JPH01249195A - Production of microorganism holding bed for treating water - Google Patents

Abstract

PURPOSE:To expand rings and to increase microorganism holding capacity by knitting pile yarn into a base fabric together with yarn for an open chain structure so as to form many rings along the longitudinal direction and by using the resulting knitted fabric. CONSTITUTION:Pile yarn 13 is knitted into a base fabric A together with yarn 10 for the open chain structure so as to form many rings 14 along the longitudinal direction. The resulting narrow knitted fabric B is used as a core material 15 and the many rings 14 are partially raised from the peripheral surface 15a of the core material 15 to produce a microorganism holding bed C. Curled parts 12 positioned under the rings 14 are lifted up by twisting and the rings 14 are raised by pressing from the lower parts. The rings 14 are expanded and the microorganism holding capacity 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 and external surface area.

[Conventional technology]

2. Description of the Related Art In the treatment of industrial wastewater, household wastewater, etc., biological treatment using a submerged filter bed as shown in FIG. 1, for example, is generally widely employed.

In the apparatus shown in FIG. 1, a large number of microorganism-retaining filter media layers 2.2...2 are suspended in parallel in a treatment tank 1, and the 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 holding bed 3, and FIG.
As shown in FIGS. 2 and 3, which are sectional views taken along the line A-A in the figure, the microorganism holding bed 3 has a core material 4 formed by twisting an elongated cloth into a spiral shape.

It is composed of a large number of fiber threads (loop-shaped piles) 5 erected from the outer peripheral surface of this 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 stretched in either the left or right direction, and then pulled in the vertical direction. A method of applying tension to form a continuous string-like body in the form of a mallet (Japanese Unexamined Patent Publication No. 134965/1983), or alternatively, forming a loop-like pile by using vinylene chloride as a weft on one side of a string-like base fabric knitted in stockinette knitting. 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 radially planted 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 and erected by the knitted yarns of stockinette knitting.

Therefore, in these known methods, the loop-shaped pile is not sufficiently expanded, and therefore the resulting string-shaped contact material has a small microbial holding capacity.

Therefore, the purpose of the present invention is to sufficiently expand the ring (loop-shaped pile) by twisting and expand the microorganism holding capacity of activated sludge, etc., and to improve the above-mentioned drawbacks of the known technology, as well as to improve the external surface area. Another object of the present invention is to provide a method for manufacturing a microorganism holding bed for water treatment.

Means for Solving Problem c] In order to achieve the above-mentioned object, according to the present invention, the I1 structure is vertically continuous, and the curl portions forming this chain structure appear alternately on both the left and right sides. A plurality of open neck knitting yarns and a plurality of large Akebono yarns are connected in parallel to each other, and the opening neck tnW&I
Narrow stockinette knitting is performed by knitting pile yarns together with the open neck knitting yarns into the basic Mivam fabric consisting of inlay yarns knitted into i-woven yarns so as to form a large number of rings along the length direction. A core material is formed by twisting this narrow knitted fabric in a direction in which the ring is pressed up by the curl portion located on one side, and the ring is partially removed from the outer peripheral surface of the core material. It is characterized by being made to stand upright.

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

FIG. 4 shows a tissue diagram of a specific example of the basic fabric used in the present invention.
0 and inlay tissue yarn 11. The open neck knitting yarn 10 is made of polyester fiber, for example, and has a vertically continuous II structure, and is braided so that the curled portions 12, 12, . . . 12 forming this chain structure appear alternately on both the left and right sides. be done. These curled portions 12.12...12 are formed regularly on both the left and right sides, for example, as shown in the fourth figure,
They may appear alternately one after another, or they may appear irregularly, for example, one on the left (not shown), and then three on the right in succession. In the present invention, a plurality of these open neck knitting yarns 10, for example, 3 to 4 yarns, are used in parallel. In addition, the inlay weave yarn 11 is made of vinylidene chloride fiber, for example, and the open neck knit yarn is made of open neck knit yarn so as to join and integrate the plurality of parallel open large corrugated yarns 10, 10, . . . 10. 10.10...10 is knitted across to form base tissue A.

Pile yarn is further knitted into such basic texture fabric A to form a narrow knitted fabric. FIG. 5 is a partially enlarged weave diagram of a narrow stockinette knitted fabric B formed by knitting pile yarns into the basic weave fabric A shown in FIG. , and are knitted to form a large number of rings 14, 14, . This pile yarn 13 may be composed of one fiber, or may be configured by bundling a plurality of fibers.

The narrow knitted knitted fabric B thus formed is further twisted in the direction of the arrow shown in FIG. 5 to form a core material 15 shown in FIG.
A large number of rings 14 are partially erected to form a microorganism holding bed C according to the present invention. At this time, ring 14
a is not stood up.

[Effect]

When the microorganism holding bed C described above is twisted in the direction of the arrow shown in FIG. 5, the curled portion 12 located below the ring 14 is lifted up at the point X, and the ring 14 is pressed from below to stand up. For this reason, the ring 14 is sufficiently expanded, and therefore, as shown in FIG. Performance and processing power are increased.

On the other hand, at the point Y, the curled portion 12 does not exist below the ring 14a, and therefore the ring 14 is not pushed upward by the curled portion 12 like the above-mentioned point X, and is not erected. .

Therefore, the ring 14a is not expanded, and therefore the sixth ring 14a is not expanded.
As shown in the figure, the length of the ring 14a from the outer peripheral surface 15a becomes small, and as a result, the external shape of the microorganism holding bed C becomes as shown in FIG. 7(a), and the external surface area 16 is expanded. . On the other hand, when the ring is completely erected, the outer shape becomes as shown in FIG. 7(b).

Normally, when a microorganism retention bed is used at a high concentration and high load, if all the rings stand up, the adhesion capacity increases, but the amount of sludge adhesion becomes excessive, as shown in Figure 7 (b). This results in a rod-shaped microbial layer with the maximum diameter possible, and the contact area is small, thus limiting the supply of oxygen or nutrients to the microorganisms inside the layer, resulting in an anaerobic state in the case of aerobic treatment.

Even in the case of anaerobic treatment, nutrients are not supplied internally, which limits the processing capacity.

However, when the ring is partially erected as in the present invention, even if the amount of sludge attached is excessive,
), the external shape exhibits a wave-like shape, increasing the external surface area and expanding the contact area, which allows sufficient supply of oxygen or nutrient sources to the inside of the microbial layer, increasing processing capacity. .

〔Effect of the invention〕

As described above, in the present invention, during the twisting process, the ring is sufficiently expanded to expand the microorganism holding capacity of activated sludge and the like, and the external surface area is also expanded, so that the water treatment performance and capacity are sufficiently increased. This invention is practically useful as a microorganism retention bed for 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 one specific example of the microorganism-retaining bed obtained by the present invention, FIG. 7(a) shows the external shape of the microorganism-retaining bed according to the present invention, and FIG. 7(b) shows The external shape of the microorganism holding bed is shown when all the rings are erected. 10... Open neck knitting yarn, 11... Inlay stitching yarn, 12... Curl portion,
13...Pile thread, 14...Ring, 14a...
・Ring, 15... Core material, 15a... Outer peripheral surface,
A...Basic texture fabric, B...Narrow stockinette fabric,
C... Microorganism retention bed. Treasure 1Ω, small 2, answer 3, prisoner Jun 5 area $7 (g)

Claims (1)

[Claims] An open chain stitch yarn that is a vertically continuous chain structure and is braided so that the curls forming the chain structure appear alternately on both the left and right sides, and a plurality of open chain stitch yarns. , a basic knitted fabric consisting of an inlay knitted yarn knitted into the open chain stitch yarn is joined in parallel with each other along with the open chain stitch yarn along the length direction. A narrow knitted fabric is formed by knitting pile yarns to form a ring, and this narrow knitted fabric is twisted in a direction in which the ring is pressed up by a curl portion located on one side to form a core material. 1. A method for manufacturing a microorganism-retaining bed used in water treatment, characterized by forming a core material and partially standing up the ring from the outer peripheral surface of the core material.