JPH1110183A - Method for producing contact oxidation material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily provide spherical or capsulate-like three-dimensional hollow structure bodies, prevent the structure bodies from being intertwisted, evenly immobilize microorganism in any direction in which polluted water flows, and improve the purification efficiency for polluted water by combining the bodies with string-like contact oxidation materials. SOLUTION: A plurality of thermoplastic material extruded into string-like shapes are formed into cylindrical shape to give a water permeable pipe having voids, prescribed parts of the water permeable pipe are locally heated, and the heated parts of the water permeable pipe are squeezed to partitioning parts 30 with the maximum diameter of a pair of rolls 14 to deform the water permeable pipe. Consequently, the parts responding to the partitioning parts 30 are closed to give spherical contact oxidation materials 50a. In this case, by inserting a string-like contact oxidation material into the inner space of the water permeable pipe, the contact oxidation materials 50a in which the string- like contact oxidation material is bridged in the closed parts are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a contact oxidizing material which is installed in a sludge or sewage treatment tank to improve the adhesion of microorganisms and the like and is suitable for purifying water.

[0002]

2. Description of the Related Art Recently, a string-shaped contact oxidizing agent is put into a purification tank, and microorganisms in sewage are fixedly proliferated. Nitrogen and phosphorus in sewage are oxidized by a food chain by the microorganisms to form water. Has been purified. In the case of purification in running water such as rivers, microorganisms and the like are easily captured by the string-like contact oxidizing material along the flow, and the purification action is promoted.However, in the case of still water such as in a sludge or sewage treatment tank, The water is agitated by a fluidized bed purifier or activated sludge stirrer, etc.Because there is little chance that microorganisms etc. will be trapped in the contact oxidizer unless the purification process is carried out by putting the string-like contact oxidizer into it. , The purifying action is not promoted. However, when sewage is stirred by a fluidized bed purifier or an activated sludge stirrer, the string-like contact oxidizing material is entangled or stretched, thereby impairing the original performance. For this reason, it is necessary to have a shape in which the contact oxidizing materials do not entangle with each other.

In view of the above, various three-dimensional net-like aggregates made of synthetic resin having complicated and irregular voids have been disclosed as shapes that do not become entangled with each other. For example, a large number of thermoplastic synthetic resin filaments in a molten state are spun from a downward nozzle, and the linear synthetic resin is naturally lowered while winding down to form a three-dimensional net formed into a mat, rod, or pipe. A method of forming an aggregate is known (JP-B-62-60).
494 and JP-A-2-6583. According to this method, the contact oxidizing materials have a three-dimensional structure and do not become entangled with each other.

[0004] However, if these mat-like, rod-like or pipe-like three-dimensional net-like aggregates are put into a fluidized bed purifier or an activated sludge stirrer together with a string-like contact oxidizing material and stirred, for example, Since the three-dimensional net-like aggregate has directionality, it cannot exhibit sufficient performance for a three-dimensional flow of sewage. The contact oxidizing agent of the three-dimensional net-like aggregate having a rounded shape such as a sphere can exhibit the above-mentioned performance uniformly in all directions of the flow of the sewage.

As a method for producing a three-dimensional net-like aggregate having a spherical shape or the like, a large number of thermoplastic synthetic resin filaments in a molten state are spun from a downward nozzle while the linear synthetic resin is naturally lowered. A method has been proposed in which a net-like aggregate formed by passing through a semi-circular mold is bent into an arc shape, the net-like aggregate is cut into a predetermined length, and cut ends are combined to form a sphere or the like ( JP-A-6-158505, JP-A-6-158506, JP-A-6-184908
And JP-A-7-68284).

[0006]

However, these prior arts (JP-A-6-158505, JP-A-6-158505)
In the method for producing a three-dimensional void network aggregate according to JP-A-158506, JP-A-6-184908 and JP-A-7-68284, it is necessary to cut and rework the cut opening after molding. There is a problem that it is complicated.

The present invention has been made in view of such a problem, and a spherical or capsule-shaped three-dimensional void structure can be easily obtained without being entangled with each other.
Microbes can be uniformly attached to all directions of the flow of sewage, and by combining with a oxidized contact oxidant in a string form, the purification efficiency of sewage can be improved. It is intended to provide a manufacturing method.

[0008]

A first method of manufacturing a contact oxidizing material according to the present invention is directed to a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape. Step of locally heating a predetermined portion of the water-permeable pipe between a pair of forming rolls having a plurality of partition portions having a maximum diameter at a predetermined portion in the roll axis direction. And forming an outer shell portion whose both ends are closed by being engaged so as to coincide with each other.

