JP7364189B2 - Solid-liquid separation system - Google Patents

Description

The present invention relates to solid-liquid separation systems.

Sedimentation tanks designed for conventional water treatment use multiple inclined plates to increase the settling area, and these inclined plates reduce flocs (agglomerates in which fine particles come together to form larger aggregates). A system had been developed to purify the sediment and water.

These technologies have been applied to sewage treatment, but in recent years, sewage treatment plants have been required to upgrade existing facilities from the perspective of reducing environmental impact, and as a result, final settling tanks have become more sophisticated. One example is that there is a need to increase the capacity of (see Patent Document 1).

According to "Sewage Facility Planning/Design Guidelines and Explanations - 2009 Edition" (Japan Sewage Works Association), the treatment capacity of the final settling tank is determined by the amount of inflow water per day (water area load) relative to the settling area of sludge. It will be done. The settling area of sludge is the area of the part that ultimately captures the sludge, and corresponds to the area of the bottom of the final settling tank where the settled sludge ends up, and usually corresponds to the area of the final settling tank itself.

Therefore, if a larger final sedimentation tank is installed, the impact on the quality of the treated water will be reduced even if the amount of inflow increases due to hourly or daily fluctuations. Usually, facilities are designed for the maximum daily water flow, so if facilities are designed for the peak water flow due to inflow fluctuations, there is a problem that excessive capital investment will be required. Therefore, in order to improve the efficiency of existing final sedimentation tanks, a technology using inclined plates has been proposed that improves processing capacity with a small capital investment.

Patent No. 6182190 specification

In the conventional configuration disclosed in the above-mentioned patent document, the flow velocity is slower in the rear stage part of the inclined plate apparatus than in the front stage part, so that water flowing into the apparatus tends to concentrate in the front stage part. Therefore, by adjusting the length of the sloped plate in the rear stage to be shorter or adjusting the arrangement of the sloped plates so that the pitch at the rear stage is wider, flow resistance can be reduced and the flow rate distributed evenly throughout the device. It shows how to do this.

However, in either method, the effective settling area of the inclined plate decreases, resulting in a decrease in the processing capacity of the inclined plate apparatus.

An object of the present invention is to provide a solid-liquid separation system that can suppress unevenness in flow rates among a plurality of inclined plates without reducing the effective settling area.

In order to achieve the above object, a solid-liquid separation system according to a first aspect of the present invention includes a settling tank, an inclined plate device, and a plate member. The inclined plate device is disposed within the sedimentation tank and has a plurality of inclined plates. The plate-like member is arranged so as to partially overlap the plurality of inclined plates in a plan view.

Since the plate-like members arranged in this way serve as resistance to water flow, water is difficult to flow between the inclined plates arranged above the plate-like members. For this reason, for example, by arranging a plate member at the front stage of the inclined plate device where inflow water is concentrated, it becomes difficult for water to flow into the front stage, and the flow rate flowing into the rear stage can be increased.

That is, by appropriately arranging the plate-like member below the inclined plate where inflow water tends to be larger than others, the flow rate can be distributed more evenly and unevenness in the flow rate can be suppressed.
In addition, there is no need to widen the interval between the inclined plates in the rear stage, and there is no need to shorten the length of the inclined plates, so there is no need to reduce the effective settling area, and a decrease in processing capacity can be prevented. .
In this way, it is possible to suppress uneven flow rates among the plurality of inclined plates without reducing the effective settling area.

The solid-liquid separation system according to the second invention is the solid-liquid separation system according to the first invention, further comprising an inflow section, an outflow section, and a baffle plate. In the inflow section, water to be treated flows into the settling tank. In the outflow section, treated water flows out from the settling pond. The baffle plate is arranged on the inlet side of the inclined plate device. The plate member is arranged on the outflow side of the baffle plate. The plate member faces at least a portion of the distance between the inclined plate and the baffle plate, which are disposed closest to the baffle plate.

Thereby, it is possible to suppress a short-circuit flow that does not flow between the inclined plates, but passes between the baffle plate and the inclined plate device, passes above the inclined plate device, and heads toward the outflow portion.

The solid-liquid separation system according to the third invention is the solid-liquid separation system according to the first invention, in which the plate-like member has an opening.

This allows water to pass through the opening and provides resistance to water flow. Therefore, it is possible to suppress the occurrence of unevenness in the flow rate on the inclined plate on the inlet side.

