JPH0639318A - Thickener - Google Patents

Abstract

PURPOSE:To provide a thickener wherein even a slurry such as excessive sludge which is discharged from a pig farm and has small differences in specific gravities can be concentrated and which can be installed or disposed easily. CONSTITUTION:A swirling introduction section D comprising a cylindrical interior and a concentration section N connected to the section D whose walls are inclined inwardly to form a taper are provided. When a material to be treated in the form of slurry is supplied into the section D in a direction tangential thereto, the liquid in the material is concentrated from the upper part of the section D and discharged therefrom, while the solid component therein is concentrated from the lower part of the section N and discharged therefrom. By such arrangement a device is constituted, wherein the section N is tapered in the range of 5 deg.-10 deg. and at least the exterior shape of the section N is formed into polygons.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention comprises a swirl introducing part having a cylindrical inside, and a concentrating part which is continuous with the swirl introducing part and is tapered to form a slurry. When the processed material is tangentially supplied to the swirl introducing section, the liquid in the processed object is concentrated and discharged from above the swirl introducing section, and the solid component in the processed object is discharged from below the concentrating section. Concentrators.

[0002]

2. Description of the Related Art A liquid cyclone as a classifier for fine particles, a collector, a refiner, a concentrator, etc. is well known in the art without mentioning the name of the literature, and is generally compressed into a cylindrical portion and a taper shape. It is formed from the through-cone part. The taper angle of the cone portion of the cyclone is selected to be 12 degrees or more. Therefore, when a slurry of an object to be treated, for example, a mineral, is tangentially supplied to the cylindrical portion, the slurry swirls in the cone portion, and due to the difference in centrifugal force, the relatively fine minerals are oscillated from above the cylindrical portion. -The relatively coarse minerals are separated and discharged as underflow from below the cone portion. Concentration can also be performed by such a separation operation. In addition, a concentration method in which the object to be treated is supplied to the filter filter to separate the object to be treated from the water with the filter, and the separated solid matter is taken out as a cake,
Furthermore, a method is also known in which the substance to be treated is placed in a settling tank, and the substance to be treated is precipitated by gravity and concentrated.

[0003]

As described above, a liquid cyclone, a filtration filter, a settling tank, etc. are known as the concentrating device, but the liquid cyclone is advantageous from the viewpoint of equipment cost, installation space, operability and the like. is there. Therefore, a liquid cyclone is often used for concentrating the processed material having a large specific gravity. By the way, recently, the treatment of surplus sludge generated from activated sludge in the treatment plant of a pig farm has become a problem. Excess sludge needs to be concentrated and treated appropriately, but since the specific gravity of the activated sludge precipitate is as small as about 1.0, it is difficult to concentrate it in a sedimentation tank. In addition, if it is attempted to concentrate with a filter filter, the cost becomes high, and there is the problem of odor, which makes hygiene management difficult. Therefore, it is conceivable to concentrate using a liquid cyclone, which is advantageous from the viewpoint of equipment cost, installation space, operability, etc. However, since the conventional liquid cyclone has the taper angle of the cone portion selected to be 12 degrees or more, When the target is a mineral with a large difference in specific gravity, it is easy to separate or concentrate and there is no particular problem, but it is a slurry with a small difference in specific gravity such as excess sludge discharged from a pig farm. Has the drawback that it cannot be concentrated. In some cases, it is necessary to operate multiple liquid cyclones in parallel due to the throughput, but conventional cyclones have circular outer shapes, making it difficult to install them for parallel operation. The layout or layout was complicated, and the appearance was impaired. Therefore, an object of the invention of claim 1 is to provide a concentrator capable of concentrating slurry having a small difference in specific gravity such as excess sludge discharged from a pig farm, and the invention of claim 2 is a pig farm. It is an object of the present invention to provide a concentrator that can concentrate a slurry having a small difference in specific gravity, such as excess sludge discharged from a plant, and that can be easily installed or arranged.

[0004]

The invention according to claim 1 is
In order to achieve the above-mentioned object, a swirl introducing part having a cylindrical inside, and a concentrating part which is continuous with the swirl introducing part and is tapered to form a slurry-like object to be treated. When supplied tangentially to the swirl introduction part, the liquid in the object to be treated is concentrated and discharged from above the swirl introduction part, and the solid component in the object to be treated is concentrated and discharged from below the concentration part. In the device, the taper angle of the concentrating portion is 5 to
It is selected in the range of 10 degrees. Further, the invention according to claim 2 comprises a swirl introducing part having a cylindrical inside, and a concentrating part which is continuous with the swirl introducing part and is tapered to form a slurry-like object to be treated. When supplied tangentially to the swirl introduction part, the liquid in the object to be treated is from above the swirl introduction part,
Then, in the apparatus in which the solid component in the object to be treated is concentrated and discharged from below the concentration section, the taper angle of the concentration section is selected within the range of 5 to 10 degrees, At least the planar outline of the concentrating portion is formed in a polygonal shape.

[0005]

According to the invention described in claim 1, the concentrator body is installed in the conventional manner so that the direction of the concentrating portion is vertical,
Excess sludge in the form of a slurry, which is the object to be treated, for example, from a pig farm is tangentially supplied to the swirl introduction section. Then,
Excess sludge is swirled in the thickening section, liquid is discharged from above the swirl introduction section as overflow, and sludge is concentrated from below the thickening section and discharged as underflow. According to the second aspect of the present invention, the planar outer shape of the concentrating portion is formed in a polygonal shape. Therefore, as many concentrators as necessary are put together so that the polygonal surfaces are in contact with each other, and the concentric portion is also vertically arranged. To install. Then, depending on whether the concentrated or bundled concentrators are operated in parallel or in series, appropriate pipes are provided, and the slurry-like excess sludge from the pig farm, which is the object to be treated, is bundled into each swirl introduction section. Supply tangentially to. Then, the excess sludge swirls in the thickening section, the liquid is discharged as an overflow from above the swirl introduction section, and the sludge is concentrated as a underflow from below the thickening section.

[0006]

EXAMPLE One example of the present invention will be described below. Referring now to FIG. 1, the concentrator S of the illustrated embodiment is
Hollow rectangular main body H formed from four surfaces 1 to 4
It is easily understood that the main body H is composed of a feed portion F which is formed integrally with the upper portion of the main body H at a right angle. Also, at a glance, it can be seen that the upper portion of the main body H is the overflow portion B, the lower portion thereof is the cylindrical swirl introduction portion D, the lower portion thereof is the cone-shaped concentrating portion N, and the lowermost portion is the underflow portion U. To be understood. As shown in FIG. 2, the overflow portion B is formed with a tapered female screw 5 for a pipe. An adapter, which will be described later, is appropriately screwed into the tapered female screw 5. The taper female screw 5 is, for example, PT 11
The effective diameter of / 4 "is 40 mm, and a cylindrical swirl introducing chamber 6 having a diameter of 30 mm is formed below the effective diameter of 40 mm. The swirl introducing chamber 6 is connected to the cone-shaped concentrating chamber 7. The cone-shaped concentrating chamber 7 is composed of tapered walls 8 and 8 and has a gradient whose upper end diameter R is 30 in the illustrated embodiment.
mm, the lower end diameter r is 3 mm, and the axial length L is 15
Since it is 2 mm, it is about 5 degrees. A taper female screw 9 of, for example, PT1 ″ is also formed in the lowermost underflow portion U of the main body H, and a discharge pipe 10 connected to the concentrating chamber 7 is opened in this screw hole.

The feed portion F also has a rectangular outer shape, and a tapered female screw 11 is formed at the end thereof, and a tapered hole 12 and a supply hole 13 are sequentially formed from this screw hole. The supply hole 13 is opened tangentially to the swirl introduction chamber 6 at a position above the center of the swirl introduction chamber 6.

For example, the adapter A applied to the tapered female screw 5 of the overflow portion B of the main body H is shown in FIG.
As shown in (b), the whole has a substantially cylindrical shape, and its upper end portion is formed into a square shape 15 so that a tool such as a wrench fits therein, a middle portion is a circular shape 16, and a lower portion thereof. For example, P
A T 1 1/4 "taper male thread 17 is further formed below the reduced diameter cylindrical portion 18. Inside the adapter A, a taper female thread 19, a taper hole 20, and a straight hole 21 are arranged in this order from above. Is formed in communication with.

Next, the operation of the above embodiment will be described.
The taper screw 17 of the adapter A is replaced with the taper screw 5 of the main body H.
Screw into. Then, straight hole 2 of adapter A
The tip of 1 reaches almost the center of the swirl introducing chamber 6. The taper female threads 11 and 19 of the feed portion F, the adapter A of the overflow portion B, and the underflow portion U, respectively.
Connect to 9. In this pipe, taper female screw 1
Since 1, 19, 9 have the same size, pipes of the same diameter can be applied. Then, for example, excess sludge in the form of slurry is supplied from the feed section F at a predetermined pressure. Then, the excess sludge is tangentially supplied from the supply hole 13 to the swirl introduction chamber 6. The swirl motion is imparted in the swirl introduction chamber 6, and the excess sludge is collected on the wall surface and the liquid is collected in the central portion and sent to the cone-shaped concentrating chamber 7. Since the concentrating chamber 7 has a tapered diameter, the concentrating further proceeds by the swirling motion, the solid portion is discharged from the underflow portion U as underflow, and the liquid is attached to the upper overflow portion B. It is discharged to the outside of the concentrator S as an overflow through the straight hole 21 of A and the tapered hole 20.

The taper angle and supply pressure of the concentrating chamber 7 of the concentrator S having the above-mentioned structure were changed, and the excess sludge from the pig farm having a specific gravity of about 1.0 was tested. The ratio of the underflow density to the density was as follows. Taper angle 5 degrees 7 degrees 8 degrees 10 degrees Supply pressure 4k 2.20 2.00 1.98 1.81 6K 2.40 2.15 2.06 1.95 8K 2.65 2.35 2.14 1. 97 10K 3.00 2.55 2.35 2.15 As a result of the above test, it is found that the smaller the taper angle and the larger the supply pressure (5 degrees, 10 k / cm ² ) are, the higher the enrichment is. However, when the supply pressure increases, the running cost increases, and when the taper angle decreases, the processing amount per unit time decreases. If the degree of enrichment is about twice, there is no practical problem, and a taper angle of 5 to 10 degrees is suitable.

Since the outer shape of the concentrator S according to this embodiment is square, when using a plurality of concentrators 1,
The surfaces 1 to 4 can be combined so that they are in contact with each other as appropriate. Or they can be bundled. An example in which four bundles are bundled is shown in the plan view of FIG. 4A, although only the reference numerals are given and detailed description is not given. If the outer shape is triangular, six can be put together as shown in FIG. When bundled in this way, the overflow section B, the swirl introduction section D, the feed section F, etc. become symmetrical when viewed in a plan view, the piping system is neat, and the installation space is small, and the layout in the factory is easy. There is an effect. In this way, the bundles can be bundled and used as needed.

[0012]

As described above, according to the invention described in claim 1, since the taper angle of the concentrating portion is selected in the range of 5 to 10 degrees, for example, the slurry-like excess sludge from a pig farm is treated. The effect peculiar to the present invention that the slurry having such a small difference in specific gravity can be concentrated can be obtained. Further, according to the invention described in claim 2, in addition to the above-mentioned effect, since the planar outer shape of the concentrating portion is formed in a polygonal shape, a plurality of compact bundles can be bundled so that the polygonal surfaces appropriately contact each other. The effect that can be installed is obtained.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

3A and 3B are views showing an embodiment of the adapter, FIG. 3A is a plan view thereof, and FIG. 3B is a sectional view taken along line YY in FIG.

FIG. 4 is a diagram showing an arrangement example of a concentrator according to the present embodiment,
(A) is a plan view of an example in which four of them are arranged and (B) is arranged in six.

[Explanation of symbols]

 B Overflow part D Swirling introduction part F Feed part N Concentration part S Main body 1-4 Main body surface

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[Procedure amendment]

[Submission date] February 20, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

[0003]

As described above, a liquid cyclone, a filtration filter, a settling tank, etc. are known as the concentrating device, but the liquid cyclone is advantageous from the viewpoint of equipment cost, installation space, operability and the like. is there. Therefore, a liquid cyclone is often used for concentrating the processed products having a large difference in specific gravity.
By the way, recently, treatment of surplus sludge generated from activated sludge treatment in a pig farm treatment plant has become a problem. Excess sludge needs to be concentrated and appropriately treated, but it is difficult to concentrate in a sedimentation tank because the specific gravity of the activated sludge treated precipitate is as small as about 1.0. In addition, when trying to concentrate with a filtration filter, the cost becomes high, and there is the problem of odor, which makes it difficult to maintain hygiene. Therefore, it is conceivable to concentrate using a liquid cyclone, which is advantageous in terms of equipment cost, installation space, operability, etc. However, the conventional liquid cyclone has a taper angle of 12 degrees or more for the cone portion, so it can be treated. If it is a mineral with a large difference in specific gravity, it is easy to separate or concentrate and there is no particular problem, but slurry with a small difference in specific gravity, such as excess sludge discharged from a pig farm, is concentrated. It has the drawback of not being able to. In some cases, it is necessary to operate multiple liquid cyclones in parallel due to the throughput, but conventional cyclones have circular outer shapes, making it difficult to install them for parallel operation. The layout or layout was complicated, and the appearance was impaired. Therefore, an object of the invention of claim 1 is to provide a concentrator capable of concentrating slurry having a small difference in specific gravity such as excess sludge discharged from a pig farm, and the invention of claim 2 is a pig farm. It is an object of the present invention to provide a concentrator that can concentrate a slurry having a small difference in specific gravity such as excess sludge discharged from the plant and can be easily installed or arranged.

Claims (2)

[Claims] 1. A swirl introducing part having a cylindrical inside, and a concentrating part which is continuous with the swirl introducing part and is tapered to form a slurry-like object to be treated. When the liquid is tangentially supplied to the object, the liquid in the object to be processed is concentrated and discharged from above the swirl introduction part, and the solid component in the object to be processed is discharged from the lower part of the concentration part. The concentrator, wherein the taper angle of the concentrating portion is selected in the range of 5 to 10 degrees. 2. A swirl introducing part having a tubular inside, and a concentrating part which is continuous with the swirl introducing part and is tapered to form a slurry-like object to be treated. When the liquid is tangentially supplied to the object, the liquid in the object to be processed is concentrated and discharged from above the swirl introduction part, and the solid component in the object to be processed is discharged from the lower part of the concentration part. The taper angle of the concentrating portion is selected within a range of 5 to 10 degrees, and at least the planar outer shape of the concentrating portion is formed in a polygonal shape.