JPH0135279Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a braided cord for use as a contact material for purifying wastewater. BACKGROUND ART Recently, with the spread of purification treatment by the so-called contact aeration method, which utilizes the self-purifying action of microorganisms on wastewater, various forms of contact aeration consisting of string-like bodies formed to allow easy attachment of microorganisms have been developed. material has been proposed. Among these contact materials, those made by forming a large number of uniformly sized ring-shaped bodies (loop shapes) around a thin core material (for example,
No. 56-28199) is considered to be of practical importance because it has the effect of attracting a large number of microorganisms during sewage treatment. However, in the above-mentioned known contact material, since the annular body for attaching microorganisms is formed into a shape of substantially uniform size, as described above, microorganisms colonize the contact material during wastewater treatment. It was found that it could not be said to have the specific surface area necessary to fully exhibit the functions of growth, sludge adhesion, and oxygen dissolution. Problems to be solved by the invention As a result of studying the formation of a specific surface area in order to more effectively exhibit the above-mentioned functions in the contact material of the form described above, the inventor of the present invention found that using a braided cord as the contact material, When forming some of the wires that make up the braid into a loop shape, each loop is formed into a shape with a different size in the longitudinal direction and circumferential direction of the braid cord, thereby making the above function effective for the contact material. The present invention was developed based on the knowledge that it is possible to have a specific surface area that can be exhibited. That is, the present invention provides a contact material made of a braided cord, which has a specific surface area suitable for effectively adhering microorganisms and sludge, and which can purify wastewater more efficiently through the self-purifying action of microorganisms. The purpose is to provide The present invention will be described in detail below with reference to the accompanying drawings. Structure of the invention The feature of the invention is that it consists of a braided cord in which a part of the strands constituting the braided cord is formed into a large number of loop shapes, and the loops are formed into a large number of shapes of different sizes in the longitudinal direction and circumferential direction of the braided cord. It is in the formed sewage contact material. FIG. 1 of the accompanying drawings schematically illustrates the shape of the present invention, and FIG. 2 illustrates an end face thereof. In the figure, 1 is the braid cord, 2, 2
is a loop-shaped body in which a large number of loops are formed in the longitudinal direction and peripheral direction of the braid cord using the strands constituting the braid, and the loops 2 and 2 are formed in shapes of different sizes as shown in the figure. ing. In the present invention, in order to form the loops into shapes of different sizes as described above, at least two types of loops of different sizes are formed when pulling out a part of the strands constituting the braid to form the loops. It can also be carried out by performing a drawing operation so that the loop is formed, but it is also possible to use two or more types of fibers with different heat shrinkability as the strands to form the loop, and to make one of the strands made of these fibers. By pulling out the parts in a conventional manner to form loops of approximately uniform size, and then heat-setting each loop, the different heat shrinkability is utilized to form loops of mutually different sizes. Then, it becomes possible to form a desired loop in a continuous manner. That is, in order to industrially produce the contact material according to the present invention, it is advantageous to use two or more types of fibers having different heat shrinkability as the strands to form the loop as described above. Examples of such fibers having different heat shrinkage rates include a combination of polyvinyl chloride-based and polyvinylidene chloride-based fibers, or polypropylene-based and polyvinylidene chloride-based fibers. Effects of the present invention As mentioned above, the present invention has a braided cord cord formed with a large number of loops of different sizes and shapes in the longitudinal direction and circumferential direction. Compared to a contact material that has many loops of uniform size, the adhesion of active microorganisms and sludge during sewage treatment is much better.
Therefore, the effect of purifying sewage can be further improved. Next, the table below shows the purification effect of wastewater using the present invention. 【table】

[Brief explanation of the drawing]

FIG. 1 schematically illustrates the shape of the present invention for easy understanding, and FIG. 2 illustrates an end view thereof. 1... Braid cord, 2, 2... Loop shaped body.

Claims (1)

[Claims for Utility Model Registration] (1) In a contact material for sewage treatment consisting of a braided cord in which a portion of the wires constituting the braid are formed into a large number of loop shapes, the loops are formed in the longitudinal direction and the circumferential direction of the braided cord. A contact material consisting of a braided cord for sewage treatment, characterized in that it is formed into a large number of shapes of different sizes. (2) A utility model in which loops are formed into shapes of different sizes by using two or more types of fibers with different heat shrinkage coefficients in the wire for forming the loops, and by heat-setting each fiber. Scope of registration claims No.
Contact material described in (1).