JPH0626397Y2 - Water treatment equipment for fish tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a water treatment device for a fish tank.
More specifically, the present invention relates to an oxygen-enriched microbial immobilization carrier coated on the outside of a hollow-fiber oxygen-enriched membrane with a fiber or polymer material capable of immobilizing bacterial cells, and an oxygen-enriched membrane-type carrier. TECHNICAL FIELD The present invention relates to a fish tank water treatment device that coexists with hollow fibers to purify water and increase dissolved oxygen.

<Prior Art> Various fish tanks are used for display, exhibition, appreciation, transportation, aquaculture, and the like. In the fish tank, it is necessary to provide a water treatment device to prevent water pollution.

Conventionally, as an aerobic water treatment apparatus, there are an activated sludge method, a submerged filter method, a rotating disk method, and the like, which are widely used for treating industrial wastewater and sewage. However, these methods cannot be applied to fish tanks because of problems such as large-sized equipment, difficulty in management, and treatment of generated sludge.

In recent years, with the progress of biotechnology, even in the water treatment field, attempts have been made to efficiently perform water treatment using a material on which microorganisms for water treatment are immobilized.

Methods for immobilizing oxygen and microbial cells are roughly classified into entrapping method, crosslinking method and carrier binding method, and the carrier binding method can be further classified into covalent method, ionic bond method and physical adsorption method.

The immobilized microbial cells obtained by these methods are usually in the form of gel beads or film, and are used by filling them in a reaction container such as a column.

When these immobilized microorganisms aerobically decompose pollutants in water, the contaminants and dissolved oxygen must be diffused in the bead-shaped immobilization material and supplied to the microorganisms, which slows the reaction rate. However, in some cases, the inside of the beads becomes anaerobic and the activity of microorganisms is deteriorated. Therefore, this is also not suitable as a water treatment device for a fish tank.

Therefore, the present inventors have previously proposed an oxygen-enriched microorganism-immobilized carrier in which a fiber capable of immobilizing cells is coated on the outer surface of a hollow fiber having an oxygen-enriching function (Japanese Patent Application No. 61-61). -1
54616).

This product has a high activity of microorganisms and a high treatment speed, and is suitable as a water treatment device.

<Problems to be solved by the invention> However, when this is applied as a water treatment device for a fish tank, especially when a large amount of fish is to be accommodated in the tank so that a large amount of live fish is transported, the treatment capacity is reduced. Low, increased pollution. In addition, the amount of dissolved oxygen decreases.

For this purpose, air may be fed into the tank, but a normal feeding method such as bubbling of air is not effective.

An object of the present invention is to provide a water treatment device for a fish tank that has a high activity of microorganisms, a high treatment speed, little pollution, and a reduced amount of dissolved oxygen even when a large amount of fish is accommodated. is there.

<Means for Solving Problems> Such an object is achieved by the present invention described below. That is, the present invention provides an oxygen-enriched microorganism-immobilized carrier in which the outer surface of a hollow fiber having an oxygen-enriching function is coated with a fiber or a polymeric material capable of immobilizing cells, and an oxygen-enriched membrane-type carrier. A hollow fiber is provided, and air is supplied into both the hollow fibers, and the oxygen-enriched microorganism-immobilized carrier and the oxygen-enriched membrane hollow fiber are brought into contact with water in a fish tank to purify and dissolve water. It is a fish tank water treatment device that increases oxygen.

Examples of the oxygen-enriched hollow fiber, which is one of the constituent materials of the reaction carrier used in the present invention, include polydimethylsiloxane hollow fibers.

Further, as the fiber for fixing the microbial cells, aminoacetalized polyvinyl alcohol fiber, sulfonated polyvinyl alcohol fiber, vinyl pyridine grafted polyolefin fiber, vinyl pyridine grafted polyester fiber and the like cationized or anionized synthetic fiber. Can be mentioned.

Examples of the immobilizing polymer material include polyacrylic acid, polyvinyl pyridine, and other anionic or cationic polymer electrolytes.