The solid-liquid separation system according to the fourth invention is the solid-liquid separation system according to the third invention, in which the opening is relative to the area of the plate-like member assuming that no opening is formed. It has an area of 5 to 90%.
This makes it possible to provide appropriate resistance to water flow.

A solid-liquid separation system according to a fifth invention is the solid-liquid separation system according to any one of the first to fourth inventions, wherein the plate-like member has a distance between the lower end of the inclined plate and the lower end of the inclined plate. It is connected to the tilt plate device so as to be adjustable between 1000 mm.

Thereby, the plate member can be adjusted to an appropriate position.

According to the present invention, it is possible to provide a solid-liquid separation system that can suppress uneven flow rates among a plurality of inclined plates without reducing the effective settling area.

1 is a side view showing a solid-liquid separation system according to an embodiment of the present invention. FIG. 2 is a perspective view schematically showing the configuration of the inclined plate device of the solid-liquid separation system of FIG. 1. FIG. FIG. 3 is a side view schematically showing the inclined plate device of FIG. 2; FIG. 3 is a front view of the arrangement of the inclined plate device of FIG. 2 as seen along the direction of arrow D. FIG. 2 is a plan view showing the positional relationship between the sewage slope plate and the short-circuit flow prevention plate in FIG. 1; (a) A plan view showing the second surface side of the sewage slope plate in FIG. 3, and (b) a plan view showing the first surface side of the sewage slope plate in FIG. 3. (a), (b) Plan views showing other examples of the short-circuit flow prevention plate shown in FIG. 3. (a), (b) Plan views showing other examples of the short-circuit flow prevention plate shown in FIG. 3. (a), (b) Plan views showing other examples of the short-circuit flow prevention plate shown in FIG. 3. (a), (b) Plan views showing other examples of the short-circuit flow prevention plate shown in FIG. 3. (a) A side view showing the mounting member of FIG. 3, and (b) a front view of the mounting member of FIG. 3 viewed along the direction of arrow D. FIG. 3 is a perspective view showing how the sewage slope plate is attached to the support rod in the slope plate device of FIG. 2; FIG. 3 is a perspective view showing how the sewage slope plate is attached to the support rod in the slope plate device of FIG. 2;

Hereinafter, a solid-liquid separation system according to an embodiment of the present invention will be described in detail based on the drawings.

<Configuration>
(Solid-liquid separation system 100)
FIG. 1 is a diagram showing a solid-liquid separation system 100 of this embodiment. The solid-liquid separation system 100 of this embodiment is applied to solid-liquid separation of treated water W in a final settling tank P of a sewage treatment plant.

As shown in FIG. 1, the solid-liquid separation system 100 includes a final sedimentation tank P (an example of a sedimentation tank), an inclined plate device 10, a baffle plate 11, an overflow weir 12, a waterway 13, and an inflow section. 14, an outflow portion 15, a sludge scraper 16, a sludge hopper 17, a short-circuit flow prevention plate 18 (an example of a plate-shaped member), and a mounting member 19.

In the inflow section 14, raw water (water to be treated W) flows into the final settling tank P. The outflow section 15 is provided on the opposite side of the inflow section 14 in the final settling tank P, and the purified water W to be treated flows out from the final settling tank P.

The inclined plate device 10 is arranged at a portion downstream from the approximate center of the final settling tank P (on the outflow portion 15 side). The inclined plate device 10 has a plurality of sewage inclined plates 20. The plurality of sewage inclined plates 20 are arranged side by side from the upstream side to the downstream side, with the water surface side inclined toward the inflow portion 14 side.

The inclined plate device 10 is supported so as to sink to a predetermined depth from the surface of the water to be treated W and to ensure a predetermined space between it and the bottom surface of the final settling tank P. This support may be suspended from a beam member or the like, or may be placed on a support (not shown), for example. Details of the inclined plate device 10 will be explained in detail later.

The baffle plate 11 is provided on the upstream side (the inflow portion 14 side) of the inclined plate device 10 and approximately in the center of the final sedimentation basin P. The baffle plate 11 blocks the flow of the water W to be treated downstream (toward the outflow portion 15) within a region from the water surface to a predetermined depth. The baffle plate 11 is arranged so that its main surface is substantially perpendicular to the direction of water flowing from the inflow portion 14 .

The overflow weir 12 is arranged near the water surface of the water to be treated W on the downstream side (the outflow portion 15 side) of the baffle plate 11 . The overflow weir 12 is formed along the direction from the upstream side to the downstream side.

A waterway (trough) 13 is formed surrounded by an overflow weir 12 and connected to an outflow portion 15. Note that the structure is not limited to the overflow weir 12, and may be a structure in which a hole is formed in a pipe.

