JP2007301511A - Method for manufacturing netted contact body element, and rotatable circular netted contact body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a netted contact body element which has excellent strength and is applicable to long-term waste water treatment. <P>SOLUTION: The method for manufacturing the rotatable circular netted contact body element 4 by cutting/processing a synthetic fiber block which is obtained by forming a three-dimensionally netted block from a synthetic fiber and sticking the intersecting synthetic fibers to one another at intersection points by using an adhesive is provided. The method comprises the steps of: cutting the synthetic fiber block into disk-shaped bodies and equally dividing the obtained disk-shaped body in the radial direction into fan-shaped bodies to prepare a netted contact body element precursor; forming a through-hole 20 for inserting a spacer on the fan-shaped netted contact body element precursor; compressing the outer circumference 21 of the netted contact body element precursor and the circumference of the through-hole 20 by using a hot pressing machine to form compressed parts 25; hot-pressing the whole area 22 of the netted contact body element precursor except for the outer circumference 21 of the netted contact body element precursor and the circumference of the through-hole 20 at 90-140°C by using the hot pressing machine so that the porosity becomes within 90-98%; and leaving the hot-pressed netted contact body element precursor as it is for five days or more to promote the crystallization of the thermally press-stuck synthetic fiber. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  TECHNICAL FIELD The present invention relates to a method for producing a mesh contact element used for contact-type biological wastewater treatment and a rotating circular mesh contact body, and more particularly, a method for producing a mesh contact element having excellent strength and applicable to long-term wastewater treatment. And a rotating circular mesh contact.

  Conventionally, as one of the technologies for treating organic wastewater using a biofilm, a rotating circular mesh contact body in which resin fiber yarns are formed in a mesh shape is attached to the main shaft of the contact tank, and the rotation is performed in the liquid in the contact tank. An apparatus is known in which a part of a circular mesh-like contact body is immersed and rotated, and microorganisms are attached to the surface of the resin fiber yarn to grow and treat organic substances in the waste water (see Patent Documents 1, 2, and 3).

  By using such special rotating circular mesh contact body, it is possible to supply oxygen sufficiently to microorganisms and supply nutrients, increase the contact area between organisms and organic matter, and enable high load treatment. became.

Patent Document 4 discloses a technique for manufacturing a fan-shaped mesh-like contact element obtained by dividing a disk into six parts in order to form a special rotating circular mesh-like contact body. A method is disclosed in which a through hole is formed or a compressed portion is formed by compressing the outer periphery or the periphery of the through hole.
Actual fair 1-253594 Reality No.1-13600 Reality No.1-16559 Registered utility model No. 3064723

  However, in the method described in Patent Document 4, compression of the outer periphery of the sector-shaped block and the periphery of the through hole is disclosed, but there is no disclosure regarding the temperature condition of the hot press machine.

  As a result of intensive studies to further improve the manufacturing method disclosed in Patent Document 4, the present inventor has found that only the outer periphery of the fan-shaped block (referred to as a reticulated contact element element precursor in the present invention) and the periphery of the through-hole. In the heat press, when the finally manufactured rotating circular mesh contact body is used for wastewater treatment, it is still insufficient in strength, and it is improved to enable long-term operation when applied to wastewater treatment. It turns out that there is room for power.

  Then, the subject of this invention makes it a subject to provide the manufacturing method of a mesh contact body element which is excellent in intensity | strength, and can be applied to a long-term wastewater treatment, and a rotating circular mesh contact body.

  Other problems of the present invention will become apparent from the following description.

  The above problems are solved by the following inventions.

(Claim 1)
In a method for producing a rotating circular mesh contact element by cutting and processing a synthetic resin fiber block formed by forming synthetic fiber yarns into a three-dimensional network, and bonding the intersections of the fiber yarns with an adhesive,
Cutting the synthetic resin fiber block so as to form a fan-shaped shape obtained by equally dividing a disk-like body in the radial direction;
Forming a through-hole for allowing a spacer to be inserted into the fan-shaped mesh-like contactor element precursor; and
Compressing the outer periphery of the mesh-like contactor element precursor and the periphery of the through hole with a hot press to form a compression part;
Thermal pressurization treatment is performed on the entire surface other than the outer periphery of the mesh-shaped contact body element precursor body and the periphery of the through hole so that the space ratio becomes 90% to 98% at a temperature of 90 ° C. to 140 ° C. And a process of
A step of promoting crystallization of the thermocompression-bonded synthetic fiber by providing a static period of 5 days or more after the heat-pressing treatment step;
A method for producing a reticulated contact body element, comprising:

(Claim 2)
2. The mesh contact element according to claim 1, wherein the temperature of the hot press is adjusted to 100 ° C. to 140 ° C. in the step of subjecting the entire surface of the mesh contact element to a hot press using a hot press. Manufacturing method.