A second method for producing a contact oxidizing material according to the present invention is a method for producing a string-shaped or belt-shaped permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape. A step of passing a contact oxidizing agent, a step of locally heating a predetermined portion of the water permeable pipe, and a step of passing the water permeable pipe between a pair of forming rolls having a plurality of partitions having a maximum diameter at predetermined portions in the roll axis direction. And shaping the heated shell so that the heated portion coincides with the partitioning portion to form an outer shell having both ends closed.

[0010] A third method for producing a contact oxidizing material according to the present invention is to provide a water-permeable pipe having a gap formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape to a predetermined length. Cutting and heating one end thereof; pressing the one end against a bowl-shaped forming die to close the one end; heating the other end of the pipe; and forming a bowl-shaped mold. Pressing the other end against a mold to close the other end.

[0011] A fourth method for producing a contact oxidizing material according to the present invention is a method for producing a string-shaped or belt-shaped thermoplastic material into a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials into a cylindrical shape. A step of passing a contact oxidizing material, a step of cutting the pipe to a predetermined length and heating one end thereof, and a step of pressing the one end portion against a bowl-shaped mold to close the one end portion, The method includes a step of heating the other end of the pipe, and a step of pressing the other end against a bowl-shaped forming die to close the other end.

In the first and second methods for producing a contact oxidizing material according to the present invention, separation of a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape. The part to be heated is locally heated, and this separated part is pushed in by a partition provided on a pair of rolls,
The thermoplastic material is deformed to create an obstruction. For this reason, it is possible to produce a large number of cylindrical or capsule-shaped contact oxidizers each having a cylindrical shape with both ends closed. Further, if the string-shaped contact oxidizing material is inserted into the water-permeable pipe prior to closing the water-permeable pipe with the roll, the string-shaped contact oxidizing material is supported at the closed portion, and the string-shaped contact oxidizing material is heated. A contact oxidizing material having a shape bridged in the outer shell made of a plastic material is obtained. In addition, each contact oxidizing material can be used as it is, or may be separated according to the use.

In the third and fourth methods for producing a contact oxidizing material according to the present invention, after cutting a water-permeable pipe to a predetermined size, the end is heated and pressed against a bowl-shaped forming die. Perform rounding process. Even in this case, the first and second
A contact oxidizer similar to the invention can be produced.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. First, FIG.
With reference to (a) to (d) and FIGS. 2 (a) and (b),
The structure of the contact oxidizing material manufactured by the method of the embodiment of the present invention will be described. FIGS. 1A to 1D are cross-sectional views of the contact oxidizing material, and FIGS. 2A and 2B are external views thereof.

The contact oxidizing material 50a shown in FIG. 1A is an outer shell 2a obtained by molding a noodle-like thermoplastic resin into a spherical shell.
And a cord-like contact oxidizing material 1 bridged in the outer shell portion 2a.
2a. The outer shell portion 2a is formed by rounding both ends in the axial direction of a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape, and closing and forming the spherical shape. is there. The string-shaped contact oxidizing material 12a is housed inside the outer shell 2a in a state of being bridged over the closed portions at both ends of the outer shell 2a. This outer shell 2
The distance between the closed portions of R is R, and the outer shell 2a has a diameter of R.
And has a large number of gaps, and has water permeability to allow water to pass through the internal space 1a.

The contact oxidizing material 50b shown in FIG. 1B is different from the contact oxidizing material 50b only in that the outer shell 2b has a capsule shape as shown in FIG.
Is different from the contact oxidizing material 50a shown in FIG. This contact oxidizing material 50
b, the length between the closed portions is R ', and the string-shaped contact oxidizing material 12
b also has the length of R '.

The contact oxidizing material 50c shown in FIG. 1C is different from the contact oxidizing material 12a only in that a strip-shaped contact oxidizing material 12c using a nonwoven fabric is disposed in the outer shell 2c. This is different from the contact oxidizing material 50a shown in FIG.

The contact oxidizing material 50d shown in FIG. 1 (d) is different from the contact oxidizing material 50c shown in FIG. 1 (c) in that the outer shell 2d is formed in a capsule shape. Is different from the contact oxidizing material 50b shown in FIG.

Since these contact oxidizing materials have water permeability and a structurally rounded spherical or capsule-shaped outer shell, they can be used, for example, in a fluidized bed activated sludge treatment tank. Even when the mixture is stirred, the mixture is not caught and does not become entangled with each other, so that the wastewater can be purified smoothly.

Since the outer shells 2a to 2d themselves function as contact oxidizers, the string-shaped contact oxidizers 12a or 12b or the strip-shaped contact oxidizers 12c or 12d need not be disposed in the outer shells 2a to 2d. Also, only the outer shells 2a to 2d can be used as a contact oxidant for purification of sewage.

Next, a method for manufacturing a contact oxidizing material according to an embodiment of the present invention will be described. FIG. 3 is a plan view showing a state before processing of the outer shell, and FIG. 4 is a plan view showing a state in which a noodle-like thermoplastic material to be the outer shell is placed between rolls. ) Is a cross-sectional view showing a state in which a noodle-like thermoplastic material serving as an outer shell is placed between rolls, FIG. 5B is a cross-sectional view showing a state in which the outer shell is being closed, and FIG. FIG. 7 is a plan view showing a state immediately after the spherical processing, and FIG. 7 is a plan view showing a state where a continuous contact oxidizing material is taken out after the spherical processing.

The rolls 14 are formed of metal or heat-resistant resin. As shown in FIG. 3, a plurality of partition portions 30 each having the maximum diameter are formed at intervals of a distance R in the axial direction of the pair of rolls 14. The roll section is curved with a radius of R / 2 between the partitioning portions 30, and this portion has an arc-shaped curved surface with a radius of R / 2. Then, the pair of rolls 14 can move in a direction parallel to its axis, move closer to and away from each other, and can rotate in the same direction or in different directions.

The outer shell 2a of the contact oxidizing material in this embodiment
Is obtained by processing the water permeable pipe 3 using the roll 14. The water-permeable pipe 3 is formed by extruding a thermoplastic resin into a string shape, converting the plurality of string-shaped materials into a noodle shape, and forming the hollow material into a cylindrical shape having an outer diameter R.

First, as shown in FIGS. 4 and 5 (a),
The pair of rolls 14 are moved close to each other so that the partitioning portions 30 come into contact with each other, and the water-permeable pipe 3 is disposed on the pair of rolls 14.
Insert a. And the partitioning part 3 of the maximum diameter of the roll 14
The separated portion of the water-permeable pipe 3 corresponding to 0 is heated to a temperature equal to or higher than the softening point of the thermoplastic resin. As the heating means, heating by a heater, dipping or spraying in high-temperature oil,
There are irradiation of a near-infrared lamp or a far-infrared lamp, or injection of ethylene glycol heated at a high temperature. Then, the heating unit corresponding to the separation part of the water-permeable pipe 3 is
The roll 14 is rotated against the partition 30 of No. 4. Then, as shown in FIG. 5 (b), the heated portion of the water permeable pipe 3 is pushed into the partition 30 of the roll 14 and deformed, and the separated portion of the water permeable pipe 3 is deformed by the partition 30 of the roll 14. It is closed. In this case, roll 1
The side surface of the water permeable pipe 3 between the partition sections 30 of 4 is not heated, and is not deformed or the space 1 is reduced.
For this reason, the string-shaped contact oxidizing material 12a is supported by the closed portion, and the string-shaped contact oxidizing material 12a is bridged between the separated portions.

In this manner, as shown in FIG. 6, the separation portion corresponding to the partition 30 is closed, and the contact oxidizing material 50a having the continuous spherical outer shell 2a is formed.
Then, as shown in FIG. 7, the roll 14 is opened and the contact oxidizing material 50a is taken out.

As described above, according to the present embodiment, the contact oxidizing material 50a having the continuous spherical outer shell 2a can be obtained. As the contact oxidizing material to be inserted into the outer shell portion, in addition to the string-shaped contact oxidizing material 12a, a belt-shaped contact oxidizing material
When c is used, a non-woven strip-shaped contact oxidizing material 12c is laid over the outer shell 2c, and a contact oxidizing material 50c supported by the closed portion is obtained.

Further, by rotating the partitioning portions 30 of the two rolls 14 by pressing them, independent spherical contact oxidizing materials 50a or 50c can be obtained.

Next, a method of manufacturing a contact oxidizing material in which a string-like contact oxidizing material 12b is compounded in a capsule-shaped outer shell portion 2b will be described. 8 is a plan view showing a state immediately after the encapsulation, FIG. 9 is a plan view showing a state in which a continuous contact oxidant is taken out after the encapsulation, and FIG. 10A is a plan view showing a continuous spherical contact oxidant. FIG. 10 (b) is a plan view showing a continuous capsule-shaped contact oxidizing material.

In this embodiment, a roll 15 having a distance R 'between the sections 31 is used. That is, in the axial direction of the pair of rolls 15, a plurality of partitioning portions 31 each having a maximum diameter are provided.
Are provided at an interval of a distance R ′, and a flat portion is provided between the partition portions 31. The roll cross section is curved with a radius of R / 2 from the partitioning section 31 to the flat section, and the curved section 1
The end of the / 4 arc is connected to the flat part. Therefore, the roll 15 is different from the roll 14 used in the production of the contact oxidizing material in which only the shape between the partition portions 31 is spherical.

First, the permeable pipe 3 is placed on a pair of rolls 15.
Is disposed in the space of the water-permeable pipe 3 and the cord-like contact oxidizing material 12
Then, b is inserted, and the separated portion of the water-permeable pipe 3 corresponding to the partition 31 having the largest diameter of the roll 15 is heated to a temperature higher than the softening point of the thermoplastic resin. Then, the heating unit corresponding to the separation part of the water-permeable pipe 3 is applied to the partitioning part 31 of the roll 15 and the roll 15 is rotated. As a result, as shown in FIG. 8, the heated portion of the water-permeable pipe 3 is closed by the partitioning portion 31 of the roll 15, the closed portion supports the string-shaped contact oxidizing material 12 b, and the string-shaped contact oxidizing material 12 b It is bridged between the separation parts.

As described above, as shown in FIG. 10 (b), it is possible to obtain a continuous contact oxidant 50b having a capsule-shaped outer shell portion 2b of the contact oxidant. When a band-shaped contact oxidizing material 12d made of non-woven fabric is used as the contact oxidizing material to be inserted into the outer shell portion, in addition to the cord-shaped contact oxidizing material 12b, a non-woven band-shaped contact oxidizing material 1 is formed in the outer shell portion 2d.
2d is bridged, and the contact oxidizing material 50d supported by the closed portion is obtained. In addition, the separation part 3 of the two rolls 15
By pressing and rotating each of them, an independent capsule-shaped contact oxidizing material 50b or 50d can be obtained.

In this embodiment, the method for producing the contact oxidizing material in which the string-like contact oxidizing material is bridged in the outer shell portion has been described. However, the string-like contact oxidizing material in the space 1 of the water-permeable pipe 3 is necessarily provided. There is no. It is possible to purify sewage as a contact oxidizer only by the outer shell.

Next, a third embodiment of the present invention will be described. FIG. 11 is a view showing a bowl-shaped mold used for producing a spherical or capsule-shaped contact oxidizer according to the third embodiment of the present invention, and (a) is a perspective view showing a bowl-shaped mold used for spherical processing. FIG. 1B is a perspective view showing a bowl-shaped mold used for capsule-like processing. In this embodiment, the contact oxidizing material is individually formed.

First, a hemispherical bowl-shaped mold 20 having a bottom portion having a diameter R is provided.
Prepare Then, the water permeable pipe 3 having the outer diameter R is cut into a length of 2R. One end of the cut water-permeable pipe 3 is heated to a temperature equal to or higher than the softening point of the thermoplastic material. Then, with the heated end of the permeable pipe 3 at the top, the permeable pipe 3
Is pressed into the bowl-shaped mold 20, and the tip thereof is brought into contact with the bottom 25. Then, the heated distal end of the water-permeable pipe 3 is closed at the bottom 25 of the mold 20, and the outer surface of the end is formed. Next, the water-permeable pipe 3 is pulled out of the mold 20,
Similarly, the other end of the water-permeable pipe 3 is heated and
Push it to zero. Thereby, the other end of the water permeable pipe 3 is also closed. In this way, as shown in FIGS. 1 and 2, the contact oxidizers 50a and 50c whose both ends are closed are obtained. As shown in FIG. 11B, when the bowl-shaped mold 21 having the bottom portion 26 deeper than the bowl-shaped mold 20 is used, the capsule-shaped contact oxidizing material 50 b is processed by the same processing as described above. 50d can be obtained. Also,
Prior to pushing the water permeable pipe 3 into the bowl-shaped mold, a string-shaped contact oxidizing material may be inserted into the water permeable pipe 3, in which case a contact oxidizing material having a spherical or capsule-shaped outer shell is obtained. Can be Even with the above, a contact oxidizing material having a rounded end can be obtained.

The specific gravity of the thermoplastic material is 1 to 1.5.
By doing so, the rising and sinking of the contact oxidizing material when it is stirred can be easily controlled.