The water to be treated W that has flowed into the final settling tank P from the inflow part 14 is blocked in the water flow direction (direction of arrow D) by the baffle plate 11, and between the lower end of the baffle plate 11 and the bottom surface of the final settling tank P. descend towards the part. The treated water W that has passed between the bottom of the final settling tank P and the lower end of the baffle plate 11 becomes an upward flow J toward the waterway 13, and flows between the lower part 10a of the inclined plate device 10 and the sewage inclined plate 20. flows into and rises.

Then, the sludge of the water to be treated W settles while passing through the inclined plate device 10, and settles on the first surface 20a of the inclined plate for sewage 20, whereby the water to be treated W is purified. The sludge that has settled on the first surface 20a of the sewage slope plate 20 falls under its own weight as it accumulates.

The sludge scraper 16 is arranged near the bottom of the final settling tank P. Sedimented sludge M is deposited near the bottom of the final settling tank P. The accumulated sludge M is collected in a sludge hopper 17 and drained by the sludge scraper 16 rotating clockwise in FIG. 1 . The sludge scraper 16 passes near the water surface on the upstream side of the baffle plate 11 and also scrapes up floating matter.

The sludge hopper 17 is formed on the bottom of the final settling tank P near the inlet 14.
The short-circuit flow prevention plate 18 is arranged below the inclined plate device 10. The short-circuit flow prevention plate 18 provides resistance to water flowing into the front stage part of the inclined plate device 10, and suppresses unevenness in the amount of water flowing into the front stage part and the rear stage part. In addition, the short-circuit flow prevention plate 18 allows the water to be treated to pass between the baffle plate 11 and the inclined plate device 10 without passing between the sewage inclined plate 20 of the inclined plate device 10 to short-circuit the inclined plate device 10. prevent
The attachment member 19 attaches the short-circuit flow prevention plate 18 to the inclined plate device 10.

(Slanted plate device 10)
FIG. 2 is a perspective view schematically showing the configuration of a part of the inclined plate device 10. FIG. 3 is a side view showing the inclined plate device 10 and the baffle plate 11. FIG. 4A is a diagram showing the inclined plate device 10 in a cross section perpendicular to the direction D of the inclined plate device 10. FIG. 4B is a plan view showing the arrangement relationship between the short-circuit flow prevention plate 18 and the sewage slope plate 20.

FIG. 5A is a plan view showing the second surface 20b side of the sewage slope plate 20. FIG. 5(b) is a plan view showing the first surface 20a side of the sewage slope plate 20.
As shown in FIG. 2, the inclined plate device 10 includes a plurality of sewage inclined plates 20, a pair of upper frames 21, a pair of lower frames 22, a plurality of support rods 23, a plurality of hooks 24, have.

The pair of upper frames 21 are arranged along a direction D (an example of a predetermined direction) from the inflow section 14 to the outflow section 15. The pair of upper frames 21 are arranged parallel to each other.

The pair of lower frames 22 are arranged along the direction D from the inflow section 14 to the outflow section 15. The pair of lower frames 22 are arranged parallel to each other. The pair of upper frames 21 are arranged closer to the water surface than the pair of lower frames 22.

The plurality of support rods 23 are installed parallel to each other between the pair of upper frames 21 and also installed parallel to each other between the pair of lower frames 22.

The sewage slope plate 20 is attached to a pair of upper and lower support rods 23 at an angle with respect to a pair of upper frames 21 and a pair of lower frames 22.

As shown in FIGS. 4A and 4B, a plurality of sewage slope plates 20 (three in the figure) are arranged along the width direction F of the final settling tank P. In this case, for example, the upper frame 21 and the lower frame 22 located on the right side of the sewage slope plate 20 located on the leftmost side in FIG. It may also serve as the frame 21 and the lower frame 22. Moreover, the upper frame 21 and lower frame 22 located on the left side of the sewage slope plate 20 located on the rightmost side in FIG. It may also serve as the frame 22.

The upper frame 21 is latched and supported from above by hanging bolts 31, and the hanging bolts 31 are fixed to beam members 32 arranged along the width direction. Moreover, the girder material 32 is fixed to the opposing wall surface Ps of the final settling tank P. With such a configuration, the inclined plate device 10 is supported so as to sink to a predetermined depth from the water surface of the water to be treated W, and to ensure a predetermined space between it and the bottom surface of the final settling tank P. .

(Sewage slope plate 20)
The sewage slope plate 20 is formed of a generally rectangular member. The material for the sewage slope plate 20 is preferably hard vinyl chloride, but is not limited thereto. The material of the inclined plate is, for example, thermoplastic resin, vinyl resin such as polyvinyl chloride, carbonate resin such as polycarbonate, ester resin such as polyethylene terephthalate, acrylic resin such as polymethyl methacrylate, polypropylene, polyethylene, etc. olefin resins, styrene resins such as ABS, or copolymers or mixed resins thereof, thermosetting resins such as epoxy resins and unsaturated polyester resins, metals, ceramics, It may be made of wood, rubber, etc.

The sewage slope plate 20 has a first surface 20a on the upper frame 21 side and a second surface 20b on the lower frame 22 side. A plurality of sewage slope plates 20 are arranged in a line so as to be inclined along the length direction (direction D) of the upper frame 21 and the lower frame 22. The inclined plate device 10 is installed in a final sedimentation tank P of a sewage treatment plant with the lower frame 22 facing the bottom side of the final sedimentation tank P. The second surface 20b of the sewage slope plate 20 is directed toward the bottom side of the final settling tank P.

The sewage slope plate 20 is attached to support rods 23 arranged above and below by a plurality of hooks 24.
As shown in FIGS. 5(a) and 5(b), the sewage slope plate 20 has a first surface 20a, a second surface 20b, an upper end 20i, a lower end 20j, and a first end 20c. and a second end portion 20d.

When the sewage slope plate 20 is attached to the above-mentioned pair of upper frames 21, pair of lower frames 22, and support rod 23, as shown in FIG. It is arranged substantially parallel to the rod 23. Further, the upper end portion 20i is arranged above the upper frame 21, and the lower end portion 20j is arranged below the lower frame 22.
The first end 20c and the second end 20d are arranged to be inclined from the upper frame 21 toward the lower frame 22.

The plurality of sewage slope plates 20 are arranged side by side along the direction D in which the water to be treated flows from the inflow portion 14 to the final settling tank P. The plurality of sewage slope plates 20 are arranged such that adjacent sewage slope plates 20 face each other and are parallel to each other.

Specifically, as shown in FIG. 3, the plurality of sewage inclined plates 20 are arranged such that the first surface 20a of one of the adjacent sewage inclined plates 20 and the first surface 20a of the other sewage inclined plate 20 are connected to each other. are arranged so that the second surfaces 20b of the two faces face each other.

As shown in FIGS. 1 to 3, each sewage slope plate 20 is inclined upward so as to be located on the inflow section 14 side, and includes a pair of upper frames 21, a pair of lower frames 22, and It is supported by a plurality of support rods 23. As shown in FIG. 3, the sewage slope plate 20 is arranged such that the upper end 20i is located closer to the inlet 14 than the lower end 20j.

Further, the angle θa between the sewage inclined plate 20 and the direction of arrow D (corresponding to the horizontal direction in this embodiment) in a side view is preferably 10 degrees or more and 70 degrees or less, and particularly preferably 60 degrees. The angle θb formed between the sewage inclined plate 20 and the vertical direction G is preferably set to 20 degrees or more and 80 degrees or less, particularly preferably 30 degrees.

By being within this range, the effective settling area of the solid-liquid separation system can be ensured.
A sludge trapping process is performed on the second surface 20b of the sewage slope plate 20 shown in FIG. 5(a). Here, the sludge capture process is a process that makes the second surface 20b of the sewage slope plate 20 easy to accumulate sludge so that the sludge in the water to be treated does not flow out from the final settling tank P. For example, by increasing the roughness of the surface of the inclined plate, or by forming irregularities in the direction along or perpendicular to the movement of sludge along the surface, sludge can be made to adhere to the surface of the inclined plate more easily. However, it is not limited to this. The method of roughening the surface is not particularly limited, but may be mechanical processing such as sandblasting, or fine etching with a predetermined chemical or molding with a predetermined surface roughness. Press processing or the like may also be used. Further, the capturing process does not need to be applied to the entire second surface 20b.

The first surface 20a opposite to the second surface 20b is preferably a flat surface so that sludge can easily slide off.
Note that the sewage slope plate 20 can be made by profile extrusion molding, injection molding, etc., but extrusion molding is preferable.

Furthermore, grooves 33 are provided on the second surface 20b of the sewage slope plate 20 along each of the first end 20c and the second end 20d. A hook hole 33b is formed in the groove 33, and the above-mentioned hook 24 is attached to the hook hole 33b. The sewage slope plate 20 is attached to the support rod 23 of the slope plate device 10 by the hook 24 attached to the hook hole 33b. Further, a protruding portion 33a facing the groove portion 33 is formed on the first surface 20a.

(Short circuit flow prevention plate 18)
The short-circuit flow prevention plate 18 suppresses unevenness in the amount of water flowing into the inclined plate device 10.
The short circuit flow prevention plate 18 is a plate-shaped member. The short-circuit flow prevention plate 18 is arranged below the inclined plate device 10.

The material of the short-circuit flow prevention plate 18 is preferably made of, for example, SUS304, but is not limited thereto. The material of the short-circuit flow prevention plate 18 is preferably a thermoplastic resin, for example, or specifically, a vinyl resin such as polyvinyl chloride, a carbonate resin such as polycarbonate, an ester resin such as polyethylene terephthalate, polymethyl methacrylate, etc. It may be an acrylic resin, an olefin resin such as polypropylene or polyethylene, a styrene resin such as ABS, or a copolymer or mixed resin thereof, or a thermosetting resin such as an epoxy resin or an unsaturated polyester resin. It may be made of metal, ceramic, wood, rubber, etc.

FIG. 6A is a plan view of the short-circuit flow prevention plate 18. The size of the short-circuit flow prevention plate 18 is not particularly limited, and it may be installed so as to cover an area where inflow water is concentrated. In addition, in order to suppress the bias of inflow water, it is preferable not to install the short-circuit flow prevention plate 18 below the outflow part 15 side (rear stage part) of the inclined plate device 10 where the flow velocity is slow. The short circuit flow prevention plate 18 has a plurality of openings 18a. Although the shape and size of the opening 18a are not limited, the aperture ratio (%) of the opening 18a in the short-circuit flow prevention plate 18 is preferably 5 to 90%, and 15 to 50%. is even more preferable. Here, the aperture ratio (%) is calculated by the following formula (1).
Opening ratio (%) = (total opening area/apparent area of short circuit flow prevention plate) x 100...(1)

Note that the total area of the openings means the plane area per opening x the number of openings. The apparent area of the short circuit flow prevention plate is the area of the short circuit flow prevention plate when no opening is formed.

As an example, the short circuit flow prevention plate 18 shown in FIG. 6(a) has a plurality of circular openings 18a. The aperture ratio of the openings 18a in the short-circuit flow prevention plate 18 is 40%, and the openings 18a are arranged in a 60-degree staggered manner. Note that, as will be described later, the short-circuit flow prevention plate 18 has an edge portion 18b in which two opposing edges are bent downward. Since the edge 18b of the short-circuit flow prevention plate 18 comes into contact with a mounting member 19, which will be described later, the edge 18b is not included in the apparent area of the short-circuit flow prevention plate.

The short-circuit flow prevention plate 18 is arranged along the direction of arrow D, as shown in FIG. It can also be said that the short circuit flow prevention plate 18 is arranged along the horizontal direction. It can also be said that the short-circuit flow prevention plate 18 is arranged along the lower end portions 20j of the plurality of sewage slope plates 20.

Further, as shown in FIG. 3, the short-circuit flow prevention plate 18 is disposed on the outflow portion 15 side of the baffle plate 11 and above the lower end 11e of the baffle plate 11. In addition, it may be at the same height as 11e, and may be in any position as long as it can suppress the short circuit current.

The short-circuit flow prevention plate 18 is installed so as to include the area of the inclined plate device 10 where the inflow water is concentrated, and is placed near the baffle plate 11, for example.

As shown in FIG. 4A, in the width direction F, the short-circuit flow prevention plate 18 is provided so as to face the entire area of the inclined plate device 10. It can also be said that the short-circuit flow prevention plate 18 is arranged so as to cover the entire inclined plate device 10 from below in the width direction F. In the present embodiment, a plurality of short-circuit flow prevention plates 18 are arranged along the width direction F, but the number of short-circuit flow prevention plates 18 is not limited to a plurality of plates, and one plate may be used.

In the example shown in FIG. 4B, three short-circuit flow prevention plates 18 are arranged along the width direction F, and a row of sewage slope plates 20 is arranged above each short-circuit flow prevention plate 18.
In this embodiment, as shown in FIG. 4B, the short-circuit flow prevention plate 18 is arranged so that a part thereof overlaps with the plurality of sewage slope plates 20 in a plan view.

