JP3441925B2 - Manufacturing method of contact oxidizer - Google Patents

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 catalytic oxidant, which is installed in a sludge or sewage treatment tank to improve adhesion of microorganisms and is suitable for purification of water quality.

[0002]

2. Description of the Related Art Recently, a string-shaped contact oxidizing material is put in a purification treatment tank to immobilize and proliferate microorganisms in wastewater, and the food chain of these microorganisms oxidizes nitrogen and phosphorus in the wastewater to produce water. Has been purified. If it is purified in running water such as a river, microorganisms etc. will be easily captured along the flow by the string-shaped contact oxidant, and the purification action will be promoted, but in the case of still water such as sludge or sewage treatment tank Is a water bed type agitator or activated sludge agitator, etc., and water is agitated, and if there is no purification treatment by putting a string-like catalytic oxidant in it, there is little chance that microorganisms will be captured by the catalytic oxidant. , The purification action is not promoted. However, when sewage is agitated by a fluidized bed type purification device or an activated sludge agitation device, the cord-shaped contact oxidant is entangled or stretched, impairing the original performance. Therefore, it is necessary to have a shape in which the contact oxidants are not entangled with each other.

Therefore, various three-dimensional net-like aggregates made of synthetic resin having complicated and irregular voids have been disclosed as shapes which do not get 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 filament synthetic resin is naturally descended and bent to form a mat-shaped, rod-shaped, or pipe-shaped three-dimensional network. A method of forming an aggregate is known (Japanese Patent Publication No. 62-60).
494 and JP-A-2-6593). According to this method, the catalytic oxidant has a three-dimensional structure and is not entangled with each other.

However, if these three-dimensional net-like aggregates in the shape of a mat, a rod or a pipe are put into a fluidized bed type purifier or an activated sludge agitator together with a string-like catalytic oxidant and agitated, Since the three-dimensional net-like aggregate has directionality, it cannot exhibit sufficient performance for the three-dimensional flow of wastewater. The contact oxidant of the three-dimensional reticulated aggregate having a rounded shape such as a sphere can uniformly exhibit the above-mentioned performance in all directions of the flow of wastewater.

As a method for producing a three-dimensional reticulated aggregate having a shape such as a sphere, a large number of molten thermoplastic synthetic resin filaments are spun from a downward nozzle and the filament synthetic resin is allowed to descend naturally. A method has been proposed in which a reticulated aggregate formed by passing through a semicircular mold is bent into an arc shape, the reticulated aggregate is cut into a predetermined length, and the cutting ports are aligned to form a spherical shape ( JP-A-6-158505, JP-A-6-158506, and JP-A-6-184908.
Japanese Patent Laid-Open No. 7-68284).

[0006]

However, these conventional techniques (Japanese Unexamined Patent Publication No. 6-158505 and Japanese Unexamined Patent Publication No. 6-158505) have been proposed.
158506, JP-A-6-184908, and JP-A-7-68284), the method for producing a three-dimensional void network assembly requires cutting and reworking of the cutting edge after molding, and the manufacturing process is There is a problem that it is complicated.

The present invention has been made in view of the above problems, and it is possible to easily obtain a spherical or capsule-shaped three-dimensional void structure, which are not entangled with each other, and
Microorganisms can be uniformly attached to all directions of the flow of sewage, and by combining it with a string-shaped contact oxidant, the efficiency of purification of sewage can be improved. It is intended to provide a manufacturing method.

[0008]

A first method for producing a catalytic oxidant according to the present invention is a water permeable pipe having voids formed by cylindrically molding a plurality of thermoplastic materials extruded in a cord shape. And heating the water-permeable pipe between the pair of forming rolls having a plurality of partitioning parts each having a maximum diameter at a predetermined part in the roll axial direction. And a step of forming the outer shell portion in which both ends are closed by being bitten so as to coincide with each other.

The second method for producing a catalytic oxidant according to the present invention is a strip-shaped or strip-shaped pipe having a void formed by forming a plurality of thermoplastic materials extruded in a strip shape into a cylindrical shape. The step of passing a contact oxidant, the step of locally heating a predetermined portion of the water-permeable pipe, and the water-permeable pipe between a pair of forming rolls having a plurality of partition portions with a maximum diameter at predetermined portions in the roll axial direction. To form a shell part in which both ends are closed by causing the heated part to bite into the partition part.