Aerobic microorganisms that naturally propagated as a bacterium,
Various known substances such as nitrifying bacteria can be used.

The coating includes (1) weaving the oxygen-enriched hollow fiber around the hollow fiber in the form of a braid, (2) winding the fiber around the hollow fiber, (3) the hollow fiber and the fiber (4) A polymer electrolyte monomer such as acrylic acid or vinylpyridine is graft-polymerized on the outside of the hollow fiber, (5) A polymer electrolyte aqueous solution containing the microbial cells for water treatment on the outside of the hollow fiber And then insolubilizing it with a metal salt such as calcium.

As shown in FIG. 1, the oxygen-enriched microorganism-immobilized carrier 1 is obtained by coating the oxygen-enriched hollow fiber 2 with an outer surface of a microorganism-immobilized carrier 3 of a fibrous or polymeric material.

Then, as shown in FIG. 2, the carriers 1 are bundled,
The hollow fiber 2 portion at the end of the carrier bundle 15 is embedded with a sealant 4 such as iricorn rubber, molded so that air can be sent from the inside of the hollow fiber, and a fastener 5 is attached to form a module.

As for the shape of the module 10, the carrier 3 is in the form of a string, the carrier bundle 15 as shown in FIG. 3, the woven fabric of the carrier 3 and the hollow fiber 2 as shown in FIG. 4, and the structure shown in FIG. The woven fabric of the carrier 3 as described above can be formed according to the shape of the reaction tank such as a state of being wound around a bundle of the hollow fibers 2, and a module with good contact efficiency and treatment efficiency can be prepared.

By supplying air from the inside of the oxygen-enriched hollow fiber 2 of the module 15 thus obtained, the microorganisms immobilized on the immobilization carrier 3 on the outer side have a dissolved oxygen concentration equal to or higher than that of normal air. Since oxygen is supplied at a concentration of, a highly active microflora is formed.

As shown in FIG. 6, the water treatment apparatus of the present invention is an aerobic reaction tank 6 equipped with an oxygen-enriched microorganism immobilization module 10 having both a microorganism-immobilizing function and an oxygen-enriching function with good treatment efficiency. In addition, a dissolved oxygen improving tank 7 using the module 20 of the oxygen-enriched hollow fiber 2 described above is added.

In this case, the module 20 of the oxygen-enriched hollow fiber 2 may be obtained by stacking the hollow fibers 2 and modularizing the hollow fiber bundle in accordance with the above.

By supplying air to the inside of the hollow fiber 2 of the module 20 thus obtained, oxygen is supplied to the outside water at a concentration equal to or higher than the dissolved oxygen obtained by ordinary aeration of air. As a result, the oxygen deficiency when a large amount of live fish is stored is eliminated, and the processing capacity is prevented from decreasing.

On the other hand, when air is bubbled in the fish tank 8 or a hollow fiber having no oxygen enrichment function is used, the effect of the present invention is significantly reduced.

In such a configuration, water in the fish tank 8 is circulated in the aerobic reaction tank 6 and the dissolved oxygen improving tank 7 by the circulation pump 9 to bring the water into contact with the outer surfaces of the modules 10 and 20. Also, compressed air is preferably supplied into the hollow fibers of both modules 10, 20.

In the illustrated example, the aerobic reaction tank 6 and the dissolved oxygen improving tank 7 are separate tanks, but they may be the same tank,
Alternatively, one or both may be present in the fish tank 8. However, the aerobic reaction tank 6 is preferably a tank different from the fish-raising tank 8 in terms of maintenance.

In addition to the illustrated example, the water and the circulating air can be circulated or sent independently. However, regarding the circulation of water, it is preferable that the amount of dissolved oxygen be increased in the module 20 before being introduced into the aerobic reaction tank 6.

The water treatment device of the present invention is an energy-saving device that has high treatment efficiency because concentrated oxygen is easily supplied to the immobilized microorganisms and does not require sludge separation because the cells are immobilized. is there.

<Examples> Next, the present invention will be described in more detail with reference to Examples.

Example 1 As an example of the device of the present invention, an oxygen-enriched water treatment device shown in FIG. 6 was produced.

The carrier 1 was formed by weaving a poly (dimethylmethylsiloxane) hollow fiber 2 having an inner diameter of 0.175 mm and an outer diameter of 0.35 mm around a polyvinyl alcohol-based microorganism-immobilized fiber 3 which was dimethylaminoacetalized.

An aerobic reaction tank 6 having a capacity of 2 was prepared by accommodating an oxygen-enriched microorganism immobilization module 10 in which 250 pieces of the oxygen-enriched microorganism-immobilized carrier 1 of 50 cm were bundled.

Further, the oxygen-enriched hollow fiber module 20 in which 1000 polydimethylsiloxane hollow systems 2 having an inner diameter of 0.175 mm, an outer diameter of 0.35 mm and a length of 50 cm were bundled was housed to form a dissolved oxygen improving tank 4 of 4.

These were connected to 150 fish tanks 8 and circulation pumps 9.

To the fish tank 8, put well water 140 with TOC of 0.3 ppm and 250 pieces of Ryukin with a weight of 50 g, and use modules 10 and 2.
At 0, 30 cc of compressed air of 100 kpa was flowed, and the water in the fish tank 8 was circulated by the pump 9 at a flow rate of 5 per minute through the aerobic reaction tank 6 and the dissolved oxygen improving tank 7.

As a result, the dissolved oxygen concentration was maintained at 11.2 ppm at 20 ° C, the survival rate of Ryukin after one month was 96%, and the TOC of water was
Was 0.5 ppm and the concentration of ammoniacal nitrogen was 0.03 ppm, which was good.

On the other hand, when the dissolved oxygen improving tank 7 is not used, the dissolved oxygen concentration becomes 5.2 ppm at 20 ° C., the survival rate of Ryukin after one month is 80%, TOC is 0.7 ppm, and ammonia nitrogen is 0%. It was 0.1 ppm.

Also, when using the conventional aeration and sand filtration methods,
When bubbling 2 air per minute into a fish tank with a water volume of 140, dissolved oxygen will be 4.5 ppm, TOC after one month will be 4.3 ppm, ammonia nitrogen will be as high as 0.8 ppm, and water due to bubbling will increase. Due to the agitation of Ryukin, the survival rate of Ryukin was reduced to 65%.

<Effects of the Invention> According to the present invention, it is possible to realize a fish tank water treatment device which has an extremely high pollution prevention treatment capacity and a very small decrease in the amount of dissolved oxygen even when a large amount of fish and the like are stored.

[Brief description of drawings]

FIG. 1 is a partial perspective view showing an example of an oxygen-enriched microorganism-immobilized carrier used in the present invention. Fig. 2 is a module 1 of the oxygen-enriched microorganism immobilization carrier
It is a partial perspective view which shows an example. FIG. 3, FIG. 4 and FIG. 5 are front views showing specific examples of modules of the oxygen-enriched microorganism-immobilized carrier. FIG. 6 is a schematic configuration diagram showing an example of a fish tank water treatment device of the present invention. DESCRIPTION OF SYMBOLS 1 ... Oxygen-enriching microorganism-immobilized carrier, 2 ... Hollow fiber, 3 ... Immobilized carrier, 10 ... Oxygen-enriched microorganism-immobilized carrier module, 20 ... Oxygen-enriched hollow fiber Module, 6 ... Aerobic reaction tank, 7 ... Dissolved acid system improvement tank, 8 ... Fish tank, 9 ... Circulation pump,

Claims (1)

[Scope of utility model registration request] 1. An oxygen-enriched microorganism-immobilized carrier in which the outer surface of a hollow fiber having an oxygen-enriching function is coated with a fiber or polymer material capable of immobilizing bacterial cells, and an oxygen-enriched membrane type carrier. A hollow fiber is provided, and air is supplied into both the hollow fibers, and the oxygen-enriched microorganism-immobilized carrier and the oxygen-enriched membrane hollow fiber are brought into contact with water in a fish tank to purify and dissolve water. A water treatment device for fish tanks that increases oxygen.