JP6763587B1 - Inclined plate sedimentation separation system and its purification method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently clean an inclined plate in a lateral flow type inclined plate settling separation system without lowering the treatment efficiency of water to be treated and without causing an increase in the size of the entire system. Provided is an inclined plate settling separation system and a purification method for the system. SOLUTION: The inclination direction of the inclined plate 11 of the inclined plate assembly of at least two stages from the bottom of an inclined plate settling device 10 provided with a plurality of inclined plate aggregates composed of several inclined plates 11 in the vertical direction is the same. , A washing water supply pipe 21 having nozzles 22 arranged at intervals between the inclined plates 11 is arranged below the inclined plate settling device 10, and the washing water supply pipe 21 is injected while injecting washing water from the nozzle 22. By moving along the gap between the inclined plates 11, the flocs adhering to the inclined plates 11 are washed and removed. [Selection diagram] Fig. 1

Description

The present invention relates to an inclined plate settling separation system in which an inclined plate settling device is suspended in a settling tank to perform water treatment, and in particular, an inclined plate settling separation system provided with a cleaning device for removing flocs adhering to the inclined plate and the same. Regarding purification method.

Conventionally, in water purification plants and the like, as a means for efficiently separating such turbid components from water containing turbid components such as minute gravel and organic substances derived from animals and plants and microorganisms, a flocculant is added to the water to make the turbidity. A method is known in which the components are flocculated, and the flocs are sedimented and separated using an inclined plate sedimentation separation system and deposited as sludge on the bottom of the sedimentation tank. In the inclined plate settling separation system, a tilted plate settling device having an aggregate in which a plurality of inclined plates whose main surfaces are inclined in the vertical direction are arranged in parallel and integrated is suspended in a settling tank and inclined. By flowing the water to be treated through the gap between the plates, the flocs settle on the upper surface side of the inclined plate and are removed while the water to be treated passes through the gap. The inclined plate subsidence separation system includes an upward flow type in which the inclined plates are arranged so that the arrangement direction of the inclined plates is parallel to the flowing direction of the water to be treated, and an arrangement direction of the inclined plates is in the flowing direction of the water to be treated. There is a lateral flow type in which inclined plates are arranged so as to be orthogonal to each other. In the upward flow type, the water to be treated is flowed below the inclined plate settling device, and while the water to be treated passes through the gap of the inclined plate from the lower side to the upper side, the flocs contained in the water to be treated are generated. It sinks to the inclined upper surface of the inclined plate. Further, in the lateral flow type, the water to be treated flows from the side of the inclined plate toward the gap between the inclined plates, and the water to be treated flows while the water to be treated flows through the gap between the inclined plates toward the outflow side. The flocs contained in the above settle on the upper surface of the inclined plate. In each case, most of the flocs that have settled on the upper surface of the inclined plate move downward along the upper surface and accumulate as sludge on the bottom of the settling tank below the inclined plate settling device, but some of them are on the inclined plate. Since it adheres to the water, the gap between the inclined plates becomes narrower with time, and the treatment efficiency of the water to be treated is lowered. Therefore, it was necessary to perform cleaning work to remove the flocs adhering to the inclined plate on a regular basis.

As a device for cleaning the inclined plate, as described in Patent Document 1, there is known a device that injects cleaning water from a water ejection nozzle toward the inclined plate and pushes the flocs on the inclined plate downward. Since the apparatus disclosed in Patent Document 1 is an upward flow type inclined plate settling separation system, an aggregate in which a plurality of inclined plates are arranged in parallel is not stacked in multiple stages in the vertical direction and is used in one stage. It is possible to arrange a nozzle and a supply pipe for supplying cleaning water to the inclined plate above the inclined plate settling device, and inject cleaning water toward the inclined plate from above to clean the entire upper surface of the inclined plate. is there.

However, in the lateral flow type inclined plate settling separation system, in order to prevent the flocs that have settled on the inclined plate from flying up during the treatment and reducing the efficiency of water treatment, a set of a plurality of inclined plates arranged in parallel. It is common to stack the bodies in multiple stages in the vertical direction and to stack the inclined plates so that the inclined directions are staggered in the vertical direction. Therefore, even if the washing water is sprayed from above or below the inclined plate settling device, the one-stage inclined plate above or below can be washed, but the inclined plates after the second stage from above or below are washed. Hateful. Therefore, as disclosed in Patent Documents 2 and 3, as a method for cleaning the inclined plate of the lateral flow type inclined plate sedimentation separation system, a method of injecting cleaning water from the side of the inclined plate sedimentation device is adopted. Was there.

Japanese Unexamined Patent Publication No. 52-135461 Japanese Unexamined Patent Publication No. 52-82862 JP-A-59-73010

In the lateral jet type, the gap between the inclined plates has a zigzag shape in the vertical direction. Therefore, in order to clean the entire inclined plate, a discharge pipe provided with a plurality of nozzles is provided as disclosed in Patent Document 2. It is necessary to take measures such as adjusting the injection position by raising and lowering the jet, or moving the jet generator in the vertical direction and the horizontal direction as disclosed in Patent Document 3, both of which are easy to control. It wasn't.

Further, in the lateral flow type, when a plurality of inclined plate aggregates are arranged in the flow direction of the water to be treated to lengthen the length in the horizontal direction in which the water to be treated contacts the inclined plate, the side of the inclined plate There is also a problem that even if the washing water is sprayed from one side, the inclined plate in the central part cannot be sufficiently washed. Therefore, it is necessary to provide a gap for arranging the cleaning device in the middle of the multi-stage inclined plate aggregate arranged in the flowing direction of the water to be treated, and the entire system becomes large. There was a problem that it decreased.

An object of the present invention is to efficiently clean the inclined plate in a lateral flow type inclined plate settling separation system without lowering the treatment efficiency of the water to be treated and without causing an increase in the size of the entire system. It is an object of the present invention to provide an inclined plate settling separation system equipped with a capable cleaning device and a method for purifying the system.

The first aspect of the present invention is to have at least two inclined plate assemblies in the vertical direction, which are composed of a plurality of inclined plates whose inclined surfaces are arranged parallel to each other, and are suspended in a settling tank. An inclined plate settling separation system including a plate settling device and the inclined plate cleaning device.
In the inclined plate settling device, the inclined plate of the inclined plate assembly having at least two stages from the bottom has the same inclined direction.
The cleaning device is arranged below the inclined plate settling device, and moves a cleaning water supply pipe having a plurality of nozzles having injection ports directed to gaps between the inclined plates of the inclined plate assembly and the cleaning water supply pipe. The inclined plate settling separation system is provided with a driving means and a washing water supply means for supplying washing water to the washing water supply pipe.

The inclined plate sedimentation separation system of the present invention includes the following configurations as preferred embodiments.

(1) The washing water supply pipe is arranged parallel to the arrangement direction of the inclined plates, the nozzles are arranged in the washing water supply pipe along the arrangement direction for each gap of the inclined plates, and the driving means The wash water supply pipe is moved along the gap.

(2) The washing water supply pipe is arranged parallel to the gap of the inclined plate, the plurality of nozzles are arranged in the washing water supply pipe along the gap, and the driving means connects the washing water supply pipe. It is moved along the inclined direction of the inclined plate.

(3) In the above (2), the inclined plate settling device is provided with a plurality of stages of the inclined plate aggregate in the water flow direction.
The settling tank has a partition wall at the bottom along the upper and lower ends of the inclined plate settling device in the flowing direction of the water to be treated and the boundary of the adjacent inclined plate aggregates.
The cleaning device is provided for each of the inclined plate assemblies in the flowing water direction.

(4) The nozzle has an injection port at the tip thereof, and is attached to the washing water supply pipe by inclining along the inclined direction of the inclined plate.

(5) The inclined plate sedimentation separation system has a rod-shaped support member extending along the washing water supply pipe and a blade having one end connected to the support member, and the support member is centered on a central axis. A sludge scraper is provided, which takes a state in which the blade is tilted and the other end is in contact with the bottom of the settling tank and a state in which the blade is not in contact with the bottom of the settling tank.
The washing water supply pipe is placed on the sludge scraper, and the washing water supply pipe and the sludge scraper move integrally by the driving means.

The second aspect of the present invention is the purification method of the inclined plate sedimentation separation system of the present invention.
At the same time that the washing water supply pipe is moved by the driving means, the washing water is supplied to the washing water supply pipe by the washing water supply means, and the washing water is supplied from the injection port of the nozzle toward the gap of the inclined plate. Is characterized in that the flocs adhering to the inclined plate are washed by injecting.

