JPH0148080B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a water treatment contact material comprising a comb-like sheet in which crimped threads are arranged substantially in parallel.

Recently, fixed bed catalytic oxidation methods using biofilms have been attracting attention among biological wastewater treatments such as activated sludge methods. This fixed-bed catalytic oxidation method involves filling an aeration tank with a contact material to which microorganisms can easily adhere, and then bringing the wastewater into contact with air to oxidize the biofilm that has grown epiphytically on the surface of the contact material, and then performing adsorption treatment. It is a system that Conventionally used contact materials in this case include plastic modules with corrugated plates such as honeycomb tubes, or strings in the form of blinds. When used, it is necessary to tie the strings forming the blinds one by one to the support rods or to fix them by gluing them, which requires time-consuming and inefficient work. In addition, with conventional string contact materials, it is necessary to increase the contact surface area in order to increase the degree of contact with wastewater and increase treatment efficiency, so the strings are woven in a loop around the core material or It requires special processing that is different from the processing methods normally applied to commercially available fibers, such as brushing the body to make it brush-like, and it takes a great deal of effort and time to produce it. It was inconvenient.

In view of the above points, the present invention includes, as a contact material,
This method uses crimped synthetic fiber yarn, which focuses on the fact that synthetic fibers can be easily crimped artificially. Most of the fibers commonly used today have some degree of curl, but are strong enough to not disappear under a given load.
Also, those that have a certain degree of regularity are particularly called crimps. This crimp can be artificially shaped and applied by utilizing the plasticity of fibers, and is performed on various synthetic fibers, semi-synthetic fibers, and other plastic fibers. In particular, synthetic fibers and semi-synthetic fibers can be given great crimpability and bulk by heat treatment or heat setting.
For example, stretch yarn produced using a normal false twisting machine is given great crimpability and bulkiness, has a large elastic elongation due to the elongation of the crimp, and can be rolled up by dry heat, moist heat, etc. It has the property of changing its contracted form.

As described above, the present invention provides water treatment with extremely high wastewater treatment efficiency using crimped yarns of synthetic fibers and semi-synthetic fibers that can be easily artificially imparted with crimpability and bulkiness. The purpose is to provide contact materials.

That is, the water treatment contact material of the present invention is composed of a blind-like sheet in which a plurality of crimped threads are arranged approximately parallel to each other, and the plurality of crimped threads are arranged at a plurality of locations in the longitudinal direction including at least the upper and lower edges. This is a water treatment contact material characterized by having a band-like portion connecting crimped yarns.

Hereinafter, the configuration of the present invention will be explained in detail based on examples. FIG. 1 is a perspective view of an embodiment of a water treatment contact material according to the present invention. The water treatment contact material 1 consists of a crimped yarn 2, and the crimped yarn 2 is made of thermoplastic synthetic fibers such as polyamide, polyester, polyolefin, polyvinyl chloride, polyacrylonitrile, and semi-synthetic fibers such as cellulose acetate. It is processed by a general crimping method such as a false twisting method, a pressing method, a scratching method, or a shaping method, and is given great crimpability and bulkiness. As shown in the figure, a plurality of these crimped yarns 2 are arranged almost parallel to form a blind-shaped sheet 3, and the sheet 3 is placed at multiple locations in the longitudinal direction, that is, at the upper edge and lower edge, or at the upper edge. , glued or woven into a strip 4 at the middle and lower edges,
An upper edge strip 4a, an intermediate strip 4b, and a lower edge strip 4c connect the plurality of crimped yarns 2, and the water treatment contact material 1 is applied to the upper edge strip 4a in an aeration tank (Fig. (not shown) is equipped with a hanging device 5 for hanging it inside. The water treatment contact material 1 can be installed in the aeration tank by using the above-mentioned hanging tool 5, or by attaching the upper edge strip 4a and the lower edge strip 4c of the water treatment contact material 1. There are other mounting methods available, such as supporting it with a support such as a frame or support rod, or fixing it with nails or adhesive.

Next, FIG. 2 is a simplified side view showing an example of a method for manufacturing a water treatment contact material in which each strip is bonded with an adhesive.

