JPH06190385A - Bacteria carrier - Google Patents

Abstract

PURPOSE:To obtain a bacteria carrier excellent in durability and environment resistance and capable of purifying sewage by adding a specific inorg. filler to polyethylene, polypropylene or a mixture thereof and molding the resulting compsn. into a spherical, columnar or hollow cylindrical shape or foaming the same. CONSTITUTION:In a hopper 12, an inorg. filler 0.5-1mm square such as calcium carbonate, calcium sulfate, sirasu sand, a coral powder or a shell powder is supplied to polyethylene, polypropylene or a mixture thereof. Thereafter, the resulting compsn. is melted in a kneader 11 to be extruded and air is blown into the center of the molten compsn. in a nozzle part 15 to extrude a plastic rod 16 having a hollow part 2. The plastic rod 16 is cooled in a water tank 17 and cut by a cutter 18 to form a bacteria carrier 1. The compsn. may be molded into a columnar or spherical shape without forming a hollow part or may be foamed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microbial carrier for purifying sewage in a wide contaminated area such as rivers, lakes and marshes by breeding microorganisms.

[0002]

2. Description of the Related Art Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 51-594515, a net is installed in an aeration tank, and the net is loaded with and propagates microorganisms. A method of removing pollutants such as COD and BOD is known. Further, in Japanese Patent Application Laid-Open No. 53-125359, for that purpose, a plurality of non-woven fabric plates each having a thickness of 10 mm or more are made of synthetic resin fibers such as nylon, vinylidene chloride, and vinyl chloride having a three-dimensional stitch structure. They are arranged in parallel at intervals of 20 to 100 mm so that microorganisms can be carried and propagated on the surface and internal space of these nonwoven fabric plates.

In a wide contaminated area such as rivers, lakes and marshes, the generation of algae such as blue green becomes a problem. Conventionally, the generation of algae is caused by adding lime to absorb phosphorus in water. Was prevented.

[0004]

However, in the above-mentioned conventional method, since the microbial carrier is used in the aeration tank, there is relatively no problem in durability, environment resistance, etc. In a wide contaminated area such as a harbor, because the microbial carrier is placed in a place where it is affected by the severe natural environment such as waves, wind, and ultraviolet rays for a long time, its durability and environmental resistance become important issues. , The conventional microbial carrier could not be applied to wide contaminated areas such as rivers, lakes and harbors.

In addition, in a wide contaminated area such as a river, lake or harbor, in order to prevent the generation of algae such as blue green,
The method of adding lime had only a short-term effect because lime was dispersed in water.

The present invention is intended to solve the above problems and is capable of purifying sewage in wide contaminated areas such as rivers, lakes and harbors by breeding microorganisms for a long period of time while being excellent in durability and environmental resistance. It is an object to provide a microbial carrier that can be used.

[0007]

Therefore, the microbial carrier of the present invention comprises a carrier material obtained by adding an inorganic filler such as calcium carbonate, calcium sulfate, shirasu sand or coral powder, and shell powder to a simple substance or a mixture of polyethylene and polypropylene. It is characterized in that it is formed into a spherical shape, a cylindrical shape or a hollow cylindrical shape, or is formed by foaming these.

[0008]

In the present invention, microorganisms are supported and propagated on the surface and inside space of spherical, cylindrical or hollow cylindrical microorganisms to purify sewage in wide contaminated areas such as rivers, lakes and harbors.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 (A) and 1 (B) are perspective views showing the shape of each embodiment of the microbial carrier of the present invention, FIG. 1 (C) is a diagram for explaining the production method according to the present invention, and FIG. D)
FIG. 3 is a cross-sectional view of the nozzle portion in FIG. 1 (C).

1 (C) and 1 (D) show an apparatus for producing a microbial carrier of the present invention. The kneader 11 includes a hopper 12, an extrusion screw 13, a heater 14 and a nozzle portion 1.
It consists of 5. To the hopper 12, a carrier material prepared by adding 0.5 to 1 mm square of calcium carbonate to a simple substance or a mixture of polyethylene and polypropylene is melted and extruded in the kneading machine 11, and the center of the melt at the nozzle portion 15. When air is blown toward the portion, the plastic rod 16 having the hollow portion 2 is pushed out from the tip of the nozzle portion 15. The hollow plastic rod 16 is cooled while passing through the water tank 17, cut into a desired length by a cutting machine 18, and the microorganism carrier 1 shown in FIG. It

The microbial carrier 1 has an outer diameter of 6 mm.
The inner diameter of the hollow portion is about 1 mm and the length is about 3 mm, but the dimensions are not particularly limited in the present invention. It should be noted that it may have a cylindrical shape as shown in FIG. 1A or a spherical shape without forming a hollow portion. In addition, as a method of use, many of the microbial carriers 1 are
It can be used by inserting it into the fishing net 4 as shown in, placing it in a wide contaminated area such as a river, lake or harbor, and fixing it to a pile with a rope 5 or the like. The microbial carrier 1 may be directly submerged in the contaminated area. In that case, metal powder (for example, iron content) is added to the carrier material to increase the specific gravity and make it easier to sink in water.

Next, the experimental results of the present invention will be described. FIG. 3 shows an experimental apparatus, 6 is an acrylic water tank, 7 is a carrier storage tank, 8 is a circulation pump, 9 is 40 W × 4 daylight fluorescent lamps, and 80 ml of liquid fertilizer (hyponex stock solution) in 200 liters of tap water. Were mixed and circulated at 40 ml / min, and the daylight fluorescent lamp 9 was continuously turned on day and night, and the water permeability was measured at a constant temperature of 25 ° C. The component (%) of Hyponex stock solution is as follows: total nitrogen: 5.00 (ammonia: 1.9
5. Nitrate: 0.90) Water-soluble phosphoric acid: 10.0 Water-soluble potassium: 5.0 Water-soluble manganese: 0.001 Water-soluble boron: 0.005.

The carrier used in the experiment is NO.1 coral sand: for general appreciation, 5-10 mm particles NO.2 hetimaron: made by Shinko Nylon Co., polypropylene for water purification, loofah-like (three-dimensional mesh) ( 50m ²
/ 1m ³ surface area) NO.3 Klehalon: Musashino Giken, water purification vinylidene chloride (300m ² / 1m ³ surface area) NO.4 Example A: polyethylene / polypropylene (7)
0/30) calcium carbonate 20 μm 35% was kneaded, foamed, and cut into a cylindrical shape having a diameter of 6 mm and a length of 3 mm NO.5 Example B: The calcium carbonate of Example A was changed to Shirasu sand (200 μm) NO.6 Prototype C: Block copolymer polypropylene, loofah-like (three-dimensional mesh) NO.7 Test tube type: Commercial product, polypropylene, diameter 5 m
m, length 30 mm, one end sealed, cylindrical type NO.8 Example D: Polypropylene, cylindrical type with 1 mm square of household calcium carbonate having a hollow part with open both ends, inner diameter 1 mm, outer diameter 3 mm, length 3 mm NO.9 Bovine bone: Bovine bone fired at 600 ° C to decompose organic matter and broken into 10 mm square NO.10 Blank: No carrier Permeation for 35 days using the above carrier Degree (c
m), phosphoric acid concentration (ppm), and TOC (ppm)
Was measured. The experimental results are shown in Table 1 and FIGS. 4 and 5.

[0014]

[Table 1]

From the above experimental results, coral sand, Example A,
It was found that Examples B and D adhered and propagated microorganisms and kept the water clean. All of these are those containing or adhering to calcium carbonate, but it is not preferable to use coral sand in a large amount because of the problem of environmental destruction. Therefore, Example A, Example B, and Example D are optimal. Becomes

[0016]

As is apparent from the above description, according to the present invention, a carrier material obtained by adding an inorganic filler such as calcium carbonate, calcium sulfate, shirasu sand or coral powder, and shell powder to a single substance or a mixture of polyethylene and polypropylene. It has a spherical, cylindrical or hollow cylindrical shape, or is formed by foaming these, so it has excellent durability and environment resistance, and can be used for a long period of time in rivers, lakes, harbors, etc. Sewage in a wide contaminated area can be purified by breeding microorganisms.

[Brief description of drawings]

FIG. 1 (A) and FIG. 1 (B) are perspective views showing the shape of each embodiment of a microbial carrier of the present invention, and FIG. 1 (C) is a diagram for explaining a production method according to the present invention. , Fig. 1 (D)
FIG. 3 is a cross-sectional view of the nozzle portion in FIG. 1 (C).

FIG. 2 is a perspective view showing a usage example of the present invention.

FIG. 3 is a configuration diagram of an experimental apparatus according to the present invention.

FIG. 4 is a diagram for explaining an experimental result according to the present invention.

FIG. 5 is a diagram for explaining an experimental result according to the present invention.

[Explanation of symbols]

 1 ... Microorganism carrier, 2 ... Hollow part

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Toshio Yoshida 4-1-1 Tsukiji, Chuo-ku, Tokyo (Toge Building) Tonen Kagaku Co., Ltd.

Claims (1)

[Claims] 1. A carrier material obtained by adding an inorganic filler such as calcium carbonate, calcium sulfate, shirasu sand or coral powder, and shell powder to a simple substance or a mixture of polyethylene and polypropylene, which is formed into a spherical shape, a cylindrical shape or a hollow cylindrical shape. A microbial carrier, which is characterized in that it is formed by foaming or a foamed product.