In a third method for producing a catalytic oxidant according to the present invention, a water-permeable pipe having a void formed by cylindrically molding a plurality of thermoplastic materials extruded in a string shape is formed to a predetermined length. Cutting and heating one end thereof, pressing the one end into a bowl-shaped mold to close the one end, heating the other end of the pipe, and bowl-shaped molding Pressing the other end of the mold to close the other end.

A fourth method for producing a catalytic oxidant according to the present invention is a cord-shaped or strip-shaped pipe having a void formed by molding a plurality of thermoplastic materials extruded in a cord shape into a cylindrical shape. A step of passing a contact oxidant, a step of cutting the pipe into a predetermined length and heating one end thereof, a step of pressing the one end to a bowl-shaped mold to close the one end, It has a step of heating the other end of the pipe, and a step of pressing the other end with a bowl-shaped mold to close the other end.

In the first and second methods for producing a catalytic oxidant according to the present invention, separation of a water-permeable pipe having a void formed by cylindrically molding a plurality of thermoplastic materials extruded in a string shape. The part to be heated is locally heated, and the separated part is pushed by the partition provided on the pair of rolls,
The thermoplastic material is deformed to create a blockage. Therefore, it is possible to highly efficiently produce a spherical or capsule-shaped contact oxidant having a cylindrical shape with a large number of closed ends. Further, prior to closing the water-permeable pipe with the roll, if a string-like contact oxidizing material is inserted into the water-permeable pipe, the string-like contact oxidizing material is supported at the closed part, and the string-like contact oxidizing material is heated. A contact oxidant having a shape of being bridged in the outer shell made of a plastic material can be obtained. The contact oxidants may be used continuously, or may be separated according to the application.

In the third and fourth methods for producing a catalytic oxidant according to the present invention, after cutting the water-permeable pipe into a predetermined size, the end portion is heated and pressed into a bowl-shaped forming die to end the end. Process to round the part. Even in this way, the first and second
A catalytic oxidant similar to the invention can be produced.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be specifically described below with reference to the accompanying drawings. First, Fig. 1
Referring to (a) to (d) and FIGS. 2 (a) and (b),
The structure of the catalytic oxidant produced by the method according to the embodiment of the present invention will be described. 1 (a) to 1 (d) are cross-sectional views of this contact oxidation material, and FIGS. 2 (a) and 2 (b) are external views thereof.

The contact oxidizer 50a shown in FIG. 1 (a) is an outer shell 2a obtained by molding a noodle-like thermoplastic resin into a spherical shell.
And the cord-shaped contact oxidant 1 laid across the outer shell 2a
2a and. The outer shell portion 2a is formed by molding a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape and forming a cylindrical shape into which both ends in the axial direction of the water permeable pipe are rounded to form a closed spherical shape. is there. The string-shaped contact oxidation material 12a is accommodated inside the outer shell portion 2a in a state of being bridged over the closed portions at both ends of the outer shell portion 2a. This outer shell 2
The distance between the closed portions of a is R, and the outer shell portion 2a has a diameter of R.
It has a spherical shape, has a large number of gaps, and has water permeability that allows water to pass through inside the internal space 1a.

The contact oxidant 50b shown in FIG. 1 (b) is shown in FIG. 1 (a) only in that the outer shell 2b is in the form of a capsule.
The contact oxidizer 50a shown in FIG. This contact oxidant 50
The length between the closed portions of b is R ', and the string-shaped contact oxidizer 12
b also has a length of R '.

The contact oxidation material 50c shown in FIG. 1 (c) is different only in that the strip-shaped contact oxidation material 12c made of non-woven fabric is arranged in the outer shell 2c instead of the string-shaped contact oxidation material 12a. It is different from the contact oxidation material 50a shown in FIG.

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

Since these catalytic oxidants have water permeability and also have a structurally rounded spherical or capsule-shaped outer shell, for example, in a fluidized bed activated sludge treatment tank. Even when agitated, since it is not caught, it does not become entangled with each other and the wastewater can be smoothly purified.

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 arranged 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 waste water.

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

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

Outer shell 2a of the catalytic oxidant 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, making a plurality of the string-shaped materials into a noodle shape, and forming a cylindrical shape having an outer diameter R with a hollow portion 1.

First, as shown in FIGS. 4 and 5 (a),
The pair of rolls 14 are moved closer to each other so that the partition portions 30 come into contact with each other, the water-permeable pipe 3 is arranged on the pair of rolls 14, and the string-shaped contact oxidizing material 12 is placed in the space 1 of the water-permeable pipe 3.
Insert a. And the partition 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, immersion in high temperature oil or spraying,
Irradiation with a near-infrared lamp or far-infrared lamp or injection of ethylene glycol or the like heated at a high temperature. Then, the heating unit corresponding to the separated portion of the water permeable pipe 3 is set to the roll 1
The roll 14 is rotated by applying it to the partition 30 of No. 4. Then, as shown in FIG. 5B, the heated portion of the water-permeable pipe 3 is pushed into the partition 30 of the roll 14 and deforms, and the separated portion of the water-permeable pipe 3 is separated 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 parts 30 of No. 4 is not heated and is not deformed or the space 1 is not reduced.
Therefore, the string-shaped contact oxidation material 12a is supported at the closed portion, and the string-shaped contact oxidation material 12a is bridged between the separated portions.

In this way, as shown in FIG. 6, the separated portion corresponding to the partition 30 is closed and the contact oxidant 50a having the continuous spherical outer shell 2a is formed.
Therefore, as shown in FIG. 7, the roll 14 is opened and the contact oxidant 50a is taken out.

As described above, according to this embodiment, the contact oxidant 50a having the continuous spherical outer shell 2a can be obtained. As the contact oxidant to be inserted into the outer shell portion, in addition to the string-like contact oxidant 12a, a belt-like contact oxidant 12 made of a nonwoven fabric is used.
When c is used, the non-woven fabric belt-shaped contact oxidizing material 12c is spanned in the outer shell portion 2c, and the contact oxidizing material 50c supported by the closed portion is obtained.

Further, by independently pressing the partition portions 30 of the two rolls 14 and rotating them, an independent spherical contact oxidant 50a or 50c can be obtained.

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

In this embodiment, the roll 15 having the distance R'between the partition parts 31 is used. That is, in the axial direction of the pair of rolls 15, a plurality of partition portions 31 each having the maximum diameter are provided.
Are provided at intervals of a distance R ', and a flat portion is provided between the partition portions 31. The roll cross section is curved at a radius of R / 2 from the partition 31 toward the flat portion, and
The ends of the / 4 arc are connected to the flat portion. Therefore, the roll 15 is different from the roll 14 used in the production of the spherical contact oxidation material only in the shape between the partitions 31.

First, the water-permeable pipe 3 is placed on the pair of rolls 15.
Is placed in the space of the water permeable pipe 3 and the cord-shaped contact oxidant 12
b is inserted, and the separated portion of the water-permeable pipe 3 that hits the partition 31 having the maximum diameter of the roll 15 is heated to the softening point of the thermoplastic resin or higher. Then, the heating portion corresponding to the separated portion of the water permeable pipe 3 is applied to the partition 31 of the roll 15 to rotate the roll 15. As a result, as shown in FIG. 8, the heated portion of the water-permeable pipe 3 is closed by the partition 31 of the roll 15, the cord-shaped contact oxidizing material 12b is supported by the closed portion, and the cord-shaped contact oxidizing material 12b is removed. It is bridged between the separated parts.

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

In the present embodiment, the method of manufacturing the contact oxidant in which the string-like contact oxidant is bridged in the outer shell has been described, but the string-like contact oxidant in the space 1 of the water permeable pipe 3 is not necessarily provided. There is no. It is possible to purify sewage as a contact oxidant only with 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 manufacturing a spherical or capsule-shaped catalytic oxidant according to the third embodiment of the present invention, and FIG. 11A 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 processing. In this embodiment, the contact oxidant is individually molded.

First, a bowl-shaped mold 20 whose bottom has a hemispherical shape with a diameter R.
To 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 heating end of the water-permeable pipe 3 at the top, the water-permeable pipe 3
Is pushed into the bowl-shaped mold 20, and its tip is brought into contact with the bottom portion 25. Then, the heated tip portion of the water-permeable pipe 3 is closed by the bottom portion 25 of the mold 20, and the outer surface of the end portion is molded. Next, the water permeable pipe 3 is pulled out from the mold 20,
The other end of the water-permeable pipe 3 is heated in the same manner, and this is heated by the mold 2
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, contact oxidants 50a and 50c with both ends closed are obtained. As shown in FIG. 11B, when a bowl-shaped mold 21 having a bottom portion 26 deeper than the bowl-shaped mold 20 is used, the capsule-shaped contact oxidant 50b 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 oxidant may be inserted into the water permeable pipe 3. In this case, a contact oxidant having a spherical or capsule-shaped outer shell is obtained. To be Even in the above-mentioned manner, it is possible to obtain a contact oxidant having rounded ends.

