JP7436092B2 - 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. For example, there is a need to increase the capacity of

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 the existing final sedimentation tank, a technique has been proposed that uses inclined plates to improve the processing capacity with a small investment in equipment (see Patent Document 1).

Patent No. 6182190 specification

However, because the flow channel cross section is rapidly reduced by the inlet baffle plate placed upstream of the inclined plate device (the cross section of the channel through which the water flow passes is suddenly narrowed), the water flow is The speed of the water flow increased as it flowed into the space below the inclined plate device, and the flow velocity distribution in the space below the inclined plate device was unbalanced between the front stage and the back stage.

An object of the present invention is to provide a solid-liquid separation system that can suppress imbalance in flow velocity distribution in the space below the inclined plate device.

In order to achieve the above object, a solid-liquid separation system according to a first aspect of the present invention includes a settling basin, an inflow section, an outflow section, and an inclined plate device. Sedimentation basins are used in sewage treatment plants. 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 inclined plate device has a plurality of inclined plates, and is disposed between the inlet and the outlet with a predetermined lower space opened from the bottom of the sedimentation tank. A water flow guide surface facing a part of the inclined plate is provided from a position above the water surface of the water to be treated to the bottom surface of the inclined plate device.

By providing a water flow guide surface in this way, it is possible to reduce the sudden contraction of the flow path when the water to be treated flows into the lower side of the inclined plate, so the speed of the water flow flowing into the space below the inclined plate device can be reduced. This makes it possible to suppress the increase. Therefore, imbalance in the flow velocity distribution in the space below the inclined plate device can be suppressed.

In addition, in this specification, "opposing" also includes opposing via another member.
The solid-liquid separation system according to the second invention is the solid-liquid separation system according to the first invention, in which the water flow guide surface includes a surface on the inflow part side of the endmost inclined plate disposed on the inflow part side; It also serves as either the inlet side surface of a further provided baffle plate, or the inlet side surface of the most inclined plate and a further provided baffle plate.

As a result, the water flow guide surface can be formed using the inlet side surface of at least one of the inclined plate and the baffle plate, so it is possible to reduce sudden contraction of the flow path with a simple configuration without increasing the number of parts. can.

The solid-liquid separation system according to the third invention is the solid-liquid separation system according to the first or second invention, in which the length of the inclined part of the water flow guide surface is 100 to 2000 mm, The angle formed by the horizontal direction is 20° to 70°.

Thereby, the sludge that has settled on the member on which the water flow guide surface is formed can be appropriately dropped onto the bottom surface of the settling tank.

The solid-liquid separation system according to the fourth invention is the solid-liquid separation system according to the second invention, and includes at least one first support part and one second support part. The first support part supports the inclined plate device on the settling basin. The second support part supports the baffle plate on the settling basin. The first support part and the second support part are separately fixed to the side wall of the settling tank.

As a result, when vibrations are applied due to an earthquake or the like, the two do not affect each other, and therefore earthquake resistance can be improved.

According to the present invention, it is possible to provide a solid-liquid separation system that can suppress imbalance in flow velocity distribution in the space below the inclined plate device.

1 is a side view showing a solid-liquid separation system according to Embodiment 1 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. 2 is a cross-sectional view schematically showing a section along line AA' in FIG. 1; The figure which shows the state where the baffle board, the suspension bolt and girder material connected to the baffle board are omitted from FIG. (a) A plan view showing the second surface of the inclined plate for sewage in FIG. 1, (b) A plan view showing the first surface of the inclined plate for sewage in FIG. 1. The side view which shows the water flow in the vicinity of the inlet baffle plate and the sewage slope plate in the embodiment according to the present invention. The side view which shows the water flow in the vicinity of the conventional inlet baffle plate and sewage slope plate. The side view which shows the water flow in the vicinity of the conventional inlet baffle plate and sewage slope plate. FIG. 3 is a partial side view showing a solid-liquid separation system in Embodiment 2 of the present invention. FIG. 7 is a partial side view showing a solid-liquid separation system in Embodiment 3 of the present invention. The perspective view which shows the inclined plate in the modification of embodiment concerning this invention.

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

(Embodiment 1)
A solid-liquid separation system 100 according to Embodiment 1 of the present invention will be described below.

<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 settling tank P (an example of a settling tank), an inclined plate device 10, an inlet baffle plate 11 (an example of a baffle plate), and an overflow weir. 12, a waterway 13, an inflow section 14, an outflow section 15, a sludge scraper 16, and a sludge hopper 17.

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 water surface WS of the water to be treated W, and to secure a predetermined lower space 42 between it and the bottom surface PB 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 inlet baffle plate 11 prevents the water to be treated W from flowing downstream (toward the outlet 15) within a region from the water surface to a predetermined depth.