(Claim 3)
2. The mesh contact element according to claim 1, wherein the temperature of the heat press is adjusted to 120 ° C. to 140 ° C. in the step of subjecting the entire surface of the mesh contact element precursor to a heat press treatment with a heat press. Manufacturing method.

(Claim 4)
The mesh contact element according to any one of claims 1 to 3, wherein the ratio of the thread weight F of the mesh contact element and the weight L of the adhesive is in the range of 50-60: 50-40. Manufacturing method.

(Claim 5)
The method for producing a mesh contact element according to any one of claims 1 to 4, wherein the stationary period is 8 days or more and 10 days or less.

(Claim 6)
A rotating circular reticulated contact body comprising a plurality of reticulated contact element elements manufactured by the method for manufacturing a reticulated contact element element according to any one of claims 1 to 5 and configured in a circular shape.

  According to the present invention, the space ratio is 90% or more and 98% or less at a temperature of 90 ° C. to 140 ° C. on the entire surface other than the outer periphery of the reticulated contact body element precursor and the periphery of the through hole. Since the process of heat and pressure treatment is adopted, the fiber yarn is not broken, the strength is excellent, and a method for manufacturing a mesh contact element applicable to long-term wastewater treatment and a rotating circular mesh contact body are provided. it can.

  In addition, since the process of promoting the crystallization of the thermocompression-bonded synthetic fibers by providing a static period of 5 days or more after the heat and pressure treatment process, the crystallization of the resin yarn further proceeds and the strength increases. There is an effect to. Conventionally, it was shipped 2 to 3 days after hot pressing and transported the reticulated contact element precursor (because delivery date is fixed), but if it is shaken in the transport process before crystallization is fully advanced There are problems such as unraveling of the yarn, but all of these can be solved.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a perspective view of a main part of a synthetic resin fiber block. As shown in FIG. 1, the synthetic resin fiber block 1 is configured so that synthetic fiber yarns are formed in a three-dimensional network. The synthetic resin fiber block 1 is an original fabric for producing the rotating circular mesh contact body of the present invention, and the intersection of the fiber yarns is bonded by an adhesive.

  The material of the synthetic fiber yarn is not particularly limited, but is preferably a thermoplastic resin, more preferably a vinylidene chloride resin. When using a vinylidene chloride resin, it is preferable to use a fiber yarn having a thickness in the range of 3800 to 4200 denier, and more preferably in the range of 3900 to 4100 denier.

  As the adhesive, latex or the like can be generally used, but a vinylidene chloride resin adhesive is preferable for bonding vinylidene chloride resin fiber yarns.

  The first step of the present invention is a step of cutting the synthetic resin fiber block 1 to produce a reticulated contact body element precursor 2 shown in FIG. The reticulated contact element precursor 2 is formed to have a sector shape obtained by equally dividing a disk in the radial direction. Although the illustrated example is divided into six parts, it is not particularly limited.

  In this cutting process, the through-hole 20 is formed in the fan-shaped mesh contact body element precursor 2 simultaneously or afterwards. The shape of the through-hole 20 does not need to be circular, and may be rectangular, and the number thereof is not limited to the illustration. The through hole 20 functions as a spacer mounting hole as will be described later.

  Next, the features of the method for producing the mesh contact element according to the present invention will be described with reference to FIGS. First, as shown in FIG. 4, the outer periphery 21 of the mesh-like contact body element precursor 2 and the periphery of the through hole 20 are compressed by a hot press machine to form a compressed portion 25, which is formed into a pressure-welded form.

  At the same time as or after the formation of the compression portion 25, the outer peripheral surface 21 of the mesh-like contact body element precursor 2 and the entire surface 22 other than the periphery of the through-hole 20 are subjected to a heat press treatment by a hot press machine (see FIG. 3). Thus, the mesh contact element 4 is obtained.

  The step of compressing the outer periphery 21 of the mesh-like contactor element precursor 2 and the periphery of the through-hole 20 with a hot press 3 to form a compressed portion is also employed in Patent Document 4, and is the present invention. As shown in FIG. 3, the outer peripheral surface 21 of the mesh-like contact body element precursor 2 and the entire surface 22 other than the periphery of the through-hole 20 are subjected to heat and pressure treatment with a hot press 3. By adopting such a process, the rotating reticulated contact body obtained from the reticulated contact body element 4 has an effect of being excellent in strength without unraveling the fiber yarn.

  In the present invention, the temperature of the hot press (contact temperature with the resin yarn) is preferably adjusted to a range of 90 ° C to 140 ° C, more preferably adjusted to a range of 100 ° C to 140 ° C. Yes, and more preferably, the temperature is adjusted to a range of 120 ° C to 140 ° C. If it is less than 90 ° C., the tensile strength decreases, which is not preferable, and if it exceeds 140 ° C., the fiber yarn may be melted, which is not preferable.

  The space ratio of the network contact element after hot pressing is preferably 90% or more and 98% or less, more preferably 92% to 97%, and still more preferably 93% to 96%. The larger the contact surface area of the contact body, the better. However, the space ratio is reduced accordingly, and the problem of oxygen supply capacity and sludge blockage in microbial treatment occurs. The range of the space ratio is found from the relationship with the strength.

  Next, the present invention includes a step of promoting crystallization of the thermocompression-bonded synthetic fiber by providing a stationary period of 5 days or more after the above-described heat and pressure treatment step. The stationary period is preferably 8 days or more and 10 days or less.

  The stationary period is to promote the crystallization of the thermocompression-bonded synthetic fiber yarn, and it is allowed to stand still for the number of days during which the crystallization (animation) is completely advanced, thereby improving the strength of the rotating circular mesh contact body as a product. We found it preferable above.

  In the present invention, stationary means widely includes an action of moving a product in addition to movement by transportation such as shipment. If the rest period is less than 5 days, it does not adhere completely and the tensile strength is inferior.

  In the present invention, the ratio of the thread weight F of the mesh contact element and the weight L of the adhesive is preferably in the range of 50-60: 50-40. There is an effect that contributes to improvement of the strength of the reticulated contact body element (particularly, improvement of tensile strength).

  Next, a rotating circular mesh contact body and a rotating circular mesh contact body processing apparatus using the same will be described.

  FIG. 5 is a schematic cutaway side view of an essential part showing an example of a rotating circular mesh contact body processing apparatus using the rotating circular mesh contact body of the present invention, and FIG. 6 is a schematic sectional view taken along line VI-VI of the above.

  The rotating circular reticulated contact body of the present invention is obtained by combining a plurality of reticulated contact element 2 obtained as described above into a circular shape. In the example shown in FIG. 6, six reticulate contact body elements 2 are combined to form a circular rotating circular reticulated contact body 30.

  In the figure, reference numeral 50 denotes a contact tank. The contact tank 50 has a constant liquid level, and the lower part of the plurality of rotating circular mesh contacts 30 is immersed under the liquid level.

  A diffuser pipe 51 for supplying air to each of the rotating circular mesh-like contact bodies 30 is provided at the bottom of the contact tank 50. The air diffuser 51 is connected to, for example, a blower (not shown). A cover 52 may be provided above the contact tank 50, and an inspection port 53 may be provided in the cover 52. Reference numeral 54 denotes a frame. Spacers 55 are inserted into the through holes 20 of the rotating circular mesh-like contact body 30, and both ends of the spacers 55 are fixed to support plates 57 attached at right angles to the main shaft 56. As a result, the individual rotating circular mesh contacts 30 are kept at a predetermined interval by the spacers 55, and a module comprising a plurality of rotating circular mesh contacts 30 is formed. The main shaft 56 of the rotating circular mesh contact body is connected to the drive source 58. Although the structure of the drive source 58 is not specifically limited, For example, it has the motor 59 with a reduction gear, the power transmission mechanism 60, and the bearing 61. FIG.

  Since the above apparatus is rotated by immersing a part of the rotating circular mesh contact body 30 in the liquid in the contact tank as shown in FIG. 6, microorganisms adhere to the yarn surface of the rotating circular mesh contact body 30. When in a state, the organic matter is decomposed by such microorganisms, the microorganisms grow in accordance with the microbial conversion of the organic matter, the amount of microorganisms adhering to the yarn surface increases, and the organic matter in the waste water can be treated continuously. For specific examples of processing, JP-A-2001-79581 can be cited.

  Hereinafter, the effect of the present invention is illustrated by examples.

Example 1-4
A synthetic resin fiber block having a thickness of 50 mm, a width of 1000 mm, and a length of 2000 mm was cut to form a mesh-like contactor element precursor as shown in FIG. 2 and provided with six through holes.

  The periphery of the through-hole, the periphery of the mesh-like contactor element precursor, and the entire surface of the mesh-like contactor element precursor were hot-pressed (pressed) with a hot press. The heating temperature was set to 140 ° C.

  With respect to the obtained reticulated contact element, the tensile strength and the elongation were measured based on JIS (L) 1096 when the rest period was 0 hours, 17 hours, 41 hours, and 137 hours. The bulk specific gravity was also measured. The results are shown in Table 1. The values in the table are average values of three samples (n = 3).

Reference examples 1 and 2
In Example 1, a reticulated contact element was prepared in the same manner except that the entire surface of the reticulated contact element precursor was not hot-pressed, and the tensile strength and elongation were measured when the rest period was 0 hours and 137 hours. did. The bulk specific gravity was also measured. The results are shown in Table 1. The values in the table are average values of three samples (n = 3).

Perspective view of essential parts of synthetic resin fiber block The perspective view which shows an example of a mesh-like contact body element precursor The figure which shows the state of the hot press with the hot press machine A perspective view showing an example of a mesh contact body The principal part notch schematic side view which shows an example of the rotation circular mesh contact body processing apparatus using the rotation circular mesh contact body of this invention Schematic sectional view taken along line VI-VI

Explanation of symbols

1: Synthetic resin fiber block 2: Reticulated contact element element precursor 20: Through hole 21: Outer periphery 22: Entire surface other than the periphery of the through hole 25: Compression section 3: Hot press machine
4: Reticulated contact element 30: Rotating circular reticulated contact body 50: Contact tank 51: Air diffuser 52: Cover 53: Inspection port 54: Mounting base 55: Spacer 56: Main shaft 57: Support plate 58: Drive source 59: Motor 60: Power transmission mechanism 61: Bearing

Claims (6)

In a method for producing a rotating circular mesh contact element by cutting and processing a synthetic resin fiber block formed by forming synthetic fiber yarns into a three-dimensional network, and bonding the intersections of the fiber yarns with an adhesive,
Cutting the synthetic resin fiber block so as to form a fan-shaped shape obtained by equally dividing a disk-like body in the radial direction;
Forming a through-hole for allowing a spacer to be inserted into the fan-shaped mesh-like contactor element precursor; and
Compressing the outer periphery of the mesh-like contactor element precursor and the periphery of the through hole with a hot press to form a compression part;
Thermal pressurization treatment is performed on the entire surface other than the outer periphery of the mesh-shaped contact body element precursor body and the periphery of the through hole so that the space ratio becomes 90% to 98% at a temperature of 90 ° C. to 140 ° C. And a process of
A step of promoting crystallization of the thermocompression-bonded synthetic fiber by providing a static period of 5 days or more after the heat-pressing treatment step;
A method for producing a reticulated contact body element, comprising:   2. The mesh contact element according to claim 1, wherein the temperature of the hot press is adjusted to 100 ° C. to 140 ° C. in the step of subjecting the entire surface of the mesh contact element to a hot press using a hot press. Manufacturing method.   2. The mesh contact element according to claim 1, wherein the temperature of the heat press is adjusted to 120 ° C. to 140 ° C. in the step of subjecting the entire surface of the mesh contact element precursor to a heat press treatment with a heat press. Manufacturing method.   The mesh contact element according to any one of claims 1 to 3, wherein the ratio of the thread weight F of the mesh contact element and the weight L of the adhesive is in the range of 50-60: 50-40. Manufacturing method.   The method for producing a mesh contact element according to any one of claims 1 to 4, wherein the stationary period is 8 days or more and 10 days or less.   A rotating circular reticulated contact body comprising a plurality of reticulated contact element elements manufactured by the method for manufacturing a reticulated contact element element according to any one of claims 1 to 5 and configured in a circular shape.

Images