This makes it difficult for water to flow between the sewage slope plates 20 arranged above the short-circuit flow prevention plate 18. For this reason, for example, by arranging the short-circuit flow prevention plate 18 at the front stage of the inclined plate device 10 where inflow water tends to concentrate, it becomes difficult for water to flow into the front stage, and the flow rate flowing into the rear stage can be increased. Unbalanced flow rate can be suppressed.

Further, in the present embodiment, for example, the short-circuit flow prevention plate 18 is configured such that some of the plurality of sewage inclined plates 20 are extended downward in the direction of the arrow D, as shown in FIG. They are arranged so that they intersect. In addition, from the viewpoint of alleviating concentration of inflow water and preventing short-circuit flow, the short-circuit flow prevention plate 18 intersects when the sewage slope plate 20 disposed closest to the baffle plate 11 is extended downward. It is more preferable to arrange them as follows. In FIG. 3, an extension line L extending the sewage inclined plate 20 downward is shown in a side view.

In this embodiment, some of the sewage slope plates 20 that intersect with the short circuit flow prevention plate 18 when stretched are arranged from the sewage slope plate 20 located closest to the baffle plate 11, as shown in FIG. The four up to the fourth slope plate 20 correspond to the sewage slope plate 20, but the number is not limited to four, as long as they can be placed in a place where there is a large amount of water flowing in.

In addition, it can be said that the short-circuit flow prevention plate 18 is arranged so as to block the flow path (between adjacent sewage slope plates 20) formed by some of the sewage slope plates 20 from below.

Thereby, the short-circuit flow prevention plate 18 can be arranged at a location where inflow water is concentrated.
Further, when the distance between the baffle plate 11 and the lower end 20j of the sewage inclined plate 20 disposed closest to the baffle plate 11 is W, the short-circuit flow prevention plate 18 faces at least a part of the gap W. It is preferable that the In addition, when the short-circuit flow prevention plate 18 faces at least a portion of the gap W, it can also be said that the short-circuit flow prevention plate 18 is arranged so as to close at least a portion of the gap W in a plan view. Moreover, it is more preferable that the short-circuit flow prevention plates 18 are arranged so as to face each other over the entire interval W as much as possible.

Thereby, it is possible to suppress a short-circuit flow that passes through the interval W and passes above the inclined plate device 10 toward the outflow portion 15 without flowing between the sewage inclined plates 20.

Examples of other short circuit current prevention plates are also shown below. Note that in the examples shown in FIGS. 6(b) to 9(b), edges are not shown.

The short-circuit flow prevention plate 118 shown in FIG. 6(b) has a plurality of circular openings 118a. The aperture ratio of the opening 118a in the short-circuit flow prevention plate 118 is 40%. In the short-circuit flow prevention plate 118, the openings 118a are arranged in a staggered pattern.

The short-circuit flow prevention plate 218 shown in FIG. 7(a) has a plurality of circular openings 218a. The aperture ratio of the openings 218a in the short-circuit flow prevention plate 218 is 38%. In the short circuit flow prevention plate 218, the openings 218a are arranged in parallel.

The short circuit flow prevention plate 318 shown in FIG. 7(b) has a plurality of circular openings 318a. The aperture ratio of the opening 318a in the short-circuit flow prevention plate 318 is 25%. In the short-circuit flow prevention plate 218, the openings 218a are arranged in a 60-degree staggered pattern. The openings 318a of the short-circuit flow prevention plate 318 have the same size as the openings 18a of the short-circuit flow prevention plate 18, but the pitch between the openings is longer.

The short-circuit flow prevention plate 418 shown in FIG. 8(a) has a plurality of oval hole-shaped openings 418a. The aperture ratio of the opening 418a in the short-circuit flow prevention plate 418 is 40%. In the short-circuit flow prevention plate 418, the openings 418a are arranged in a staggered manner.

The short-circuit flow prevention plate 518 shown in FIG. 8(b) has a plurality of rectangular hole-shaped openings 518a. The aperture ratio of the opening 518a in the short-circuit flow prevention plate 518 is 44%. In the short-circuit flow prevention plate 518, the openings 518a are arranged in a staggered manner.

The short circuit flow prevention plate 618 shown in FIG. 9(a) has a plurality of hexagonal openings 618a. The aperture ratio of the opening 618a in the short-circuit flow prevention plate 618 is 40%. In the short-circuit flow prevention plate 618, the openings 618a are arranged in a 60-degree staggered pattern.

The short-circuit flow prevention plate 718 shown in FIG. 9(b) has a plurality of square hole-shaped openings 718a. The aperture ratio of the opening 718a in the short-circuit flow prevention plate 718 is 40%. In the short circuit flow prevention plate 718, the openings 718a are arranged in parallel.

(Mounting member 19)
The attachment member 19 attaches the short-circuit flow prevention plate 18 to the inclined plate device 10. 10(a) is a side view of the mounting member 19, and FIG. 10(b) is a view of the mounting member 19 viewed along the direction of arrow D.

Attachment member 19 is attached to lower frame 22 . The mounting member 19 includes a first metal fitting 41, a second metal fitting 42, and a third metal fitting 43. The first metal fitting 41 is a long plate-like member. The second metal fitting 42 is a long plate-like member, and is formed longer than the first metal fitting 41.

The first metal fitting 41 has two through holes 41a arranged above and below. The second metal fitting 42 is formed with two through holes 42a arranged vertically, and a long hole 42b arranged below the two through holes 42a and elongated in the vertical direction.

The first metal fitting 41 and the second metal fitting 42 are attached to the lower frame 22 so as to face each other in the width direction F and sandwich the lower frame 22 with the spacer 50 in between.

The first metal fitting 41 and the second metal fitting 42 are arranged such that the two through holes 41a and the two through holes 42a face each other. One of the through holes 41 a and 42 a is located above the lower frame 22 , and the other through hole 41 a and 42 a is located below the lower frame 22 . The spacer 50 is disposed between the first metal fitting 41 and the second metal fitting 42 and above and below the lower frame 22. A through hole 50a is formed in the spacer 50. The through hole 50a is arranged to face the through hole 41a and the through hole 42a.

A bolt 44 is inserted into each of the two sets of through holes 41a, 42a, and 50a, and a nut 45 is fitted onto the bolt 44. In this way, the mounting member 19 is connected to the inclined plate device 10 by sandwiching the lower frame 22 between the first metal fitting 41 and the second metal fitting 42.

The third metal fitting 43 has a connecting part 431 connected to the second metal fitting 42 and an arrangement part 432 in which the short circuit current prevention plate 18 is arranged. The connecting portion 431 has a plate shape that is long in the vertical direction, and has through holes 431a and 431b at the top and bottom. The through hole 431a is formed in the upper part of the connection part 431. The bolt 46 is inserted through the through hole 431a and the elongated hole 42b, and a nut 47 is fitted to the tip thereof.

The arrangement section 432 has a plate shape and is fixed to the lower end of the connection section 431. The arrangement section 432 is arranged perpendicularly to the connection section 431. The third metal fitting 43 is formed in an inverted T-shape along the direction of arrow D.

The edge 18b of the short-circuit flow prevention plate 18 is bent downward. The short-circuit flow prevention plate 18 is arranged on the mounting member 19 so that the edge 18b is arranged on the upper surface of the arrangement part 432. A through hole 18c is formed in the edge 18b, and a bolt 48 is inserted through the through hole 18c and the through hole 431b of the third metal fitting 43, and a nut 49 is fitted to the tip of the bolt 48. . Thereby, the short-circuit flow prevention plate 18 is fixed to the third metal fitting 43.

In addition, by loosening the nut 47 and sliding the bolt 46 inserted through the through hole 431a in the vertical direction (see arrow) within the elongated hole 42b, the vertical direction of the third metal fitting 43 relative to the second metal fitting 42 can be adjusted. The position can be adjusted. Thereby, the position of the short-circuit flow prevention plate 18 from the inclined plate device 10 can be adjusted. These second metal fittings 42 and third metal fittings 43 correspond to an example of an adjustment mechanism.

The mounting member 19 is configured such that the distance H (see FIG. 3) between the lower end 20j of the sewage slope plate 20 and the short-circuit flow prevention plate 18 can be adjusted between 0 and 1000 mm.

Since the short-circuit flow prevention plate 18 arranged in this way acts as a resistance to water flow, it becomes difficult for water to flow between the sewage slope plates 20 arranged above the short-circuit flow prevention plate 18. For this reason, for example, by arranging the short-circuit flow prevention plate 18 at the front stage of the inclined plate device 10 where inflow water is concentrated, it becomes difficult for water to flow into the front stage, and the flow rate flowing into the rear stage can be increased.

That is, by appropriately arranging a plate-like member below the sewage slope plate 20 where the inflow water is larger than the others, the flow rate can be distributed as evenly as possible and unevenness in the flow rate can be suppressed.

Moreover, by arranging the short-circuit flow prevention plate 18 so as to face at least a part of the distance W between the baffle plate 11 and the lower end portion 20j of the sewage inclined plate 20 disposed closest to the baffle plate 11 side. , it is possible to suppress a short-circuit flow that passes through the interval W, passes through the upper side of the inclined plate device 10, and heads toward the outflow portion 15 without flowing between the sewage inclined plates 20.

<Installation method>
A method for attaching the sewage slope plate 20 to the support rod 23 according to the embodiment of the present invention will be described below.

11 and 12 are perspective views showing how the sewage slope plate 20 is attached to the support rod 23.

As shown in FIG. 11, the sewage slope plate 20 is constructed by passing between the support rods 23 from below the lower frame 22 and locking four hooks 24 to the support rods 23 as shown in FIG. It is attached.

By attaching from below in this way, the sewage slope plate 20 can be placed on the support rod 23 between the pair of upper frames 21 and the support rod 23 between the pair of lower frames 22.

Next, as shown in FIG. 10, after the attachment member 19 is attached to the lower frame 22, the short-circuit flow prevention plate 18 is placed in the placement portion 432. Then, the short circuit flow prevention plate 18 is fixed to the mounting member 19 with bolts 48 and nuts 49. Note that the attachment member 19 may be attached to the lower frame 22 in advance.

<Other embodiments>
Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the spirit thereof.

(A)
The sewage slope plate 20 of the embodiment described above may be divided into a plurality of slope plates. In that case, a connecting member connecting between the plurality of sewage slope plates 20 may be provided.

(B)
In the above embodiment, the sewage slope plate 20 is supported by the support rod 23 by the hook 24, but it is not limited to the hook, and a plurality of sewage slope plates 20 can be arranged side by side. However, the supporting method is not limited.

(C)
In the above embodiment, a part of the sewage slope plate 20 on the side of the baffle plate 11 is covered from below with one short-circuit flow prevention plate 18 in the direction of the arrow D from the interval W, but the present invention is not limited to this. Instead, it may be divided into a plurality of short circuit flow prevention plates 18. Further, gaps may be provided between the plurality of short-circuit current prevention plates.

(D)
In the above embodiment, the edge 18b is provided on the short circuit current prevention plate 18, but the edge 18b may not be provided. In that case, for example, both the arrangement portion 432 and the short circuit current prevention plate 18 It is sufficient to form through holes in the vertical direction and fix them with bolts and nuts.

(E)
In the embodiment described above, the short-circuit flow prevention plates 18 are arranged to face both the interval W and between some of the sewage inclined plates 20. 20 may be arranged so that only one of them faces each other.

(F)
In the embodiment described above, the short-circuit flow prevention plate 18 is attached to the inclined plate device 10 via the attachment member 19, but the present invention is not limited to this. The prevention plate 18 may be connected, or the short circuit flow prevention plate 18 may be connected to the lower end of the baffle plate 11.

The solid-liquid separation system of the present invention exhibits the effect of being able to suppress uneven flow rates in a plurality of inclined plates without reducing the effective settling area, and is useful as a final settling tank in a sewage treatment facility.

10: Inclined plate device 11: Current baffle plate 12: Overflow weir 13: Channel 14: Inflow section 15: Outflow section 16: Machine 17: Sludge hopper 18: Short-circuit flow prevention plate 19: Mounting member 20: Sewage inclined plate P :Final sedimentation tank

Claims (4)

a settling pond;
an inclined plate device installed in the sedimentation basin and having a plurality of inclined plates;
a plate-like member arranged so as to partially overlap the plurality of inclined plates in plan view;
an inflow portion through which the water to be treated flows into the settling tank;
an outflow section through which treated water flows out from the settling tank;
a baffle plate disposed on the inflow section side of the inclined plate device,
The plate member is connected to the inclined plate device,
The plate-like member is arranged on the outflow portion side of the baffle plate,
The plate-like member is arranged along a direction from the inflow section toward the outflow section, facing at least a part of the gap between the inclined plate and the baffle plate disposed closest to the baffle plate. and is not disposed on the lower side of the outflow portion side of the inclined plate device.
Solid-liquid separation system. the plate-like member has an opening;
The solid-liquid separation system according to claim 1. The opening has an area of 5 to 90% of the area of the plate member assuming that the opening is not formed.
The solid-liquid separation system according to claim 2 . The plate member is connected to the inclined plate device so that a distance between the plate member and the lower end of the inclined plate can be adjusted within a range of 0 to 1000 mm. solid-liquid separation system.

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