JPH07213806A - Solid-liquid separation device - Google Patents

Abstract

(57) [Summary] (Correction) [Purpose] To provide a novel solid-liquid separation device that can be separated and removed separately, and thus the separated solids can be easily dehydrated. A separation tank 1 including a cylindrical wall portion having a suspension inlet 4 provided at an angle that gives a swirling flow to a suspension,
A trough 13 for collecting clear water overflowing from the upper end, a first inner cylinder part 2 having a clear water discharge channel connected to the gutter, and an upper end position higher than the upper end of the first inner cylinder part And the lower end is located between the bottom of the separation tank and the lower end of the first inner cylinder, and the second inner cylinder 3 and the inner surface of the first inner cylinder and the outer surface of the second inner cylinder. The sludge plate module 6 provided above the partitioned area, the fine particle sludge collecting plate 5 provided below the slanted plate module 6, the coarse particle sludge settled at the bottom of the separation tank, and the fine particle sludge collecting plate were collected. A solid-liquid separation device comprising a means for respectively discharging fine particle sludge and the outside of the device.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solid-liquid separation device for continuously separating a suspension containing solid particles having different particle diameters into solid particles and clear water, and more particularly to a solid-liquid separator The present invention relates to a solid-liquid separation device that can separate particles and fine particles simultaneously and separately.

[0002]

2. Description of the Related Art Conventionally, as a device for separating and removing suspended solids in a suspension, a sedimentation separation device utilizing gravity such as a lateral flow type sedimentation tank, an upward flow type sedimentation tank, a liquid cyclone, or the like. A separation device such as a cyclone pit that utilizes centrifugal force due to a swirling flow is generally used.

In the solid-liquid separation method in which the solid content in the suspension is separated by utilizing the centrifugal force generated by swirling the suspension, the separation tank is removed for the purpose of increasing the separation efficiency of the solid content. It has a double structure of a cylinder and an inner cylinder, and (1) the suspension is swirled by flowing into the region between the outer cylinder and the inner cylinder, and the centrifugal force by this swirling flow separates and sediments coarse particles. Then, the swirling of the suspension is weakened by the rectification effect of the inner cylinder, and the fine particles remaining in the suspension are gravity settled in the inner cylinder, or (2) the suspension is swirled in the inner cylinder. Inflow to create a flow,
An annular inclined plate having a plurality of radial plate walls for the purpose of separating and settling coarse particles by the centrifugal force of the swirling flow in the inner cylinder part and reducing the influence of the swirling flow in the region between the outer cylinder part and the inner cylinder part. A method has been proposed in which a module is provided and the particles are settled by gravity in a region between the outer cylinder part and the inner cylinder part.

[0004]

The above-mentioned conventional methods using the swirling flow have their own respective effects.
In any of the above methods (1) and (2), the coarse particles separated by the centrifugal force of the swirling flow and the fine particles separated by gravity separation are deposited on the bottom of the tank in a mixed state, The solid content thus obtained must be discharged from the separator as a mixture of coarse particles and fine particles. As a result, the treatment of the solid matter discharged from the separator (concentration treatment, dehydration treatment, etc.) must be carried out as it is as a mixture of coarse particles and fine particles, and the treatment of the discharged solid matter is extremely difficult. .

For example, the coarse particles in the mixture have a very good settling property and drainage of the produced water, and although they can be easily concentrated and dehydrated by a simple settling separator such as a coarse particle separator, fine particles are mixed. Therefore, the fine particles are hardly concentrated and dehydrated by the simple sedimentation separation device, and the fine particles are suspended in the separation water (for example, filtered water) separated by the separation device and separated by the coarse particle separator or the like. There is a problem in that in order to remove suspended fine particles, additional treatment such as concentration and dehydration must be performed.

Further, the fine particles in the mixture obtained by solid-liquid separation have poor sedimentation and dewatering properties as compared with coarse particles, and it is common to perform dewatering treatment after sedimentation and concentration with a thickening device such as thickener. If coarse particles are mixed, it is difficult to drain mud in the concentrator, and there is a possibility that piping and other equipment may be worn or the filter cloth of the dehydrator may be damaged during drainage and dehydration. There is a problem of being extremely expensive.

Further, when the settled solid content is discharged to the bottom of the separation device, since the solid content is a mixture of coarse particles and fine particles, for example, when a grab bucket or the like is used as the discharging means. , It is difficult to efficiently discharge the fine particles in the solid content, and many of the fine particles remain on the bottom of the separation device. There has been a complexity that the accumulated fine particles have to be removed from the separation device by another discharge method such as dredging. Therefore, the object of the present invention is to solve the above-mentioned problems of the prior art, and in solid-liquid separation, it is possible to separate and remove coarse particles and fine particles simultaneously and separately. It is to provide a novel solid-liquid separation device that is easy to perform.

[0008]

The above object can be achieved by the present invention described below. That is, the present invention has a mortar-shaped bottom having an open upper end and a downward slope in the center, and a suspension provided at a predetermined upper position at an angle that gives a swirling flow to the suspension. A separation tank composed of a cylindrical wall portion having an inflow port, a gutter provided substantially concentrically inside the separation tank, having upper and lower ends opened, and collecting clear water overflowing from the upper end, and the gutter. A first inner cylinder portion having a connected clear water discharge channel;
The upper and lower ends are provided substantially concentrically in the first inner cylinder, the upper end is higher than the upper end of the first inner cylinder, and the lower end is the bottom of the separation tank and the first inner cylinder. A second inner cylinder portion positioned intermediate the lower end of the second inner cylinder portion, an inclined plate module provided above the area defined by the inner surface of the first inner cylinder portion and the outer surface of the second inner cylinder portion, and below the inclined plate module. And a means for discharging coarse particle sludge settled at the bottom of the separation tank and fine particle sludge collected by the fine particle sludge collecting plate to the outside of the apparatus, respectively. It is a solid-liquid separation device.

[0009]

The swirling flow in the region between the cylindrical wall of the separation tank and the first inner cylinder causes the coarse particles in the suspension to be separated and settled and accumulated at the bottom of the separation tank. On the other hand, the coarse particles are removed, and the suspension containing fine particles is sent to a region between the inner wall of the first inner cylinder part and the outer wall of the second inner cylinder part, and is rectified by the inclined plate module, so that the fine particles are gravitated. Although the particles settle, the particles that have separated and settled are collected by a particle collecting plate provided below the inclined plate module, so that they do not mix with the coarse particles collected at the bottom of the separation tank. Therefore, by discharging the coarse particles and the fine particles simultaneously and separately, the problems of the prior art caused by mixing the fine particles and the coarse particles and discharging the sludge are solved.

[0010]

EXAMPLES The present invention will be described in more detail with reference to the following preferred examples. FIG. 1 shows a sectional view of an embodiment of the present invention, and FIG. 2 shows a partially cutaway plan view. As shown in the figure, the solid-liquid separation device of the present invention has a mortar-shaped bottom portion that is open at the upper end and is inclined downward toward the center, and gives a swirling flow to the suspension at a predetermined upper position. A separation tank 1 consisting of a cylindrical wall portion having a suspension inlet 4 provided at an angle, and a concentrator which is provided substantially concentrically inside the separation tank 1 and whose upper and lower end portions are open and which overflows from the upper end. A gutter 13 for collecting water, a first inner cylindrical part 2 having a clear water discharge channel 7 connected to the gutter 13, and a first inner cylindrical part 2 provided substantially concentrically with the upper and lower end parts. Is opened, the upper end is located at a position higher than the upper end of the first inner tubular part 2, and the lower end is located between the bottom of the separation tank 1 and the lower end of the first inner tubular part 2. The tubular portion 3, the inclined plate module 6 provided above the region defined by the inner surface of the first inner tubular portion 2 and the outer surface of the second inner tubular portion 3, and provided below the inclined plate module 6. And fine sludge collector mud plate 5 that, separation tank 1 bottom coarse sludge A and fine sludge collector mud plate precipitated in section 5
It is characterized in that it comprises means 10 and 11 for respectively discharging the fine particle sludge B collected by the above.

