upper end than at the lower end, and its upper surface (opening 31) is open while its lower surface is closed. The slurry receiving tank 3 of this embodiment is disposed at a predetermined height by a plurality of support legs 32 erected from the bottom of the settling tank 2. The method of supporting the slurry receiving tank 3 is not limited. For example, the slurry receiving tank 3 may be supported by a support member extending from the side wall of the settling tank 2, or it may be suspended from above. An umbrella member 4 is disposed above the slurry receiving tank 3 with a gap therebetween, and a water pipe 5 is inserted into the slurry receiving tank 3 from above.

[0018] As shown in Figures 1 and 2, the umbrella material 4 covers the opening (upper end) 31 of the slurry receiving tank 3. The umbrella material 4 has a planar shape larger than the planar shape of the opening 31 of the slurry receiving tank 3, and is shaped so that the slurry receiving tank 3 is hidden by the umbrella material 4 in a planar view. A cylindrical diffusion prevention material 41 extending downward is formed on the periphery of the umbrella material 4. The umbrella material 4 of this embodiment is fixed to the water supply pipe 5 and is provided at a height position lower than the treated water discharge outlet 21 and with a gap between it and the upper end of the slurry receiving tank 3. An insertion hole 43 is formed in the center of the umbrella material 4 for inserting the water supply pipe 5.

[0019] The water pipe 5 supplies the water to be treated to the slurry receiving tank 3. The water pipe 5 passes through the insertion hole 43 of the umbrella member 4, and the tip (lower end) of the water pipe 5 is located at the bottom of the slurry receiving tank 3. A turbulence generating means (not shown) is provided inside the water pipe 5. The turbulence generating means in this embodiment is a spiral blade that generates turbulence in the liquid flowing through the water pipe 5. The configuration of the turbulence generating means is not limited as long as it is capable of generating turbulence in the turbid water flowing through the water pipe 5. The water pipe 5 is connected to the agitation means 6 and transports the water to be treated supplied from the agitation means 6 to the slurry receiving tank 3. A plurality of slits 51 are formed on the side of the tip of the water pipe 5. The water to be treated supplied to the water pipe 5 is discharged into the slurry receiving tank 3 through the slits 51. Furthermore, the water pipe 5 in this embodiment has an open tip so that the water to be treated can also be discharged from the tip of the water pipe 5.

[0020] The agitation means 6 mixes turbid water, a polymer flocculant, and an inorganic flocculant, and supplies the mixed water (water to be treated) to the water supply pipe 5. As shown in FIG. 1, the agitation means 6 includes a rapid agitation means 61 and a slow agitation means 62 disposed downstream of the rapid agitation means 61 in the water supply direction (on the water supply pipe 5 side). As shown in FIGS. 1 and 2, the agitation means 6 of this embodiment is cylindrical and installed upright on the side of the settling tank 2. The rapid agitation means 61 is a plate member disposed at a distance above the bottom of the agitation means 6 to shield the agitation means 6. As shown in FIG. 3(a), a first through-hole 64 is formed in the center. The slow agitation means 62 is a plate member disposed at a distance above the rapid agitation means 61 to shield the agitation means 6. As shown in FIG. 3(b), a plurality of second through-holes 65 are formed. The second through-holes 65 have a smaller inner diameter than the first through-holes 64. 1, an inlet 63 for supplying turbid water is formed at the bottom of the agitation means 6. In addition, a flocculant injection port 66 for supplying a polymer flocculant, an inorganic flocculant, or the like is formed at the side wall of the agitation means 6.

[0021] In this embodiment, a raw water storage tank 8 for storing turbid water is provided adjacent to the agitation means 6. A transport pipe 81 leading to the inlet 63 of the agitation means 6 is connected to the raw water storage tank 8.

[0022] The turbid water treatment device 1 treats turbid water as follows. Turbid water (raw water) generated by construction work is stored in a raw water storage tank 8. The turbid water W0 stored in the raw water storage tank 8 is supplied to the agitation means 6 via a transport pipe 81. The amount of turbid water W0 supplied from the raw water storage tank 8 to the agitation means 6 may be determined appropriately depending on the progress of turbid water treatment by the turbid water treatment device 1.

