JP2011005375A - Solid-liquid separator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a compact and inexpensive solid-liquid separator further improving concentration performance of a concentration machine using rotary blades.SOLUTION: The solid-liquid separator includes a water tank 1, a rotary body 3 set in the water tank 1 and provided with a plurality of separation blades 5 with intervals, a driver unit 6 for rotating the rotary body 3, and flow inhibiting rods 10 set in the water tank 1. Sludge is rotated in the same direction as the rotation direction of the separation blades 5 to generate a speed difference between the sludge and flow inhibiting rods 10. Then a water channel is formed near the flow inhibiting rods 10 to promote the solid-liquid separation of raw water, further concentrating the sludge.

Description

  The present invention relates to raw water in which solids such as sludge generated by primary treatment such as clean water, sewage, industrial wastewater, agricultural settlement drainage, or secondary treatment by biological treatment and a separated liquid are mixed with sludge. The present invention relates to a solid-liquid separation device for solid-liquid separation from a liquid.

The methods for solid-liquid separation as described above are generally roughly classified into solid-liquid separation by precipitation (separate recovery) and concentration according to the purpose.
First, solid-liquid separation by precipitation is a method of separating sludge from raw water by allowing the sludge to settle by gravity for raw water in which solids such as sludge and liquid such as a separation liquid are mixed. In this solid-liquid separation by precipitation, there are mainly the following two methods of gravity and mechanical.
The gravity type uses a sedimentation tank, a coagulation sedimentation tank, or the like for sedimenting sludge.
The mechanical type performs processing such as membrane separation and floating separation by normal pressure (pressurization), but usually consumes a lot of energy.

On the other hand, solid-liquid separation by concentration is a method of further concentrating solid sludge, and there are roughly the following two methods of gravity and mechanical as in the case of solid-liquid separation by precipitation described above.
The gravity method is a general method, and is performed using a gravity concentration tank, a coagulation concentration tank, a precipitation tank, or the like. These gravity concentration tanks, coagulation concentration tanks, sedimentation tanks, and the like do not require energy for concentrating the sludge because the sludge is settled by gravity and solid-liquid separated.
The mechanical type includes a centrifugal type, a normal pressure levitation type, a belt type, and the like, and a centrifugal type, that is, a centrifugal separation method is relatively often employed. In this centrifugal separation method, a sludge having a specific gravity greater than 1 is separated by a rotating centrifugal separator, and therefore consumes a lot of energy. The normal pressure levitation type is a method in which a foaming agent is added to raw water, fine bubbles are generated and sludge is floated together with bubbles, and the sludge is separated and concentrated by making the apparent specific gravity of sludge smaller than 1. Is.
The applicant of the present application has developed a new solid-liquid separation device that solves the problems of the existing solid-liquid separation technology described above, and has already filed a patent application (see Patent Document 3).

Japanese Unexamined Patent Publication No. 2007-105596 JP 2009-28665 A JP 2006-263670 A

The solid-liquid separation technique described above has the following problems.
(1) The gravity type has the advantage of easy maintenance and low implementation costs, but in response to the difference in the properties of raw water during processing, the properties of sludge and separation liquid obtained after solid-liquid separation are It fluctuates and is not constant. Therefore, processing performance varies depending on the raw water.
Moreover, since the concentration of concentration is relatively low, the amount of sludge generated is large, the disposal cost increases due to an increase in the amount of sludge disposal, and the water treatment system may be adversely affected due to the deterioration of the quality of the separated liquid water.

Furthermore, in order to improve solid-liquid separation performance and concentration performance, when a scraper is installed in a sedimentation basin or gravity concentration tank, a picket fence as a solid-liquid separation promotion means may be added thereto. In the conventional apparatus shown in FIG. 18, a raking machine 102 driven by a driving machine 101 is installed, and a picket fence 100 is attached to the raking machine 102, and the picket fence 100 is usually in a rod shape or an angle shape. , Move in the tank 103 together with the scraper 102. The picket fence 100 in this device slowly moves through the sedimentation basin and the lower part of the gravity concentration tank to form a water path in the concentrated sludge, promotes drainage and increases the concentrated concentration of sludge. . However, the picket fence 100 may cause the sludge to diffuse unless the sludge concentration in the raw water is high.
Furthermore, it does not act on sludge that accumulates above and does not come into contact with the picket fence 100. If the sludge in the settling tank or sedimentation basin does not descend to the position of the picket fence 100, no concentration action occurs.