In the above solid-liquid separation device, the separation tank 1 is a tank having a capacity of about 5 to 5,000 m ^{3 and} having a cylindrical shape in the upper part and a mortar shape in which the bottom part is inclined toward the center. Formed from stainless steel, concrete, etc. An inflow port 4 for introducing a suspension into the separation tank 1 is provided on the upper part of the separation tank 1, and the inflow port 4 is inside the cylindrical portion of the separation tank 1 and outside the first inner cylindrical portion 2. The suspension is provided so as to discharge the suspension in a tangential direction in the region between the two, and a swirling flow that flows along the inner wall of the separation tank 1 is formed in the suspension retained in the region.

The inflow port 4 is designed to supply a suspension having a flow rate according to the capacity of the separation tank 1 at an appropriate flow rate. For example, when the separation tank 1 has a diameter of 10 m and a capacity of 500 m ³ , the suspension is supplied at a flow rate of 40 to 50 m ³ / min. And a flow velocity of 1 to 5 m / sec. It is introduced into the separation tank 1 to some extent.

The suspension supplied into the separation tank 1 is swirled in the tank to separate and settle particles having a relatively large particle size or a large specific gravity present in the suspension by centrifugal force. The separated coarse particles move along the inner wall of the cylindrical portion of the separation tank 1 and the mortar-shaped bottom, and accumulate as coarse particle sludge A at the center of the bottom. The suspension in which the coarse particles are separated and containing the fine particles is used as an inner surface of the first inner cylindrical portion 2 and the second inner cylindrical portion 3.
It swirls and rises in the region formed by the outer surface of the sludge, passes through the gaps between the plurality of fine particle sludge collecting plates 5, and rises toward the inclined plate module 6.

The first inner cylindrical portion 2 has a cylindrical shape whose upper and lower end portions are open, and its upper end is lower than the upper end portion of the separation tank 1 and substantially at the height of the water surface of the separation tank 1. Clear water overflows from the upper end into the collecting trough 13, and the overflowing clear water flows into the trough 1.
It flows in the discharge channel 7 of the clear water which is connected to 3. This first inner cylindrical portion 2 has a diameter of about 70 to 80 of the separation tank 1.
% And a length of about 25 to 80% of the depth of the separation tank 1 are provided substantially concentrically inside the separation tank 1 by means not shown.

On the other hand, the second inner cylindrical portion 3 is, similarly to the first inner cylindrical portion 2, a cylindrical shape whose upper and lower end portions are open, and its upper end is higher than the upper end portion of the first inner cylindrical portion 2. The lower end is located between the bottom of the separation tank 1 and the lower end of the first inner tubular portion 2. The second inner cylinder portion 3 has a sludge discharge pipe 10,
11 or a diameter capable of inserting the coarse particle sludge sludge pump 9, which is determined by the balance of the entire apparatus, and is generally about 20 to 30% of the diameter of the separation tank 1 and the separation tank. 1 has a length of about 70 to 85% of the depth of No. 1 and is provided substantially concentrically inside the first inner cylindrical portion 2 by means not shown.

The fine particle sludge collecting plate 5 provided in the region between the inner wall of the first inner cylinder 2 and the outer wall of the second inner cylinder 3.
Is composed of a plurality of arbitrary inverted conical truncated cone-shaped plates that are open at the top and bottom, and the uppermost mud collecting plate 5 _{1 of the} mud collecting plate 5
Is connected to the inner bottom portion in the first inner cylinder portion 2 of the inclined plate module 6, on the other hand, current mud plate 5 _second bottom, the microparticles sludge connected to the second inner cylinder portion 3 of the outer wall surface Forming a mud collecting area B of One or more, preferably 2 to 5 mud collecting plates 5 ₃ are provided between the mud collecting plates 5 ¹ and 5 _2, and each mud collecting plate 5 is connected to the lower end of the upper stage portion. The upper end of the lower part partially overlaps on the projection surface, and the suspension is arranged so as to have a predetermined gap in the overlapping region where the suspension flows upward from below. Radial plate wall (not shown)
Are fixed to the first and second inner cylinders by the above, the swirling flow is weakened when the suspension passes through the gap, and the mud collecting plate 5 also performs the rectifying action of the suspension. The angle of these mud collecting plates 5 with respect to the vertical is preferably about 30 to 60 °.

The suspension that has passed through the gap of the fine particle sludge collecting plate 5 is rectified from a swirling flow to an upward flow, and while passing through the inclined plate module 6, fine particles are efficiently dispersed in the suspension due to gravity settling. Segregated and separated. Fine particles that have settled down are mud collecting plates 5
Descends along, are integrated as a fine sludge B in collecting mud region formed in a donut shape by the outer wall of the bottom of the current mud plate 5 ₂ and the second inner cylinder portion 3. In this mud collecting area B,
A fine particle sludge collecting pipe 8 having many suction ports on the surface is provided, and this fine particle sludge collecting pipe 8 has a fine particle sludge collecting pipe 11
Are connected.

The inclined plate module 6 may be a flat plate type, a honeycomb type, or any other commonly known type, and the inclination angle is 3.
The angle is about 0 to 60 °, which is preferably easy to process into a cylindrical shape, and is installed in several blocks. The distance between the inclined plates of the inclined plate module 6 and the thickness in the vertical direction are determined by the properties of the suspended substances in the inflowing raw water and the treated water quality (suspended substance concentration) required for the present apparatus, but in general, The interval between the inclined plates is about 10 to 200 mm, and the vertical thickness of the inclined plate module is about 50 to 200 mm. As described above, the clear water from which the coarse particles and the fine particles have been separated and removed overflows from the upper end of the first inner tubular portion 2, and the water collecting trough 13
The water is collected in and discharged through the discharge flow path 7 to the outside of the apparatus.

The coarse particle sludge A collected at the bottom of the separation tank 1 is discharged out of the apparatus by any means such as a grab bucket, a sludge pump 9, a vacuum hose, etc. After being concentrated and dehydrated by various devices, it is disposed. On the other hand, fine sludge B which is Atsumaridoro the current mud region formed in a donut shape by the outer wall of the bottom of the current mud plate 5 ₂ and the second inner cylinder 3, the vacuum tanks of the pump 12 and not shown It is discharged to the outside of the apparatus through the fine particle sludge collecting pipe 8 and the sludge discharging pipe 11, and is settled and concentrated and dehydrated by any means such as thickener, and then disposed.

[0020]

[Effect] According to the present invention as described above, since coarse particles and fine particles in the suspension are collected and discharged simultaneously and separately, the fine particles and the coarse particles are mixed and discharged. The problems of the conventional method have been solved.

[0021]

[Brief description of drawings]

FIG. 1 is a diagram schematically illustrating a cross section of an apparatus of the present invention.

FIG. 2 is a diagram schematically illustrating a plane of the device of the present invention.

[Explanation of symbols]

 1: Separation tank 2: First inner cylinder part 3: Second inner cylinder part 4: Inlet port 5: Fine particle mud collecting plate 6: Inclined plate module 7: Clear water discharge channel 8: Fine particle sludge collecting pipe 9: Coarse Particle sludge drainage pump 10: Coarse particle sludge drainage pipe 11: Fine particle sludge drainage pipe 12: Fine particle sludge drainage pump 13: Water collecting trough A: Coarse grain sludge B: Fine particle sludge

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masashi Wakiyama 2-5-12 Higashikanda, Chiyoda-ku, Tokyo Environmental Engineering Co., Ltd.

Claims (2)

[Claims] 1. A suspension flow having an open upper end, a mortar-shaped bottom that is inclined downward toward the center, and provided at a predetermined upper position at an angle that gives a swirling flow to the suspension. A separation tank composed of a cylindrical wall portion having an inlet, a trough provided substantially concentrically inside the separation tank, having upper and lower end portions opened, and collecting clear water overflowing from the upper end, and the gutter connected to the trough A first inner cylinder portion having a clear water discharge channel, and the upper and lower end portions of which are provided substantially concentrically in the first inner cylinder portion, the upper end portion of which is higher than the upper end of the first inner cylinder portion. And the lower end is located between the bottom of the separation tank and the lower end of the first inner cylinder, and is divided by the inner surface of the first inner cylinder and the outer surface of the second inner cylinder. Slanted plate module provided above the sewage area, fine particle sludge collecting plate provided below it, and coarse particles settled at the bottom of the separation tank. A solid-liquid separation device comprising: a child sludge and a means for respectively discharging the fine particle sludge collected by the fine particle sludge collecting plate to the outside of the device. 2. The solid-liquid separation device according to claim 1, wherein the coarse particle sludge and fine particle sludge discharge means has a discharge pipe suspended in the second inner cylinder part.