JPH0530971A - Carrier for culturing microorganism - Google Patents

Abstract

PURPOSE:To obtain the subject carrier capable of stably holding microorganisms and increasing the flow of liquids or produced gases, the transfer of heat, the carrier area, etc., in a reaction system by forming a wiry material having fibers fixed thereon into a helical shape with a prescribed interval kept between the corresponding points. CONSTITUTION:Fibers 3 are fixed to form a wiry material into a helical shape with a prescribed interval 2 kept between the corresponding points. Thereby, microorganisms can stably be proliferated between the fibers. Liquids smoothly flow with the interval to homogenize liquid concentration. As a result, reaction is homogenized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is a base material for supporting microorganisms when producing substances by the action of microorganisms and treating wastes such as exhaust gas and waste water, and a packing material for various bioreactors. Used as.

[0002]

2. Description of the Related Art Conventionally, production of useful substances by microorganisms and decomposition and removal of wastes have been carried out in various fields including fermentation and wastewater treatment. A bioreactor is used as these devices, and microorganisms carry out the reaction, but various devises have been made to make the microorganisms act effectively. For example, the microorganisms are not added to the reaction system as they are, but they are fixed in pellets with polyacrylamide or the like and then filled in an apparatus, or loaded on a carrier such as plastic, ceramic, or fiber. The present invention relates to this carrier. As the function that the carrier should have,
The present invention is a carrier satisfying all of these requirements, including stable retention of microorganisms, ease of flow of reaction liquid, ease of escape of generated gas, ease of heat transfer, and securing of surface area. Conventionally, as a carrier, plastic or ceramic is molded into a cylindrical shape or a saddle shape,
Some fibers are molded into a planar shape or a rod shape, but none have been made to meet the above requirements by the device of the present invention (JP-A-1-242193, JP-B-62-11594). reference).

[0003]

Of the conventional microorganism-supporting base materials (carriers), those having a flat surface and a relatively smooth surface are liable to peel off the formed microbial film, and the reaction conditions of the reaction system must be carefully selected. Attention was required. In order to improve this point, unevenness is formed on a flat plate, or a carrier formed by molding a fiber is made, but it is expected to further improve the reaction surface area, adhesion of microorganisms, ease of handling, etc. There is. The present invention invents a microorganism-supporting substrate (carrier) that simultaneously satisfies stable retention of microorganisms, flow of reaction system liquid and generated gas, heat transfer, increase in carrier surface area, and the like.

[0004]

In order to solve the above-mentioned problems, the present invention fixes a short fiber to a wire material such as metal or plastic, and then spirally maintains a predetermined gap so that the wire materials do not come into contact with each other. A carrier for culturing microorganisms, which is formed by molding. It is desirable that the short fibers are tightly fixed to the wire, and the length of the short fibers is desirably about 40% or less of the diameter of the spiral. Although various fixing methods can be adopted, for example, short fibers can be inserted between two wires twisted together.

The gap between the pitches allows the space at the center of the molded body and the space outside to be communicated with each other depending on the material to be treated and the bacterial species to keep the fluid flow well and to homogenize the reaction system and improve the reaction efficiency. It is necessary to improve. The material of the fiber that can be used here may be any material that can withstand the environment in which it is used and is not particularly difficult to fix to the wire, such as plastic, plastic composite material, carbon fiber, metal, inorganic compound, and natural fiber.

[0006]

[Operation] According to the present invention, since microorganisms can stably grow between fibers, it is difficult for the microorganisms to fall off due to mechanical impact or liquid flow, and the surface area of the fibers of the carrier is increased by forming a dense spiral body. I was able to do it. Furthermore, the gap between the pitches of the spiral body allows smooth flow of the liquid, facilitates uniformization of the liquid concentration, prevents clogging, etc., and does not cause a partial spoilage reaction. It became easier to homogenize.

[0007]

FIG. 1 is a perspective view of an embodiment of the present invention. Here, 1 is the outer diameter of the spiral, 2 is a predetermined gap given to the spiral,
That is, the pitch. 3 is a fiber fixed to the wire. Usually, when the waste water is treated using aerobic bacteria, the desirable fiber diameter 3 is 0.005 to 0.2 mm, the outer diameter 1 of the spiral is 5 to 50 mm, and the pitch 2 of the spiral is 1 to 10 mm. Further, it is desirable that fibers having a length of 0.01 to 20 mm are fixed at intervals of 0.03 to 2 mm.

Incidentally, a nylon fiber having a diameter of 100 μm was fixed in a wire brush shape between two steel wires having a diameter of 300 μm, and the length of the fiber was cut to 500 μm and aligned. Next,
This wire is formed into a spiral body with a diameter of 10 mm at a pitch interval of 5 per 10 mm, cut into a length of 20 mm, and a size of 200 mmφ.
When 2000 pieces were packed in a bioreactor of × 300 mm and Pseudomonas bacteria were used, and the reduction rate of BOD when the waste water was treated was 100, a conventional vinyl chloride cylinder of 10 mmφ × 20 mm and a wall thickness of 1 mm was used. The processing efficiency at that time was 20.

Further, acrylic fibers having a diameter of 10 μm were fixed in a wire brush shape between steel wires having a diameter of 300 μm, and the length of the fibers was set to about 200 μm. Next, this wire rod was molded into a spiral body having a diameter of 7 mm at a pitch interval of 8 wires per 10 mm. The length was cut into 15 mm, 3000 pieces were packed in the same bioreactor as in the above example, and when the reduction rate of BOD when treating wastewater using Pseudomonas was set to 100, the conventional 7 mmφ × 15 mm, meat The treatment efficiency was 25 when a polyethylene cylinder having a thickness of 0.5 mm was used.

[0010]

EFFECTS OF THE INVENTION By using the carrier of the present invention as a microbial decomposition reaction device of a wastewater treatment device, stable operation can be performed against fluctuations in the operating conditions of the reaction device (pH, temperature, turbulence of liquid, etc.). Become. Further, since the diffusion of the liquid can be homogenized, the non-uniformity of the reaction can be prevented. Furthermore, since the microorganisms are evenly distributed in the inter-fiber voids, the surface area that can participate in the reaction is large, and the reaction is uniform and efficient.

[0011] Generally, the same effect can be obtained even when the organic compound (raw material used as a substrate) is used as a microbial carrier of a reactor for producing a useful substance by exchanging with a microorganism.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

[Explanation of symbols]

 1 Spiral carrier diameter 2 Spiral pitch 3 Fiber planted in wire

Claims (1)

Claims: 1. A microbial culture carrier characterized by being formed by spirally forming a wire material on which fibers are fixed with a predetermined gap.