The overflow weir 12 is arranged near the water surface of the water to be treated W on the downstream side (outflow section 15 side) of the inflow section 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.

Here, in the final sedimentation tank P, the space from the inflow part 14 to the inflow baffle plate 11 is defined as an upstream space 41, the space below the inclined plate device 10 is defined as a lower space 42, and the space from the upstream space 41 to the inflow baffle plate 11 is defined as an upstream space 41, A space into which water flows into the side space 42 is defined as an inflow path 43. The inflow path 43 will be described later, but is formed between the second surface 2b (described later) and the bottom surface PB of the sewage slope plate 20P.

The water to be treated W flowing into the final settling tank P from the inflow section 14 passes through the upstream space 41 and is blocked by the inflow section baffle plate 11 in the water flow direction (the direction of arrow D (an example of a predetermined direction)). descends and flows into the lower space 42 through the inflow path 43. The water to be treated W flowing into the lower space 42 becomes an upward flow J toward the water channel 13, flows from the bottom surface 10a of the inclined plate device 10 to between the sewage inclined plate 20, and rises.

Then, while passing through the inside of the inclined plate device 10, the sludge of the water to be treated W collides with the second surface 20b of the sewage inclined plate 20 and is captured or settles, and the sludge is trapped or settled. The water to be treated W is purified by precipitation. 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 inlet 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.
(Slanted plate device 10)
FIG. 2 is a perspective view schematically showing the configuration of a part of the inclined plate device 10. As shown in FIG. FIG. 3 is a side view showing the inclined plate device 10 and the inlet baffle plate 11.
As shown in FIGS. 2 and 3, 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, and a plurality of hooks. 24 and a plurality of upper and lower frames 25.

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 upper frame 21 and the lower frame 22, which are arranged vertically on one side and the other side of the width direction F, have a plurality of upper and lower frames arranged along the vertical direction G at their upstream and downstream ends. They are connected by a frame 25 (see FIG. 3). Note that the vertical direction G includes a vertically upward direction and a vertically downward direction. The vertically upward direction is indicated by Gu in FIGS. 7A to 7C, which will be described later, and the vertically downward direction is indicated by Gd.

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.
FIG. 4 is a schematic cross-sectional view taken along line AA' in FIG. FIG. 5 is a diagram showing a state in which the inflow baffle plate 11, hanging bolts 33, and girder members 34 are removed from FIG. 4.
As shown in FIGS. 4 and 5, 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 lower frame 22 located on the right side of the sewage slope plate 20 located on the leftmost side in FIGS. 4 and 5 are located on the left side of the middle sewage slope plate 20. It may also serve as the upper frame 21 and the lower frame 22. Further, in FIGS. 4 and 5, the upper frame 21 and lower frame 22 located on the left side of the sewage slope plate 20 located on the rightmost side are the upper frame 21 and the lower frame 22 located on the right side of the middle sewage slope plate 20. It may also serve as the lower frame 22.

As shown in FIG. 5, the upper frame 21 is supported from above by hanging bolts 31, and the hanging bolts 31 are fixed to beam members 32 arranged along the width direction F. The girder material 32 is fixed to the opposing wall surface Ps of the final settling tank P. Further, a plurality of beam members 32 are arranged along the direction D as shown in FIG. 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 PB of the final settling tank P. There is. These hanging bolts 31 and girder members 32 correspond to an example of the first support portion.

(Sewage slope plate 20)
The sewage slope plate 20 is formed of a generally square member. The material for the sewage slope plate 20 is preferably PVC (polyvinyl chloride), particularly 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.

Note that the sewage slope plate 20 can be made by profile extrusion molding, injection molding, etc., but extrusion molding is preferable.

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 the final sedimentation tank P of a sewage treatment plant with the lower frame 22 facing the bottom surface PB side of the final sedimentation tank P. A second surface 20b (described later) of the sewage slope plate 20 is directed toward the bottom surface PB 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.
FIG. 6A is a plan view showing the second surface 20b side of the sewage slope plate 20. FIG. 6(b) is a plan view showing the first surface 20a side of the sewage slope plate 20.

As shown in FIGS. 6(a) and 6(b), the sewage slope plate 20 has a first surface 20a, a second surface 20b, an upper end 20i, a lower end 20j, a first end 20c, and a second surface 20b. It has two ends 20d.

When the sewage slope plate 20 is attached to the pair of upper frames 21, the pair of lower frames 22, and the support rods 23, as shown in FIG. is placed approximately parallel to the Further, the upper end 20i is arranged above the upper frame 21, and the lower end 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. Further, the positions of the lower ends 20j of the plurality of sewage inclined plates 20 in the vertical direction G are substantially the same.