(2) On the other hand, while the mechanical type has good performance and stable operation, the equipment cost becomes high. In addition, the operation is complicated, and regular maintenance work is required to maintain a good state, and the amount of consumables and energy used is large, so the maintenance cost is relatively expensive. Therefore, a method of adding an amphoteric water-soluble polymer or a water-in-oil amphoteric water-soluble polymer emulsion or the like has been implemented in order to promote sedimentation of sludge in the sedimentation tank and prevent its outflow.

However, if chemicals such as polymers and emulsions are added, the processing costs increase, and sludge and separation liquid contain chemicals, and the amount of sludge generated increases, which may adversely affect the separation liquid treatment.
In view of the above circumstances, it has been strongly desired to provide a solid-liquid separation device that is easy to handle, has good solid-liquid separation performance, and has low equipment costs, maintenance costs, etc. Has developed a solid-liquid separation device according to the prior application (Patent Document 3) and improved the solid-liquid separation performance, especially the concentration performance, but with the aim of further improving the concentration performance, stable solid-liquid separation and downsizing of the device As a result of repeating the test research and repeating improvements and improvements, the solid-liquid separation device according to the present invention has been obtained.

The present invention has been made to solve the above-described problems, and has improved sludge concentration performance compared to a conventional solid-liquid separation device using a picket fence, and is compact and inexpensive solid-liquid separation. An object is to provide an apparatus.
The present invention has the following configuration in order to achieve the object. That is, a water tank, a rotating body disposed in the water tank, and a plurality of separation blades provided at intervals, a driving device for rotating the rotating body, and a baffle rod disposed in the water tank It is characterized by comprising. One or two or more of the baffle bars may be installed.

In the present invention, a water tank (separation tank), a rotating body in which a plurality of strip-like separation blades are disposed at intervals in the water tank, a driving device that rotates the rotating body at a low speed, and rotation are generated. Providing a baffle that changes part of the sludge flow has the following effects.
(1) Solid matter in sludge is held inside the rotating body and the separated liquid is discharged to the outside of the rotating body, so that solid-liquid separation, concentration, and sedimentation of raw water are promoted.
(2) The installation of the baffle creates a speed difference between the baffle and the sludge rotating by the rotating body, forming a water channel in the sludge near the baffle, and concentrating the raw water (solid-liquid separation) ) Is promoted, an efficient solid-liquid separation device is provided.
(3) Since a large amount of floc can be held inside the water tank, the installation area and volume of the coagulation / concentration tank are reduced and the whole is made compact, so that the equipment cost is reduced. In addition, since the device structure is simple, the maintenance is easy.

(4) Since the concentration promoting action by the baffle rod occurs, the rotational speed of the rotating body can be lowered and the energy consumption of the apparatus is reduced as compared with the case where only the rotating body is installed. Moreover, since the sludge concentration efficiency is improved, the load on the rotating body can be increased.
(5) Since it is not necessary to clean the apparatus, it is not necessary to provide a separate cleaning facility.
(6) Efficient treatment is possible by rotating the rotating body at a low speed even for sludge that has become filamentous bulking due to the growth of filamentous bacteria and has deteriorated sedimentation.
(7) Since the structure is simple compared to the mechanical type, troubles do not easily occur and stable solid-liquid separation and sludge concentration can be performed.
(8) A high-concentration concentrate can be obtained even when sewage is settled without using a flocculant (hereinafter referred to as “no chemical injection”), eliminating the need for additional equipment and maintenance costs associated with the addition of chemicals. No increase in sludge generation or adverse effects of chemical addition.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a schematic diagram showing a basic structure of a solid-liquid separation device according to the present invention. This apparatus can be used for solid-liquid separation of sludge generated in primary treatment such as clean water, sewage, industrial wastewater, agricultural settlement wastewater, and secondary treatment after biological treatment. This solid-liquid separation device includes a water tank 1, and raw water containing, for example, excess sewage sludge flows into the water tank 1 through an inflow pipe 2. And the cylindrical rotary body 3 for accelerating | stimulating the solid-liquid separation of raw | natural water is arrange | positioned inside the water tank 1. FIG. The water tank 1 can be used as, for example, a final sedimentation tank of an existing sewage treatment facility, but is not limited to this as long as it is a liquid tank that separates solids such as sludge and separated liquid. The raw water includes sewage containing sludge or floc that is agglomerated sludge and into which a chemical solution for promoting flocculation is injected. As the chemical solution, a polymer flocculant, an inorganic flocculant, or a mixture thereof can be used. As the inorganic flocculant, polyiron chloride, PAC, or the like can be used.