A plurality of crimped yarns 2 pulled out from a crimped yarn-wound body F are separated by a predetermined interval by a guide G and arranged substantially in parallel to form a blind-like sheet 3, which is pulled by a winding roller R. arrow A
proceed in the direction. An adhesive application device B and a heating device H are disposed in the middle of the course, and adhesive is applied from the adhesive application device B to the sheet 3 in a strip 4 across the entire width of the sheet 3 at right angles to its traveling direction. Then, the adhesive application portion is heated by a heating device H to continuously fix the crimped yarns. In other words, the sheet 3 being pulled by the take-up roller R and traveling in the direction of arrow A.
First, temporarily stop at the adhesive applying device B,
After applying adhesive to the sheet 3 from the adhesive application device B to the strip 4, the adhesive is applied to the strip 4 again and the adhesive is applied to the strip 4.
When the portion of the sheet 3 applied thereto advances to the heating device H, it is temporarily stopped again, and the applied adhesive is heated to bond and connect the crimped yarns 2 in the sheet 3. At this time, adhesive is simultaneously applied from the adhesive application device B in the same manner as described above to the entire width of the sheet 3 temporarily stopped at the location of the adhesive application device B, and the sheet 3 is made to advance again. The water treatment contact material 1 is manufactured by winding it up with a winding roller R while repeating the above operations. Therefore, in this method, the distance between the adhesive applying device B and the heating device H may be determined based on the required distance between the strips.

The adhesive to be used may be a thermoplastic synthetic resin such as polyvinyl chloride or polyacrylic, or a thermosetting synthetic resin such as epoxy or urethane.

In addition, in this method, since at least 10 or more usually 100 or more crimped yarns 2 are arranged almost parallel in a sash-like pattern, adjacent crimped yarns 2 become intertwined, causing yarn breakage and guides due to entanglement. Yarn may become stuck in the hole, but in such a case, increase the winding tension of the winding roller R and stretch the crimped yarn 2 to temporarily remove the crimp and straighten the yarn. Make it into a shape and roll it up.

In addition to forming the band portion 4 using only adhesive as described above, the band portion 4 may be formed by using an appropriate length of plastic film or fabric such as woven or knitted fabric or non-woven fabric over the entire width of one or both sides of the blind sheet 3 using adhesive. It can be formed by gluing or sewing. Furthermore, the belt-like portion 7 can be woven into an appropriate length by using the crimped yarns 2 arranged in a sash pattern as warp yarns and other yarns as weft yarns, or knitted into an appropriate length using a warp knitting structure. It may also be formed by

When using the water treatment contact material of the present invention produced as described above, an appropriate strip is cut according to the size of the aeration tank, and a hanging tool or the like is attached to the strip.

The water treatment contact material according to the present invention has the above-mentioned structure and is an aggregate of fine crimped filaments with a large surface area, and has a large apparent volume and a high porosity compared to normal systems. It has a large bulkiness, so there is no blockage caused by proliferating microorganisms, and the fluidity of the liquid is extremely good.
It has a helical structure due to dimensional crimp strain, and because it is not an inner-hard and outer-soft structure consisting of a core material and fluff like conventional strings, it is easy for microorganisms to grow on it, and therefore It is a contact material on which microorganisms are uniformly attached, and by adjusting the degree of crimp and stretch of the crimped yarn that forms the contact material, it is possible to control the degree of filling in the aeration tank. As a result, the contact material can have any density suitable for the processing purpose, and since it has strips at appropriate intervals, each yarn does not become tangled, making it easy to handle. It is an excellent water treatment contact material that has many advantages not found in the past, including the fact that the method for producing the material is extremely simple.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of the water treatment contact material according to the present invention, and FIG. 2 is a simplified side view of the manufacturing process thereof. 1...Water treatment contact material, 2...Crimped yarn, 3...
... Sheet, 4 ... Band-shaped portion, F ... crimped thread-wound strip, G ... Guide, B ... Adhesive application device, H ...
...Heating device, R... Winding roller.

Claims (1)

[Claims] 1. A strip-shaped sheet consisting of a blind-like sheet in which a plurality of crimped yarns are arranged approximately parallel to each other, and connecting the plurality of crimped yarns at multiple locations in the longitudinal direction, including at least the upper and lower edges. A water treatment contact material comprising: