JP2021087900A - Solid-liquid separation system - Google Patents

Abstract

To provide a solid-liquid separation system which can suppress curl-up of sludge.SOLUTION: A solid-liquid separation system 100 includes a final sedimentation basis P, an inflow part 14, an outflow part 15, an inclined plate device 10, a baffle 11 and a measuring instrument 18. The final sedimentation basis P is used in a sewage-treatment plant. The inflow part 14 flows-in treated water to the final sedimentation basis P. The outflow part 15 flows-out the treated water from the sedimentation basis. The inclined plate device 10 has a plurality of inclined plates 20 for sewage, the adjacent inclined plates 20 for sewage are arranged so as to face each other and be parallel with each other, and each of the inclined plates 20 for sewage is inclined so as to be positioned on the side of the inflow part 14 toward the upper part. The baffle 11 is arranged on the side of the inflow part 14 of the inclined plate device 10. The measuring instrument 18 is arranged between a bottom PB of the final sedimentation basis P and the inclined plate device 10, and measures sludge concentration.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solid-liquid separation system.

In the conventional sedimentation basin with water treatment specifications, a plurality of inclined plates are used to improve the sedimentation area, and the inclined plates generate flocs (aggregates in which fine particles collide to form larger aggregates). A system was developed to deposit and purify water.

These technologies have been diverted to sewage treatment. As a background to this, in recent years, sewage treatment plants have been required to upgrade existing facilities from the viewpoint of reducing the environmental load, and along with this, the final settling basin. There is a need to increase the capacity of the sewage system.

According to "Sewerage Facility Planning / Design Guidelines and Explanations-2009 Edition-" (Japan Sewerage Association), the treatment capacity of the final settling basin is determined by the amount of inflow water per day (water area load) with respect to the settling area of sludge. Be done. The sludge settling area is the area of the portion that finally captures the sludge, and corresponds to the area of the bottom surface of the final settling basin where the settled sludge arrives, usually the area of the final settling basin itself.

Therefore, if a larger final settling basin is newly constructed, the effect on the quality of treated water will be smaller even if the amount of inflow water increases due to the effects of time fluctuations and daily fluctuations. Therefore, it is usually designed for the maximum daily water volume, so if the facility is designed for the peak water volume due to inflow fluctuation, there is a problem that excessive capital investment is required. Therefore, in order to improve the efficiency of the existing final settling basin, a technique using an inclined plate that improves the processing capacity with a small capital investment has been proposed (see Patent Document 1).

In the final settling basin in which the inclined plate device is introduced as a measure against the water load as shown in Patent Document 1, the amount of sludge flowing in increases, and the sludge is captured by the inclined plate device and the sludge on the inclined plate slides down. It is expected that it will be deposited on the bottom of the pond.

The sludge interface that collects on the bottom of such a pond was managed manually. Specifically, a rod-shaped member was inserted toward the bottom of the pond, and the position where sludge was attached to the member was visually recognized to control the amount of sludge accumulated in the pond. The accumulated sludge is removed by regular sludge withdrawal.

On the other hand, there is disclosed a technique of detecting sludge accumulated on the bottom of a pond with a sensor and automatically controlling a sludge scraper without using manual sludge management (see, for example, Patent Document 2).

Japanese Patent No. 6182190 Japanese Unexamined Patent Publication No. 8-84902

The inclined plate device for sewage shown in Patent Document 1 is an upward flow type, and the flow velocity in the lower part of the blocking plate is increased by installing the blocking plate in the inflow portion. Further, since the flow velocity of the front stage of the inclined plate device is faster than that of the rear stage, it is considered that the amount of water flowing into the inclined plate in the vicinity of the blocking plate increases and the amount of sludge deposited on the bottom of the pond increases locally. At such a position where the amount of sludge deposited locally increases, there is a concern that sludge may be rolled up because the flow velocity is high.

For example, in the technique shown in Patent Document 2, a blocking plate is not provided, and the inclined plate is arranged so as not to face the flow of flowing water (that is, as the inclined plate moves upward, it moves toward the outflow portion side. Since it is tilted so that it is located), it is unlikely that a local increase in flow velocity will occur.

Therefore, in the technique shown in Patent Document 2, it is not necessary to consider a local increase in flow velocity and an increase in sludge amount, and there is also a problem of sludge rolling up in a place where the flow velocity is locally high when the sludge interface rises. Not happening. Therefore, it is not known that the problem arises in the structure of the invention of the present application, and it can be said that the present application confirms the problem for the first time.

