JP2000024796A - Slurry dehydration device for muddy water treatment device and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small sized device capable of dehydrate/solidify slurry at a low cost and its using method. SOLUTION: The dehydration device is provided with a housing 31 having an opening part 37 and a drain port 38, a dehydration strainer 32 housed inside the housing, plural through holes 46 pierced into a wall face of the strainer 32, a pusher 33 forcedly fitted into the side of the strainer 32, a support part 35 to support the pusher 33 near an opening part of the housing 31 and a cylinder 34 supported to the support part and to operate forced fitting of the pusher 33. In the using method, a bag shape bag filter is mounted in the dehydration strainer 32 beforehand, after slurry is charged in the bag filter, the bag filter is closed, the support part 35 is arranged near an opening part of the housing 31, the pusher 33 is forcedly fitted into the dehydration strainer 32, after appropriately pressurizing and dehydrating, a whole including the bag filter is taken out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method of forming a floc by reacting turbid water with a flocculant, and then discarding a slurry (sludge) in which the floc is precipitated.
The present invention relates to an apparatus for dewatering this slurry and a method for using the same.

[0002]

2. Description of the Related Art In a construction requiring excavation such as burial of a sewer pipe or the like, when excavating underground, underground water may flow out. However, since the already excavated part will be flooded, it will be an obstacle to the excavation work, and the construction will be continued while draining using a submersible pump etc.
Since it contains a lot of earth and sand, the turbidity is high, and it is not only environmentally unfavorable to discharge it as it is,
When a normal gutter is used, there has been a problem that the gutter cannot be used due to the accumulation of earth and sand.

[0003] Such turbid water should be discharged after being purified. At present, however, soil and sand are removed by a filtration device or purified by a water treatment device using a flocculant. In this water treatment apparatus, flocs formed by reacting a flocculant with turbid water are precipitated, and the supernatant water is discharged as treated water, but the flocs precipitated in the water treatment apparatus contain water. However, the slurry remains after being dried, and the slurry is dewatered to form a cake and then discarded. However, it is naturally indispensable to dewater the slurry. Therefore, in the conventional dewatering device, dewatering is performed using a filter press machine or the like.

[0004]

However, the above-described dewatering device using a filter press or the like is a device for dewatering a large amount of slurry, and is largely used for underground construction at the time of tunnel construction or building construction. This is appropriate when dewatering a large amount of slurry generated during excavation.
Since such a filter press or the like slowly adds a large output, it takes a long time to sufficiently remove water contained in the slurry. In addition, in order to perform dehydration by the above-described filter press machine or the like, the device must be capable of withstanding a large output, and therefore, the device is large in size as a whole. In addition to the need for a hydraulic pump unit as a power source, the area required for installing the equipment is large, and it is necessary to install it on a narrow construction site on the road, such as a site for laying water and sewer pipes. There was something I couldn't do. In addition, the number of types of devices is complicated and the number of types is large, and a dedicated engineer for maintenance or management is required.

The present invention has been made in view of the above circumstances, and has as its object to provide a small apparatus capable of solidifying a slurry at low cost and a method of using the same.

[0006]

SUMMARY OF THE INVENTION The present invention provides a housing having an opening and a drain, a dewatering strainer supported inside the housing and opening near the opening of the housing, and a wall provided on the dewatering strainer. A plurality of through-holes penetrated, a pusher capable of being press-fitted from the opening of the dewatering strainer to the inside, a support portion for supporting the pusher near the opening of the housing, and press-fitting of the pusher while being supported by the support portion. A dewatering device for slurry in a turbid water treatment device, comprising: a cylinder for operating the slurry.

In the above-mentioned method of using the dewatering device, a bag-shaped bag filter is previously mounted in a dewatering strainer, and after slurry is charged into the bag filter, the bag filter is closed and the bag filter is closed. A method for using a slurry dewatering apparatus, comprising: disposing a portion near a housing opening; pressing a pusher into a dewatering strainer; dehydrating under pressure as appropriate; and taking out the entirety including a bag filter. Things. In this case, it is preferable that the slurry is fed into a bag filter after supplying and stirring a floc forming aid.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. Since the present invention is an apparatus for dehydrating and solidifying a slurry that precipitates in a turbid water treatment apparatus, the outline of the turbid water treatment apparatus will be described first. As shown in FIG. 1, the treatment apparatus 1 has a stirring tank 2 and a precipitation tank 3 provided integrally, and both tanks 2 and 3 are separated by a partition wall 4. A partition plate 5 is provided in the stirring tank 2, and the first stirring chamber 6 and the second stirring chamber 7 are configured by partitioning the stirring tank 2. Is communicated below. On the other hand, the same kind of partition plate 8 is provided in the precipitation tank 3, and the partition plate 8 constitutes a rectification chamber 9 and a precipitation chamber 10. The rectifying chamber 9 and the sedimentation chamber 10 are also communicated below the partition plate 8. Of each of the chambers 6, 7, 9, and 10 configured as described above, the second stirring chamber 6 and the rectifying chamber 9 are continuous at the upper part, and the water level of the second stirring chamber 7 is higher than the upper edge of the partition wall 4. When the temperature rises, the water flows into the rectifying chamber 9 over the partition wall 4. The first stirring chamber 6 contains water to be treated (hereinafter, referred to as water).
Raw water (hereinafter referred to as raw water) W is introduced, and treated water (hereinafter, referred to as treated water) Ws is discharged from the precipitation chamber 10. A filter 11 is provided on substantially the entire surface of the settling chamber 10. When the water level in the settling chamber 10 becomes higher than the filter 11, the filter 11 can flow into the drainage section 12. Further, a flocculant introduction section 13 is provided above the first stirring chamber 6, and both the first stirring chamber 6 and the second stirring chamber 7 are stirred by propellers 14 and 15. 14 and 15 are motors 16,
Rotate by 17. Further, the same type of sludge hoppers 21 and 22 are formed below the stirring tank 2 and the precipitation tank 3. 22
It precipitates on the surface. The precipitated flocs are deposited as sludge S1 and S2, and the valves 23 and 2
4 or by suction with a slurry pump or the like. The rectification chamber 9
Is provided with a wave-dissipating plate 18 so that waves caused by stirring in the stirring tank 2 do not reach the precipitation tank 3.
Floc sedimentation is facilitated.

Next, an embodiment of the present invention will be described. As shown in FIGS. 2A and 2B, a dehydrating apparatus 30 of the present embodiment includes a housing 31 having an open top, a dehydrating strainer 32 supported therein, and press-fitting into the dehydrating strainer 32. And a pusher 33 that can be used. The press-fitting of the pusher 33 is operated by a hydraulic cylinder 34, and the main body of the hydraulic cylinder 34 is fixed to a support 35 that supports the pusher 33 while suspending the opening of the housing 31, and the tip of a rod 36 is connected to the pusher 33. It is connected. That is, when the rod 36 advances and retreats from the hydraulic cylinder 34, the pusher 33
Changes the distance from the support portion 35, and the dehydrating strainer 3
2 can move in and out.

The housing 31 is provided in a cylindrical shape large enough to accommodate the dewatering strainer 32, and at its lower part, drainage portions 37 and 38 for drainage are provided. In the present embodiment, the drains 37 and 38 are
It is configured as a drain port penetrating the side wall of the housing 31. This is because the bottom portion 39 is provided in the housing 31, and there is no problem that the entire lower portion is used as the drainage portion 37 (38) without providing the bottom portion 39.

The dewatering strainer 32 is supported inside the housing 31 while keeping a sufficient distance from the bottom 39 and the side wall.
The steel plates 40, 41 are provided by standing on the bottom portion 39, and the distance between the side walls is four.
43, 44, and 45 are provided by welding in a rib shape.
The dewatering strainer 32 has a large number of through holes 46.
The water squeezed inside the dewatering strainer 32 can be discharged from the through hole 46 to the outside of the dewatering strainer 32 (inside the housing 31).

A support portion 35 is suspended from the upper openings of the housing 31 and the dewatering strainer 32 as described above. The support portion 35 is formed in a substantially U-shape as a whole. , 48 are supported around the opening of the housing 31. The pivot at one end 47 is rotatably provided and cannot be easily detached, and the pivot at the other end 48 is such that the fixed shaft 49 is detachable. And
By inserting the fixed shaft 49 into the end portion 48, the end portion 48 can be fixed to the housing 31, and by detaching the fixed shaft 49, the end portion 48 can be made free. In this state, the entire support portion 35 can be rotated around the one end portion 47. That is, the pusher 33, the cylinder 34, and the support 35 can be removed from the vicinity of the openings of the housing 31 and the dewatering strainer 32. Work is made easier.

The pusher 33 is connected to the rod 36 of the cylinder 34 in the hollow interior of the substantially bowl-shaped main body, and ribs 50, 51, 52, 53 for reinforcement are radially provided in the hollow interior of the pusher 33. It is provided in.
At the center where the ribs 50 to 53 are concentrated, there is formed a connecting member 54 which is pivotally supported with play, and the connecting portion 54 and the rod 3 of the cylinder 34 are formed.
6 is connected. Therefore, the pusher 33
Has a structure that can have an arbitrary angle with respect to the rod 36 of the cylinder 34. When the pusher 33 is press-fitted by the cylinder 34, the pusher 33 can freely select a suitable angle. is there.
The pusher 33 is connected to the rod 3 of the cylinder 34.
6 is raised by retreating the pusher 33, but when the pusher 33 moves
Are located below the support portion 35. Then, at that position, when the free end 48 of the support portion 35 is fixed by the fixed shaft 49, a part of the lower side of the pusher 33 is located inside the opening of the dehydration strainer 32, The operation of the cylinder 34 causes the pusher 33 to move down inside the dewatering strainer 32.

Next, the usage of this embodiment will be described.
Since the present embodiment has the above-described configuration, first, as shown in FIG. 3, the pusher 33 is removed from the opening of the dewatering stoner 32 by rotating the support end portion 47 of the support portion 35. At the same time, the openings above the openings of the dewatering strainer 32 and the housing 31 are largely opened. In this state, the bag filter 60 is housed inside the dewatering strainer 32 and the opening 61
Is mounted so as to overlap around the opening of the dewatering strainer 32. Here, the bag filter 60 is a filter configured in a bag shape, and is provided by welding or sewing a filter member made of a material having water permeability.

Subsequently, as described above, the dehydrating strainer 3
The slurry to be dehydrated is put into the inside of the bag filter 60 attached to the second filter. When charging this slurry,
Valves 23 and 24 of sludge hoppers 21 and 22 (FIG. 1)
By moving a discharge port of a slurry pump or the like that sucks slurry from the slurry, the slurry can be directly charged from the sludge hoppers 21 and 22. In some cases, the slurry can be supplied manually from a tank or the like in which the slurry sucked and removed from the sludge hoppers 21 and 22 is stored or by using a suction pump. In this way, a predetermined amount of slurry is
After that, as shown in FIG. 4, the vicinity 61 of the opening of the bag filter 60 is closed (by a method such as tying with a string) to complete the preparation for compression.

Next, the support portion 35 is centered on the shaft support end 47.
Is rotated, and the pusher 33 is disposed inside the opening of the dewatering strainer 32. In this state, pusher 3
3 is located above the bag filter 60, and the lowering of the pusher 33 causes the bag filter 60 to move.
Can be compressed. Then, by fixing the free end 48 of the support portion 35 with the fixed shaft 49, the support portion 35 is connected to the housing 31 and the dewatering strainer 3.
2 will be fixedly disposed above the opening. In this state, by starting the operation of the cylinder 34,
By pushing down the pusher 33, the entire bag filter 60 can be compressed.

Then, as shown in FIG.
3 is sufficiently lowered, the compressive force of the pusher 33 is transmitted to the internal slurry via the bag filter 60, and as the slurry is compressed, moisture passes through the eyes of the bag filter 60. And will seep out. After passing through the through hole 46 of the dewatering strainer 32, such water is dropped on the lower portion of the housing 31 and discharged from the drainage portions 37 and 38 to the outside of the housing 31. This wastewater can be disposed of as treated water separated from the floc. However, in consideration of the possibility that the floc is mixed from the eyes of the bag filter 60, the wastewater is returned to the turbid water treatment device 1 (FIG. 1). It is preferable to purify the water to be cleaner by treating again.

It goes without saying that various embodiments can be adopted without departing from the spirit of the present invention. For example, as the bag filter 60, a cloth sewn with a cloth made of natural fibers can be used, or a bag made of a cloth made of synthetic fibers may be used. Before the slurry is put into the back filter 60, a floc forming aid can be mixed with the slurry, and such mixing of the floc forming aid improves the dewatering effect. That is, dewatering is performed by allowing water to seep outward while passing through the bag filter 60. Since the floc and water are separated at the boundary of the bag filter 60, the floc forming auxiliary agent is used. If a large floc is formed by the introduction of water, the above-mentioned separation becomes clear, so that the mixing of the floc into the water transmitted through the bag filter 60 can be suppressed.

It is also possible to reuse the bag filter 60 by removing the dewatered floc from the bag filter 60 and discarding the floc. Since it can be carried as a solid when transported for disposal, the disposal operation can be simplified.

[0020]

As described above, the present invention provides a housing having an opening and a drain, a dewatering strainer supported inside the housing and opening near the opening of the housing, and a wall surface of the dewatering strainer. A plurality of through-holes, a pusher that can be press-fit into the opening from the opening of the dewatering strainer, a support that supports the pusher near the opening of the housing, and a pusher that is supported by the support. Since the gist is a slurry dewatering device in the turbid water treatment device, which is provided with a cylinder for operating the press-fitting, a small amount of slurry enough to enter the dewatering strainer is dewatered, and the pusher is press-fitted. The output can be reduced in size. As a result, the size of the press-fitting cylinder is reduced, and this can be integrally provided above the housing. Furthermore, since the cylinder can be operated by a small hydraulic unit by reducing the size of the cylinder, the apparatus and peripheral devices can be reduced in size and weight.

In the above-mentioned method of using the dewatering device, a bag-shaped bag filter is mounted in a dewatering strainer in advance, a slurry is charged into the bag filter, the bag filter is closed, and the bag filter is closed. A method for using a slurry dewatering apparatus, comprising: disposing a part near a housing opening; pressing a pusher into a dewatering strainer; dehydrating under pressure as appropriate; and taking out the entirety including a bag filter. Therefore, the floc and water constituting the slurry can be separated by a bag filter, and the compression force by the pusher is
In the inside of the bag filter, the slurry uniformly acts on the slurry, and the dewatering state can be made uniform. Further, the volume of the slurry is reduced inside the bag filter, and only water that can permeate the bag filter oozes out of the bag filter, so that dewatering by solid-liquid separation is facilitated. In addition, since the bag filter is taken out together with the floc after dehydration, a different (new) bag filter is always used, and the trouble of replacing the bag filter can be omitted.

In the case of the above-mentioned use, the slurry is supplied with a floc forming aid and agitated and then charged into a bag filter to remove the floc constituting the slurry. Since it is possible to form a large floc, such a large floc cannot pass through the bag filter, so that flocs mixed into the water discharged by the dehydration can be reduced, and the dehydration effect can be improved.

[Brief description of the drawings]

FIG. 1 is an explanatory view schematically showing a turbid water treatment device.

FIG. 2 is a plan view and a vertical cross-sectional view showing a solidifying device of the embodiment.

FIG. 3 is an explanatory view showing a state in which a bag filter is mounted.

FIG. 4 is an explanatory view of a state in which an opening of a bag filter is closed.

FIG. 5 is an explanatory diagram showing a state before dehydration.

FIG. 6 is an explanatory diagram showing a state after dehydration.

[Explanation of symbols]

 2 Stirring tank 3 Precipitation tank 21, 22 Sludge hopper 23, 24 Valve 31 Housing 32 Dehydration strainer 33 Pusher 34 Hydraulic cylinder 35 Supporting part 36 Cylinder rod 37, 38 Drainage part 39 Bottom part 46 Through hole 60 Bag filter W Raw water Ws Treated water S1, S2 sludge

Continuation of the front page (72) Inventor Atsushi Okubo 15th Avenue, Tanikawacho, Toyokawa-shi, Aichi F-term in Hosho Toyokawa Branch (reference) 4D059 AA09 BE16 BE18 BE31 BE54 BE62 BJ01 BJ06 BJ16 CA24 CB27

Claims (3)

[Claims] 1. A housing having an opening and a drain, a dewatering strainer supported inside the housing and opened near the opening of the housing, and a plurality of through holes formed through the wall surface of the dewatering strainer. A pusher that can be press-fitted from the opening of the dehydration strainer into the inside, a support portion that supports the pusher near the opening of the housing, and a cylinder that is pressed by the pusher while being supported by the support portion. An apparatus for dewatering a slurry in a turbid water treatment apparatus. 2. A housing having an opening and a drain, a dewatering strainer supported inside the housing and opened in the vicinity of the opening of the housing, and a plurality of through holes formed through the wall surface of the dewatering strainer. A pusher that can be press-fitted from the opening of the dehydration strainer into the inside, a support portion that supports the pusher near the opening of the housing, and a cylinder that is pressed by the pusher while being supported by the support portion. In the slurry dewatering apparatus, a bag-shaped bag filter is mounted in advance in a dewatering strainer, and after the slurry is charged into the bag filter, the bag filter is closed, and the support portion is arranged near the housing opening. Then, push the pusher into the dewatering strainer, pressurize and dehydrate appropriately, A method for using a slurry dewatering apparatus, wherein the whole including a filter is taken out. 3. The method for using a slurry dewatering apparatus according to claim 2, wherein the slurry is supplied with a floc forming aid and stirred, and then charged into a bag filter.