[0036]

As described in detail above, according to the present invention,
A large amount of spherical or capsule-shaped contact oxidizing materials can be produced with high efficiency. Further, according to the present invention, it is possible to easily produce a composite contact oxidant in which a string-like contact oxidant is bridged in an outer shell portion, and it is possible to increase the purification efficiency of sewage, and to improve the existing fluidity. If used in combination with a bed-type purification device or activated sludge stirring device, etc., smooth purification treatment is possible,
Purification processing capacity can be improved. Thus, according to the present invention, an aggregate of contact oxidizing materials can be easily obtained by connecting closed portions of a plurality of continuous spherical or capsule-like contact oxidizing materials with a rope or the like. Furthermore, the contact oxidizers produced by the method of the present invention do not become entangled with each other when purifying water quality in rivers or coasts.

[Brief description of the drawings]

FIG. 1A shows a spherical outer shell 2 according to an embodiment of the present invention.
5A is a cross-sectional view showing a spherical contact oxidizing material 50a in which a string-shaped contact oxidizing material 12a is bridged in a, and FIG. 5B is a capsule-like shape in which the string-shaped contact oxidizing material 12b is bridged in a capsule-shaped outer shell 2b. FIG. 4C is a cross-sectional view showing the contact oxidizing material 50b, and FIG. 4C is a cross-sectional view showing the spherical contact oxidizing material 50c in which a band-shaped contact oxidizing material 12c made of a nonwoven fabric is laid over the spherical outer shell 2c.
Is a capsule-shaped contact oxidizing material 5 in which a band-shaped contact oxidizing material 12d made of a nonwoven fabric is laid over a capsule-shaped outer shell portion 2d.
It is sectional drawing which shows 0d.

2 (a) is an external view of a spherical contact oxidizer, and FIG. 2 (b) is an external view of a capsule contact oxidizer.

FIG. 3 is a plan view showing a state before processing of an outer shell portion 2a.

FIG. 4 is a plan view showing a state in which a noodle-like thermoplastic material serving as an outer shell portion 2a is installed between rolls.

FIG. 5A is a cross-sectional view showing a state in which a noodle-like thermoplastic material serving as an outer shell 2a is installed between rolls, and FIG. 5B is a cross-sectional view showing a state where the outer shell 2a is being closed. FIG.

FIG. 6 is a plan view showing a state immediately after spherical processing.

FIG. 7 is a plan view showing a state in which a continuous contact oxidizing material is taken out after spherical processing.

FIG. 8 is a plan view showing a state immediately after capsule-shaped processing.

FIG. 9 is a plan view showing a state in which a continuous contact oxidizing material is taken out after capsule-like processing.

FIG. 10A is a plan view showing a continuous spherical contact oxidizer, and FIG. 10B is a plan view showing a continuous capsule-like contact oxidizer.

11A is a perspective view showing a bowl-shaped mold used for spherical processing, and FIG. 11B is a perspective view showing a bowl-shaped mold used for capsule-shaped processing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1; Internal space 2a, 2b, 2c, 2d; Outer shell part 3; Permeable pipe 9; Spherical contact oxidizer 10; Capsule contact oxidizer 12a, 12b; String contact oxidizer 12c, 12d; Rolls 20, 21; bowl-shaped molds 25, 26; bottoms 30, 31; partitioning parts 50a, 50b, 50c, 50d;

Claims (4)

[Claims] 1. A step of locally heating a predetermined portion of a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape, and The water-permeable pipe is engaged between a pair of forming rolls having a plurality of partitions having a maximum diameter so that a heated portion thereof coincides with the partitions to form an outer shell having both ends closed. And a method for producing a contact oxidizing material. 2. A step of passing a string-shaped or band-shaped contact oxidizing material through a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded into a string into a cylindrical shape, and A step of locally heating a portion, and a portion of the water-permeable pipe heated between a pair of forming rolls having a plurality of partition portions having a maximum diameter at a predetermined portion in the roll axis direction, wherein a heated portion of the pipe matches the partition portion. Forming an outer shell portion having both ends closed by being bitten as described above. 3. A step of cutting a water-permeable pipe having a gap formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape into a predetermined length, and heating one end thereof. Pressing the one end to a closed mold to close the one end; heating the other end of the pipe; pressing the other end to a bowl-shaped mold to remove the other end. And clogging the part. 4. A step of passing a string-shaped or band-shaped contact oxidizing material through a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape; Cutting into length, heating one end thereof, pressing the one end against a bowl-shaped mold to close the one end, heating the other end of the pipe, A step of pressing the other end against a mold in a shape of a circle to close the other end.