  The planar shape of the water tank 1 can be formed into a circular shape, a rectangular shape, a polygonal shape, or the like, but in the first embodiment, it is circular. This water tank 1 is located at the uppermost part, and has the largest straight cylindrical large-diameter straight portion 1a, a funnel-shaped tapered portion 1b that narrows downward from the lower end of the large-diameter straight portion 1a, and this tapered portion 1b. A concave small-diameter straight portion 1c extending downward from the lower end of the lower end, and a bottom wall 1d extending horizontally from the lower end of the small-diameter straight portion 1c.

A reaction portion 15 is formed by the entire large-diameter straight portion 1a and the substantially upper half of the taper portion 1b, and the rotating body 3 is disposed in the reaction portion 15. A precipitation portion 16 is formed by the substantially lower half of the taper portion 1b and the entire small-diameter straight portion 1c to accommodate the settled sludge. And the sludge discharge pipe 4 is connected to the lower part of the small diameter straight part 1c, and the inflow pipe 2 is connected to the upper part of the large diameter straight part 1a. The upper reinforcing band 3a of the rotator 3 is substantially coincident with the water surface.
Moreover, the sludge settled in the sedimentation part 16 can be discharged | emitted by a natural flow system, or can be forcedly discharged | emitted by the sludge pump, screw pump, etc. which are not shown in figure. Although the inclination angle of the taper portion 1b can be set to about 30 to 70 degrees, it is usually preferably about 60 degrees.

The inflow pipe 2 is provided with a main body 2a occupying most of the inflow pipe 2 and a vertical portion 2b through which raw water flows out vertically downward at the end of the main body 2a, and the lower end of the vertical portion 2b is opened. . Although this opening portion can be located anywhere in the water tank 1, it is possible to allow the floc to flow into the rotator 3, but it is preferable to locate this inside the rotator 3. In this example, a funnel-shaped feed pipe 2 c that receives the opening of the inflow pipe 2 is installed in the rotating body 3 to supply raw water to the center of the rotating body 3. In this way, the water tank 1 can be guided from above, but the large diameter straight part 1a or the taper part 1b of the water tank 1 can be guided therethrough. And when the opening part of the inflow pipe 2 opens in the rotary body 3, the distance of the opening part of the inflow pipe 2 and the separation blade 5 of the rotary body 3 is set to L1, and the opening part of the inflow pipe 2 and the water surface of raw | natural water Is set to L1> L2, it becomes easier to hold the floc inside the rotator 3. In addition, raw | natural water can be made to flow in intermittently or continuously.

(Rotating body)
The rotating body 3 having the separation blade 5 is slowly rotated at a low speed by an upper driving machine (motor) 6. The drive unit 6 may be a mechanical type, but may be rotated by natural flow energy that flows raw water into the rotator 3 under natural flow. The rotating body 3 is configured to rotate the raw water inside and outside the rotating body 3 in principle, but is configured so as not to let the floc flow outside, and is installed at the center of the rotating body 3 with the axis line in the vertical direction. The shaft 8, the upper reinforcing band 3 a attached to the rotating shaft 8, a plurality of (for example, 30) separating blades 5 each supported at the upper edge by the inner peripheral edge thereof, and the rotating shaft 8 being driven to rotate It is comprised by drive means, such as the drive device 6 and the reducer which is not shown in figure.

  FIG. 2 is a diagram illustrating an installation state of the separation blade 5 in the rotating body 3. As shown in the drawing, a plurality of separation blades 5 are arranged adjacent to each other on the same circumference at a predetermined interval, and the gap between adjacent separation blades 5, 5 is a slit 7 that is elongated in the vertical direction. . However, the shapes of the separation blade 5 and the slit 7 may be different depending on the size, material, and the like of the rotating body 3. Although the material of the said rotary body 3 is not specifically limited, The said isolation | separation blade | wing 5 can be formed with steel, stainless steel, a plastic, a vinyl chloride etc., for example.

  Each of the separation blades 5 has a strip shape as shown in FIG. 1, while its horizontal cross-sectional shape is a "<" shape as shown in FIG. Each of the separation blades 5 has one first short side 5a and another second short side 5b each having a predetermined width folded at a bent portion 5c. In the illustrated example, the intersection angle between these short sides is The obtuse angle is, for example, 150 degrees (30 degrees with respect to the tangent line).

  In addition, the 2nd short side 5b is arrange | positioned along the tangent direction within the circular rotary body 3, As a result, the 1st short side 5a is orient | assigned to the internal direction of the rotary body. And among the separation blades 5 adjacent to each other, the distance S between the end portion of the first short side 5a of one separation blade 5 and the bent portion 5c of the other separation blade 5 is made the same length, The distance between the end of the first short side 5a of the separation blade and the end of the second short side 5b of the other separation blade, that is, the width of the slit 7 is arranged to be the same.

In this example, the interval S and the slit 7 are made to coincide with each other in all the separation blades 5 and 5, but they do not necessarily have to be provided at equal intervals. These may be random length intervals S or slits 7 and may be the same interval or length every other one.
If the connection position of the separating blade 5 with respect to the upper reinforcing band 3a can be adjusted, the width of the slit 7 can be adjusted from above the water surface according to the number of rotations of the rotating body 3.

  In addition, when the separation liquid obtained by the solid-liquid separation flows out to the separation liquid pipe 17, the rotation speed of the rotating body 3 is set to be higher than the outflow speed of the treated water in order to prevent flocs from being accompanied. It is necessary to control and push the floc back to the center of the rotating body 3 as much as possible by contacting the inner surface of the separation blade 5. And the horizontal cross-sectional area of the water tank 1 in the outer side of the rotary body 3, ie, the area of the water tank outflow part 19, is determined by the rising speed of the treated water in the outer side of the rotary body 3. Therefore, it is necessary to control the rising speed V3 of the treated water to be smaller than the outflow speed V2 from the treated water separation blade (V3 <V2).

Further, the rotational speed of the rotating body 3 needs to be determined in consideration of the relationship between the diameter of the water tank 1, the diameter of the rotating body 3, the viscosity of sludge, etc., and the balance between them. It is preferably about 1 to 10 m. That is, the rotational speed of the rotating body is preferably 60 revolutions / minute or less, and is preferably a low speed of about 1 to 10 revolutions / minute.
According to the rotating body 3, the separated liquid in the sludge flows out through the slits 7, and solids such as floc are held in the rotating body 3, so that sludge solid-liquid separation, concentration, and sedimentation are efficient. To be done.

(Barrier)
Further, in the apparatus shown in FIGS. 1 and 2, the two baffle rods 10 and 10 are installed in the vertical direction at the tip of the support 18 fixed inside the water tank 1. That is, an example in which two baffle rods 10 and 10 are fixed inside the water tank 1 is shown. When the baffle rods 10 and 10 are provided in a stopped state inside the rotating body 3 as in this example, a speed difference is generated between the sludge moving along with the rotation of the rotating body 3 and the baffle rod 10. Then, the sludge collides with the baffle rod 10 and the sludge is easily concentrated.

The action of the baffle 10 is as follows.
First, raw water in which a solid and a liquid such as a separation liquid are mixed is sent to an inflow pipe 2 provided in the central portion of the rotating body 3 by a pump or the like, and the central portion of the water tank 1 through a feed pipe 2c. It is thrown into. The funnel-shaped feed pipe 2c is provided to reduce the flow rate of the raw water and stabilize the water flow. The rotating body 3 rotates at a peripheral speed at a low speed of 1 to 2 m per minute, and raw water is poured into the rotating body 3.
Next, as shown in FIG. 2, in the initial stage when raw water begins to flow into the solid-liquid separator, the sludge begins to rotate slowly inside the rotating body 3 provided with the baffle 10 inside, and gradually. The sludge is dispersed in the periphery and the sludge comes into contact with the separation blade 5. The separation blade 5 is bent in a “<” shape and has a shape that can easily hold sludge in the raw water. Therefore, sludge is collected inside the rotating body 3 and concentrated, and settles in the settling portion 16 of the water tank 1.

  FIG. 3 shows a state where the inflow of raw water has progressed and the sludge X is held inside the separating blade 5 of the rotating body. Due to the rotation and dispersion of the sludge and the shape of the separation blade 5, the sludge X is concentrated inside the rotating body 3. The sludge X in the raw water rotates gently in the same direction as the separation blade 5, but the baffle 10 is fixed without moving, so that it contacts the moving sludge X layer as shown in FIG. 4. To do. As a result, the baffle rod 10 promotes the aggregating action of sludge particles and makes the sludge flocs larger to improve the sedimentation property.

In addition, as shown in FIG. 5, by physically dividing the sludge layer and creating a water channel Y, the water in the surrounding sludge gathers in the water channel Y, and solid-liquid separation is promoted. By accelerating the transition to the consolidation process, it is possible to increase the concentration of concentrated sludge. The concentrated sludge settles in the lower part of the water tank 1, is consolidated and further concentrated. The separation liquid passes between the separation blades 5 (slit 7) and is discharged out of the system from the treated water pipe 17 due to overflow.
Although the baffle rod 10 has a simple structure, it has a great effect in solid-liquid separation based on the above-described action.

Hereinafter, the blocking rod will be described in more detail.
Usually, it is desirable to install a plurality of baffle rods in the solid-liquid separator. The effective number of installations varies depending on the scale of the apparatus, but generally, the installation interval of the baffle rods is appropriately about 100 to 400 mm, and the number of installations can be determined based on this. For example, as shown in FIG. 6, it can be installed around the rotary shaft 8 inside the separation blade 5. In FIG. 6A, two baffle rods 10 are provided point-symmetrically around the rotation shaft 8. In FIG. 6B, three baffle rods 10 are provided around the rotation shaft 8, and in FIG. 6C, four baffle rods are provided. In FIG. 6 (d), four are provided in a bilaterally asymmetric manner around the rotation shaft 8.

Further, as shown in FIG. 7A, the baffle rod 10 can be provided on a concentric circle around the rotation shaft 8 of the separation blade 5 or at a different radial position.
Furthermore, as shown in FIG. 7 (b), it can be provided only on the outside of the separation blade 5, or as shown in FIG. 7 (c), it can be provided both on the inside and outside of the separation blade 5. .
As described above, the baffle rod 10 may be provided on the concentric circle inside the rotating body 3 or may be provided at a position not on the concentric circle. These baffles 10 are preferably installed in the rotating body 3, but can also be installed outside the rotating body 3, and further installed both inside and outside the rotating body 3. May be. As described above, the installation position of the baffle 10 is not particularly limited in the water tank.

The shape of the baffle rod 10 is preferably a rod shape with a circular cross-sectional shape and a diameter of about 50 to 100 mm. However, it may be an elliptical bar, a square bar, a triangular bar, a rhombus bar, a round bar with holes, or the like, and may have any shape as long as the sludge water channel Y can be formed. The diameter of the baffle 10 may be uniform or different as a whole, and the cross-sectional shape may be partially different. Further, the cross-sectional shape may be a square shape or a pipe shape. The overall shape may not be a rod shape, but may be a wire or chain shape, a shape having a curved portion, or a shape having an inclined portion. The diameter may be outside the above range depending on the size, shape, and number of water tanks and rotating bodies. That is, the desired effect can be expected if it is long as a whole.
The baffle rod 10 is not limited to being installed in the stopped state as described above, and may be in a movable state.

Next, a modification aspect is shown in FIG. 8 about installation of the baffle 10 with respect to the rotary body 3. FIG.
8A and 8B show the baffle rod 10 fixed to the bottom of the water tank 1 at the lower end. 8C and 8D show a state in which the upper end of the baffle rod 10 is fixed to a support body 52 provided on the upper part of the water tank 1 and is suspended in the rotating body 3. In the apparatus shown in FIGS. 8A, 8B, 8C, and 8D, the baffle rod 10 is fixed and installed inside the rotating body 3. FIG. In addition, the fixing position of the baffle rod 10 may be the side surface, the bottom portion or the like of the rotator 3. However, in the structure in which the baffle rod 10 is suspended as shown in FIGS. The removal of the flow stick 10 and the change of the installation position are easy, and appropriate installation suitable for the state of sludge becomes possible.

(Other embodiments)
Hereinafter, other embodiments of the solid-liquid separator provided with the baffle will be described. In addition, since the part which attached | subjected the code | symbol same as the solid-liquid separator mentioned above shows the same member, description is abbreviate | omitted.
FIG. 9 shows an example in which three left and right baffle bars 10 are installed along the vertical direction at the tip of a support 18 fixed to the left and right inner sides in the gravity concentration tank 50. This is an example in which the baffle 10 is fixedly installed. A rotatable sludge scraper 51 is provided at the bottom of the water tank 1.
The above-described apparatus provided with the baffle 10 can be used for any solid-liquid separation, such as agglomeration concentration using a flocculant or a normal sedimentation basin, in addition to concentration without chemical injection.

  FIG. 10 shows details of an example in which the baffle rod 10 is fixed to a support body 52 provided at the upper part of the water tank 1 and is suspended in the rotating body 3. Here, two left and right baffle rods 10 are held vertically suspended at the bottom of a support 52 provided with a driving device 6 as a motor on the upper surface. In addition, a plurality of picket fences 53 that are erected vertically upward are attached to a raking machine 51 that is rotatably provided at the bottom of the water tank 1. The picket fence 53 is mainly used in a sedimentation basin or a gravity concentration tank, and rotates together with the scraper 51 and the separation blade 5.