Here, a virtual surface connecting the lower ends 20j is defined as the bottom surface 10a of the inclined plate device 10. In FIG. 3, the bottom surface 10a is indicated by a two-dot chain line. In this embodiment, since the positions of the lower ends 20j of the plurality of sewage inclined plates 20 in the vertical direction are substantially the same, the bottom surface 10a is formed substantially horizontally, but the bottom surface 10a is not limited to this. When the positions of the lower ends 20j of the plurality of sewage inclined plates 20 in the vertical direction are different, the bottom surface 10a is set in accordance with the position of the lowest end 20j.

As shown in FIGS. 1 to 3, each sewage slope plate 20 is inclined so as to be located on the inflow part 14 side as it goes upward, and includes a pair of upper frames 21, a pair of lower frames 22, and a plurality of sewage slope plates 20. is supported by a support rod 23 and a plurality of upper and lower frames 25. As shown in FIG. 3, the sewage slope plate 20 is arranged such that the upper end 20i is located closer to the inflow portion 14 than the lower end 20j.

Further, as shown in FIG. 3, the sewage slope plate 20 (denoted as 20P) that is disposed on the most upstream side (disposed on the inflow baffle plate 11 side) is disposed between the upper and lower frames 25. The support rod 23 is disposed between the support rod 23 and the lower frame 22, and is supported by being hooked to the support rod 23 with a hook 24.

A sludge trapping process is performed on the second surface 20b of the sewage slope plate 20 shown in FIG. 6(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.

Further, the second surface 20b of the sewage slope plate 20 is provided with grooves 20e along each of the first end 20c and the second end 20d. A hook hole 20eb is formed in the groove 20e, and the above-mentioned hook 24 is attached to the hook hole 20eb. 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 20eb. Moreover, a protrusion 20f facing the groove 20e is formed on the first surface 20a.

As shown in FIG. 3, the position of the hook hole 20eb on the upper end 20i side of the sewage slope plate 20P disposed closest to the inlet baffle plate 11 is different from the position of the other sewage slope plates 20P. It is provided below the other sewage slope plates 20. In FIGS. 6(a) and 6(b), the hook hole 20eb' on the upper end 20i side of the sewage inclined plate 20P is shown by a chain double-dashed line.

In the side view of FIG. 3, the angle θa formed by at least the sewage inclined plate 20P and the direction of arrow D (corresponding to the horizontal direction in this embodiment) is preferably 20 degrees or more and 70 degrees or less, and 60 degrees is preferable. Particularly preferred. In addition, in this embodiment, all the sewage slope plates 20 are arranged parallel to each other. By being within this range, the effective settling area of the solid-liquid separation system can be ensured.

Further, the length L between the upper end 20i and the lower end 20j of the sewage inclined plate 20P can be set to 100 to 2000 mm. In this embodiment, the sewage slope plate 20P and the other sewage slope plates 20 are formed to have the same size, but they may be different in size. The second surface 20b of the sewage inclined plate 20P corresponds to an example of the inclined portion of the water flow guide surface.

(Inflow baffle plate 11)
As shown in FIG. 3, the inflow baffle plate 11 is provided on the upstream side (the inflow part 14 side) of the inclined plate device 10 and approximately in the center of the final settling basin P. The inflow baffle plate 11 is arranged so that its main surface is substantially perpendicular to the direction of water flowing from the inflow part 14 . The surface of the inflow baffle plate 11 on the inflow part 14 side is designated as 11a. The water flow blocked by the surface 11a of the inlet baffle plate 11 becomes a downward flow and is guided to the lower side of the inclined plate device 10.

As shown in FIG. 4, the inlet baffle plate 11 is formed so that its length in the width direction F is approximately the same as the length in the width direction F of the final settling tank P.

The lower end 11e of the inflow baffle plate 11 is located above the upper end 20i of the sewage inclined plate 20P disposed on the most upstream side (also referred to as the inflow part 14 side). In order to smoothly guide the water flow to the lower side of the inclined plate device 10, it is necessary to 20i is preferably narrower.

Note that the lower end 11e of the inflow baffle plate 11 and the upper end 20i of the sewage inclined plate 20P are not mechanically connected. Since the structure is not connected, the sewage slope plate 20P is less likely to receive the energy generated by vibrations directly, so that damage can be avoided.

The inflow baffle plate 11 is supported by hanging bolts 33, as shown in FIG. 4, and the hanging bolts 33 are fixed to beam members 34 arranged along the width direction F. The girder material 34 is fixed to the opposing wall surface Ps of the final settling tank P. With such a configuration, the inflow baffle plate 11 can be supported in the vertical direction above the upper end 20i of the sewage inclined plate 20P. Furthermore, the hanging bolts 33 and the beam members 34 correspond to an example of the second support portion.
The material of the inflow baffle plate 11 is most preferably PVC (polyvinyl chloride), but is not limited thereto. The material of the inflow baffle plate 11 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, etc. It may be 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.

In the first embodiment, the water to be treated W flowing in from the inflow section 14 is guided to the lower space 42 of the inclined plate device 10 by the inflow section baffle plate 11 and the above-mentioned sewage inclined plate 20P.

(Water to be treated flows into the lower space)
FIG. 7A is a side view showing water flow in the vicinity of the inlet baffle plate 11 and the sewage slope plate 20P.
In the first embodiment, the water to be treated W flowing in from the inflow portion 14 flows through the upstream space 41, and its flow is blocked by the surface 11a of the inflow baffle plate 11 and descends. The descended treated water W flows toward the bottom surface PB along the slope of the second surface 20b of the endmost sewage slope plate 20P, and flows into the lower space 42 below the slope plate device 10. The surface 11a of the inflow section baffle plate 11 on the inflow section 14 side and the second surface 20b of the endmost sewage slope plate 20P on the inflow section 14 side correspond to an example of a water flow guide surface.

Note that the water flow guide surface in the present invention is composed of a baffle plate, a part of an inclined plate, and other parts used in a transverse flow type sedimentation basin. The water flow guide surface forms a flow path through which a water flow flowing from the lower side of the inclined plate device to the upper side flows into the lower side of the inclined plate device 10. The water flow guide surface can reduce water flow resistance and suppress the occurrence of short circuit flow. A water flow guiding surface is a surface that can reduce the resistance of water flow and suppress the occurrence of short circuit flow.
As shown in FIG. 7A, the inflow path 43, which is a space where the water to be treated W flows into the lower space 42 from the upstream space 41, has a bottom surface PB and a second surface 20b of the sewage slope plate 20P on the most upstream side. It is formed by both wall surfaces Ps. In FIG. 7A, the sludge scraper 16 is omitted for clarity.

In the side view of FIG. 7A, the surface from the inlet baffle plate 11 in the vertical direction G to the bottom surface PB is S1, and the surface from the lower end 20j of the sewage slope plate 20P in the vertical direction G to the bottom surface PB is S2. Then, the above-mentioned upstream space 41 corresponds to a space upstream of the surface S1 (which can also be called a space on the inflow section 14 side). Further, the above-mentioned lower space 42 corresponds to a space on the downstream side of the surface S2 (which can also be called a space on the outflow portion 15 side). The inflow path 43 corresponds to the space between the surface S1 and the surface S2.

The upper end 20i of the sewage slope plate 20P is arranged near the lower end 11e of the inflow baffle plate 11, and the upper end 20i of the sewage slope plate 20P is inclined so as to be located closer to the inflow baffle plate 11 than the lower end 20j. ing. Therefore, the height of the inflow path 43 in the vertical direction gradually becomes narrower as it goes from the upstream space 41 toward the lower space 42 (in the direction of arrow D), and the flow path area gradually becomes smaller.

<Effect>
FIG. 7B is a diagram showing the positional relationship between the conventional inflow baffle plate 1011 and the inclined plate device 1010. In FIG. 7B, an inflow section baffle plate 1011 arranged along the vertical direction G, an inflow section lower baffle plate 1012 installed horizontally toward the downstream side from the lower end 1011e of the inflow section baffle plate 1011, and an inflow section baffle plate 1011 arranged along the vertical direction G. An inclined plate device 1010 disposed downstream of the baffle plate 1011 is shown.
The inflow section lower baffle plate 1012 is a member for inhibiting water flow from flowing into the space between the inflow section baffle plate 1011 and the inclined plate device 1010 when the water flow passes through the inflow port 1043 . The length of the inflow section lower baffle plate 1012 is from the lower end 1011e to the nearest inclined plate 1020P. Specifically, the length of the inflow section lower baffle plate 1012 is set until the horizontal position of the downstream end of the inflow section lower baffle plate 1012 matches the horizontal position of the lower end 1020j of the inclined plate 1020P. The length is set to .
In addition, in FIG. 7B, since the inflow part lower baffle plate 1012 is installed horizontally from the lower end 1011e toward the downstream side, the inflow part lower baffle plate 1012 is sedimented and separated on the surface of the inflow part lower baffle plate 1012 on the Gu side in the vertically upward direction. Suspended solids are deposited.
In the conventional configuration as shown in FIG. 7C, the inlet lower baffle plate 1013 is installed toward the downstream side from the part of the inlet baffle plate 1011 in the range of 100 mm to 500 mm in the vertically upward direction Gu side from the lower end 1011e. has been done. The inflow section lower baffle plate 1013 is arranged to be inclined so as to approach the bottom surface PB as it goes downstream. The angle formed by the inflow section baffle plate 1011 and the inflow section lower baffle plate 1013 is set to 50° to 80°. For this reason, it is possible to encourage the sedimented and separated suspended substances to slide down without being deposited on the surface of the inflow portion lower baffle plate 1013 on the Gu side in the vertically upward direction.
The length of the lower inflow baffle plate 1013 is up to the inclined plate 1020P disposed closest to the inflow baffle plate 1011. Specifically, the length of the lower inflow baffle plate 1013 is set until the horizontal position of the downstream end of the inflow part lower baffle plate 1013 matches the horizontal position of the lower end 1020j of the inclined plate 1020P. The length is set to .
As shown in FIGS. 7B and 7C, the inlet baffle plate 1011 is arranged so as to generally cover the inclined plate device 1010 in the horizontal direction. The position of the lower end 1011e of the inflow baffle plate 1011 in the vertical direction G is set below the lower end 1020j of the inclined plate 1020 of the inclined plate device 1010.