Further, the third aspect of the present invention is the purification method of the inclined plate settling separation system according to the above (5), in which the support member of the sludge collector is rotated and the other end of the blade is set to the bottom of the settling tank. At the same time that the sludge scraper and the washing water supply pipe are moved by the driving means, the washing water is supplied to the washing water supply pipe by the washing water supply means, and the injection of the nozzle is performed. By spraying washing water from the mouth toward the gap of the inclined plate, the flocs adhering to the inclined plate are washed, and then the flocs adhered to the inclined plate are washed.
By moving the sludge scraper and the washing water supply pipe by the driving means in a state where the support member is rotated so that the other end of the blade is in contact with the bottom of the settling tank, the blade causes the blade to move. The sludge accumulated at the bottom of the settling tank is scraped to one end in the moving direction of the sludge scraper.

According to the present invention, at least the two inclined plates from the bottom have the same inclination direction and are substantially linear, so that the lower inclined plate having a large amount of flocs attached can be washed at once from the bottom. Further, the washing water supply pipe provided with a plurality of nozzles for injecting washing water need only be moved in one direction, which is easy to control. Further, according to the present invention, the cleaning operation of the inclined plate can be performed during the operation of the inclined plate sedimentation separation system, that is, during the treatment of the water to be treated, so that the work frequency is increased and the inclined plate adheres to the inclined plate. Can be washed before the amount of flocs to be increased. Therefore, since the influence of the flocs that have settled on the inclined plate is reduced, it is possible to avoid a decrease in processing efficiency due to the same inclination direction of the plurality of inclined plates.

Further, since the cleaning device according to the present invention is arranged at the bottom of the settling tank, it is not necessary to separately provide a gap for arranging the cleaning device, and the entire system does not become large. In addition, by integrating with the conventional sludge scraper and using the drive means of the sludge scraper as the drive means of the cleaning device, the design change of the entire system can be minimized and the system can be purified efficiently. Can be done.

It is a front view which shows typically the structure of the 1st Embodiment of the inclined plate sedimentation separation system of this invention, and is the figure which was seen from the upstream side of the water to be treated. It is a top view of the embodiment of FIG. It is a side view of the usage form of the cleaning device and the sludge scraper in FIG. 1, (a) shows the time when the washing device is used, and (b) shows the time when the sludge scraper is used. It is a front view which shows typically the structure of the 2nd Embodiment of the inclined plate sedimentation separation system of this invention, and is the figure which was seen from the upstream side of the water to be treated. It is a top view of the embodiment of FIG. It is sectional drawing of AA'in FIG. It is a front view which shows typically the structure of one Embodiment of the conventional inclined plate sedimentation separation system, and is the figure which was seen from the upstream side of the water to be treated. It is a top view of the inclined plate sedimentation separation system of FIG.

The inclined plate settling and separating system (hereinafter referred to as "system") of the present invention has at least two inclined plate assemblies in the vertical direction, and the inclined plate of the inclined plate aggregate having at least two stages from the bottom is inclined in the inclined direction. It is characterized by being the same and having a cleaning device provided with a plurality of nozzles below the inclined plate settling device. Further, in the purification method of the inclined plate settling separation system of the present invention, while moving the cleaning device in one direction, cleaning water is sprayed from below toward the gap between the inclined plates to clean the flocs adhering to the inclined plate. It is characterized by removing.

Hereinafter, the present invention will be described in detail with reference to embodiments, but the present invention is not limited to such embodiments. In the present invention, a dispersion in which turbid components contained in the water to be treated are aggregated by adding a flocculant to increase the particle size is called "flock", and the flocs are separated from the water to be treated and settled in a settling tank. What is deposited on the bottom of the is called "sludge".

First, a conventional inclined plate sedimentation separation system will be described with reference to the drawings.

FIG. 7 is a front view schematically showing a conventional lateral flow type inclined plate settling separation system, and shows a state seen from the upstream side of the water to be treated. Further, FIG. 8 is a top view, in which the lower part of the paper surface is the upstream side of the water to be treated and the upper part is the downstream side, the arrow D1 indicates the direction in which the water to be processed flows toward the inclined plate settling device 10, and D2 indicates the inclination. The flow direction of the treated water from which the flocs are removed and discharged by the plate settling device 10 is shown. In FIG. 8, the PC (precast) girder 3 and the suspension bolt 14 shown in FIG. 7 are omitted. Further, the water to be treated and the treated water in the settling tank 1 are not shown.