  On the other hand, the baffle 10 is similar in shape to the picket fence 53 as described above. However, the major difference between the two is that the baffle 10 stops in the water tank 50 and forms a water channel Y with the sludge rotating together with the rotating body 3, whereas the picket fence 53 scrapes the sludge. It is a point which rotates with the machine 51 and the separation blade 5 and forms a water channel with the sludge which is almost stationary.

Next, in a water tank 50 including a rotating body 3 in which a plurality of strip-shaped separation blades are arranged at a predetermined interval as shown in FIG. 10 and a drive unit 6 that rotates the rotating body 3 at a low speed. The function and effect of the baffle rod in the apparatus provided with the picket fence 53 will be described.
As described above, the separation blades of the rotating body 3 have a shape that can easily hold sludge inside. When the rotator 3 rotates gently, sludge and water inside the rotator 3 rotate uniformly at a slightly lower speed than the separating blade 5 (FIGS. 2 and 3). Although the picket fence 53 is installed in the sludge scraper 51, since the drive unit 6 is one, the rotating body 3 is integrated with the scraper 51, and the rotating body 3 and the picket fence 53 rotate at the same speed. Become.

When the picket fence 53 is installed in the rotating body 3, sludge and water also rotate, so that the speed difference between them and the picket fence 53 is reduced, and a phenomenon in which the picket fence 53 is circulated inside is observed. This phenomenon is remarkable when the concentration is high or the separation blade diameter is small. The picket fence 53 originally creates a water channel in the sludge and promotes water drainage from the sludge to increase the concentration concentration. However, with this apparatus, the original effect of the picket fence is unlikely to occur.
In such a case, if the baffle 10 is installed, a water channel is easily formed in the sludge, the concentration of the sludge is promoted, and efficient solid-liquid separation can be performed.

FIG. 11 shows a device in which the upper end of the baffle rod 10 is fixed to a support body 52 provided at the upper part of the water tank 50 and is suspended in the rotating body 3. Not provided.
10 and 11, the baffle rod 10 is fixed and does not move. However, the baffle rod 10 may be installed so as to rotate at a speed different from that of the rotating body 3.
FIG. 12 shows a device in which the baffle rod 10 can be rotated by using a drive motor 9 different from the drive machine 6 that rotationally drives the scraper 51. In this apparatus, the rotating body 3, the scraper 51, and the baffle rod 10 rotate independently, and the inflow pipe 2 that supplies raw water into the water tank 50 is also provided on the bottom side so as to penetrate the water tank 1. The raw water is jetted upward in the water tank 1.

Next, FIG.13 and FIG.14 is a side view of the solid-liquid separation apparatus installed so that a baffle rod may be fixed in a rectangular comparatively large sedimentation basin. In the apparatus shown in FIG. 13, the baffle rod 10 is fixed inside the rotating body 3 provided in the front stage of the rectangular sedimentation basin 55 so as to be suspended from the sedimentation basin slab 57. On the bottom of the support body 52 that supports the drive unit 6 on the upper surface, two left and right baffle bars 10 are held so as to reach the inside of the rotating body 3 while being suspended vertically.
On the other hand, in the apparatus shown in FIG. 14, it installs so that the baffle rod fixed to the support part 18 provided in the side surface of a sedimentation basin may be inserted to the inside of the rotary body 3 provided in the front | former stage of the rectangular sedimentation basin. .

In the apparatus shown in FIG. 13 and FIG. 14, a known link belt type sludge squeezer 54 is installed downstream of the settling basin. The installation of the baffle rod 10 is also effective in a large-scale water tank having such a quadrilateral and trapezoidal shape.
15 and 16 show an apparatus having a structure in which three rotary bodies 3 are arranged in a rectangular sedimentation basin 55. FIG. 15 is a plan view thereof, FIG. 16 is a side view thereof, and FIG. is there. In the apparatus having such a structure, since the baffle rod 10 is installed so as to reach the inside of each rotating body 3, three sides corresponding to the position of each rotating body 3 on the side surface of the settling basin are provided. Support portions 56 are provided, and the baffle rod 10 is attached to each. As a result, the baffle rod 10 extends vertically from below and reaches each rotary body 3. However, the installation method of the baffle rod is not limited to this, and may be fixed to the bottom surface or the like. In FIG. 17, a plurality of rotating bodies are provided in a rectangular sedimentation basin, a support portion 18 is provided on a side surface of the rectangular water tank 55, and the baffle rod 10 is attached to the support portion 18. The device installed to be inserted is shown. At the bottom of the water tank 55, a scraper 51 is installed. In this apparatus, the rotating body 3 is held in a suspended state by the holding portion 59 placed on the installation surface of the water tank 55.

The raw water supplied from the inflow pipe 2 flows into the respective rotators 3 via the branch pipes 58 branched from the inflow pipe 2.
Moreover, in this apparatus, the sludge scraper 51 is installed in the back | latter stage (slope part) of the rectangular sedimentation basin 55. FIG. In addition, the reciprocating-type sludge scraper 51 is installed as a thing of the type which can be accommodated in the downward direction on the relationship that the some rotary body 3 is provided and the rotary body 3 exists also in the said back | latter stage. However, the type and structure of the raking machine are not limited as long as they can be installed below the plurality of rotating bodies 3. For example, a cascade-type sludge squeezer combining a sludge squeezing mechanism and a reciprocating mechanism by flight may be used.
Even in a large-scale water tank as described above, the installation of the baffle rod 10 is effective.
As another example, when a scraper or a scum clearance that is rotationally driven at a speed different from that of the separation blade 5 is provided, a baffle may be attached to these.

The solid-liquid separator described in the above embodiment has the following advantages.
About the concentration action of the sludge by the rotary body 3, the concentration promotion action by the baffle rod 10 is added synergistically, and efficient sludge concentration is implement | achieved.
A large amount of floc can be held inside the separation blade 5, and the installation area and volume are reduced as compared with the conventional coagulation concentration tank, and the whole is made compact, so that the equipment cost can be reduced. Further, since the structure is simple, there are few replacement parts, and maintenance management becomes easy. The sludge to be treated is, for example, surplus sludge generated from sewage, industrial wastewater, etc., and a concentrated concentration of 1.5% to 4.0% is obtained, and SS (suspended solids) recovery rate Is 95% or more.
Further, by setting the rotational speed of the rotating body 3 to 60 revolutions / minute or less, energy consumption is reduced, and measures for noise and vibration are not required. Moreover, since the sludge concentration efficiency is improved, the load on the water tank is also improved.

Compared with the conventional mechanical atmospheric pressure flotation concentration method, the same SS recovery rate (98% or more) can be obtained even if the drug injection rate is lowered. As an example of the concentration performance, when the SS concentration of the raw water is 0.6%, the SS concentration of the discharged sludge is 2% or more. By rotating the rotating body 3 at a low speed, there is an effect of entanglement of filamentous bacteria.
Since the device is simpler than the mechanical type, troubles in the device are unlikely to occur, and stable separation liquid and sludge can always be concentrated.
Since a concentrated solution with a high concentration can be obtained without chemicals, no additional equipment and maintenance costs associated with the addition of chemicals are required, and there is no increase in sludge generation or adverse effects of chemical additions.

The effect of installing the baffle 10 is as follows.
It has been found that if a baffle rod is installed against sludge or the like that has deteriorated in sedimentation due to filamentous bulking, the sedimentation is further improved as compared with the case of the rotating body 3 alone.
Even if a sludge scraper equipped with a picket fence is installed in the aquarium 1, the sludge in the rotating body 3 is circulating, so a water channel cannot be formed, but when a baffle 10 is installed, Since a rotational speed difference is generated between the rotating body 3 and the baffle rod 10, the concentrated sludge can be further concentrated.
It has been found that the baffle rod 10 has a high sludge concentration effect even if the number of the baffle rods 10 is smaller than that of the picket fence. In addition, the picket fence is installed in the lower part of the water tank 1 where the sludge interface can be maintained. However, since the baffle rod 10 can be installed in the upper part of the water tank, the sludge interface can be maintained high by the separating blade. It is possible to exert a concentration effect on the whole, and it is possible to concentrate for a long time.

Hereinafter, the Example which applied the baffle for sludge concentration is described.
For surplus sludge from agricultural settlement wastewater treatment facilities, using a device with a rotating body diameter of 1000 mm, a water tank diameter of 1200 mm, and a water tank volume of 1.8 m ³ , a treatment volume of 0.3 m ³ / h and a rotating body rotation speed of 0.5 / min. The performance was investigated.
The inflow sludge concentration is about 0.6% TS and about 80% VTS.
In the investigation, a stainless steel round bar with a diameter of 10 mm was used as a baffle bar, and the performance was compared by installing it inside the device under the following conditions. Based on "no baffle", the "suspended type" rotating at the same speed as the rotating body and the "side fixed type" fixed in the tank were compared and compared.

