JP3505616B2 - Extrusion molding method of organic sludge - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an extrusion molding method of sewage sludge generated in sewage treatment equipment, purified water sludge generated in water purification equipment, organic sludge such as human waste, livestock excrement and activated sludge. In particular, the present invention relates to an extrusion molding method for organic sludge, which enhances the shape retention and physical strength of a sludge molding obtained by extrusion molding of organic sludge.

[0002]

2. Description of the Related Art In recent years, interest in environmental problems has increased, and many attempts have been made to reuse organic sludge. For example, a method is known in which the organic sludge is dehydrated, the dehydrated organic sludge is formed into granular pellets, and the granular pellets are dried and carbonized (for example, JP-A-7-8936).
JP-A-8-299992, JP-A-9-24101
No. 5, JP 10-57990, and JP 10
-87312). It was also known that the carbonized sintered body obtained from the organic sludge by this treatment method is effectively used as a water quality improving agent (purifying material), a soil improving agent, and the like.

In any of these treatment methods, a sludge molded body of granular pellets is molded in the molding step, and thereafter,
The sludge compact is dried in a rotary drying furnace equipped with a rotary furnace or a rotary kiln and then carbonized and sintered.Therefore, the sludge compact is always processed in a dynamic state during the drying and carbonization and sintering processes. It was

Accordingly, when the sludge compacts collide with each other or collide with the furnace body during the steps of drying and carbonization sintering, the carbonized sintered compact obtained is in the form of pellets, but retains the form at the time of molding. In addition, it was impossible to avoid the formation of small pellets of about 10 to 20 mm in general, and it was not possible to obtain a large carbonized sintered body.

Moreover, since the carbonized and sintered body is a relatively small granular pellet, when it is used as a water quality improving agent,
Handling restrictions were imposed depending on the form of the carbonized sintered body.

Therefore, the inventor tried to obtain a carbonized sintered body in a desired form according to the use of the carbonized sintered body, and the water content was 3
Extruding 0 to 50% of organic sludge to obtain a sludge molding,
A method for treating organic sludge has been established in which a sludge molded body is dried so as to maintain its shape, and the dried sludge molded body is carbonized and sintered to obtain a carbonized sintered body in a desired shape.

In this treatment method, in order to further increase the effective surface area of the carbonized sintered body, a cylindrical carbonized sintered body having a relatively thin wall was used as the final product. Therefore, in order to obtain a cylindrical carbonized / sintered body having a relatively thin wall, it was first necessary to obtain a sludge molded body having a shape following the shape of the carbonized / sintered body.

In order to obtain a thin-walled cylindrical sludge molding by extrusion molding, for example, an extrusion molding machine 100 as shown in FIG. 5 is adopted, but the conventional extrusion molding machine 10 is used.
When the sludge molded body obtained by extrusion molding with 0 is dried and carbonized and sintered, cracks reaching the inner and outer diameter surfaces of the sludge molded body are inevitable, shape retention is not maintained, and physical strength However, there is a problem in that it cannot be applied to the application depending on the form of the carbonized sintered body.

That is, the extrusion molding machine 100 relating to the conventional extrusion molding has an extrusion screw in a main body 102 of the extrusion molding machine.
104 is provided, and a freely rotatable inner diameter die 110 is provided at the tip of the extrusion screw 104 and the discharge port 11 of the extrusion molding machine 100.
It was the structure provided between the two. The inner diameter mouthpiece 110 was supported by the extruder body through the support member 108 attached to the extruder body 102.

Although the extrusion molding machine 100 described above can obtain a sludge molding having a cylindrical shape, the outer diameter surface of the sludge molding is subjected to the pumping action of the extrusion screw 104 at the time of extrusion to cause the extrusion molding machine. The contact with the main body 102 forms a layered structure that coincides with the extrusion direction. Further, the inner diameter surface of the sludge molded body is formed by the inner diameter mouthpiece 110, and similarly, when the extrusion screw 104 is subjected to the pressure-feeding action, the layered structure that coincides with the extrusion direction is formed by the contact with the inner diameter mouthpiece 110. At this time, since the inner diameter mouthpiece 110 is provided so as to be freely rotatable, it slightly rotates according to the flow of the organic sludge, but the layered structure on the inner diameter surface remains in a range substantially matching the extrusion direction.

Since the sludge molded body thus extruded and formed has a layered structure in which both the inner and outer diameter surfaces substantially coincide with the extruding direction, it substantially coincides with the extruding direction during the subsequent drying and carbonization sintering. Cracks tended to occur along the lamellar structure reaching the inner and outer diameter surfaces. Furthermore, since the inner diameter die is supported via the support member 108 of the extruder body 102,
The extruded organic sludge is once separated by the support member 108, and is again pressure-bonded immediately before discharge. For this reason, in the sludge molded body, the portion separated and crimped by the supporting member 108 had a insufficient crimping degree, and was in a state where cracking was particularly likely to occur.

[0012]

The problem to be solved by the present invention is to provide a layered structure in which the inner and outer diameter surfaces of the sludge molded body are substantially coincident with the extrusion direction even when a cylindrical sludge molded body is obtained by extrusion molding. Therefore, when the sludge molded body is dried and carbonized and sintered, cracks reaching the inner and outer diameter surfaces of the sludge molded body occur, and the shape of the cylindrical sludge molded body is changed to that of the final product, the carbonized sintered body. In addition to being unable to be reliably reflected in the above, there is a limitation in handling the obtained carbonized sintered body depending on the form of the carbonized sintered body, such as lack of physical strength of the carbonized sintered body.

An object of the present invention is to obtain a cylindrical sludge molded body from an organic sludge by extrusion molding, and even if the cylindrical sludge molded body is treated in a drying step and a carbonization sintering step, cracks reaching the inner and outer diameter surfaces can be obtained. An object of the present invention is to provide an organic sludge extrusion molding method capable of reflecting the shape of a carbonized sintered body without causing the sludge. Another object of the present invention is to provide an extrusion molding method of organic sludge, which removes residual air of organic sludge during extrusion molding and suppresses generation of cracks due to residual air in the sludge molded body.

[0014]

In order to achieve the above object, the method for extruding an organic sludge according to claim 1, wherein the organic sludge having a water content of 30 to 50% is extruded by an extruding machine. Then, in the method of extrusion molding of organic sludge to obtain a sludge molded body, the inner diameter mouthpiece of circular cross section is fixed to the tip of the extrusion screw in the extruder body, while on the other hand, on the discharge side of the extruder body. With the outer diameter base attached,
A discharge port is provided by an inner diameter mouthpiece and an outer diameter mouthpiece, and by rotating both the extrusion screw of the extruder and the inner diameter mouthpiece, a cylindrical sludge molded body is extruded and extruded on the outer diameter surface of the sludge molded body. It is characterized in that a layered structure which substantially coincides with the direction is formed, and a layered structure which is substantially perpendicular to the extrusion direction is formed on the inner diameter surface of the sludge molded body.

Further, the extrusion molding method for organic sludge according to claim 2 is characterized in that, in the extrusion molding method for organic sludge according to claim 1, the residual air of the organic sludge in the extruder is removed by suction. Is.

Since the invention according to claim 1 is as described above, a sludge molding is extruded from an organic sludge having a water content of 30 to 50% by an extrusion molding machine. The extrusion screw is provided toward the discharge port side and an inner diameter mouthpiece having a circular cross section is provided at the tip of the extrusion screw, while the outer diameter die is attached to the discharge port side of the main body of the extrusion molding machine and the inner diameter Since the discharge port is provided by the mouthpiece and the outer diameter mouthpiece, a cylindrical sludge molded body is extruded. At this time, since the extrusion screw of the extruder and the inner diameter mouthpiece are rotated together, a layered structure is formed on the inner diameter surface of the sludge molded body in a direction substantially at right angles to the extrusion direction and based on the rotation of the inner diameter mouthpiece. A layered structure is formed on the outer diameter surface of the sludge molded body, the layered structure being substantially coincident with the extrusion direction.

Since the invention according to claim 2 is as described above, in the extrusion molding method, the residual air of the organic sludge in the extrusion molding machine is sucked and removed.

According to the extrusion molding method for organic sludge of the first aspect of the invention, in the extruded cylindrical sludge molding, the outer diameter surface of the sludge molding substantially coincides with the extrusion direction as in the conventional case. A layered structure is formed, but since a layered structure is formed on the inner diameter surface of the sludge molded body in a direction substantially perpendicular to the extrusion direction, the outer diameter surface and the inner diameter surface are in a state of intersecting each other.

Therefore, even if this sludge molding is dried and carbonized and sintered, it is possible to suppress the occurrence of cracks reaching the inner and outer diameter surfaces of the sludge molding when it is dried and the sludge molding when it is carbonized and sintered.

As a result, the form of the sludge molding can be reflected in the form of the carbonized sintered body, and the physical strength of the carbonized sintered body can be improved. It can be immediately applied to applications depending on the form of the carbonized sintered body.

Further, the effect of suppressing the strain of the sludge molded body, which tends to occur during drying or carbonization and sintering, is also obtained.

According to the organic sludge extrusion molding method of the second aspect of the present invention, the same operational effect as the organic sludge extrusion molding method of the first aspect can be obtained, but residual air of the organic sludge is removed during the extrusion molding. Since it is removed by suction, cracks due to residual air, which tend to remain in the sludge molding, are suppressed, and the degree of crimping of the obtained sludge molding is increased, so that shape retention and physical strength are further improved.

The organic sludge in this specification means
Examples include sewage sludge generated in sewage treatment facilities, purified water sludge generated in purified water treatment facilities, human waste, livestock excrement and activated sludge.
Further, the sludge molded body is an extruded product of organic sludge having a water content adjusted to 30 to 50%, and the carbonized sintered body is the dried sludge molded body which is carbonized and sintered by thermal decomposition. Is.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of a sludge treatment according to an embodiment of the present invention, FIG. 2 is a side view showing an extrusion molding machine according to an embodiment of the present invention, and FIG. 3 is an extrusion molding of a sludge molding according to the embodiment. And FIG. 4 is a perspective view of the sludge molded body according to the embodiment. FIG. 5 is a side view of an extrusion molding machine related to conventional extrusion molding. FIG. 6 shows A- in FIG.
It is sectional drawing of the A line.

An embodiment of the present invention will be described.
Extrusion molding of organic sludge in the embodiment of the present invention,
As shown in the block diagram of FIG. 1, it relates to a molding step of obtaining a sludge molded body S from an organic sludge M of which water content is adjusted among the organic sludge processing steps.

The subsequent steps of the molding step are a drying step of drying the sludge molded body S and a carbonizing and sintering step of carbonizing and sintering the dried sludge molded body S, and the final purpose of the organic sludge treatment step is waste. It is to obtain a carbonized and sintered body that can be effectively utilized from the organic sludge M.

The organic sludge M in this embodiment is a sewage sludge generated in a sewage treatment facility, and has a water content adjusted to 40% for more preferable extrusion molding. Explaining the molding step according to the extrusion molding method of this embodiment, the extrusion molding machine 10 is used as a specific means for molding the organic sludge M into a sludge molded body S in the molding step (see FIG. 2). .

Extrusion molding machine 10 in this embodiment
The discharge port 14 is provided on one side of the main body 12 of the extrusion molding machine 10, and the sludge input port 16 for inputting the organic sludge M from above is provided on the other side of the main body 12. Body 12
An extruding screw 18 supported on the other side of the main body 12 is provided inside thereof toward the discharge port 14 side. Therefore, the rotation of the extrusion screw 18 allows the organic sludge M introduced into the extrusion molding machine 10 to be pressure-fed toward the discharge port 14. The extrusion screw 18 is rotated in a fixed direction by a driving unit (not shown), but may be a variable speed type driving unit using an inverter.