[0023] The turbid water W0 supplied to the stirring means 6 is mixed with the polymer flocculant and inorganic flocculant supplied to the stirring means 6 as it flows from the bottom to the top of the stirring means 6. The stirring means 6 is provided with a rapid stirring means 61 and a slow stirring means 62, and the turbid water W0, polymer flocculant, and inorganic flocculant pass through the rapid stirring means 61 and the slow stirring means 62, thereby promoting mixing.

[0024] The turbid water W0 and the mixed water W1 of polymer coagulant and inorganic coagulant introduced to the upper part of the agitation means 6 are supplied as the water to be treated to the settling tank 2 via the water supply pipe 5. A turbulence generating means is provided inside the water supply pipe 5, and the formation of flocs F is promoted by the mixed water W1 passing through the water supply pipe 5.

[0025] The tip of the water supply pipe 5 is disposed at the bottom of the slurry receiving tank 3, and therefore the mixed water W1 is supplied into the slurry receiving tank 3. Flocs F (slurry) produced by the action of the polymer flocculant and the inorganic flocculant remain at the bottom of the slurry receiving tank 3. The flocs F contained in the mixed water W1 adhere to the flocs F remaining in the slurry receiving tank 3, and are separated from the mixed water W1. The treated water W2 from which the flocs F have been separated flows upward in the settling tank 2, and the flocs F separated from the mixed water W1 remain at the bottom of the slurry receiving tank 3.

[0026] In the slurry receiving tank 3, an upward flow is formed by supplying mixed water W1 to the bottom, but the umbrella material 4 provided above the slurry receiving tank 3 prevents the flocs F from rising. Flocs F that overflow from the upper edge of the slurry receiving tank 3 are prevented from diffusing by the diffusion prevention material 41 of the umbrella material 4, and so settle to the bottom of the settling tank 2. Therefore, supernatant water (treated water W2), in which flocs F have been separated from the mixed water W1, is guided to the top of the settling tank 2, and the treated water is discharged from the treated water discharge outlet 21. The flocs F (slurry) that have settled to the bottom of the settling tank 2 are discharged from the slurry discharge outlet 22.

[0027] According to the turbid water treatment device 1 of this embodiment, mixed water W1, in which a flocculant is mixed into turbid water W0, is supplied to the slurry receiving tank 3, causing the slurry to accumulate at the bottom of the slurry receiving tank 3. The mixed water W1 supplied to the bottom of the slurry receiving tank 3 where the slurry (flocs F) accumulates passes through the gaps in the slurry, and is separated into the slurry and treated water W2. Therefore, in the settling tank 2, the treated water W2 flows upward and is discharged from the treated water discharge outlet 21.

[0028] Furthermore, the slurry (flocs F) accumulated in the slurry receiving tank 3 falls over the upper edge of the slurry receiving tank 3 to the bottom of the settling tank 2. At this time, the umbrella material 4 disposed above the slurry receiving tank 3 prevents the slurry from floating up above the settling tank 2. In this way, the turbid water treatment device 1 promotes separation of the treated water W2 and the flocs F in the slurry receiving tank 3, enabling efficient turbid water treatment. Furthermore, if turbid water treatment progresses efficiently (if the treatment speed increases), it becomes possible to treat a predetermined amount of water even if the turbid water treatment device 1 (settling tank 2) is made smaller, which in turn enables space savings for the device.

[0029] In addition, since a turbulence generating means is provided inside the water pipe 5, floc formation is promoted in the mixed water W1 (water to be treated) in which the turbid water W0 is mixed with the coagulant, and the turbid water treatment proceeds more efficiently. Furthermore, the rapid stirring means 61 and slow stirring means 62 inside the stirring means 6 promote stirring of the turbid water W0, the polymer flocculant, and the inorganic flocculant. Furthermore, since the muddy water treatment device 1 is fixed to a platform 11 that can be mounted on the bed of a 4-ton truck, it can be easily moved and installed at a desired location, and can also be easily transported to other sites.

[0030] Although the embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and each of the above-described components can be appropriately modified within the scope of the gist of the present invention. In the above embodiment, the umbrella material 4 is provided above the slurry receiving tank 3, but the umbrella material 4 may be provided as needed, and the umbrella material 4 may be omitted if there is a sufficient difference in height between the opening of the slurry receiving tank 3 and the treated water discharge outlet 21 and there is no risk of flocs F flowing out from the treated water discharge outlet 21. Furthermore, the shape of the umbrella material 4 and the material constituting the umbrella material 4 are not limited.

[0031] The turbulent flow generating means for the water pipe 5 may be provided as needed. In addition, in the above embodiment, the water supply pipe 5 is piped from above the settling tank 2 to the bottom of the slurry receiving tank 3, but the arrangement of the water supply pipe 5 is not limited thereto, and for example, the water supply pipe 5 may be piped so as to connect to the slurry receiving tank 3 from the side.

[0032] In the above embodiment, the case where the slit 51 is formed at the tip of the water supply pipe 5 has been described, but the slit 51 may be formed as needed. Furthermore, when the slit 51 is formed at the water supply pipe 5, the tip of the water supply pipe 5 may be shielded. On the other hand, when the slit 51 is not formed at the tip of the water supply pipe 5, a drain opening is provided at the tip or side of the water supply pipe 5. 5(a) and 5(b), fins 52 may be provided on the side surface of the water supply pipe 5 so that the mixed water W1 supplied through the water supply pipe 5 forms a spiral flow in the slurry receiving tank 3. This allows the slurry receiving tank 3 to have an agitation function. The fins 52 preferably have an arc-shaped cross section and are disposed along the edge of the slits 51. In this manner, the mixed water W2 flowing outward in the radial direction of the water supply pipe 5 from the slits 51 flows along the fins 52, making it easier to form a spiral flow centered on the water supply pipe 5.

[0033] The bottom of the slurry receiving tank 3 may be configured to be openable and closable so that flocs F accumulated at the bottom can be discharged. When the tip of the water supply pipe 5 is closed, an opening 33 may be provided in the bottom of the slurry receiving tank 3 as shown in Figure 5(a) so that the flocs F can be discharged from the bottom. The bottom of the settling tank 2 may also have a window for cleaning the flocs F. [Explanation of symbols]

[0034] 1. Turbid water treatment equipment 2 Settling tank 21 Treated water outlet 22 Slurry outlet 3 Slurry receiving tank 4 Umbrella material 5 Water pipe 6 Stirring means 7 Mounting stand

Claims

1. a settling tank; a slurry receiving tank provided in the settling tank; a water supply pipe for supplying the water to be treated to the slurry receiving tank; A turbid water treatment device comprising: an umbrella material covering the opening of the slurry receiving tank; A treated water outlet for discharging treated water is formed at the top of the settling tank, A slurry discharge port is formed at the bottom of the settling tank, the slurry receiving tank has an open top, an upper end lower than the treated water discharge outlet, and a lower end disposed above the slurry discharge outlet with a gap therebetween; The water supply pipe supplies the water to be treated to the bottom of the slurry receiving tank, A turbid water treatment device characterized in that the umbrella material has a shape larger than the opening of the slurry receiving tank, is lower than the treated water discharge outlet, and is located at a height position with a gap between it and the upper end of the slurry receiving tank.

2. 2. The apparatus for treating muddy water according to claim 1, wherein a turbulent flow generating means is provided inside the water supply pipe.

3. The system further includes an agitation means for supplying mixed water obtained by mixing turbid water, a polymer flocculant, and an inorganic flocculant to the water supply pipe as the water to be treated, 2. The turbid water treatment device according to claim 1, wherein the agitation means includes a rapid agitation means and a slow agitation means disposed downstream of the rapid agitation means in the water conveying direction.

4. 2. The muddy water treatment device according to claim 1, wherein the device is fixed to a platform that can be mounted on the bed of a 4-ton truck.

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