The inlet 1043 through which the water to be treated flows from the upstream space 1041 on the upstream side of the inflow baffle plate 1011 to the lower space 1042 of the inclined plate device 1010 is connected to the lower end 1011e of the inflow baffle plate 1011. It is formed between the bottom surface PB and the bottom surface PB.

In the configurations shown in FIGS. 7B and 7C, when the water to be treated flows from the upstream space 1041 to the lower space 1042, the cross section of the flow path through which the water flow passes rapidly narrows at the inlet 1043. Therefore, the flow velocity will increase.

On the other hand, in the solid-liquid separation system 100 of this embodiment as shown in FIG. 7A, the second surface is gradually reduced between the second surface 20b and the bottom surface PB of the sewage inclined plate 20P. 20b is provided so as to approach the bottom surface PB from the upstream space 41 toward the lower space 42, so that it is possible to suppress an increase in the speed of the water flow flowing into (sneaking into) the lower space 42. Furthermore, using CFD (computational fluid dynamics) analysis, it was confirmed that the effect of reducing the flow velocity could be obtained.

In addition, in the solid-liquid separation system 100 shown in FIG. 7A, the function of the inlet baffle plate 1011 shown in FIGS. 7B and 7C (to allow the horizontal flow that has flowed into the settling basin to flow into the lower part of the inclined plate device 1010) ), and by replacing the function of the inflow baffle plate with the sewage slope plate 20P of the front row of the slope plate device 10 (the first row closest to the inflow part 14 of the sedimentation basin), the inflow baffle is By shortening the vertical length of the flow plate 11, it is possible to secure a space below the inflow baffle plate 11 (see space Q in FIG. 7A, space Q' in FIG. 7B, and space Q' in FIG. 7C). .

As a result, in the solid-liquid separation system 100 of the present embodiment, the cross section of the flow path at the lower part of the inlet baffle plate 1011 suddenly contracts (the cross section of the flow path through which the water flow passes suddenly decreases) as shown in FIGS. 7B and 7C. By gradually decreasing the flow path cross section toward the lower space 42 of the inclined plate device 10 as shown in the inflow path 43, the lower space 42 of the inclined plate device 10 is prevented from narrowing. It becomes possible to suppress an increase in the speed of the flowing (submerging) water flow. Suppression of this increase in water flow velocity leads to equalization of the flow velocity distribution in the lower space 42 of the inclined plate device 10, and can advantageously enhance the conditions for sedimentation and separation of suspended solids.

Moreover, in the solid-liquid separation system 100 of the present embodiment, a water flow guide surface facing a part of the sewage slope plate 20 is provided from a position exceeding the water surface WS of the water to be treated to the bottom surface 10a of the slope plate device 10. It is being Note that the water flow guide surface faces the sewage slope plate 20 substantially in parallel.

In the first embodiment, the water flow guide surface also serves as the second surface 20b on the inflow section 14 side of the endmost sewage slope plate 20P arranged on the inflow section 14 side.

With this configuration, the inflow passage 43 can be formed using the surface of each component on the inflow part 14 side while keeping the space Q wide, so that the flow can be achieved with a simple configuration without increasing the number of parts. It is possible to reduce sudden narrowing of the road.
Further, in the solid-liquid separation system 100 of the present embodiment, the inflow baffle plate 11 and the inclined plate device 10 are separated and fixed to the final settling tank P separately. As a result, when vibrations are applied due to an earthquake or the like, the two do not affect each other, and therefore earthquake resistance can be improved.
Furthermore, in the solid-liquid separation system 100 of the present embodiment, the lower end 11e of the inflow baffle plate 11 is arranged above the upper end 20i of the sewage inclined plate 20P. Thereby, sudden contraction of the flow path below the inflow baffle plate 11 can be reduced.

