JPH0133199Y2 - - Google Patents

Description

[Detailed explanation of the idea]

The present invention relates to a contact material for water treatment that is used by being installed in an aeration tank or in a river. 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 bringing the wastewater into contact with air to oxidize the biofilm that grows epiphytically on the surface of the contact material, and then performs adsorption treatment. It is a system that Conventionally used contact materials in this case include hard synthetic resin nets, honeycomb modules with a three-dimensional network structure, or contact materials made of synthetic fiber strings arranged in a band shape. Fixed beds using plastic mesh contact materials, such as the former, are easy to install in an aeration tank, but over time, the mesh becomes clogged due to the growth of attached biofilm, making it difficult for water to pass through. Therefore, in order to prevent this, the mesh spacing must be widened,
Therefore, there is a drawback that the contact area between water and the attached biofilm cannot be increased. In the latter case, that is, when the band-shaped string described in JP-A-51-128835 is used as a contact material, the biofilm adhesion efficiency is high because fine fibers are used as the material.
Furthermore, since the string is flexible, it will not vibrate due to the circulating water flow in the aeration tank and will not become clogged.
Since the string forming the band becomes a thin rod shape due to the biofilm, the amount of biofilm captured is small, and the characteristics of the fibers (gaps between fibers) cannot be used effectively. There was also the problem that it would break midway over time in the aeration tank. In view of the above points, this invention has many advantages such as three-dimensional capture of biofilm, large capture capacity, low water flow resistance, high strength, and easy transportation and construction. The purpose is to provide contact materials. In order to achieve this purpose, the contact material for water treatment of the present invention has a cylindrical braided string section, numerous loop sections extending over the entire length of this string section, and a plurality of loop sections located within the cylindrical string section. and a core portion that is fixed to the string portion with an adhesive. Hereinafter, one embodiment of the present invention will be described based on the drawings. In the figure, reference numeral 1 denotes a contact material for water treatment, which includes a cylindrical string portion 2 made of a knitting structure similar to a braided cord, and a cylindrical string portion 2 on both sides of the string portion 2 over the entire length of the string portion 2. It is composed of countless loop parts 3 formed so as to project from the outside, and a core part 5 located inside the cylindrical string part 2 and fixed to the string part 2 by an adhesive 4. It is made to be twisted into a spiral shape when in use. The material of the contact material 1 for water treatment having such a structure may be organic fibers such as natural fibers and synthetic fibers, inorganic fibers such as glass fibers, mineral fibers, and metal fibers, or filament-like or spun-like fibers in which these are mixed. Select and use the following as appropriate. In addition to the above-mentioned materials, the core portion 5 may also be made of, for example, a wire coated with vinyl. Further, as the adhesive 4, hot melt resins (nylon, polyester, polyethylene, ethylene vinyl acetate, etc.), organic solvents (nylon, acrylic, urethane, vinyl chloride, ester, epoxy, etc.) are used. ) or emulsion type (nylon type, acrylic type, urethane type, etc.). Next, to describe a specific example of the material constituting the water treatment contact material 1, the shaft system constituting the string portion 2 is
Using 840 denier nylon multifilament, the threads that constitute the string section 2 and the loop section 3 together with this shaft system are 1260 denier polyester multifilament, and the core section 5 is made of 11 strands of 840 denier nylon multifilament. Use. The diameter of the loop portion 3 is preferably 2 to 40 cm from the viewpoint of the efficiency of attachment of living organisms. The water treatment contact material 1 having such a configuration was installed in an aeration tank to treat domestic sewage, and the treatment status was investigated for about one year. The results are shown in the table below. The material of the contact material 1 for water treatment used in this investigation was the same as that described in the specific example above, and the diameter of the loop portion 3 was 4 cm. Also, the filling amount is 40m/ ^m3
- It was made into a tank.

【table】

[Table] The treatment results are stable throughout the year, and the treated water
Satisfactory results were obtained with BOD of 20 mg/or less and SS of 30 mg/or less. Furthermore, as a result of observing the adhesion status of the biofilm, it was found that the biofilm was firmly attached around the tissue fibers of the loop portion 3. By the way, in the embodiment shown in the drawings, the loop portions 3 are provided on both sides of the string portion 2, that is, in two directions when viewed from the plane, but it is also possible to provide them at equal angles in three or four directions. Adhesion efficiency can be further improved. The contact material for water treatment of the present invention can be implemented as described above, and includes a cylindrical braided string portion, numerous loop portions extending over the entire length of the string portion, and a cylindrical string portion inside the cylindrical string portion. It consists of a core part located at the center and fixed to the string part with an adhesive, and the diameter of the loop part can be increased from 2 cm to 40 cm, and the biofilm can be captured three-dimensionally. The trapping capacity can be improved by using the contact material, and there is no difficulty in water passage unlike the conventional plastic mesh contact material. Furthermore, as mentioned above, since the core is inserted into the string and fixed with an adhesive, the string will not break in the middle over time in the aeration tank, for example, and its strength can be improved. In addition, it has many advantages, such as being light, easy to handle, easy to transport, and requires only a small storage space.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with FIG. 1 being an enlarged front view of the main part, and FIG. 2 being a cross-sectional view. DESCRIPTION OF SYMBOLS 1... Contact material for water treatment, 2... String part, 3... Loop part, 4... Adhesive, 5... Core part.

Claims (1)

[Scope of utility model registration request] A string section knitted into a cylindrical shape, numerous loop sections projecting over the entire length of the string section, and a core section located within the cylindrical string section and fixed to the string section with an adhesive. A contact material for water treatment characterized by comprising: