JP2013154295A - Water treatment filter medium, method for manufacturing the same, and purification tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To acquire a water treatment filter medium having a container-shaped first carrier having an opening permitting the penetration of a liquid and a second carrier housed in the first carrier, by a simple operation, and to provide a method for manufacturing the water treatment filter medium, and a purification tank having the water treatment filter medium provided therein.SOLUTION: A container-shaped first carrier 1 is integrally shaped so as to have an opening 5 permitting the penetration of a liquid and a porous compressive second carrier 20A larger than the opening dimension of the opening 5 is housed in the first carrier 1 to thus constitute a water treatment filter medium.

Description

  The present invention relates to a water treatment filter medium having a container-shaped first carrier having an opening that allows liquid to enter, and a second carrier housed inside the first carrier, a method for producing the water treatment filter medium, And it is related with the septic tank provided with the filter medium for the water treatment in the tank.

  There exists patent document 1 shown below as prior art document information relevant to this kind of filter medium for water treatment. The filter medium for water treatment described in Patent Document 1 has a structure in which a carrier (first container-like carrier) having a water passage hole is filled with a carrier such as a fiber lump, so that the carrier is used alone. Since the overall shape is larger than that in the case of, for example, when used in a fluidized bed type septic tank, it is said that even a rough screen can prevent outflow and can easily add or recover a carrier.

  Moreover, in patent document 2 shown below as another prior art document information, in the filter medium for water treatment by patent document 1, since each water passage hole provided in the holding | maintenance body is small, a solid organic substance cannot enter easily inside. In addition, in order to improve the problem that organic matter decomposed into liquid by microorganisms is clogged and cannot flow out to the outside, the holder is made up of a large number of linear skeletons so that the porosity on the surface of the holder is increased. It has been proposed to have a constructed spheroid.

  In the filter medium for water treatment described in Patent Literature 1 and Patent Literature 2, the egg-shaped or spherical holding body is symmetrical to each other so that the carrier (second carrier) can be easily stored in the holding body (first carrier). It is formed by joining the upper half body and the lower half body of the shape, and for this purpose, a projecting part for joining is provided on one of the upper half body and the lower half body, and a joining hole is provided on the other side. It is said that.

JP-A-7-88493 (paragraph 0009, FIG. 2) Utility Model Registration No. 3149173 (0008 paragraph, FIG. 1)

  However, in the filter medium for water treatment described in Patent Document 1 and Patent Document 2, in order to complete the filter medium for water treatment, the troublesome process of joining the upper half and the lower half facing each other in a predetermined direction is performed. Was necessary. In addition, since it is necessary to add a step of storing the carrier inside the process, the second half is actually placed with the lower half placed at the top and the second carrier is placed there. A series of cumbersome operations such as covering the upper half with the upper part facing each other and joining the annular end faces of both halves by engaging the joining protrusions with the joining holes is necessary. It was. In addition, when the upper half and the lower half are joined, a part of the second carrier is sandwiched between the joints, which may cause a joining failure.

  Accordingly, an object of the present invention is to provide a water treatment filter medium in which the second carrier is housed in the first carrier with a simpler operation in view of the problems given by the above-described conventional water treatment filter medium. An object of the present invention is to provide a septic tank equipped with a water treatment filter medium and a method for producing such a water treatment filter medium and the water treatment filter medium.

  The characteristic structure of the filter medium for water treatment according to the present invention is that the inside of the container-shaped first carrier integrally formed so as to have an opening that allows liquid to enter is compressed to be porous and larger than the opening size of the opening. It is in the point in which the sex second carrier is accommodated.

  In the water treatment filter medium having the above-described characteristic configuration, since the first carrier is integrally formed in a completed container shape, the upper half and the lower half are arranged in a predetermined direction as in the prior art. There is no need for troublesome processes such as joining them facing each other. Further, since the second carrier is larger than the opening size of the opening, there is no possibility that the second carrier falls out of the opening when used as a water treatment filter medium in a septic tank or the like. The second carrier can be housed at any time through the opening of the first carrier into the integrally formed first carrier.

  Another feature of the present invention is that a single second carrier is accommodated in the first carrier.

