JPH0592196A - Contact material for treating waste water - Google Patents

Abstract

PURPOSE:To improve the adhesion of sludge to a contact material in the contact material immersed in waste water to be treated and treating waste water by bonded bacteria. CONSTITUTION:A yarn material obtained by the mixed spinning of usual cotton 1, thermally shrunk cotton 2 and thermally welded cotton 3 is heat-treated to obtain a contact material. The yarn material becomes bulky by this heat treatment and many fine gaps can be formed and the adhesion of sludge is markedly enhanced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a contact material for wastewater treatment, which is immersed in wastewater to be treated and treats the wastewater with attached microorganisms.

[0002]

2. Description of the Related Art As a wastewater treatment device for treating domestic wastewater, industrial wastewater, sewage, etc., it is known that a contact material is placed inside a treatment tank and the contact material is immersed in the wastewater to be treated. ing. In the wastewater to be treated, microorganisms adhere to the contact material, and the microorganisms decompose the organic substances in the wastewater to perform the treatment.

Conventionally, as the contact material, a plastic plate, a corrugated plate, various molded products and the like have been generally used. Further, a contact material using a monofilament product or a fiber product is also known. For monofilament products, it is customary to use non-woven fabrics or fabrics. Most fiber products are formed into a string shape or a tape shape and use filaments as the material.

[0004]

However, such a conventional one has a drawback that sludge is unlikely to adhere to the contact material, and conversely, sludge once adhered is easily peeled off. Further, when the contact material is shocked, there is a problem in that the sludge that has adhered to the contact material is peeled off at one time, which causes fluctuations in water quality and fluctuations in treatment performance.

SUMMARY OF THE INVENTION It is therefore an object of the present invention to solve the above problems and provide a contact material having good sludge adhesion.

[0006]

In order to achieve the above object, the present invention provides a contact material which is immersed in wastewater to be treated and which treats the wastewater by adhering microorganisms, using a normal fiber, a heat-shrinkable fiber and a heat-melting material. This is a structure in which a yarn material obtained by mixing spun fibers with bonded fibers is heat-treated.

[0007]

According to such a construction, when the mixed spun yarn material is heat-treated, it becomes bulky and many fine voids are created, so that the sludge adhesion is remarkably improved.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a material model of a thread material for constituting a contact material of the present invention. As shown, this material
This is a spun yarn obtained by mixing plain cotton 1, heat shrinkable cotton 2 and heat fusible cotton 3 together. Then, when this is made into a thread or woven shape and heat-treated, the heat shrinkable cotton 2 shrinks and becomes bulky as shown in FIG. Appropriate rigidity is imparted. By changing the compounding ratio of the ordinary cotton 1, the heat-shrinkable cotton 2, and the heat-sealing cotton 3, it is possible to configure a contact material according to a desired application.

Next, the thus heat-treated product is shown in FIG.
As shown in FIG. 3, a weft yarn 4 having a large diameter is formed, and a warp yarn 5 having a small diameter is partially arranged on the weft yarn 4 as shown in the drawing to form a woven fabric. Next, the intermediate portions of the warps 5 are cut along the cutting lines 6 to obtain the contact material forming unit 7 as shown in FIG. At this time, the heat-bonded cotton 3 contained in the yarn as described above.
Since twists and the like are fixed by this, the occurrence of "raveling" at the cutting portion is prevented. Then, by twisting the single body 7 around the warp yarn 5, as shown in FIG. 5, the respective weft yarns 4 are spirally arranged around the warp yarn 5 and protrude radially, and these are dispersed and independent from each other. Can be obtained.

In other words, the weft yarns 4 are arranged in a tuft around the warp yarns 5, and by self-holding in the shape by a heat curing treatment or the like, each one having an appropriate rigidity as described above. Since the wefts 4 of the book exist independently in the water to be treated, there is a feature that the sludge adhesion area becomes large. Moreover, as shown in FIG. 2, it is in a bulky state due to the heat treatment, a large number of fine voids are formed, the surface area is large, the sludge adhesion is remarkably improved, and high load treatment becomes possible. In addition, the retention of the attached sludge becomes good.

Since the weft yarn 4 is fixed to the warp yarn 5 at its central portion, both ends thereof are free ends and can be swung by the water flow of the waste water treatment facility. Therefore, excess sludge attached to the surface of the thread is washed away, and only a relatively constant amount of sludge can be retained. Therefore, it is possible to prevent the situation in which the adhered sludge fills the voids of the weft yarn 4 and becomes anaerobic, which inhibits the activity of microorganisms. In addition, sludge is not clogged between yarns, and stable and high processing performance is always exhibited.

The bulkiness, the porosity, the yarn thickness, the hardness, the density, etc. can be arbitrarily changed depending on the selection of the raw cotton to be used, the mixing ratio, the yarn count, the woven and knitting structure, the heat treatment condition and other processing conditions. .. Therefore, suitable conditions can be set according to the properties of the wastewater to be treated and the characteristics of the treatment facility.

FIG. 6 shows another embodiment of the contact material according to the present invention. Here, a knitting structure as shown in the drawing is adopted, and a loop-shaped thread material 9 is radially projected from the central thread 8. With such a contact material, it suffices to knit a knitted fabric as shown in the figure and twist the knitted fabric, and the cutting work unlike the woven structure of the previous embodiment is unnecessary. For this reason, the occurrence of "raveling" associated with cutting is reliably prevented.

In the above description, as the contact material of the present invention, as shown in FIG. 5 and FIG. 6, a tuft-like shape in which each weft thread 4 radially projects is illustrated, but only such a form is provided. It is not limited. For example, in a general wastewater treatment facility, the treatment tank is often configured in a plurality of stages, but the tuft-like contact material described above is particularly useful in the first stage treatment tank having a high organic matter concentration. However, it is not always necessary to use it in the second and subsequent treatment tanks having a reduced organic matter concentration. This is because, in such a place, it may be more appropriate to adopt another appropriate form.

[0015]

As described above, according to the present invention, the contact material that is immersed in the wastewater to be treated and that treats the wastewater by the adhering microorganisms is a normal fiber, a heat shrinkable fiber, and a heat fusion fiber. Since the mixed spun yarn material is heat-treated, it becomes bulky and many fine voids are formed, so that the sludge adhesion can be significantly improved. For this reason, the adhesive strength between the contact material and the sludge is increased to prevent the sludge from peeling off, and the surface area of the contact material is increased to enable high load treatment.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a model of a thread material for a contact material according to an embodiment of the present invention.

FIG. 2 is a schematic diagram showing a state after heat treatment of the thread material of FIG.

FIG. 3 is a view showing a fabric structure for manufacturing the contact material.

FIG. 4 is a diagram showing the structure of a single body after the woven structure of FIG. 3 is cut.

5 is a view showing a contact material obtained by twisting the single body of FIG.

FIG. 6 is a view showing a contact member according to another embodiment of the present invention.

[Explanation of symbols]

 1 Normal cotton 2 Heat shrinkable cotton 3 Heat fusion cotton 4 Weft 5 Warp

Claims (1)

[Claims] 1. A contact material which is immersed in wastewater to be treated and which treats the wastewater with adherent microorganisms,
A contact material for wastewater treatment, characterized in that a yarn material obtained by mixing and spinning ordinary fibers, heat-shrinkable fibers, and heat-fusion fibers is heat-treated.