濃縮性能は、阻流棒の設置により、若干ＳＳ回収率が悪くなるが、濃縮濃度は高濃度となり、性能が向上する。阻流棒の設置方法は、回転体と速度差がある方が高濃度となる傾向を示す。
このことから、回転体内部に阻流棒を設置することで濃縮性能が向上し、特に、回転体との回転速度差が大きい場合に効果が大きくなることが認められる。

As for the concentration performance, the SS recovery rate is slightly deteriorated by the installation of the baffle rod, but the concentration concentration becomes high and the performance is improved. As for the installation method of the baffle rod, there is a tendency that the concentration is higher when there is a speed difference from the rotating body.
From this fact, it is recognized that the concentration performance is improved by installing the baffle rod inside the rotating body, and the effect is enhanced particularly when the rotational speed difference from the rotating body is large.

It is the schematic which shows the basic structure of the solid-liquid separator which concerns on this invention. It is a figure which shows the structure of the separation blade in a rotary body. It is a figure which shows the state by which the sludge was hold | maintained inside the separation blade of a rotary body. It is a figure which shows the state which a baffle stick contacts with the layer of the sludge which moves, and produces a speed difference in sludge. It is a figure which shows the state in which a water path is formed in sludge by a baffle stick. It is a figure which shows the example of the number of installation of a baffle rod. (A) shows a state where two baffle bars are provided around the rotation axis, and (b) shows a state where three baffle bars are provided around the rotation axis. (C) shows a state in which four are provided around the rotating shaft, and (d) shows a state in which four are provided in a bilaterally asymmetric manner around the rotating shaft. It is a figure which shows the example of the installation position of a baffle. (A) shows the state which provided the baffle rod centering on the rotating shaft, (b) shows the state provided in the outer side of the separation blade, and (c) shows the inner side and the outer side of the separation blade. The state provided in both is shown. It is a figure which shows the deformation | transformation aspect of installation of the blocking bar with respect to a rotary body, (a) is a bottom view which shows the outline of the apparatus which installed the blocking bar in the bottom part of a rotary body, (b) is the side view. is there. (C) is the bottom view which shows the outline of the apparatus which suspended and installed the baffle from the support body separately provided in the upper part of the rotary body, (d) is the side view. It is a figure which shows the apparatus which fixed the lower end of the baffle rod to the support body provided in the side surface of the water tank. It is a figure which shows the apparatus which fixed the upper end of the baffle rod to the support body provided in the upper part of the water tank, suspended in the rotary body, and provided the picket fence. It is a figure which shows the apparatus which fixed the upper end of the baffle rod to the support body provided in the upper part of the water tank, and was suspended in the rotary body. It is a figure which shows the apparatus which enabled the baffle rod to rotate with the drive body different from the drive machine which rotationally drives a rotary body. It is a side view which shows the solid-liquid separator which installed the baffle rod in the rectangular sedimentation basin. It is a side view which shows another example of the solid-liquid separator which installed the baffle rod in the rectangular sedimentation basin. It is a top view of the apparatus of the structure which has arrange | positioned the three rotary bodies to the rectangular sedimentation basin. It is a side view of the apparatus shown in FIG. It is sectional drawing of the apparatus shown in FIG. It is a figure which shows the example of the conventional solid-liquid separator.

1, 50, 55 Water tank 1a Large diameter straight portion 1b Tapered portion 1b
1c Small-diameter straight part 1d Bottom wall 2 Inflow pipe 2a Main body 2b Vertical part 3 Rotating body 3a Upper reinforcement band 3b Lower reinforcement band 4 Sludge discharge pipe 5 Separation blade 5a First short side 5b Second short side 5c Bending part 6 Driving machine ( motor)
7 Slit 8 Rotating shaft 9 Drive motor 10 Baffle 15 Reaction section 16 Sedimentation section 17 Separation liquid pipe 18 Support 19 Water tank outflow section 51 Scraper 52 Support 53 Picket fence 56 Support section 57 Sedimentation basin slab 58 Branch pipe 59 Holding section

Claims (2)

A tank,
Disposed in the aquarium,
A rotating body having a plurality of separation blades provided at intervals;
A drive for rotating the rotating body;
A solid-liquid separator comprising a baffle disposed in the water tank. The solid-liquid separator according to claim 1, wherein one or two or more baffle rods are provided.

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