JPH024359B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a contact material for water treatment that is used by being stretched inside an aeration tank or in a river.

(Prior Art) Recently, among biological wastewater treatments such as activated sludge methods, fixed bed catalytic oxidation methods that utilize biofilms have been attracting attention. This fixed-bed catalytic oxidation method involves filling an aeration tank with a contact material to which microorganisms can easily adhere, and bringing wastewater into contact with the biological film that has grown and grown on the surface of the contact material. It is a system that oxidizes and adsorbs. 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. There are materials etc.

(Problem to be solved by the invention) Fixed beds using synthetic resin net contact materials as contact materials for water treatment are easy to install in an aeration tank, but over time, attached biofilm grows. This causes the meshes to become clogged, making it difficult for water to pass through, so in order to prevent this, the mesh spacing must be widened, and as a result, there is a drawback in that the contact area between water and attached biofilm cannot be increased. Also, JP-A-51-
When using the band-shaped string described in Publication No. 128835 as a contact material, the biofilm adhesion efficiency is high because the material is made of fine fibers, and the string has flexibility. It vibrates due to the circulating water flow in the aeration tank and does not become clogged, but the strings that form the band become fine rod-shaped due to biofilm, so the amount of biofilm captured is small, and the characteristics of the fibers (gaps between fibers) ) could not be used effectively. There was also the problem that this would break down as time passed in the aeration tank.

When each of the above-mentioned contact materials is actually stretched in the aeration tank, the air insertion pipe 8 and the contact material 1 are stretched separately in the aeration tank 7, as shown in the schematic diagram in Fig. 4. Therefore, uniform stirring in the aeration tank using air was difficult.

In view of the above points, the present invention captures biofilm three-dimensionally, has a large capture capacity, and has low water flow resistance.
Moreover, the present invention aims to provide a contact material for water treatment which has many advantages such as high strength, easy transportation and construction, and uniform agitation by air in an aeration tank.

(Means for Solving the Problems) The present invention is a pipe in which the upper end of the core is connected to an air introduction pipe, and the lower end has a blowing part,
The sheath part is a cylindrical braided string with a loop,
The present invention provides a contact material for water treatment, characterized in that the sheath portion is fixed to the core portion.

Embodiments of the present invention will be explained below with reference to the drawings. FIG. 1 is an enlarged front view of the main part, and FIG. 2 is a schematic cross-sectional view. The contact material 1 for water treatment has a sheath portion of a cylindrical string portion 2 made of a knitting structure similar to a braided cord, and this string portion 2 extends over the entire length in the length direction.
It has numerous loop parts 3 formed to protrude on both sides of the pipe, and is located inside the tubular string part 2 and is fixed to the string part 2 with an adhesive 4. There is a part 5, and the tip of the core part has a fume part structure 6 having a large number of fine holes.

The material of the string portion 2 of the contact material for water treatment of the present invention 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 fibers made of a mixture thereof. A filamentous material is appropriately selected and used as required.

The countless loops 3 that are formed so as to overhang on both sides of the string section 2 are yarn loops that are formed according to the knitting pitch during string production, but when this yarn is made of multifilament, This is referred to as innumerable because an innumerable number of loops of single filament are formed.

The loop is designed to be twisted in use. Moreover, the size of this loop is preferably 2 to 40 cm in diameter. The loop portions 3 are not necessarily provided on both sides of the string portion 2, that is, in two directions when viewed from the cross section of the string portion 2, but may be provided in three or four directions.

Note that even if one step is added and the loop is cut to obtain a string portion having tufted threads, the effects of the present invention will not be diminished.

The pipe-shaped core 5 is made of polyvinyl chloride,
In addition to molded products made of synthetic resins such as nylon, polyurethane, and polyethylene, iron or steel pipes can also be used.

FIG. 3 is a schematic diagram of an aeration tank according to the present invention. The upper part of the core pipe is connected to an air insertion pipe 8, so that air passes through the inside of the pipe and air is atomized from the lower part of the pipe. It's getting old. For this reason, the lower part of the pipe has a hole as the fumarole part 6, but the size and position of this hole do not need to be particularly limited as long as this purpose can be achieved, but the size of the hole may vary depending on the size of the hole, since there are many fine holes. is preferred.

The number of test tubes may be arbitrarily determined depending on the size of the fumarole tank 7.

In order to fix the string part 2 of the sheath part to the core part 5, it is possible to physically hook the sheath part to the core part 5, but it is possible to fix the sheath part 2 to the core part 5. A method of fixing with an adhesive is more preferable since it can be used without any problems.

(Function) In the present invention, the air insertion tube 8 and the pipe-shaped core portion 5 of the contact material 1 are directly connected, and the air emitted from the blowing portion 6 having fine holes attached to the tip of the core portion 5 is used. It eliminates the unstirred area that occurs in the loop portion 3 of the contact material 1, making it possible to treat wastewater with high efficiency, and because the countless loops can capture biofilm three-dimensionally, the capture capacity is large. Become.

(Example) Next, a specific example of the contact material 1 for water treatment according to the present invention will be described.

[Processing method] The string portion 2 used a nylon multifilament of 840 denier as the shaft thread, and the thread of the loop portion 3 that constituted the string portion 2 together with the shaft thread was a nylon multifilament of 1260 denier. The size of the loop was 4 cm in diameter.

A polyvinyl chloride tube with a diameter of 5 m/m was used as the core 5, and a spherical piece made of ceramic having a large number of fine holes was attached to the tip of the core 5 as a blower 6.

The fumarole tank 6 had a capacity of 1 m ³ , and the contact material 1 for water treatment was 65 cm long and 81 pieces were used at intervals of 10 cm. The schematic diagram is the same as FIG. 3.

The water treatment conditions are as follows.

Raw water… Domestic sewage BOD volume load… 0.4-0.8Kg・BOD/m ³ -day residence time… 9.6 hours Treatment time… 1 year [Treatment results] Raw water BOD 160-270mg/ SS 100-180mg/ Treated water BOD 4.5 ~11.6mg/SS 4.0~19.0mg/The treatment results were stable throughout the year. Treated water BOD: 20mg/or less, SS: 30mg/
The following satisfactory results were obtained.

Furthermore, as a result of observing the state of attachment of the biofilm, it was found that the biofilm was firmly attached around the tissue of the loop portion 3.

(Effects of the Invention) The contact material for water treatment of the present invention can capture biofilm three-dimensionally, and can improve the capture capacity. In addition, there is no difficulty in water passage unlike in the case of conventional contact materials made of synthetic resin nets, and sufficient agitation is achieved by the air from the blowhole in the core, making it possible to treat wastewater with high efficiency.

[Brief explanation of drawings]

FIG. 1 is an enlarged front view of essential parts showing an example of the present invention. FIG. 2 shows a schematic cross-sectional view thereof. Third
The figure is a schematic diagram of an aeration tank according to the present invention, and FIG.
FIG. 2 is a schematic diagram of an aeration tank according to a conventional method. DESCRIPTION OF SYMBOLS 1...Contact material for water treatment, 2...String part, 3...Loop part, 4...Adhesive material, 5...Core part, 6...Blowing part, 7...Aeration tank, 8...Air insertion tube.

Claims (1)

[Claims] 1 The upper tip of the core is connected to an air introduction pipe, the lower tip is a pipe with a blowing part, and the sheath is a cylindrical braided string with a loop, and the sheath is attached to the core. A contact material for water treatment characterized by being fixed.