In this configuration, when the total volume occupied by the second carrier is the same in the first carrier, the size of the second carrier is larger than the configuration in which a plurality of second carriers are accommodated. When using as a filter medium for water treatment, the possibility that the second carrier falls out of the opening is further reduced.
Further, in this configuration, compared to a configuration in which a plurality of second carriers are accommodated, the angle between the second carriers in the first carrier when the second carrier is accommodated in the first carrier. It is not necessary to control the posture or the like, and as a result, the storing operation is simplified, and the performance of the water treatment filter medium can be homogenized.

  Another feature of the present invention is that the inner shape of the first carrier and the outer shape of the second carrier are similar to each other.

  With this configuration, since the occupation rate of the second carrier relative to the internal volume of the first carrier can be sufficiently increased, a sufficient amount of microorganisms can be propagated inside or on the surface of the second carrier, thereby increasing the processing capacity. It can be a high filter medium for water treatment.

  Another characteristic configuration of the present invention is that the outer shape and inner surface shape of the first carrier and the outer shape of the second carrier are both generally cubic.

  In this configuration, the outer shape of the first carrier is a space-filled solid, that is, a cube that is one of the solids that can be filled with a solid of the same shape in a certain space without a gap. Since the quantity and mass of the water treatment filter medium that can be filled in the bag can be increased, the cost required for transportation can be reduced. In addition, since the outer shape of the first carrier is a cube which is one of the space-filled solids, a large amount of filter medium for water treatment can be applied in the treatment space of a certain volume even inside the septic tank, and high processing capacity is expected. it can. In addition, the manufacturing cost can be reduced because the shape is simple and easy to form compared to other space-filled solids such as truncated octahedrons and rhomboid dodecahedrons.

  Another feature of the present invention lies in that the second carrier is formed by integrating a plurality of carriers housed in the first carrier inside the first carrier.

  In this configuration, the second carrier is placed from the opening to the inside of the first carrier, compared to a configuration in which a single second carrier that is significantly larger than the opening size of the opening is accommodated in the first carrier. The operation of inserting itself can be facilitated.

  The characteristic configuration of the method for producing a filter medium for water treatment according to the present invention includes a step of integrally forming a container-like first carrier having an opening that allows liquid to enter, and an opening of the opening inside the first carrier. And a step of containing a porous, compressible second carrier larger than the size.

  In the method for producing a water treatment filter medium having the above-described characteristic configuration, the first carrier is integrally formed in a container shape, and then the second carrier is accommodated inside the first carrier. A troublesome process such as joining the half and the lower half facing each other in a predetermined direction is completely unnecessary, and a part of the second carrier is sandwiched between the upper half and the lower half. There is no risk of poor bonding. Furthermore, since the second carrier is larger than the opening size of the opening, there is no possibility that the second carrier will fall out of the opening when used as a water treatment filter medium in a septic tank or the like. The second carrier can be accommodated at any time through the opening of the integrally formed first carrier.

  The characteristic configuration of the septic tank according to the present invention is that the filter medium for water treatment according to any one of claims 1 to 5 is provided in the tank.

  In the septic tank having the above-described characteristic configuration, the container-like first carrier is made of a carrier integrally formed, so that it is strong against external force, and the porous second carrier is housed in the internal space, so that the propagation of microorganisms Since the holding capacity is high, a long-term stable treatment can be performed in the septic tank to which the filter medium for water treatment is applied.

It is a perspective view which shows the filter medium for water treatment which concerns on this invention. It is a perspective view which shows the process in which a sponge-like carrier is accommodated in a container-like carrier. It is a perspective view which shows another accommodation process. It is a perspective view which shows another accommodation process. It is a perspective view which shows another accommodation process. It is a perspective view which shows the metal mold | die set for a container-shaped carrier. It is a partially broken perspective view which shows the formation process of the container-shaped carrier by a metal mold set. It is a perspective view which shows the container-shaped carrier by another embodiment. It is a perspective view which shows the modification of the container-shaped carrier of FIG. It is a perspective view which shows another modification of the container-shaped carrier of FIG. It is a perspective view which shows the container-shaped carrier by another embodiment. It is a perspective view which shows the modification of the container-shaped support | carrier of FIG. It is a perspective view which shows another modification of the container-shaped carrier of FIG.

EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring drawings.
The filter medium for water treatment shown in FIG. 1 includes a resin-made container carrier 1 (an example of a first carrier) and a single sponge carrier 20A (an example of a second carrier) housed inside the container-like carrier 1. It consists of.
The outer shape of the container-shaped carrier 1 is generally cubic, and the inner shape of the container-shaped carrier 1 is also generally cubic.

  A plurality of openings 5 that allow the liquid to enter and flow out are formed on all six surfaces constituting the cube of the container-like carrier 1, and a partition portion that separates the plurality of openings 5 provided on each surface The shape of 6 is a cross shape on the four side surfaces except for the upper and lower surfaces in FIG. 1, but the upper and lower surfaces are different from a simple cross shape.

  The sponge-like carrier 20A is made of a porous and compressible material such as foamed polyurethane, and has a cubic shape like the container-like carrier 1, but all the openings 5 are sufficiently larger than the outer dimensions of the sponge-like carrier 20A. Therefore, there is no possibility that the sponge-like carrier 20 falls out of the opening 5 when used as a water treatment filter medium in the septic tank.

  The eight corners of the container-like carrier 1 have rounded shapes so that the corners of the container-like carrier 1 are unlikely to be caught in the opening 5 of the adjacent container-like carrier 1.

The container-like carrier 1 is integrally molded using an injection molding apparatus to be described later, and the sponge-like carrier 20A is accommodated in the container-like carrier 1 after the integral molding step.
In the example shown in FIG. 2, a sponge-like carrier 20 having an apparent volume approximate to the volume of the container-like carrier 1 is accommodated inside the container-like carrier 1.

  Specifically, the volume of the sponge-like carrier 20 </ b> A before being accommodated in the container-like carrier 1 without external force corresponds to 50 to 200% of the volume of the container-like carrier 1. Here, the apparent volume refers to the volume of the outer shape of the sponge-like carrier 20A ignoring pores existing inside or near the surface of the sponge-like carrier 20A.

  The apparent volume of the sponge-like carrier 20A is the same as the inner volume of the container-like carrier 1, and the state where the surface of the sponge-like carrier 20A and the inner surface of the container-like carrier 1 are inscribed is most desirable for biological treatment. The apparent volume of the container-like carrier 1 is 50% or more of the inner volume (if the inner shape of the container-like carrier 1 and the outer shape of the sponge-like carrier 20A are similar, the inner dimensions of the inner shape of the container-like carrier 1 and the corresponding dimensions If the dimension of the outer side of the sponge-like carrier 20A is 80% or more), the sponge-like carrier 20A is remarkably relative to the container-like carrier 1 even while the water treatment filter medium is moved by the water flow in the septic tank or the like. Since movement and posture change are unlikely to occur, microorganisms can be efficiently propagated and retained, and water treatment performance can be improved.

  In addition, if the ratio of the volume of the sponge-like carrier 20A to the inner volume of the container-like carrier 1 is extremely large, the sponge-like carrier 20A receives a large stress from the inner wall surface of the container-like carrier 1, and thus the inside of the sponge-like carrier 20A. However, the apparent volume of the sponge-like carrier 20A is 200% or less of the inner volume of the container-like carrier 1 (the inner shape of the container-like carrier 1). If the outer shape of the sponge-like carrier 20A is similar, the ratio of the inner dimension of the inner surface shape of the container-like carrier 1 to the corresponding outer dimension of the sponge-like carrier 20A is 125% or less). Since the surface of 20A has little shrinkage of the internal pores due to the pressure from the inner wall surface of the container-like carrier 1, and the microorganism can be sufficiently propagated, it is advantageous for the propagation of the microorganism. On the other hand, since the pressure on the container-like carrier 1 due to the expansion of the sponge-like carrier 20A is small, it is not necessary to excessively increase the strength of the container-like carrier 1.

  Usually, the dimensional error of the sponge-like carrier 20A is about ± 10%. Therefore, when the outer shape of the sponge-like carrier 20A is desired to be maintained without crushing the internal pores of the sponge, the size of the sponge-like carrier 20A is 10% of the inner size of the container-like carrier 1. It is desirable to determine the outer dimension of the sponge-like carrier 20A or the inner dimension of the container-like carrier 1 so as to be small (in this case, the minimum variation value of the outer dimension of the sponge-like carrier 20A is the inner dimension of the inner shape of the container-like carrier 1). About 80%). On the contrary, when it is desired to securely fix the sponge-like carrier 20A without moving in the container-like carrier 1 with the intention of suppressing wear caused by the movement of the sponge-like carrier 20A in the container-like carrier 1, the sponge-like carrier 20A It is desirable to determine the outer dimension of the sponge carrier 20A or the inner dimension of the container carrier 1 so that the dimension is about 10% larger than the inner dimension of the container carrier 1 (in this case, the maximum variation in the outer dimension of the sponge carrier 20A). The value is about 125% of the inner dimension of the inner shape of the container-like carrier 1).

  In the example shown in FIG. 2, the sponge-like carrier 20 </ b> A is accommodated inside the container-like carrier 1 through one opening of the container-like carrier 1. During the storing operation, a special dedicated device (not shown) for inserting the sponge-like carrier 20A into the inside of the container-like carrier 1 from the opening 5 while making the sponge-like carrier 20A smaller than the area of the opening 5 is produced. However, it is also possible for the work vehicle to push the sponge-like carrier 20A into the inside of the container-like carrier 1 from the opening 5 by an operation with a fingertip without using a dedicated device.

  The sponge-like carrier 20B used in the example shown in FIG. 3 has a slightly larger outer dimension than the opening 5 provided on the side surface of the container-like carrier 1 in a dry state, and swells when it is immersed in water. A sex sponge is used. When one sponge-like carrier 20B in a dry state is inserted into the container-like carrier 1 through the opening and the container-like carrier 1 is immersed in water, the sponge-like carrier 20B absorbs water and doubles its original volume. It swells as described above and occupies 50 to 200% of the volume of the container-like carrier.

  When the sponge-like carrier 20B shown in FIG. 3 is placed in water in the state of being accommodated in the container-like carrier 1, it gradually absorbs water that has entered from the opening 5 of the container-like carrier 1 and gradually expands. During the relatively long expansion period, the sponge-like carrier 20B is easily adjusted to a reasonable posture that does not receive excessive stress from the inner surface of the container-like carrier 1. For this reason, the possibility of crushing the internal pores of the sponge-like carrier 20B is reduced, and the microorganisms are easily propagated efficiently.

  The sponge-like carrier 20C used in the example shown in FIG. 4 is not a cube, but has a spiral shape wound in a certain direction. When the sponge-like carrier 20C is stretched linearly with both ends thereof, the area of the both end faces is equal to or less than the area of the opening 5. Therefore, the spiral sponge-like carrier 20C can be relatively easily accommodated in the container-like carrier 1 through the single opening 5 while rotating about the spiral axis. Since the sponge-like carrier 20C returns to the original spiral shape after being stored, it is difficult for the sponge-like carrier 20C to fall out from the opening 5, and the apparent volume occupies 70 to 90% of the volume of the container-like carrier 1.

  In the example shown in FIG. 5, a large number of sponge-like carriers 20D having a size equal to or less than the area of the opening are inserted into the container-like carrier from the opening, and one inside the container-like carrier. It is integrated into a lump. As a method for integration, for example, it is possible to employ a method of bonding each other with an adhesive applied to the surface of each small sponge-like carrier 20D. Alternatively, a method may be used in which heating is performed for a short time at a temperature at which only the boundary between the sponge-like carriers 20D is fused while pressing the sponge-like carriers together. The apparent volume of the sponge-like carrier 20D after being integrated occupies 70 to 90% of the volume of the container-like carrier 1.

(Molding equipment)
The container-like carrier 1 has a shape in which a partition part 6A provided on the upper surface 2 and a partition part 6B provided on the lower surface 3 generally complement each other on the projection plane along the upper and lower axis X. .
That is, the partition portion 6B provided on the lower surface 3 and the cross-shaped opening portion formed between the four partition portions 6A provided on the upper surface 2 are substantially coincident in a cross shape in plan view. It has the shape.
Since the container-like carrier 1 has such a special shape, it can be molded using an injection molding apparatus having a mold set shown below.

  The mold set shown in FIG. 6 mainly includes a lower fixed mold 8 for molding the lower surface 3 of the container-shaped carrier 1, an upper movable mold 9 for mainly molding the upper surface 2 of the container-shaped carrier 1, And four side movable molds 10 for molding the four side surfaces 4 of the container-like carrier 1. The four side movable molds 10 include a pair of first side movable molds 10A and 10B arranged to face each other and a pair of second side movable molds 10C and 10D arranged to face each other.

On the upper surface of the lower fixed mold 8, four first-type cores 8A having a cross-sectional shape corresponding to the shapes of the four partition portions 6A to be formed on the upper surface 2 of the container-like carrier 1 are erected upward.
On the lower surface of the upper movable die 9, one second-shaped core 9A having a cross-sectional shape corresponding to the shape of one partition portion 6B to be formed on the lower surface 3 of the container-like carrier 1 is erected downward.

  Each side surface of the four side movable molds 10 has a cross section corresponding to the shape of the four rectangular openings 5 to be formed in a state where the four side surfaces of the container-like carrier 1 are separated by a cross-shaped separation portion 6C. Four fourth-shaped cores 11 having a shape are erected sideways.

  Therefore, the upper end surfaces of the four cores 8A of the lower fixed mold 8 are the upper movable mold 9 so that the core 9A of the upper movable mold 9 is inserted between the four cores 8A of the lower fixed mold 8. When the upper movable mold 9 is moved close to the lower fixed mold 8 until it comes into contact with the flat lower surface, the upper movable mold 9 is moved up and down corresponding to the thickness of the separators 6A and 6B only near the lower surface of the upper movable mold 9 and the upper surface of the lower fixed mold 8. A thin gap space is obtained, and the remaining area is substantially free of gaps including the central portion.

  Next, a pair of the eight cores 11 is pressed against the two opposite sides of the cubic block obtained by the total of the five cores 8A, 9A, 9B in this way. Of the first side movable molds 10A and 10B, and a pair of second side movable molds 10C and 10C, so that a total of eight cores 11 are pressed against the other two side surfaces of the same lump. Move 10D sideways.

  In this way, in the state shown in FIG. 7, the upper movable mold 9, the first side movable molds 10A and 10B, and the second side movable molds 10C and 10D are fixed to the lower fixed mold 8, and the lower fixed mold If the molten resin is injected from the outside through the injection path 8C provided in FIG. 8 and each movable mold is removed after the resin is solidified, the container-like carrier 1 having the shape shown in FIG. 2 is obtained.

(Configuration of septic tank)
In the case of applying the above water treatment filter medium to a septic tank, there may be mentioned a configuration of a septic tank provided with a water treatment filter medium in a fixed bed or fluidized bed tank inside the septic tank. The filter medium for water treatment may be allowed to stand in a fixed bed tank or may be fluidized together with water to be treated in a fluid bed tank. The water treatment filter media container carrier 1 applied to the septic tank is integrally molded and strong against external force. When the water treatment filter media is put into the tank, or depending on the flow of treated water during water treatment, Even if the container-like carrier 1 collides with the inside of the tank or another carrier, the possibility of breakage or wear can be reduced. Further, since the sponge-like carrier 20A is housed inside the container-like carrier 1, the possibility of wear can be greatly reduced, and the propagation / holding ability of the microorganisms is not impaired. Therefore, the biological treatment in the septic tank can be stably performed for a long time.

[Another embodiment]
<1> The container-like first carrier does not necessarily have to be a cube like the container-like carrier 1 shown in the above embodiment, and has a cylindrical shape having a hexagonal outer shape in plan view as illustrated in FIG. It is good also as a container-like carrier.
In the container-like carrier 1 illustrated in FIG. 8, three rod-like partitioning portions 6 </ b> A extend radially outward from the center of the upper surface 2, and the lower surface 3 has projection surfaces along the upper and lower axis X. Three saddle-shaped separators 6B that complement the separators 6A are extended. Two or more openings 5 are formed on all side surfaces.

Further, it is not always necessary to form openings on the upper and lower surfaces and the side surfaces. For example, as illustrated in FIG. 9, there are no openings 5 on the side surfaces, and openings are formed only on the upper and lower surfaces. You may implement with the form. Here, the hexagonal cylindrical container carrier 1 in a plan view can be filled with a space-filled solid, that is, a solid of the same shape in a certain space without a gap under the condition that the direction of the axial center direction is made uniform. It is used as an example other than a solid cube.
The container-like carrier 1 having the shape shown in FIGS. 8 and 9 can be integrally formed by injection molding using the mold set shown in FIG. 6 by changing the shape of the core part.

<2> As illustrated in FIG. 10, a fin-like protrusion 30 protruding toward the center can be integrally provided on the inner surface of the container-like carrier 1. These protrusions 30 have an effect of suppressing the movement and dropout of the second carrier housed therein. The protrusion 30 is not limited to a fin shape but may be a pin shape. Of course, the fin-like or pin-like protrusions can also be applied to the cubic container-like carrier 1 shown in FIGS.
The container-like carrier 1 having the shape shown in FIG. 10 can also be integrally formed by injection molding using the mold set shown in FIG. 6 by changing the shape of the core part.
In the other embodiments shown in FIGS. 8 to 10, the corners of the container-like carrier 1 have a rounded shape as in the embodiments shown in FIGS. In order to do this, the expression of roundness is omitted.

<3> The container-like carrier 1 is not necessarily a space-filled solid, and may be a cylindrical container-like carrier 1 as exemplified in FIGS. In the example shown in FIG. 11, four bar-shaped separators 6A are provided on the upper surface 2 so as to extend in parallel with each other, and the lower surface 13 complements the separators 6A on the projection plane along the upper and lower axis X 4. The book separators 6B also extend parallel to each other. Two or more openings 5 are formed on all side surfaces.

FIG. 11 shows an example in which the opening 5 is formed on all of the upper and lower surfaces, and FIG. 12 shows an example in which the opening 5 is not formed on the side and the opening 5 is formed only on the upper and lower surfaces. 12 is an example in which a fin-like protrusion 30 protruding toward the center is integrally provided on the inner surface of the container-like carrier 1 based on FIG.
The container-like carrier 1 having the shape shown in FIGS. 11 to 13 can be integrally formed by injection molding using the mold set shown in FIG. 6 if the shape of the core portion is changed.

<4> The container-like carrier 1 is not limited to the injection molding method shown in the above embodiment, and can be integrally formed by, for example, the disappearance method. In the vanishing method, for example, a prototype (not shown) in which a convex portion corresponding to the shape of the opening of the container-like carrier 1 is provided on each surface of the cube is made of lost wax or the like, and the prototype has a cubic shape inside. It is confined inside a mold set (not shown), a slurry of ceramic powder containing molten resin or binder is injected into the space formed between the mold and the mold, and the solidified injection is mold Finally, using the difference in melting temperature between the material used for the prototype and the injection, only the prototype is poured out by heating or the like. In the vanishing method, a truncated octahedron or rhombus dodecahedron can be applied as a space-filling solid other than a cube.

  Used as a technique for solving the problems conventionally found in a filter medium for water treatment having a container-like first carrier having an opening that allows liquid to enter and a second carrier housed inside the first carrier. It is a possible invention.

1 Container carrier (first carrier)
5 opening 20A sponge carrier (second carrier)
2 Upper surface 3 Lower surface 4 Side surface 6A Separation part 6B Separation part

Claims (7)

  A water treatment in which a porous and compressible second carrier larger than the opening size of the opening is accommodated inside a container-like first carrier integrally formed so as to have an opening that allows liquid to enter. Filter media.   The filter medium for water treatment according to claim 1, wherein a single second carrier is accommodated in the first carrier.   The filter medium for water treatment according to claim 2, wherein an inner surface shape of the first carrier and an outer shape of the second carrier are similar to each other.   4. The filter medium for water treatment according to claim 3, wherein the outer shape and inner surface shape of the first carrier and the outer shape of the second carrier are both generally cubic.   The filter medium for water treatment according to claim 2, wherein the second carrier is formed by integrating a plurality of carriers housed inside the first carrier inside the first carrier.   A step of integrally forming a container-shaped first carrier having an opening that allows liquid to enter, and a porous and compressible second carrier larger than the opening size of the opening are accommodated inside the first carrier. A process for producing a filter medium for water treatment.   A septic tank comprising the filter medium for water treatment according to any one of claims 1 to 5 in a tank.

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