JPH01249194A - Production of microorganism holding bed for treating water - Google Patents

Abstract

PURPOSE:To increase microorganism holding capacity by knitting pile yarn into a base fabric together with yarn for a closed chain structure so as to form many rings along the longitudinal direction and by using the resulting narrow knitted fabric. CONSTITUTION:Pile yarn 12 is knitted into the base fabric together with yarn 10 for the closed chain structure so as to form many rings 13 along the longitudinal direction. The resulting knitted fabric B is used as a core material 14 and the many rings 13 are raised to produce a microorganism holding bed C. Force is applied to rings 13a so that the rings 13 are lifted up with the closed chain structure 10b positioned above the rings 13 at positions X as fulcrums, and the rings 13 are lifted up at the positions of rings 13b and raised. The rings 13 are well expanded and the microorganism holding capacity of the bed C is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a microorganism-retaining bed that is used by being placed in the water to be treated when biologically treating industrial wastewater, household wastewater, etc. This invention relates to a manufacturing method for obtaining a holding bed with a large holding capacity.

[Conventional technology]

For example, when treating factory wastewater, household wastewater, etc.
Biological treatment using a submerged filter bed as shown in FIG. 1 has been widely adopted. The apparatus shown in Fig. 3 is constructed by suspending a large number of microorganism-retaining filter media layers 2.2, . ...Constructed by installing a large number of 3 in parallel.

FIG. 2 is a front view of the microorganism-retaining bed 3, and FIG. 3 is a cross-sectional view taken along line A-A in FIG. 2. As shown in FIGS. Twisted in a spiral °
It is composed of a processed core material 4 and a large number of fiber rings (loop piles) 5 erected from the outer peripheral surface of the core material 4.

When carrying out biological treatment, for example, by aerobic treatment, using the above-mentioned submerged filter bed, first, wastewater or wastewater to be treated is introduced into the treatment tank 1, and then a large number of rings 5.5 of the microorganism retention bed 3 are introduced. Activated sludge is held in 5, and air is supplied into the water from an air generator (not shown) to aerate the water to biologically treat wastewater or wastewater.

Conventionally, as a manufacturing method for this type of microorganism retention bed 3, a string-like body made of a large number of ring-shaped fiber bodies on one side of a fabric of arbitrary narrow width is twisted in either the left or right direction, and then pulled in the vertical direction under tension. (Japanese Unexamined Patent Publication No. 49-134965), or by using vinylene chloride as a weft on one side of a string-like base fabric knitted in stockinette knitting to form a loop-like pile. and a string-like contact material in which the string-like base fabric is twisted so that its cross-sectional shape is circular, and loop-shaped piles are planted radially from the outer peripheral surface of the string-like base fabric twisted into a cylindrical shape. A method (Japanese Patent Publication No. 59-38838) is known.

[Problem that the invention seeks to solve]

However, in all of the above-mentioned known methods, a string-like base fabric having a large number of loop-like piles on the negative side is twisted or twisted to have a circular cross section, and the loop-like piles are formed from the outer peripheral surface of the cylindrical string-like base fabric. However, during the twisting or twisting process, the loop-shaped pile is not pressed up by the yarns of stockinette knitting, and therefore, in these known methods, the loop-shaped pile is The strand-shaped pile is not sufficiently expanded, and therefore, the obtained strand-shaped contact material has a small microbial holding capacity.

Therefore, the object of the present invention is to provide a microorganism-retaining bed for water treatment in which the ring (loop-shaped pile) is sufficiently expanded by twisting to expand the microorganism-retaining capacity of activated sludge, etc., and which improves the drawbacks of the above-mentioned known technologies. The purpose of this invention is to provide a method for manufacturing the same.

[Means for solving problems]

In order to achieve the above-mentioned object, the present invention provides a plurality of parallel closed chain yarns and an inlay knitted so as to join these plurality of closed chain yarns together and integrate them. A narrow stockinette knitted fabric is formed by weaving pile yarn into a basic & Il woven knitted fabric consisting of a textured yarn and the closed chain textured yarn so as to form a large number of rings along the length direction. The ring is made of stockinette fabric by means of the closed chain yarn and inlay yarn.
It is characterized by forming a core material by twisting it in the direction in which it is twisted, and by making a large number of rings stand up from the outer peripheral surface of this core material.

Hereinafter, the present invention will be explained in detail using the accompanying drawings.

FIG. 4 shows a texture diagram of a specific example of the basic fabric used in the present invention. This basic &ll fabric A is composed of closed chain texture threads 10 and inlay texture threads 11. The closed eye II tissue threads IO are made of polyester fibers, for example, and are arranged in plural pieces, for example, four in parallel, and the inlay tissue threads 11 are made of, for example, vinylidene chloride fibers, and are made of the above-mentioned plurality of parallel chains &lIN! Thread 10.10...10
Closed eyes M & L so that they are joined together and integrated.
1m yarns 10.10...lO are knitted across to form the basic NMm fabric A.

Pile yarn is further knitted into such basic texture fabric A to form a narrow knitted fabric. FIG. 5 is a partially enlarged and I weaving diagram of a narrow stockinette knitted fabric B formed by knitting pile yarns into the basic texture fabric A shown in FIG. , and are knitted to form a large number of rings 13, 13, . . . 13 along the length, thereby forming an elongated stockinette fabric B. The pile yarn 12 may be composed of a single fiber (or may be composed of a plurality of fibers bundled together).

The narrow knitted fabric B thus formed is further twisted in the direction of the arrow shown in FIG. 5 to form a core material 14 shown in FIG.
A large number of rings 13 are erected from.

A microorganism holding bed C according to the present invention is formed.

[Operation] The microorganism holding bed C described above has the same shape as shown in FIGS. 2 and 3, but when twisted in the direction of the arrow shown in FIG. huge amount m
A force is applied to the ring 13a so that the weaving yarn tOa and the pile yarn 12 lift the ring 13 using the inlay yarn 11 and the closed eye yarn 10b as fulcrums, and the ring 1
The ring 13 rises up at the point 3b. For this reason, the ring 13 is fully expanded and therefore the sixth
As shown in the figure, the length Y of the ring 13 is increased, the capacity for holding microorganisms held therein is expanded, and the treatment performance and capacity are increased.

〔Effect of the invention〕

As described above, in the present invention, during the twisting process, the rings are sufficiently expanded to expand the microorganism holding capacity of activated sludge, etc., and therefore, the water treatment performance and capacity are sufficiently increased.
This invention is practically useful as a microorganism retention bed in the water treatment equipment shown in FIG.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view of a submerged filter bed using the microorganism retention bed according to the present invention, FIG. A cross-sectional view, FIG. 4 shows a tissue diagram of an integrated example of the basic texture fabric used in the present invention, FIG. FIG. 6 shows a partial cross-sectional perspective view of a specific example of a microorganism-retaining bed obtained by the present invention. 10... Closed stitch & I1m thread, 11... Inlay & I1m thread, 12-... Pile thread, 13.13a, 1
3b: = ring, 14: core material, 14a: outer peripheral surface, A: basic texture, B: narrow knitted fabric, C: microorganism retention bed. 1 koi 1 koi 5 koi

Claims (1)

[Claims] The closed stitches are added to a basic knitted fabric consisting of a plurality of parallel closed stitch chain yarns and an inlay stitch yarn knitted so as to join and integrate these plural closed stitch yarns. A narrow stockinette knitted fabric is formed by knitting the pile yarn together with the chain yarn to form a large number of rings along the length, and the ring is connected to the closed chain yarn and the inlay. Twisting in the direction lifted by the tissue threads to form a core material,
A method for producing a microorganism-retaining bed used in water treatment, which comprises erecting a large number of rings from the outer peripheral surface of this core material.