An object of the present invention is to provide a solid-liquid separation system capable of suppressing the rolling up of sludge.

In order to achieve the above object, the solid-liquid separation system according to the first invention includes a settling basin, an inflow portion, an outflow portion, an inclined plate device, a flow blocking plate, and a measuring instrument. The settling basin is used for sewage treatment plants. In the inflow section, the water to be treated flows into the settling basin. In the outflow part, treated water flows out from the sedimentation basin. The tilt plate device has a plurality of tilt plates, and adjacent tilt plates are arranged so as to face each other and parallel to each other, and each tilt plate is tilted so as to be located on the inflow portion side as it goes upward. There is. The blocking plate is arranged on the inflow portion side of the inclined plate device. The measuring instrument is placed between the bottom of the settling basin and the ramp plate device to measure the sludge concentration.

By providing the blocking plate and the inclined plate in this way, a local increase in the flow velocity and a local increase in the amount of sludge occur. It is possible to detect an increase in the amount of sludge and suppress the roll-up of sludge.

The solid-liquid separation system according to the second invention is the solid-liquid separation system according to the first invention, and the measuring instrument has a distance of 100 to 1000 mm from the lower end of the inclined plate toward the bottom of the settling basin. It is attached to the tilt plate device so that it can be adjusted with.

As a result, the measuring instrument can be adjusted to an appropriate position, and sludge can be suppressed from rolling up.

The solid-liquid separation system according to the third invention is the solid-liquid separation system of the first or second invention, and includes a notification device and a control unit. The notification device issues an alarm. The control unit operates the notification device when the measuring instrument detects a sludge concentration of 1000 mg / L or more.

This makes it possible to notify the administrator of the solid-liquid separation system, and the administrator can operate a sludge scraper or increase the amount of sludge drawn out to suppress sludge from rolling up.

The solid-liquid separation system according to the fourth invention is the solid-liquid separation system of the first or second invention, and includes a drawing unit and a control unit. The pull-out part pulls out sludge. The control unit increases the amount of sludge extracted by the extraction unit when the measuring instrument detects a sludge concentration of 1000 mg / L or more.

As a result, by automatically increasing the amount of sludge drawn out, the sludge pool MP described later can be flattened, and the sludge can be suppressed from rolling up.

The solid-liquid separation system according to the fifth invention is the solid-liquid separation system according to any one of the first to fourth inventions, and the measuring instrument is arranged in the vicinity of the blocking plate.

As a result, the measuring instrument can be arranged at a position where the flow velocity is increased by the blocking plate, and the sludge can be suppressed from being rolled up.

According to the present invention, it is possible to provide a solid-liquid separation system capable of suppressing the rolling up of sludge.

The side view which shows the solid-liquid separation system in embodiment which concerns on this invention. The perspective view which shows typically the structure of the inclined plate apparatus of the solid-liquid separation system of FIG. The side view which shows typically the inclined plate apparatus of FIG. A front view of the arrangement of the inclined plate device of FIG. 2 as viewed along the direction of arrow D. (A) A plan view showing the second surface side of the sewage inclined plate of FIG. 3, and (b) a plan view showing the first surface side of the sewage inclined plate of FIG. The figure which shows an example of the structure of the attachment part of FIG. The figure which shows an example of the structure of the attachment part of FIG. A side view showing a state in which the amount of sludge accumulation is locally increasing. The perspective view which shows the inclined plate in the modification of embodiment which concerns on this invention.

Hereinafter, the solid-liquid separation system according to the embodiment of the present invention will be described in detail with reference to the drawings.

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

As shown in FIG. 1, the solid-liquid separation system 100 includes a final settling basin P (an example of a settling basin), an inclined plate device 10, a diversion plate 11, an overflow weir 12, a water channel 13, and an inflow portion. 14, the outflow unit 15, the sludge scraper 16, the sludge hopper 17, the measuring instrument 18, the mounting unit 19, the sludge extraction unit 71, the notification device 72 including the notification means, the control unit 73, and so on. To be equipped.

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

The inclined plate device 10 is arranged on the downstream side (outflow portion 15 side) from the substantially central portion of the final settling basin P. The tilt plate device 10 has a plurality of tilt plates 20 for sewage. 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 tilted toward the inflow portion 14.

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 secure a predetermined space between the inclined plate device 10 and the bottom surface PB of the final settling basin P. This support may be suspended from a girder or the like, or may be placed on a support (not shown), for example. The details of the inclined plate device 10 will be described in detail later.

The blocking plate 11 is provided on the upstream side (inflow portion 14 side) of the inclined plate device 10 and at a substantially central portion of the final settling basin P. The blocking plate 11 is a plate-shaped member that is configured separately from the sewage inclined plate 20. The flow blocking plate 11 blocks the flow of the water to be treated W to the downstream side (outflow portion 15 side) in the region from the water surface to a predetermined depth. The blocking plate 11 is arranged so that the main surface is substantially perpendicular to the direction of the water flow flowing in 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 (outflow portion 15 side) of the flow blocking plate 11. The overflow weir 12 is formed along the direction from the upstream side to the downstream side.

The waterway (trough) 13 is formed by being surrounded by the overflow weir 12 and is connected to the outflow portion 15. The overflow weir 12 is not limited to the overflow weir 12, and a hole may be formed in the pipe.

The water W to be treated that has flowed into the final settling basin P from the inflow portion 14 is blocked by the blocking plate 11 in the water flow direction (arrow D direction (an example of a predetermined direction)), and finally settles with the lower end 11e of the blocking plate 11. It descends toward the part between the bottom surface PB of the pond P. The water W to be treated that has passed between the bottom surface PB of the final settling basin P and the lower end 11e of the blocking plate 11 becomes an upward flow J toward the water channel 13, and the inclined plate 20 for sewage from the lower portion 10a of the inclined plate device 10 Inflows and rises during.

Then, the sludge of the water to be treated W collides with the second surface 20b and is trapped while passing through the inclined plate device 10, or is settled and settled on the first surface 20a of the inclined plate 20 for sewage. The water to be treated W is purified. The sludge settled on the first surface 20a of the sewage inclined plate 20 falls by its own weight as it is deposited.

The sludge scraper 16 is arranged near the bottom surface of the final settling basin P. Sedimented sludge M is deposited near the bottom surface of the final settling basin P. The accumulated sludge M is collected in the sludge hopper 17 by the sludge scraper 16 rotating clockwise in FIG. 1, and is discharged. The sludge scraper 16 passes near the water surface on the upstream side of the blocking plate 11 and also scrapes suspended matter.

The sludge hopper 17 is formed on the bottom surface of the final settling basin P near the inflow portion 14.
The measuring instrument 18 measures the sludge concentration. The measuring instrument 18 is arranged between the inclined plate device 10 and the bottom PB of the final settling basin P.

The mounting portion 19 mounts the measuring instrument 18 on the inclined plate device 10. The mounting position of the inclined plate device 10 is arranged at a position where the sludge collecting portion MP described later is likely to occur. As a specific example, the inclined plate device 10 is arranged between the end position on the inflow portion side and the intermediate position, but the arrangement position can be optimized depending on the size of the settling basin.

The sludge extraction unit 71 draws sludge from the sludge hopper 17 to the outside of the final settling basin P. The notification device 72 notifies the manager of the final settling basin P based on the sludge concentration detected by the measuring instrument 18. Specifically, it issues an alarm.

The control unit 73 increases the amount of sludge extracted by the pump of the sludge extraction unit 71 based on the sludge concentration measured by the measuring instrument 18. The control unit 73 operates the notification device 72 to perform notification based on the sludge concentration measured by the measuring instrument 18. Specifically, the notification device 72 issues an alarm.

(Inclination plate device 10)
FIG. 2 is a perspective view schematically showing a part of the configuration of the inclined plate device 10. FIG. 3 is a side view showing the inclined plate device 10 and the blocking plate 11. FIG. 4 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. 5A is a plan view showing the second surface 20b side of the sewage inclined plate 20. FIG. 5B is a plan view showing the first surface 20a side of the sewage inclined plate 20.

As shown in FIG. 2, the inclined plate device 10 includes a plurality of inclined plates 20 for sewage, a pair of upper frames 21, a pair of lower frames 22, a plurality of support rods 23, a plurality of hooks 24, and the like. have.

The pair of upper frames 21 are arranged along a direction D (an example of a predetermined direction) from the inflow portion 14 to the outflow portion 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 portion 14 to the outflow portion 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 erected in parallel between the pair of upper frames 21 and parallel to each other between the pair of lower frames 22.

The sewage inclination plate 20 is attached to a pair of upper and lower support rods 23 so as to be inclined with respect to the pair of upper frames 21 and the pair of lower frames 22.

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

The upper frame 21 is supported by a hanging bolt 31 from above, and the hanging bolt 31 is fixed to a girder member 32 arranged along the width direction F. The girder 32 is fixed to the opposite wall surface Ps of the final settling basin P. Further, a plurality of girder 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 from the water surface of the water to be treated W to a predetermined depth and to secure a predetermined space between the inclined plate device 10 and the bottom surface PB of the final settling basin P. There is.

The length of the blocking plate 11 in the width direction is substantially the same as the width direction F of the final settling basin P. Further, in the vertical direction G, the position of the lower end 11e of the blocking plate 11 is preferably equal to or less than the position of the lower end 20j of the sewage inclined plate 20. As shown in FIG. 3, the flow blocking plate 11 is supported by a hanging bolt 33, and the hanging bolt 31 is fixed to a girder member 32 arranged along the width direction F.

(Sewage tilt plate 20)
The sewage inclined plate 20 is formed of a substantially square member. Hard vinyl chloride is preferable as the material of the inclined plate 20 for sewage, but the material is not limited to this. The material of the inclined plate is, for example, a thermoplastic resin, for example, a vinyl resin such as polyvinyl chloride, a carbonate resin such as polycarbonate, an ester resin such as polyethylene terephthalate, an acrylic resin such as polymethyl methacrylate, polypropylene, polyethylene, etc. It may be an olefin resin, a styrene resin such as ABS, a copolymer or a mixed resin thereof, or a thermosetting resin such as an epoxy resin or an unsaturated polyester resin, and may be a metal, ceramic, or the like. It may be wood, rubber, or the like.

A plurality of inclined plates 20 for sewage are arranged side by side 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 settling basin P of the sewage treatment plant with the lower frame 22 facing the bottom surface PB side of the final settling basin P. The second surface 20b (described later) of the sewage inclined plate 20 is directed toward the bottom surface PB side of the final settling basin P.

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

When the sewage inclined plate 20 is attached to the pair of upper frames 21, the pair of lower frames 22, and the support rods 23 described above, the upper end portion 20i and the lower end portion 20j are supported 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 portion 20c and the second end portion 20d are arranged so as to be inclined from the upper frame 21 toward the lower frame 22.

The plurality of inclined plates 20 for sewage are arranged side by side along the direction D in which the water to be treated flows from the inflow portion 14 into the final settling basin P. The plurality of sewage slope plates 20 are arranged so 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 the first surface 20a of one of the adjacent sewage inclined plates 20 and the other sewage inclined plate 20. The second surface 20b of the above is arranged so as to face each other. Further, the positions of the lower end portions 20j of the plurality of sewage inclined plates 20 in the vertical direction G are substantially the same.

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

Further, in the side view, the angle θa formed by the sewage inclined plate 20 and the arrow D direction (corresponding to the horizontal direction in the present embodiment) is preferably 10 degrees or more and 70 degrees or less, and 60 degrees is particularly preferable. The angle θb formed by the sewage inclined plate 20 and the vertical direction G is preferably set to 20 degrees or more and 80 degrees or less, and particularly preferably 30 degrees. Within this range, the effective sedimentation area of the solid-liquid separation system can be secured.

Sludge trapping treatment is performed on the second surface 20b of the sewage inclined plate 20 shown in FIG. 5 (a). Here, the sludge trapping treatment is a treatment for making the second surface 20b of the sewage inclined plate 20 in a state where sludge easily stays so that the sludge in the water to be treated does not flow out from the final settling basin P. For example, by increasing the roughness of the surface of the inclined plate and forming unevenness in the direction along the movement of the sludge along the surface or in the direction orthogonal to the surface, the sludge easily adheres to the surface of the inclined plate. It can, but is not limited to. The method for roughening the surface is not particularly limited, but it may be mechanically processed by, for example, sandblasting, or it may be finely etched with a predetermined chemical or a mold with a predetermined surface roughness. It may be press working or the like. Further, the capture process may not be applied to the entire second surface 20b.

The first surface 20a on the opposite side of the second surface 20b is preferably a flat surface so that sludge can easily slide down.

The inclined plate 20 for sewage can be produced by deformed extrusion molding, injection molding, or the like, but extrusion molding is preferable.

Further, a groove portion 20e is provided on the second surface 20b of the sewage inclined plate 20 along each of the first end portion 20c and the second end portion 20d. A hook hole 20eb is formed in the groove portion 20e, and the hook 24 described above is mounted in the hook hole 20eb. The sewage inclined plate 20 is attached to the support rod 23 of the inclined plate device 10 by the hook 24 attached to the hook hole 20 eb. Further, a ridge portion 20f facing the groove portion 20e is formed on the first surface 20a.

(Measuring instrument 18)
The measuring instrument 18 measures the sludge concentration. The measuring instrument 18 is attached to the inclined plate device 10 by the mounting portion 19, and is arranged between the inclined plate device 10 and the bottom surface PB.

As the measuring instrument 18, for example, an SS (Suspended Solids) meter or a turbidity meter can be used.

In the present embodiment, the measuring instrument 18 is arranged in the vicinity of the lower end 11e of the blocking plate 11 as shown in FIG. More specifically, in the inclined plate device 10, the inclined plate device 10 is arranged so as to overlap (superimpose) with the inclined plate 20 for sewage which is arranged on the most side of the blocking plate 11 in a plan view. Further, it can be said that the measuring instrument 18 is arranged between the lower end portion 20j of the sewage inclined plate 20 arranged closest to the blocking plate 11 and the blocking plate 11 in the direction of arrow D.

In the present embodiment, the measuring instrument 18 is arranged at the position shown in FIG. 3 as an example of the position where the sludge accumulated on the pond bottom PB is likely to be rolled up. For example, the position is not limited to the positions shown in FIGS. 1 and 3.

(Mounting part 19)
The mounting portion 19 mounts the measuring instrument 18 on the inclined plate device 10. The mounting portion 19 has, for example, a hanging attachment 41 and a hanging metal fitting 42, as shown in FIG. The hanging attachment 41 is attached to the measuring instrument 18. The measuring instrument 18 has, for example, a cylindrical shape. The hanging attachment 41 has a cylindrical shape, and a measuring instrument 18 is inserted therein. The hanging metal fitting 42 is connected to the hanging attachment 41.

The hanging metal fitting 42 has a chain 42a, and the chain 42a is fixed to the lower frame 22 (not shown). The chain 42a can be fixed to the lower frame 22 by, for example, a wire or the like. By changing the length of the hanging metal fitting 42 from the lower frame 22, the position of the measuring instrument 18 from the lower frame 22 can be changed.

As shown in FIG. 3, assuming that the distance in the vertical direction G from the lower end 20j of the sewage inclined plate 20 to the measuring instrument 18 is H, the hanging metal fitting 42 is adjusted so that H can be adjusted between 100 and 1000 mm. The length of is provided. The hanging metal fitting 42 functions as an adjusting mechanism for adjusting the position of the sewage inclined plate 20 of the measuring instrument 18 from the lower end portion 20j.

FIG. 7 is a diagram showing another example of the mounting portion 19, in which the mounting portion 19 has a rod-shaped member 51, a pedestal 52, two fixing members 53, and two fixing members 54. The rod-shaped member 51 is arranged along the vertical direction G. The rod-shaped member 51 is fixed to the lower frame 22 (not shown). The rod-shaped member 51 can be fixed to the lower frame 22 by welding, bolts, wires, or the like. The gantry 52 is fixed to the rod-shaped member 51 by two fixing members 53. The measuring instrument 18 is fixed to the gantry 52 by two fixing members 54.

The two fixing members 53 are U-shaped when viewed along the vertical direction. Each fixing member 53 is arranged so as to surround the rod-shaped member 51, and both ends thereof penetrate the gantry 52.

Further, screw shapes are formed at both ends of the fixing member 53, and bolts 55 are fitted. By tightening the bolt 55, the gantry 52 and the fixing member 53 sandwich the rod-shaped member 51, so that the position of the gantry 52 with respect to the rod-shaped member 51 can be fixed.

Further, the distance H from the lower end portion 20j of the sewage inclined plate 20 to the measuring instrument 18 can be adjusted by loosening the bolt 55 and moving the gantry 52 up or down in the vertical direction G (see the arrow). it can. In this way, the gantry 52, the fixing member 53, and the bolt 55 function as an adjusting mechanism.

The two fixing members 54 are U-shaped when viewed from the side. Each fixing member 54 is arranged so as to surround the measuring instrument 18, and both ends thereof penetrate the gantry 52. The fixing member 54 is provided on the surface of the gantry 52 opposite to the fixing member 53. Screw shapes are formed at both ends of the U-shape of the fixing member 54, and bolts 56 are fitted. By tightening the bolt 56, the gantry 52 and the fixing member 54 sandwich the measuring instrument 18, and the measuring instrument 18 can be fixed to the gantry 52.

(Sludge extraction part 71)
As shown in FIG. 1, the sludge drawing unit 71 pulls out sludge from the sludge hopper 17 to the outside of the final settling basin P. Some of the extracted sludge is returned to the aeration tank as, for example, return sludge, and the other surplus sludge is carried out via a mechanical concentrator, a sludge digestion tank, and the like.

The sludge extraction unit 71 has a extraction pipe 71a, a valve 71b, and a pump 71c. The pull-out pipe 71a is connected to the sludge hopper 17. The valve 71b opens and closes the pull-out pipe 71a. Sludge is pulled out through the pull-out pipe 71a by driving the pump 71c.

(Notification device 72)
The notification device 72 notifies the administrator based on the sludge concentration measured by the measuring instrument 18. The manager can check the on-site situation by listening to the notification information (alarm).

The notification device 72 can use a speaker, a monitor, or the like, and may be vibration or the like, not limited to sound or light. In short, it is sufficient that the administrator can be notified that the sludge concentration has reached a predetermined threshold value.

When the notification device 72 is remotely monitored, it may be installed in the monitoring facility or may be installed in the vicinity of the final settling basin P.

(Control unit 73)
The control unit 73 has a processing unit such as a CPU (Central Processing Unit) and a main memory including a non-volatile memory such as a ROM (Read Only Memory) and a volatile memory such as a RAM (Random Access Memory). .. The control unit 73 reads the program stored in the main memory and executes a predetermined process according to the program. Memory is an example of a recording medium that can be read by a non-transitory computer. The program may be distributed to the control unit 73 via the network.

The control unit 73 stores a predetermined threshold value. The predetermined threshold value can be set to, for example, 1000 mg / L, and the control unit 73 drives the notification device 72 to notify the administrator when the measured value of the measuring instrument 18 becomes 1000 mg / L or more, and notifies the administrator of the valve 71b and the pump 71c. Drives to increase the amount of sludge extracted.

<Operation>
The operation of the solid-liquid separation system 100 of the present embodiment will be described.

As described above, the water W to be treated that has flowed into the final settling basin P from the inflow portion 14 is blocked by the blocking plate 11 in the water flow direction (arrow D direction), and the lower end 11e of the blocking plate 11 and the final settling basin. It descends toward the portion of P between it and the bottom surface PB. At this time, since the area through which the water to be treated W passes is reduced by the blocking plate 11, the flow velocity is increased.

The water W to be treated that has passed between the bottom PB of the final settling basin P and the lower end 11e of the blocking plate 11 becomes an upward flow J toward the water channel 13, and the inclined plate for sewage from the lower portion 10a of the inclined plate device 10 It flows in during 20 and rises.

The sludge of the water to be treated W that has flowed into the inclined plate 20 for sewage collides with the second surface 20b and is trapped or settled while passing through the inclined plate device 10, and settles on the first surface 20a. .. The sludge that has settled on the first surface 20a of the sewage inclined plate 20 falls under its own weight as it is deposited, and is deposited on the bottom surface PB.

Here, the flow blocking plate 11 increases the flow velocity in the front stage portion (near the blocking plate 11) of the inclined plate device 10, but the flow velocity becomes slower in the rear stage portion (outflow portion 15 side) of the inclined plate device 10 and further sewage. Since the inclined plate 20 acts as a resistor, the amount of water flowing between the inclined plates 20 for sewage in the front stage portion is larger than that in the rear stage portion.

Therefore, as shown in the schematic view of FIG. 8, sludge M is more likely to accumulate below the front stage of the inclined plate device 10 than other portions (see sludge collecting portion MP). Further, since the flow velocity becomes high in this portion, the sludge M is likely to be rolled up.

Then, when the value detected by the measuring instrument 18 reaches 1000 mg / L, the control unit 73 determines that the sludge M has been wound up, operates the notification device 72, and controls the sludge extraction unit 71 to control the sludge. Increase the amount of pulling out.

As described above, in the present embodiment, by arranging the measuring instrument 18 above the portion where sludge is likely to accumulate, it is possible to suppress the hoisting of sludge.

<Other embodiments>
Although the embodiment according to the present invention has been described above, the present invention is not limited to the above-described embodiment and can be appropriately modified without departing from the spirit of the present invention.

(A)
In the above embodiment, when the measured value of the measuring instrument 18 reaches a predetermined threshold value, the sludge extraction amount by the sludge extraction unit 71 is increased, but the sludge extraction unit 71 does not have to be controlled and is notified. Only the device 72 may be operated.

(B)
The solid-liquid separation system 100 of the above embodiment is provided with the notification device 72, but the notification is not limited to the notification, and the administrator may be notified that a predetermined threshold value has been reached. Further, a plurality of threshold values are set, and the administrator may be notified step by step.

Further, the measured value by the measuring instrument 18 may be appropriately displayed on a monitor that can be seen by the administrator.

(C)
The sewage inclined plate 20 of the above-described embodiment may be divided into a plurality of inclined plates along the width direction F. FIG. 9 is a perspective view showing a sewage inclined plate 20'divided into a plurality of inclined plates. The sewage inclined plate 20'has a plurality of inclined plates 60 and a connecting member 61 arranged between adjacent inclined plates 60. In the example shown in FIG. 9, 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 the main surfaces are located on the same surface.

As shown in the enlarged view of the T portion, 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 inclined plate 20'for sewage can be formed. Any method may be used for fixing between the connecting member 61 and the inclined plate 60, but for example, the connecting member 61 and the inclined plate 60 are penetrated with the end of the inclined plate 60 inserted into the insertion portion 61a. Just insert a pin or the like into.

(D)
In the above embodiment, the sewage inclined plate 20 is supported by the support rod 23 by the hook 24, but the hook is not limited to the hook 24, and a plurality of sewage inclined plates 20 can be arranged side by side. For example, the support method is not limited.

(E)
In the above embodiment, the measuring instrument 18 is supported by the lower frame 22, but the present invention is not limited to this, and the measuring instrument 18 may be fixed to the lower end of the blocking plate 11 or the wall surface of the final settling basin P. It may be supported by a support for Ps (see FIG. 4).

(F)
In the above embodiment, the control unit 73 and the notification device 72 are described separately, but the control unit 73 may be incorporated in the housing of the notification device 72.

The solid-liquid separation system of the present invention exerts an effect capable of suppressing the roll-up of sludge, and is useful as a final settling basin of a sewage treatment facility.

10: Inclined plate device 11: Blocking plate 14: Inflow unit 15: Outflow unit 18: Measuring instrument 20: Sewage inclined plate

Claims (5)

Settling basin used for sewage treatment plant and
The inflow part where the water to be treated flows into the sedimentation basin and
The outflow part where the treated water flows out from the sedimentation basin and
It has a plurality of inclined plates, and the adjacent inclined plates are arranged so as to face each other and parallel to each other, and each of the inclined plates is inclined so as to be located on the inflow portion side as it goes upward. Board device and
A blocking plate arranged on the inflow portion side of the inclined plate device, and
A measuring instrument, which is arranged between the bottom of the sedimentation basin and the inclined plate device and measures the sludge concentration, is provided.
Solid-liquid separation system. The measuring instrument is attached to the inclined plate device so that the distance from the lower end of the inclined plate toward the bottom of the sedimentation basin can be adjusted between 100 and 1000 mm.
The solid-liquid separation system according to claim 1. Notification device and
A control unit that operates the notification device when the measuring instrument detects a sludge concentration of 1000 mg / L or more is further provided.
The solid-liquid separation system according to claim 1 or 2. A pull-out part that pulls out sludge,
Further provided with a control unit that increases the amount of sludge extracted by the extraction unit when the measuring instrument detects a sludge concentration of 1000 mg / L or more.
The solid-liquid separation system according to claim 1 or 2. The measuring instrument is arranged in the vicinity of the blocking plate.
The solid-liquid separation system according to any one of claims 1 to 4.

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