Further, in the solid-liquid separation system 100 of the present embodiment, the upper end 20i of the sewage inclined plate 20P is arranged below the lower end 11e of the inflow baffle plate 11. In the configurations shown in FIGS. 7B and 7C, it is necessary to provide a separation distance d between the inflow baffle plate 1011 and the inclined plate device 1010 to avoid contact, but the configuration shown in FIG. 7A of this embodiment In this case, since the inflow baffle plate 11 is provided above the upstream end of the inclined plate device 10, there is no need to provide a separation distance, and the length between the inflow part 14 and the outflow part 15 can be shortened. be able to.
Further, in the solid-liquid separation system 100 of the present embodiment, the length of the sewage inclined plate 20P located at the end closest to the inlet baffle plate 11 is 100 to 2000 mm. The angle formed by the water flow guide surface (for example, the endmost sewage slope plate 20 disposed on the inlet side) and the horizontal direction D is 20° to 70°.

Thereby, the sludge that has settled on the sewage slope plate 20P that also serves as a water flow guide surface can be appropriately dropped onto the bottom surface of the settling basin.

(Embodiment 2)
A solid-liquid separation system according to Embodiment 2 of the present invention will be described.

<Configuration>
In the first embodiment, the second surface 20b of the sewage slope plate 20P at the end of the inflow section 14 side and the surface 11a of the inflow section baffle plate 11 on the inflow section 14 side serve as the water flow guide surface. In the solid-liquid separation system of the second embodiment, the water flow guide surface also serves only as a sewage slope plate.

FIG. 8 is a side view showing a partial configuration of a solid-liquid separation system 200 according to Embodiment 2 of the present invention.

As shown in FIG. 8, in the solid-liquid separation system 200 of the second embodiment, unlike the solid-liquid separation system 100 of the first embodiment, the water surface of the water to be treated W is By using the endmost sewage slope plate 220P having a length exceeding WS, the water W to be treated that has similarly flown in from the inflow portion 14 is guided to the lower space 42 of the slope plate device 210.

The endmost sewage slope plate 220P on the inflow portion 14 side of the slope plate device 210 is formed so that its upper end 220i extends to a position exceeding the water surface WS, compared to other sewage slope plates 20. Note that the surface of the sewage inclined plate 220P on the inflow portion 14 side is shown as a second surface 220b, and the surface on the opposite side to the second surface 220b is shown as a first surface 220a. The second surface 220b of the sewage slope plate 220P at the end of the inflow portion 14 side corresponds to an example of a water flow guide surface.

The lower end 220j of the sewage slope plate 220P may be set at approximately the same height as the lower end 20j of the other sewage slope plate 20. In FIG. 8, a virtual bottom surface 210a connecting the lower end 220j and the lower end 20j is shown as the bottom surface of the inclined plate device 210.

In addition, the surface lowered from the line where the sewage slope plate 220P and the water surface WS intersect to the bottom surface PB in the vertical direction G is S1, and the surface lowered from the lower end 220j of the sewage slope plate 220 to the bottom surface PB in the vertical direction G is S2. do. The space upstream from the surface S1 can be set as the upstream space 41, the space downstream from the surface S2 can be set as the lower space 42, and the space between the surfaces S1 and S2 can be set as the inflow path 43. can.

<Effects, etc.>
In the second embodiment, the water to be treated W flowing in from the inflow portion 14 flows through the upstream space 41, and its flow is blocked by the second surface 220b of the sewage slope plate 220P at the end and descends. The descended treated water W flows toward the bottom surface PB along the slope of the second surface 220b of the endmost sewage slope plate 220P, and flows into the lower space 42 below the slope plate device 210.

At this time, the sewage slope plate 220P is arranged at a position where it does not interfere with other components such as a scraper.
In the solid-liquid separation system 200 of the present embodiment, a water flow guide surface facing a part of the sewage slope plate 20 is provided from a position exceeding the water surface WS of the water to be treated to the bottom surface 210a of the slope plate device 210. There is. The water flow guide surface faces the sewage slope plate 20 substantially in parallel.

In the second embodiment, the water flow guide surface also serves as the second surface 220b on the inflow section 14 side of the endmost sewage slope plate 220P arranged on the inflow section 14 side.

With this configuration, the inflow path 43 can be formed using the surface of each component on the inflow section 14 side while maintaining a wide space for water to flow into the inflow path 43 from the upstream space 41. , sudden contraction of the flow path can be reduced with a simple configuration without increasing the number of parts.
Further, the angle formed by the water flow guide surface (for example, the endmost sewage slope plate 220P disposed on the inlet side) and the horizontal direction D is 20° to 70°.

Thereby, the sludge that has settled on the sewage slope plate 220P that also serves as a water flow guide surface can be appropriately dropped to the bottom of the settling basin.

(Embodiment 3)
A solid-liquid separation system according to Embodiment 3 of the present invention will be described.

<Configuration>
In the first embodiment, the second surface 20b of the sewage slope plate 20P at the end of the inflow section 14 side and the surface 11a of the inflow section baffle plate 11 on the inflow section 14 side serve as the water flow guide surface. In the solid-liquid separation system of Embodiment 3, the water flow guide surface also serves only as an inlet baffle plate.

FIG. 9 is a partial side view showing the configuration of the solid-liquid separation system 300 of this embodiment. The inflow baffle plate 311 of the solid-liquid separation system 300 includes a first portion 311a that is arranged substantially vertically, and an inclined portion 311b that is inclined so as to approach the bottom surface PB from the upstream space 41 toward the lower space 42. has. A surface 311d of the first portion 311a of the inflow baffle plate 311 on the inflow portion 14 side and a surface 311c of the bottom PB side (inflow portion 14 side) of the inclined portion 311b correspond to an example of a water flow guide surface. In FIG. 9, a virtual bottom surface 310a connecting the lower ends 20j is shown as the bottom surface of the inclined plate device 310.

Further, in the inclined plate device 310, the shapes of the upper frame 321, the lower frame 322, and the upper and lower frames 325 are changed compared to the inclined plate device 10 of the first embodiment so as not to interfere with the inclined portion 311b. Note that the inflow baffle plate 311 and the inclined plate device 310 are not mechanically connected. Because the configuration is not connected, the sewage slope plate 320 is less likely to receive direct energy from vibrations, so damage can be avoided.

Further, the surface from the first portion 311a of the inflow baffle plate 311 in the vertical direction G to the bottom surface PB is S1, and the surface from the lower end 311e of the inflow baffle plate 311 in the vertical direction G to the bottom surface PB is S2. shall be. The space upstream from the surface S1 can be set as the upstream space 41, the space downstream from the surface S2 can be set as the lower space 42, and the space between the surfaces S1 and S2 can be set as the inflow path 43. can.

In the third embodiment, the water to be treated W flowing in from the inflow section 14 flows through the upstream space 41, and its flow is blocked by the surface 311d of the inflow section baffle plate 311 and descends. The descended treated water W flows toward the bottom surface PB along the slope of the surface 311c of the inlet baffle plate 311, and flows into the lower space 42 below the inclined plate device 310.
<Effects, etc.>
In the solid-liquid separation system 300 of the third embodiment, a water flow guide surface facing a part of the sewage inclined plate 20 is provided from a position exceeding the water surface WS of the water to be treated W to the bottom surface 310a of the inclined plate device 310. ing. Note that the water flow guide surface faces the sewage slope plate 20 substantially in parallel. In the third embodiment, the water flow guide surfaces also serve as surfaces 311c and 311d of the inlet baffle plate 311 on the inlet 14 side.

With this configuration, the inflow path 43 can be formed using the surface of each component on the inflow section 14 side while maintaining a wide space for water to flow into the inflow path 43 from the upstream space 41. , sudden contraction of the flow path can be reduced with a simple configuration without increasing the number of parts.
Further, in the solid-liquid separation system 300 of the third embodiment, the inflow baffle plate 311 and the inclined plate device 310 are separated and fixed to the final settling tank P separately. As a result, when vibrations are applied due to an earthquake or the like, the two do not affect each other, and therefore earthquake resistance can be improved.

As described above, in the solid-liquid separation systems 100, 200, and 300 of the first to third embodiments, from the position exceeding the water surface WS of the water to be treated W to the bottom surface 10a, 210a, 310a of the inclined plate device 10, 210, 310, , a water flow guide surface facing a part of the sewage slope plate 20 is provided. Note that at least a portion of the water flow guide surface faces the sewage slope plate 20. Moreover, in this specification, "opposing" includes opposing via another member.

The specific configuration of the water flow guide surface is any one of the configurations listed below, as shown in the first to third embodiments above.
(1) The water flow guide surface serves as the second surface 20b of the sewage slope plate 20P at the end of the inflow section 14 side and the surface 11a of the inflow section baffle plate 11 on the inflow section 14 side.
(2) The water flow guide surface also serves as the second surface 220b on the inflow section 14 side of the endmost sewage slope plate 220P arranged on the inflow section 14 side.
(3) The water flow guide surface also serves as the surfaces 311c and 311d of the inflow section baffle plate 311 on the inflow section 14 side.