The specific gravity of the thermoplastic material is 1 to 1.5.
By setting the above, it is possible to easily control the floating and sinking of the catalytic oxidant during stirring.

[0036]

As described in detail above, according to the present invention,
A large amount of spherical or capsule-shaped catalytic oxidant can be produced with high efficiency. Further, according to the present invention, it is possible to easily manufacture a composite type contact oxidation material in which a string-shaped contact oxidation material is spanned in the outer shell portion, and it is possible to enhance the purification efficiency of sewage and to improve the existing flow. If used in combination with a floor-type purification device or an activated sludge agitation device, a smooth purification process is possible.
The purification treatment capacity can be improved. Thus, according to the present invention, an aggregate of contact oxidizers can be easily obtained by connecting the closed portions of a plurality of continuous spherical or capsule-shaped contact oxidizers with a rope or the like. Furthermore, the catalytic oxidants produced by the method of the present invention do not become entangled with each other during purification of water quality in rivers or coasts.

[Brief description of drawings]

FIG. 1A is a spherical outer shell portion 2 according to an embodiment of the present invention.
Sectional drawing which shows the spherical contact oxidation material 50a which the string-shaped contact oxidation material 12a was spanned in a, (b) is the capsule shape which the string-shaped contact oxidation material 12b was spanned in the capsule-shaped outer shell part 2b. Sectional drawing which shows the catalytic oxidizer 50b, (c) is sectional drawing which shows the spherical catalytic oxidizer 50c in which the belt-shaped catalytic oxidizer 12c which consists of a nonwoven fabric was spanned in the spherical outer shell part 2c, (d).
Is a capsule-shaped contact oxidant 5 in which a strip-shaped contact oxidant 12d made of a non-woven fabric is bridged in a capsule-shaped outer shell 2d.
It is sectional drawing which shows 0d.

2A is an external view of a spherical contact oxidant, and FIG. 2B is an external view of a capsule-shaped contact oxidant.

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

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

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

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 the capsule shape processing.

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

FIG. 10A is a plan view showing a continuous spherical catalytic oxidant, and FIG. 10B is a plan view showing a continuous capsule-shaped catalytic oxidant.

FIG. 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]

1; Internal space 2a, 2b, 2c, 2d; outer shell 3; Permeable pipe 9; Spherical contact oxidizer 10; Capsular contact oxidizer 12a, 12b; string-shaped contact oxidizing material 12c, 12d; zonal contact oxidizer 14, 15; Roll 20, 21; bowl-shaped 25, 26; bottom 30, 31; Separation part 50a, 50b, 50c, 50d; contact oxidizer

Continuation of front page (56) Reference JP-A-7-299486 (JP, A) JP-A-7-68284 (JP, A) JP-A-6-184908 (JP, A) JP-A-6-158506 (JP , A) Japanese Unexamined Patent Publication No. 6-158505 (JP, A) Actual development No. 6-45697 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) C02F 3/10 D04H 3/07

Claims (4)

(57) [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 a predetermined portion in the roll axial direction. The water-permeable pipe is bitten between a pair of forming rolls having a plurality of partitioning portions having the maximum diameter so that the heated portion thereof coincides with the partitioning portions to form an outer shell portion having both ends closed. A method for producing a contact oxidant, comprising the steps of: 2. A step of passing a string-shaped or strip-shaped contact oxidant into 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 a predetermined method of the water-permeable pipe. The step of locally heating the part and the heated part of the water-permeable pipe between the pair of forming rolls having a plurality of partition parts with the maximum diameter at a predetermined part in the axial direction of the roll coincide with the partition part. And a step of forming an outer shell portion having both ends closed by the above-mentioned method. 3. A step of cutting a water-permeable pipe having a void formed by forming a plurality of thermoplastic materials extruded in a string shape into a cylindrical shape into a predetermined length and heating one end thereof, The one end of the pipe-shaped mold by closing the one end, the step of heating the other end of the pipe, the bowl-shaped mold by pressing the other end of the other end And a step of closing the portion. 4. A step of passing a cord-shaped or strip-shaped contact oxidant into a water-permeable pipe having a void formed by molding a plurality of thermoplastic materials extruded in a cord shape into a cylindrical shape, and the pipe is provided with a predetermined shape. Cutting into lengths and heating one end thereof, pressing the one end into a bowl-shaped mold to close the one end, and heating the other end of the pipe, And a step of pressing the other end against a mold having a rectangular shape to close the other end.