As shown in FIGS. 7 and 8, in the lateral flow type inclined plate settling device 10, the surface (inclined surface) of the inclined plate 11 is tilted from the vertical direction, and a plurality of sheets are arranged in parallel and horizontally at regular intervals. Then, the inclined plate aggregate attached to the support frame 12 passed in the horizontal direction is provided in a plurality of stages in the vertical direction. In this example, the inclined plate assembly is provided in three stages in the vertical direction, and in the upper and lower two-stage inclined plate assembly, the support frame 12 for attaching the lower part of the upper inclined plate 11 is the inclination of the lower inclined plate assembly. It also serves as a support frame 12 for attaching the upper part of the plate 11.

The support frame 12 is fixed by a support frame 13 extending in the vertical direction, and a plurality of inclined plate aggregates are integrated. In the conventional inclined plate settling device 10, the inclined plates 11 are configured so as to be opposite to each other in the upper and lower two-stage inclined plate aggregates.

As shown in FIG. 7, the inclined plate settling device 10 is suspended in the settling tank 1 by a hanging bolt 14 attached to the PC girder 3 extending over the opening of the settling tank 1. Further, the inclined plate settling device 10 is arranged with a predetermined gap between the inclined plate settling device 10 and the side wall surface 1b so as not to come into contact with the side wall surface 1b of the settling tank 1 and be damaged when shaking such as an earthquake occurs. To.

Further, in the lateral flow type inclined plate settling device 10, as shown in FIG. 8, a plurality of inclined plate aggregates are arranged along the flowing direction of the water to be treated, and the gap between the inclined plates is straight in the above flowing direction. It is generally configured to have a shape. Further, even in the plurality of inclined plate aggregates arranged in the flowing direction of the water to be treated (arrow D1 direction), the inclined plates 11 of the inclined plate aggregates adjacent to each other in the flowing water direction are all inclined in the same direction. In this example, the inclined plate assemblies are arranged in three stages in the flowing water direction, and the inclined plate 11s of the adjacent aggregates are attached to a common support frame 12. Both ends of the inclined plate 11 in the horizontal direction are attached to the support frame 12 by a fixture (not shown), and a predetermined gap (not shown) is provided between the horizontal end of the inclined plate 11 and the support frame 12. Is formed. In the gap (not shown) interposed between the support frame 12 arranged between the adjacent inclined plate aggregates shown in FIG. 8 and the inclined plate 11, a support frame (not shown) extending in the vertical direction is not shown. (Corresponding to the frame 13) is arranged and connected to the support frame 12.

Embodiments in which the present invention is applied to the system of FIGS. 7 and 8 are shown in FIGS. 1 to 6. The inclined plate settling separation system of the present invention has a first embodiment in which a washing water supply pipe having a plurality of nozzles is moved along a gap between the inclined plates, and a second embodiment in which the washing water supply pipe is moved along the arrangement direction of the inclined plates. It is divided into embodiments. Hereinafter, each embodiment will be described in detail.

[First Embodiment]
In the first embodiment of the present invention, the washing water supply pipe is arranged parallel to the arrangement direction of the inclined plates, and the nozzles are arranged in the washing water supply pipe along the arrangement direction of the inclined plates at each gap of the inclined plates. The driving means is characterized in that the washing water supply pipe is moved along the gap.

FIG. 1 is a front view of the present embodiment and shows a state seen from the upstream side of the water to be treated. Further, FIG. 2 is a top view, in which the lower part of the paper surface is the upstream side of the water to be treated and the upper part is the downstream side. The flow direction of the treated water from which the flocs are removed and discharged by the plate settling device 10 is shown. In FIG. 2, the PC girder 3 and the suspension bolt 14 shown in FIG. 1 are omitted. In FIGS. 1 and 2, the same members as those in FIGS. 7 and 8 are designated by the same reference numerals and description thereof will be omitted, and water to be treated and water to be treated will not be shown.

As shown in FIGS. 1 and 2, in the present invention, the inclined plates 11 of the inclined plate aggregate having at least two stages from the bottom are arranged so that the inclined directions are the same. Further, even in the plurality of inclined plate aggregates arranged in the flowing water direction of the water to be treated, the inclined plates 11 adjacent to each other in the flowing water direction are all inclined in the same direction. In this example, the inclined plate aggregates having three stages in the vertical direction and three stages in the flowing water direction (arrows D1 and D2 directions) are provided, but the inclined directions of the inclined plates 11 are all the same.

The system of the present invention includes a cleaning device 20 below the inclined plate settling device 10. The cleaning device 20 includes a cleaning water supply pipe 21 provided with a plurality of nozzles 22, a driving means 23 for moving the cleaning water supply pipe 21 in the flowing direction of the water to be treated, and a guide rail 24. There is. The drive means 23 is connected to a control means (not shown) arranged outside the settling tank 1 by a means (not shown), and moves along the guide rail 24 under the control of the control means.

In the present embodiment, the nozzles 22 are arranged in each gap between the inclined plates 11 of the lowermost inclined plate settling device 10, and are attached to the washing water supply pipe 21 so that the injection port of the washing water faces the gap. ing. In the present embodiment, the nozzle 22 has an injection port at the tip thereof and is inclined along the inclination direction of the inclined plate 11. Therefore, when the cleaning water is supplied to the cleaning water supply pipe 21 at a high pressure from the cleaning water supply means (not shown), the cleaning water is injected from the injection port of each nozzle 22 toward the gap between the inclined plates 11 and on the inclined plate 11. The flocs adhering to the surface are washed and removed. As the washing water supply means, one end of a flexible supply pipe (not shown) is connected to the washing water supply pipe 21, and the other end of the supply pipe is connected to a water supply pump (not shown) arranged outside the settling tank 1. As the washing water, the water to be treated before and after the treatment may be used.

Further, in FIGS. 1 and 2, the sludge settled on the upper surface of the inclined plate 11 moves downward, and the sludge accumulated on the bottom 1a of the settling tank is attracted to one of the bottom 1a. This is an example provided with the machine 30. In the present embodiment, a rod-shaped support member 31 attached to the driving means 23 of the washing water supply pipe 21 and extending in the arrangement direction of the inclined plates 11, that is, the arrangement direction of the nozzles 22, and a blade having one end connected to the support member 31. The washing water supply pipe 21 is arranged and integrated on the sludge scraper 30 provided with 32. The blade 32 can be tilted about the central axis of the support member 31, and the other end can be in contact with the bottom 1a of the settling tank 1 or in non-contact with the bottom 1a.

In the embodiments of FIGS. 1 and 2, the driving means for moving the sludge scraping machine 30 in the flowing water direction also serves as the driving means 23 for the washing water supply pipe 21, and the sludge scraping machine 30 and the cleaning are cleaned by the driving means 23. The water supply pipe 21 can be integrally moved along the gap between the inclined plates 11.

The purification process in the system of FIGS. 1 and 2 will be described with reference to FIG. 3A and 3B are side views of the usage patterns of the cleaning device 20 and the sludge scraper 30 shown in FIGS. 1 and 2. FIG. 3A is a side view of the usage mode of the cleaning device 20 and FIG. 3B is a sludge scraper 30. Indicates the time of use.

First, a cleaning step is performed. As shown in FIG. 2, the cleaning device 20 and the sludge scraper 30 are arranged at the upstream end of the inclined plate settling device 10 in the flow direction of the water to be treated, and the support member 31 is rotated to rotate the support member 31 in FIG. As shown in (a), the blade 32 of the sludge scraper 30 is tilted so that the other end is separated from the bottom 1a of the settling tank 1. In this state, the driving means 23 moves the cleaning device 20 and the sludge scraper 30 along the guide rail 24 in the flow direction of the water to be treated, that is, in the direction along the gap between the inclined plates 11, which is not shown. High-pressure washing water is supplied from the washing water supply means to the washing water supply pipe 21, and the washing water is ejected from the nozzle 22. In the present invention, since the inclination directions of the inclined plates 11 of the inclined plate aggregates having at least two stages from the bottom are the same, the gaps between the inclined plates 11 of the inclined plate aggregates having the same inclined direction are also inclined in the same direction. The washing water reaches the inclined plate 11 of the inclined plate aggregate, and the flocs adhering on the inclined plate 11 are washed and removed. As a result, the cleaning water is continuously jetted from the nozzle 22 toward the other in the flow direction of the water to be treated into the gap between the inclined plates 11, and the flocs are completely removed.

Further, in the present embodiment, as shown by an arrow in FIG. 3A, the cleaning water is ejected from the nozzle 22 in a fan shape parallel to the surface of the inclined plate 11, so that the inclined plate 11 is uniformly and completely. It is preferable to wash. The pressure of the washing water per nozzle 22 depends on the water depth at the position of the nozzle 22 and the injection distance, but for example, the injection angle θ is about 30 °, and it is preferably about 0.3 to 3 MPa.

Next, a sludge scraping step is performed. When the cleaning device 20 and the sludge scraper 30 move to the downstream end of the inclined plate settling device 10 in the flowing water direction, the supply of cleaning water to the cleaning water supply pipe 21 is stopped and the support member 31 is rotated. Then, as shown in FIG. 3B, the blade 32 of the sludge scraper 30 is tilted so that the other end is in contact with the bottom 1a of the settling tank 1. In this state, when the cleaning device 20 and the sludge scraper 30 were moved along the guide rail 24 by the driving means 23 in the direction opposite to the cleaning step, the blades 32 deposited the sludge on the bottom 1a of the settling tank 1. The sludge is scraped in the moving direction of the sludge scraper 30.

As described above, the cleaning step and the sludge scraping step can be carried out by reciprocating the cleaning device 20 and the sludge scraping machine 30 once. In the above description, the case of going from the upstream side to the downstream side in the flow direction of the water to be treated is the outward route, the reverse direction is the return route, the cleaning process is performed on the outward route, and the sludge scraping process is performed on the return route. Not limited to. Further, it is not necessary to perform the two steps in a reciprocating manner, and the cleaning step may be performed in a reciprocating manner. Each step may be performed individually at an appropriate timing. For example, after performing the cleaning step a plurality of times, the sludge scraping step may be performed once. Since any of the steps can be carried out during the treatment of the water to be treated, there is no possibility that the treatment of the water to be treated is interrupted to carry out the washing step and the treatment efficiency is lowered. Therefore, by performing the cleaning step frequently, the amount of flocs adhering to the inclined plate 11 can be kept to a small amount, and the treatment efficiency of the water to be treated can be maintained high.

Since the amount of flocs adhered to the lower inclined plate aggregate, even if the washing water did not reach the uppermost inclined plate 11, the lower inclined plate 11 was washed and could not be completely removed. Since the flock on the upper inclined plate 11 moves toward the lower inclined plate 11, the flock adheres to the upper inclined plate 11 and the treatment efficiency of the water to be treated in the upper stage is lowered. It's not. Further, by performing the cleaning step frequently, the amount of flocs adhering to the inclined plate 11 can be suppressed to a small amount, so that there is no possibility that a large amount of flocs will fly up, and the inclined direction of the inclined plate of the plurality of inclined plate aggregates can be adjusted. Even if they are the same, the decrease in the treatment efficiency of the water to be treated due to the soaring of the flocs is avoided, and there is almost no effect of making the inclined plates of the plurality of inclined plate aggregates in the same inclined direction.

Therefore, in the present embodiment, the inclination direction of the inclined plate 11 is preferably the same in all the inclined plate aggregates having a plurality of stages in the vertical direction, but the inclined plate 11 is preferably in the inclined plate assembly having at least two stages from the bottom. If the inclination direction is the same, the cleaning step can be performed frequently and the treatment efficiency of the water to be treated can be maintained high. For example, in the present embodiment, the inclination directions of the inclined plates 11 of the three-stage inclined plate assembly in the vertical direction are all the same, but only the uppermost inclined plate assembly is different from the lower two-stage inclined plate assembly. The inclined plate 11 may be inclined in the opposite direction. In that case, even in the inclined plate aggregates adjacent to each other in the flowing water direction, the uppermost inclined plate aggregates all incline the inclined plates 11 in the direction opposite to the lower two inclined plate aggregates, and the uppermost inclined plate aggregates are inclined. The inclined plates 11 are inclined in the same direction between the plate assemblies.

[Second Embodiment]
In the second embodiment of the present invention, the washing water supply pipe is arranged parallel to the gap of the inclined plate, a plurality of nozzles are arranged in the washing water supply pipe along the gap, and the driving means is the washing water supply pipe. Is characterized by being moved along the inclination direction of the inclined plate.

In the second embodiment of the present invention, the washing water supply pipe 21 provided with the plurality of nozzles 22 of the first embodiment is arranged parallel to the gap between the inclined plates and moves in the arrangement direction of the inclined plates 11. The configuration is the same as that of the first embodiment, and the cleaning step using the cleaning device 20 and the scraping step using the sludge scraper 30 are also the same. Therefore, in the following description, points different from the first embodiment will be described.

FIG. 4 is a front view of the present embodiment and shows a state seen from the upstream side of the water to be treated. Further, FIG. 5 is a top view, in which the lower part of the paper surface is the upstream side of the water to be treated and the upper part is the downstream side, the arrow D1 is the direction in which the water to be treated flows toward the inclined plate settling device 10, and D2 is the inclined plate. The flow direction of the treated water from which the flocs are removed by the settling device 10 and discharged is shown. In FIG. 5, the PC girder 3 and the suspension bolt 14 shown in FIG. 4 are omitted. FIG. 6 is a cross-sectional view of a portion AA'in FIG. In FIG. 4, the partition wall 1c shown in FIG. 6 is not shown. In FIGS. 4 to 6, the same members as those in FIGS. 1 to 3, 7 and 8 are designated by the same reference numerals and description thereof will be omitted, and water to be treated and water to be treated will be omitted from the drawings.

As shown in FIGS. 4 to 6, in the present embodiment, the washing water supply pipe 21 provided with the plurality of nozzles 22 is arranged parallel to the gap of the inclined plate 11. Therefore, the plurality of nozzles 22 are arranged along the gap between the inclined plates 11. Since the nozzle 22 is tilted along the tilt of the tilt plate as in the first embodiment, in the first embodiment, the tilt direction of the nozzle 22 is the arrangement direction of the plurality of nozzles 22 (washing water supply pipe). 21), but in the present embodiment, the inclination direction of the nozzles 22 is a direction orthogonal to the arrangement direction of the plurality of nozzles 22 (a direction orthogonal to the longitudinal direction of the wash water supply pipe 21). The arrangement pitch of the plurality of nozzles 22 is set within a range in which the washing water can sufficiently reach the inclined plate 11. In particular, as shown by an arrow in FIG. 3A, the inclined plate 11 can be efficiently cleaned by ejecting the cleaning water from the nozzle 22 in a fan shape parallel to the surface of the inclined plate 11.

In the present embodiment, the cleaning device 20 is moved in the arrangement direction of the inclined plates 11, that is, in the direction orthogonal to the flowing direction of the water to be treated. Therefore, when a plurality of inclined plate aggregates are provided in the flowing water direction as in the present embodiment, it is preferable to deploy the cleaning device 20 for each inclined plate aggregate as shown in FIGS. 4 and 5. .. In the lateral flow type inclined plate settling device, more flocs adhere to the inclined plate 11 toward the upstream side in the flowing direction of the water to be treated. Therefore, as in the present embodiment, a plurality of cleaning devices 20 are provided along the flowing direction of the water to be treated, and each cleaning device 20 is driven at an independent timing according to the degree of adhesion of flocs to efficiently perform the cleaning process and the cleaning process. The scraping process can be carried out.

Further, in the present embodiment, the settling tank 1 is provided with a partition wall 1c on the bottom portion 1a. The partition wall 1c may be one built in the bottom portion 1a of the settling tank 1 or a partition wall 1c separately formed of a resin or metal material attached to the bottom portion 1a of the settling tank 1. The partition wall 1c is arranged along the upper and lower ends of the inclined plate settling device 10 in the flowing direction of the water to be treated and the boundary of the adjacent inclined plate aggregates. Therefore, even when any of the cleaning devices 20 is independently driven, the sludge accumulated on the bottom portion 1a does not spread in the flowing direction of the water to be treated from directly under the corresponding inclined plate aggregate, and is efficiently scraped. be able to.

In the present embodiment, the cleaning device 20 is provided for each of the inclined plate assemblies, but in the present invention, one cleaning device 20 is corresponded to a plurality of inclined plate aggregates. Also includes. In that case, it is preferable that the partition wall 1c is provided along the upper end of the inclined plate assembly on the upper end side in the flow direction of the water to be treated and the lower end of the inclined plate assembly on the lower end side, respectively.

1: Sedimentation tank, 1a: side wall surface, 1b: bottom, 1c: partition wall, 3: PC girder, 10: inclined plate settling device, 11: inclined plate, 12, 13: support frame, 14: hanging bolt, 20: cleaning Equipment, 21: Washing water supply pipe, 22: Nozzle, 23: Drive means, 24: Guide rail, 30: Sewage scraper, 31: Support member, 32: Bolt

Claims (8)

A lateral flow type inclined plate settling device suspended in a settling tank having at least two stages of inclined plate aggregates composed of a plurality of inclined plates whose inclined surfaces are arranged parallel to each other in the vertical direction, and the inclined plate An inclined plate settling separation system equipped with a plate cleaning device.
In the inclined plate settling device, the inclined plate of the inclined plate assembly having at least two stages from the bottom has the same inclined direction.
The cleaning device is arranged below the inclined plate settling device, and moves a cleaning water supply pipe having a plurality of nozzles having injection ports directed to gaps between the inclined plates of the inclined plate assembly and the cleaning water supply pipe. An inclined plate settling separation system including a driving means and a washing water supply means for supplying washing water to the washing water supply pipe. The washing water supply pipe is arranged parallel to the arrangement direction of the inclined plates, the nozzles are arranged in the washing water supply pipe along the arrangement direction for each gap of the inclined plates, and the driving means is the washing water. The inclined plate settling separation system according to claim 1, wherein the supply pipe is moved along the gap. The washing water supply pipe is arranged parallel to the gap of the inclined plate, the plurality of nozzles are arranged in the washing water supply pipe along the gap, and the driving means makes the washing water supply pipe the inclined plate. The inclined plate settling separation system according to claim 1, wherein the inclined plate is moved along the inclined direction of the above. The inclined plate settling device is provided with a plurality of stages of the inclined plate aggregate in the flowing water direction.
The settling tank has a partition wall at the bottom along the upper and lower ends of the inclined plate settling device in the flowing direction of the water to be treated and the boundary of the adjacent inclined plate aggregates.
The inclined plate settling separation system according to claim 3, wherein the cleaning device is provided for each inclined plate aggregate in the flowing water direction. The invention according to any one of claims 1 to 4, wherein the nozzle has an injection port at the tip thereof, is inclined along an inclined direction of the inclined plate, and is attached to the washing water supply pipe. Inclined plate settling separation system. The inclined plate sedimentation separation system has a rod-shaped support member extending along the washing water supply pipe and a blade having one end connected to the support member, and the support member rotates about a central axis. As a result, the sludge scraper is provided so that the blades are tilted and the other end is in contact with the bottom of the settling tank and in a non-contact state.
Any one of claims 1 to 5, wherein the washing water supply pipe is placed on the sludge gathering machine, and the washing water supply pipe and the sludge gathering machine are integrally moved by the driving means. The sludge plate settling separation system according to item 1. The purification method for the inclined plate sedimentation separation system according to any one of claims 1 to 6.
At the same time that the washing water supply pipe is moved by the driving means, the washing water is supplied to the washing water supply pipe by the washing water supply means, and the washing water is supplied from the injection port of the nozzle toward the gap of the inclined plate. A method for purifying an inclined plate sedimentation separation system, which comprises cleaning the flocs adhering to the inclined plate by injecting water. The purification method for the inclined plate sedimentation separation system according to claim 6.
At the same time, the sludge scraper and the washing water supply pipe are moved by the driving means in a state where the support member of the sludge scraper is rotated to separate the other end of the blade from the bottom of the settling tank. By supplying the washing water to the washing water supply pipe by the washing water supply means and injecting the washing water from the injection port of the nozzle toward the gap of the inclined plate, the flocs adhering to the inclined plate. Wash, then
By rotating the support member and bringing the other end of the blade into contact with the bottom of the settling tank, the sludge scraper and the washing water supply pipe are moved by the driving means, thereby causing the blade. A method for purifying an inclined plate sedimentation separation system, characterized in that sludge accumulated at the bottom of the sedimentation tank is scraped to one end of the sludge scraper in the moving direction.

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