With this configuration, the inflow path 43 can be formed using the surface of each component on the inflow section 14 side while maintaining a wide space for water to flow into the inflow path 43 from the upstream space 41. , sudden contraction of the flow path can be reduced with a simple configuration without increasing the number of parts.
(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)
In the first to third embodiments described above, the water flow guide surface is formed on at least one of the sewage inclined plate 20P and the inflow baffle plate 11, but it is not limited to this, and the water flow guide surface is formed on the sewage inclined plate 20P and the inflow baffle plate 11. Separately from the baffle plate 211, a member on which a water flow guide surface is formed may be provided. This member may be supported together with the inlet baffle plate 11 or the inclined plate device 10, or may be supported on the wall surface Ps of the final settling tank P.

(B)
In the embodiment described above, the upper end 20i of the second surface 20b of the sewage inclined plate 20P, which is an example of a water flow guide surface, is arranged below the lower end 11e of the inflow baffle plate 11, but may also be placed on the upper side. However, the lower end 11e of the inflow baffle plate 11 is preferably located above the lower end 20j of the second surface 20b of the sewage inclined plate 20P.

(C)
In the above embodiment, the second surface 20b of the sewage slope plate 20P forming a part of the water flow guide surface, the surface 311c of the inlet baffle plate 311, or the surface 311c of the sewage slope plate 220P forming the water flow guide surface. Since the second surface 220b is formed of one plane, it is straight in a side view, but it is only necessary to approach the bottom surface PB from the upstream space 41 toward the lower space 42, and the second surface 220b is formed of a plurality of planes and is linear in a side view. It may be a polygonal line shape.

Further, the water flow guide surface is not limited to a flat surface, and may be formed entirely or partially as a curved surface.
(D)
Further, in the above embodiment, the inflow baffle plate 11 is arranged along the vertical direction G, but it is not limited to this. For example, the upper end may be located closer to the inflow part 14 than the lower end. It may be inclined to

(E)
The sewage slope plate 20 of the above embodiment may be divided into a plurality of slope plates along the width direction F. FIG. 10 is a perspective view showing a sewage slope plate 20' divided into a plurality of slope plates. The sewage slope plate 20' includes a plurality of slope plates 60 and a connecting member 61 disposed between adjacent slope plates 60. In the example shown in FIG. 10, three inclined plates 60 and two connecting members 61 are provided. The three inclined plates 60 are arranged side by side along the width direction F so that their main surfaces are located on the same plane. As shown in the enlarged view of the T section, the connecting member 61 is provided with an insertion portion 61a into which the end of each inclined plate 60 is inserted. By inserting the end of the inclined plate 60 into the insertion portion 61a, the sewage inclined plate 20' can be configured. Note that the connecting member 61 and the inclined plate 60 may be fixed by any method, but for example, it is possible to fix the connecting member 61 and the inclined plate 60 by penetrating the connecting member 61 and the inclined plate 60 with the end of the inclined plate 60 inserted into the insertion portion 61a. Just insert a pin etc.

(F)
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.

The solid-liquid separation system of the present invention exhibits the effect of suppressing imbalance in flow velocity distribution in the space below the inclined plate device, and is useful as a final settling tank of a sewage treatment facility.

10: Inclined plate device 11: Inlet baffle plate 20: Sewage inclined plate 20P: Sewage inclined plate 20b: Second surface 100: Solid-liquid separation system

Claims (3)

Sedimentation ponds used in sewage treatment plants,
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;
an inclined plate device having a plurality of inclined plates and disposed between the inflow part and the outflow part with a predetermined lower space opened from the bottom surface of the sedimentation basin;
a baffle plate disposed above the inclined plate device,
A water flow guide surface facing a part of the inclined plate is provided from a position above the water surface of the water to be treated to a bottom surface of the inclined plate device ,
The water flow guide surface also serves as a surface on the inflow part side of the endmost inclined plate and the baffle plate arranged on the inflow part side,
the baffle plate and the endmost inclined plate are separated;
Solid-liquid separation system. The length of the inclined portion of the water flow guide surface is 100 to 2000 mm, and the angle formed between the water flow guide surface and the horizontal direction is 20° to 70°.
The solid-liquid separation system according to claim 1 . a first support part that supports the inclined plate device on the sedimentation basin;
comprising at least one second support part that supports the baffle plate on the sedimentation basin;
The first support part and the second support part are separately fixed to a side wall of the sedimentation basin.
The solid-liquid separation system according to claim 1 .