A support shaft 22 is extended from the tip of the extrusion screw 18 (on the side of the discharge port 14), and the support shaft 22 is extended.
A substantially conical inner diameter mouthpiece 24 is fixed to the tip of the. In this embodiment, the upper bottom 26 of the inner diameter base 24 is the support shaft 22.
And the lower bottom 28 faces the discharge port 14.

Therefore, the inner diameter mouthpiece 24 is rotated integrally with the extrusion screw 18 by the rotation of the extrusion screw 18. The outer diameter die 30 is attached to the extruder body 12 so as to cover the circumference of the inner diameter die 24, but the inner diameter dimension d1 (radius) of the outer diameter die 30 is constant. The discharge port 14 has an inner diameter mouthpiece 24 and an outer diameter mouthpiece 3
The discharge port 14 has a cylindrical shape in cross section.

Therefore, the organic sludge M continuously extruded from the discharge port 14 has a cylindrical shape, and by cutting the cylindrical organic sludge M to a predetermined size,
A cylindrical sludge molded body S having a constant size is obtained. Since the inner diameter dimension d1 (radius) of the outer diameter mouthpiece 30 and the diameter of the lower bottom 28 of the inner diameter mouthpiece 24 are d2, the thickness of the sludge molded body S in this embodiment is (d1-d2).

On the other hand, a suction mechanism 32 for removing the residual air of the organic sludge M introduced into the main body 12 is provided near the other side of the extruder main body 12. The suction mechanism 32 includes a suction hole 34 penetrating into the main body 12, a suction pipe 36 communicating with the suction hole 34, and a suction source 3 connected to the suction pipe 36.
It is composed of 8.

Due to the negative pressure generated in the suction source 38,
The residual air of the organic sludge M in the main body 12 can be sucked and removed through the suction pipe 36 and the suction hole 34, the pressure-bonding degree of the organic sludge M that is pressure-fed is increased, and the shape retention of the extruded sludge molded body S is improved. And contributes to the improvement of physical strength.

In this embodiment, the sludge inlet 1
6 is covered with a lid (not shown) to be in a closed state, and the suction mechanism 32
Although the residual air of the organic sludge M is reliably sucked and removed by the above method, a honeycomb-shaped screen plate may be provided near the molding machine main body 12 of the sludge inlet 16, and similarly, the residual air can be reliably sucked and removed. Can be planned.

Next, the extrusion molding according to this embodiment will be described. When the organic sludge M is charged through the sludge charging port 16 of the extrusion molding machine 10, the charged organic sludge M is pressure-fed toward the discharge port 14 by the rotation of the extrusion screw 18.

At this time, the suction mechanism 32 sucks and removes the air in the main body 12, and also sucks and removes the residual air remaining in the organic sludge M.

The organic sludge M is pressure-fed toward the discharge port 14 while being sucked and removed by the suction mechanism 32 to remove residual air, so that the degree of pressure bonding is increased. Organic sludge M is extrusion screw
When passing through the support shaft 22 from the tip of 18 and reaching the inner diameter mouthpiece 24 and the outer diameter mouthpiece 30, the organic sludge M becomes a conical inner diameter mouthpiece 2
4 and the outer diameter die 30 are pressure-fed to the discharge port 14 so as to form the basic form of the cylindrical sludge molded body S.

At this time, the inner diameter mouthpiece 24 is an extrusion screw.
Since it is rotated together with 18, the lower bottom 2 of the inner diameter mouthpiece 24
The organic sludge M with which 8 contacts is subjected to a frictional action due to the rotation of the inner diameter mouthpiece 24, and a layered structure extending in a direction substantially perpendicular to the extrusion direction is formed. On the other hand, since the outer diameter spinneret 30 is fixed to the extruder body 12, the organic sludge M in contact with the outer diameter spinneret has a frictional action in a direction substantially corresponding to the extrusion direction, and a layered structure matching the extrusion direction. Is formed.

Therefore, in the vicinity of the discharge port 14, the layered structure formed by the inner diameter mouthpiece 24 and the layered structure formed by the outer diameter mouthpiece intersect with each other. The organic sludge M is continuously discharged. The continuously discharged cylindrical organic sludge M is cut into a predetermined size to obtain a sludge molded body S.

The sludge molding S thus obtained has an inner diameter surface which is substantially perpendicular to the extrusion direction and has an inner diameter mouthpiece 24.
A layered structure based on the rotation of is formed, and a layered structure that substantially coincides with the extrusion direction is formed on the outer diameter surface.

Although the outer diameter surface of the sludge molding S has a layered structure which substantially coincides with the extrusion direction as in the conventional case, a layered structure which is substantially perpendicular to the extrusion direction is formed on the inner diameter surface of the sludge molding S. Therefore, the layered tissues on the outer diameter surface and the inner diameter surface intersect each other.

Therefore, even if the sludge molded body S is dried and carbonized and sintered, the contraction of the layered structure which occurs during drying and sintering occurs in the inner diameter surface and the outer diameter surface in directions orthogonal to each other. It is possible to suppress the occurrence of cracks reaching the inner and outer diameter surfaces of the sludge compact S during drying and the sludge compact S during carbonization and sintering.

As a result, the form of the sludge molding S can be reflected in the form of the carbonized sintered body, and the physical strength of the carbonized sintered body can be improved, so that the obtained carbonized sintered body is obtained. Can be immediately applied to applications depending on the form of the carbonized sintered body. In addition, the effect of suppressing the strain of the sludge molded body S, which tends to occur during drying or carbonization and sintering, is also obtained.

Although the organic sludge contains fibers of animals and plants, since the inner diameter mouthpiece 24 is provided at the tip of the extrusion screw 18, the support member 10 of the conventional extrusion molding machine 100 is provided.
The problem that the fibers are caught in No. 8 does not occur during extrusion molding. Therefore, smooth extrusion molding can be performed without blocking the discharge port 14 of the extrusion molding machine 10.

[Brief description of drawings]

FIG. 1 is a block diagram of sludge treatment according to an embodiment.

FIG. 2 is a side view showing the extruder according to the embodiment.

FIG. 3 is a perspective view illustrating extrusion molding of the sludge molded body according to the embodiment.

FIG. 4 is a perspective view of a sludge molded body according to an embodiment.

FIG. 5 is a side view of an extrusion molding machine according to conventional extrusion molding.

6 is a cross-sectional view taken along the line AA in FIG.

[Explanation of symbols]

10 Extruder 12 Extruder body 14 Discharge port 16 Sludge input port 18 Extrusion screw 22 spindle 24 Inner Diameter Base 26 Upper floor 28 Bottom 30 outer diameter 32 Suction mechanism 34 Suction hole 36 Suction tube 38 Suction source 100 extruder 102 Main body of molding machine 104 Extrusion screw 108 Support member 110 Inner diameter mouthpiece 112 outlet M organic sludge S sludge molding

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Claims (2)

(57) [Claims] 1. A method of extruding organic sludge having a water content of 30 to 50% by an extrusion molding machine to obtain a sludge molding, wherein the tip of an extrusion screw in the main body of the extrusion molding machine. On the other hand, the inner diameter mouthpiece with a circular cross-section is fixed, while the outer diameter mouthpiece is mounted on the discharge mouth side of the extruder body, and the discharge mouth is provided by the inner diameter mouthpiece and the outer diameter mouthpiece. -And the inner diameter spinner are rotated together to extrude a cylindrical sludge molded body to form a layered structure on the outer diameter surface of the sludge molded body, which is almost coincident with the extrusion direction, and at the inner diameter surface of the sludge molded body. An extrusion molding method for organic sludge, which comprises forming a layered structure in a direction substantially perpendicular to the extrusion direction. 2. The method for extruding an organic sludge according to claim 1, wherein residual air of the organic sludge in the extruder is removed by suction.