JP2012179001A - Method for purifying water using powder ion exchange resin inclusion adsorber as filtration layer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water purifying method that facilitates rearing of aquarium fish and hydroponic culture of plants by allowing a solution in a closed water region to flow through a bioreactor prepared by adsorbing a colloid containing a biofilm in water as a main component, by a powder ion exchange resin inclusion adsorber.SOLUTION: A filtration adsorber containing powder ion exchange resin, preferably anion powder ion exchange resin, further preferably anion-cation powder ion exchange resin is used as an organism filtration material for fish breeding water in the closed water region and a circulating culture solution in a plant factory, and an aqueous solution that suspends the colloid containing the biofilm as the main component, is brought into contact with the filtration adsorber. The powder ion exchange resin thereby adsorbs the colloid containing noxious components to not only generate transparent liquid but to reduce the blow frequency of water in use, thereby preparing the filtration absorber having an excellent organism filtrating function without causing the death of the aquarium fish and growth impediment of plants due to toxin component eluted from the biofilm which has been the greatest concern, even if the water is used as it is.

Description

The present invention is a method for effectively removing fine particles (colloid) from an aqueous solution by using a purification function inherent to a powder ion exchange resin-containing adsorbent, and preparing water safe for living organisms. Applicable to breeding water of ornamental fish and circulating culture solution for hydroponics. The colloid is a fine particle compound having a diameter of 10 microns or less made of suspended particulate matter generated by continuous use of closed water for a long period of time, and a biofilm containing harmful metabolites from microbial cells and organisms It is. By adsorbing and removing the biofilm on a filter including a powder ion exchange resin, the adsorbent is improved as a bioreactor, and removes harmful components that inhibit the growth of fish and plants, making it suitable for the growth of organisms. Maintain water quality for a long time.

For example, the bioreactor is used as a circulating water filtration device used in closed water areas such as fish breeding water or hydroponic culture culture. In particular, the bioreactor organisms are prepared by adsorbing colloids from the biofilm attached to the walls of the ornamental fish breeding tank and colloids in the circulating culture fluid of plant factories containing plant growth-inhibiting ingredients to the adsorbent containing powder ion exchange resin. By significantly improving the filtration function, water that is safe for living organisms is supplied. This enabled fish breeding and plant cultivation without exchanging circulating water over a long period of time.

As an ion exchange resin-containing adsorbent, for example, as described in Patent Document 1, 3, 4, and 5, a porous support (eg, a porous body such as a nonwoven fabric or foam stone), a fine cellulose, and powder ion exchange Non-woven fabric in which fine cellulose and powder ion exchange resin are agglomerated and reacted inside the pores of the porous support by bringing the resin into contact with water, and the powder ion exchange resin is incorporated inside the porous support pores There are felt and porous minerals. In addition, after mixing fine powder ion exchange resin and microfibrous cellulose at a certain ratio, applying a liquid composition prepared by homogenization to a nonwoven fabric filtration sheet or various porous supports, after dehydration drying There is a prepared powder ion exchange resin-containing adsorbent.

Continuing the breeding of ornamental fish accumulates sludge (residual food and feces, microbial metabolites derived from these), and gradually releases cloudy colloids containing harmful components (toxic and persistent) into the breeding water. Not only does transparency decrease, but it also kills fish. In order to purify ornamental fish breeding water, various filter media including wool mats are widely used. Its usage method is to forcibly circulate aquarium water at a constant speed, install a filter medium such as a sheet in the path, and remove the sludge, thereby reducing the contamination of breeding water and reducing the death of fish. When the breeding is continued for a long period of time, the sludge accumulates on the surface of the filtration sheet and at the same time, the cloudy colloid flows out into the aquarium water. One month after breeding, fine particles (biofilm) adhere to the aquarium wall, etc., and the aquarium fish is killed by cloudiness (harmful colloids) that flows into the water.

The sludge contains a group of effective bacteria necessary for biological filtration of breeding water. Among the intermediate metabolites by bacteria, there are compounds that inhibit the health of the organism, such as compounds that generate ions in the nascent stage and toxic substances. It can be estimated that it exists. In order to decompose these harmful microbial metabolites, an attempt is made to promote, for example, the nitrogen cycle (decomposition / detoxification of harmful nitrogen components) by introducing effective bacteria (nitrifying bacteria, etc.) that have been artificially cultured and grown in advance. However, the actual situation is that it is expensive and the practical effect is extremely low. The usual breeding method waits for the natural occurrence of effective microbial groups (biofilm) to avoid extreme contamination of breeding water. However, it takes days to produce a biofilm with practical effects. It is difficult to remove harmful components (toxins such as ammonia and nitrous acid) generated in the breeding water at the beginning of the breeding period (within 1 month), which is not in place, and the fish mortality rate during this period is high. This makes fish breeding methods difficult. Regardless of the method, sludge is produced by continuing the breeding of fish, and the sludge adheres to the aquarium wall surface and filter material surface. Yes. In the usual ornamental fish breeding method, the aquarium is cleaned once or twice a month, and about half of the dirty aquarium water is replaced with new water to ensure the clarity of the breeding water and Avoid accumulation.

For circulating cultures used in hydroponic cultivation, let's make active use of effective bacteria in the culture using a bioreactor, a technology that removes plant growth-inhibiting substances generated during hydroponic cultivation with a filter adsorbent. In the current technology, the circulating culture solution in which growth-inhibiting components accumulate (pH decrease) and plant growth has been reduced is periodically discarded. It is desired to establish technology to reduce plant weight and grow plants.

JP 2000-312881 A JP2003-245687 JP 2004-203988 A JP 2005-102673 A Japanese Patent Application No. 2010-151942

An object of the present invention is a technique for facilitating the breeding and cultivation of familiar organisms represented by ornamental fish and vegetables, for example, greatly simplifying the breeding work and hydroponics of esoteric ornamental fish that require specialized knowledge This is a water purification method that prevents contamination of circulating water by colloids derived from fish breeding and plant hydroponics, and enables breeding of ornamental fish and hydroponics over a long period of time.

As described above (0004), when breeding ornamental fish in an aquarium, avoid sludge accumulation inside the aquarium, for example, the surface of the filtration sheet or the bottom of the aquarium, and the loss of aesthetics due to the attachment of particulate solids to the aquarium wall. I can't. This dirt is a biofilm as an aggregate composed of sludge derived from residual food and feces in an aquarium, and composed of aggregates of microorganisms and secretions of the microorganisms around solids, If it is left as it is, it will cause fish to die by generating cloudy colloids containing harmful components and metabolites (compounds that generate harmful ions during the nascent stage) from the sediment.

On the other hand, in plant hydroponics, ozone sterilization and ultraviolet sterilization are carried out on the culture solution used for circulation, but it is impossible to prevent the generation of biofilm (colloid) in the circulation solution.
These biofilms are composed of a plurality of microorganisms rather than a single microbial population. In such a biofilm, anaerobic microorganisms were detected in addition to the aerobic microorganisms.

The present invention is to use the biofilm described above. For example, in the case of breeding ornamental fish, sludge that easily settles in water and sludge accumulated on the surface of the sheet (biofilm rich in dead bodies of microorganisms and intermediate metabolites of organic matter). Is preferably discharged out of the system as much as possible as excess sludge regularly (around once a month). The solid matter (biofilm) adhering to the inner wall of the aquarium serves as a cleaning work and rubs the wall regularly (about once a month) to produce a suspension. The suspension is a microparticle (colloid) rich in active microorganisms including effective bacteria, and reacts with a compound (metal component or nonmetal component) dissolved in water to form a water-insoluble cloudiness. Produce material. Although this cloudy substance may contain harmful components such as persistent organic pollutants and arsenic, the main component is a colloid composed of a biofilm containing a microbial metabolite such as a hardly decomposable inorganic compound. It was confirmed by microscopic examination that the colloid is a compound containing fine particles having a diameter of 10 microns or less that inhibits fish health. These fine particles are difficult to remove even if they flow through a normal filter for ornamental fish, and it is difficult to restore the transparency of water. However, powder ion exchange resins (especially powder anion exchange resins, preferably Yin Yang powder) The colloid was completely adsorbed and no harmful ion component was leaked by passing it through a filtration adsorbent containing an ion exchange resin). This not only completely restores the transparency of the water and keeps its aesthetic appearance, but also eliminates the generation of harmful ions that are fatal to fish and renders the breeding water harmless. In other words, the powder ion exchange resin occludes colloids with a diameter of 10 microns or less in the breeding water, so that it does not induce fish death due to the most concerned harmful ion component, but rather the water purification action of effective bacteria by biofilm ( The increase in biological filtration has made it possible to keep fish in a healthy state for a long time without frequently changing aquarium water. (Examples 1, 2, and 3)

In hydroponic cultivation of plants, a biofilm is positively adsorbed by positively adsorbing biofilm to the adsorbent by bringing the filtration layer comprising the adsorbent containing the powder ion exchange resin of the present invention into contact with the circulating culture solution. By increasing it, the contamination of the culture solution is prevented. (Example 6)

The feature of the ornamental fish breeding method in the present invention is that the dirt adhering to the wall surface is periodically peeled and cleaned (once every 1 to 2 months) to float the colloidal liquid in water, and the powder ion exchange resin inclusion adsorption To adsorb (occlude) the body. The colloidal component is a particulate solid having a diameter of 10 microns or less including a group of microorganisms rich in aerobic microorganisms (eg, nitrifying bacteria) and anaerobic microorganisms (eg, denitrifying bacteria). The solid matter containing the active microorganism group most suitable for the environment is intermittently brought into the filtration adsorbent by peeling off dirt adhering to the water tank wall and bringing it into flow-contact with the filter adsorbent containing powder ion exchange resin. It has been found that the biofiltration function is remarkably improved by the continuous supply. The filtration adsorbent contains a large amount of effective bacteria cultivated during breeding, and is a breeding method based on the conventional method in which purely cultured nitrifying bacteria and the like are added to breeding water to enhance the biological filtration effect. It was found that the biological filtration effect including the nitrogen cycle was rapidly developed (Examples 4 and 5).

By applying the present invention to the breeding of ornamental fish, the powder ion exchange resin efficiently removes harmful components derived from sludge accumulated in the ornamental fish breeding water. 2. Cleaning operation of the aquarium fish breeding tank became easy. 3. The frequency of aquarium water exchange was significantly reduced. 4. Fish mortality decreased. 5. The transparency of the breeding water has been remarkably improved. These effects have made it easier to breed ornamental fish. In hydroponics, not only the amount of circulating culture solution blow, but also the content of harmful components in the blow waste solution has decreased.

The present invention will be described in detail by the following examples, but is not limited by these examples.
Example 1

(experimental method)
About 50 ml of sludge accumulated on the filter surface of the upper filtration device of the aquarium one month after the start of goldfish breeding is poured into 1,000 ml of pure water and homogenized in a mixer. This liquid is allowed to stand for about 1 hour, and then the precipitated solid is fractionated by a decantation method to prepare a tan colloid suspension. This colloidal suspension is composed of vigorous microorganisms (aerobic and aquatic bacteria) acclimatized in the goldfish breeding environment, and suspended particulate matter (residual organic pollutants: toxic and persistent) below 10 microns. It is a cloudy substance that is thought to contain harmful components such as a compound having a biological property or bioaccumulative property, and cannot be removed by a normal filter sheet for ornamental fish. If the sludge is left for a long period of time, the colloid of fine particles leaks in the breeding water, causing the breeding water to become cloudy and impair the beauty, and also induces the death of fish. On the other hand, it was found that the precipitate solids are relatively large agglomerates and can be easily separated by a normal filter such as a sponge, and can be easily separated and removed as excess sludge.

Three transparent glass cylinders (30 cm in height) charged with 400 ml of the colloid suspension are prepared. In the first cylinder (A), a non-woven sheet (5 × 5 × 2 cm) containing a powder ion exchange resin is put and immersed in the colloid suspension. In the next group (B), a non-woven sheet that does not contain powder ion exchange resin is immersed, and in the third group (C), a cylinder containing only the same amount of the colloid suspension is prepared. The change in appearance of each cylinder, in particular the transparency of the aqueous solution, and the difference in the state of adhesion of the particulate solid matter to the inner wall of the glass cylinder were observed.

＊白濁コロイドは、粉末イオン交換樹脂包含繊維で容易に吸着されること、ガラス壁面に付着して白濁させることが判った。 After standing overnight, both glass cylinders showed significant changes in appearance.
The test results are shown in Table 1.

* It was found that the cloudy colloid is easily adsorbed by the powder ion-exchange resin-containing fiber and becomes clouded by adhering to the glass wall surface.

(Example 2)
Digital pack test arsenic [DPM-As] (Kyoritsu Institute of Physical and Chemical Research) to select arsenic as a harmful component that is expected to elute from sludge retained in breeding water for a long period of time and confirm the action effect of powder ion exchange resin ), The arsenic ion fate was measured by the same method as in Example 1 using an aqueous solution containing 0.3 ppm aqueous solution of arsenic acid and arsenite ions as the test solution. In the test section in which a sheet not containing resin was properly immersed, the arsenic ion concentration did not change even after one night, but in the test section (A) in which a sheet containing powder ion exchange resin was immersed, after one night The arsenic concentration in the aqueous solution was below the detection limit, and it was confirmed that arsenic ions were adsorbed by the powder ion exchange resin.

(Example 3)
In order to investigate the action effect of powder ion exchange resin on harmful components (developmental ions) that are expected to arise from metabolites of microorganisms accumulated in ornamental fish breeding water, free chlorine ions with a bactericidal ability against microorganisms of 1 ppm or more The tap water of Okazaki city was selected as the test solution, and the following experiment was conducted.

(experimental method)
1 g of powder anion exchange resin (water content about 50%, average particle size 15 microns, Diaion PA316) and powder cation exchange resin (water content about 50%, average particle size 17 microns, Diaion PK216) 0.5g A glass column was filled with 30 ml of powder ion exchange resin fibers included by the method, and the tap water (Okazaki City water) was allowed to flow downward at normal temperature and 750 ml / h, and the fluctuation of free chlorine ions in the treated water was examined. . The analysis was performed by a simple method using an ortho-toluidine method reagent.
Properties of Okazaki tap water: electric conductivity 0.15 ms / cm, pH 7.5
Ortho-toluidine reaction: positive, free chlorine content; 1 ppm or more

The test results are shown in Table 2.

It has been clarified that the powder ion exchange resin works with free chlorine which is harmful to the growth of fish to make harmless water which is easy for microorganisms and fish to grow. This effect is the effect of the powder ion exchange resin exchange group acting on the free chlorine ions to extinguish the nascent ions. The mechanism of this action is unknown, but the effect of the powder ion exchange resin was completely unexpected. It is.

By using the adsorbent containing powder ion exchange resin as a filter medium for aquarium fish breeding water, it will contribute to the growth of effective bacteria by eliminating the health hindrance caused by free ions that may be generated from sludge by continuing the breeding. In order to enhance the biofiltration effect as a “bioreactor”. It was confirmed that this is one of the important factors that enhance the effects of the present invention.

Example 4
Experimental method 100 g of chlorine-type strongly basic powder anion exchange resin (water content about 50%, average particle size 15 microns) prepared by mechanical pulverization of used granular ion exchange resin and strongly acidic cation exchange resin (water content 50%, Powder ion exchange with an average particle size of 17 microns and 100 g of microfibrous compound (90% moisture, equal mixture of PC110S and FD1000, Daicel Kogyo Co., Ltd.) in 10,000 ml of water and homogenized for 2 minutes A liquid composition containing a resin as a main component was prepared. A non-woven filter sheet for aquarium fish breeding (commercially available product) was immersed in the liquid composition and then dehydrated to prepare a powdered ion exchange resin-containing filter adsorbent sheet.

The filter medium of the present invention was prepared by contacting and mixing the biofilm-containing solution produced in the aquarium fish tank being bred with the powder ion exchange resin-containing filtration adsorbent sheet (length 35 cm × width 12 cm × width 1 cm). Prepare a 60 cm water tank (internal volume: 100 L) (A) in which the filtering material is set in the upper filtering device (setting a coarse sponge sheet on top of the filtering material makes it easy to collect excess sludge. , Make cleaning work easier). As a control, two aquarium fish breeding aquariums (B and C) equipped with an upper filtration device set with the same non-woven filter sheet for ornamental fish as in (A) not containing the usual powder ion exchange resin are prepared. The tanks (A), (B), and (C) are installed at indoor windows that are exposed to sunlight for about 1 hour. The same number of 100 guppy is released into each tank, and the same amount (spoon) Breeding test was started while administering 1 cup of food.

One month after the start of the breeding test, solid matter adhered to the aquarium wall, and there was a marked difference in the appearance of dirt. In the water tank (A) equipped with a powder ion exchange resin-containing filtration adsorbent sheet, the wall surface exposed to sunlight was slightly contaminated by the generation of algae, but there was no significant wall contamination and foreign matter adhering to the wall corner. Was easily peeled off by lightly rubbing with a brush. At this time, there was almost no sedimentation of sludge in the rough sponge sheet. (This indicates that biofiltration is successful and that there are fewer intermediate metabolites from the microorganism). As an index indicating the contamination of the aquarium, the transparency of the aquarium water was measured immediately after the stain on the wall surface of the aquarium was peeled and the biofilm was suspended. Absorbance meter (manufactured by Hitachi;) Transmittance: T720 cm, 1 cm, 86.5%.

In the water tanks (B and C) using the filter sheet not containing the powder ion exchange resin, the amount of sludge accumulated in the coarse sponge sheet was large, which was significantly different from (A). The wall surface was particularly dirty, and the wall surface exposed to sunlight turned blue with algae, and the soil was so dirty that the fish in the aquarium could not be confirmed. The dirt adhered firmly to the wall surface, and it was particularly difficult to completely remove the foreign matter adhering to the wall surface corner. The water in the aquarium in which the exfoliated material was suspended was extremely dark brown, and the transparency at this time was remarkably lowered, and the transmittance was T720 nm, 1 cm: 65.3%, which was significantly different from the aquarium (A).

The aquarium water containing fine colloids from which the foreign matter on the aquarium wall of the aquarium (A) has been peeled off will continue to be filtered as it is. The appearance and aesthetics, especially water transparency, were excellent, and only one fish died during the first month after breeding.

In the tanks (B) and (C), the filter sheet surface was severely soiled, and more sludge accumulated on the surface of the sheet than in the tank (A), resulting in a large number of fish deaths. After discharging the excess sludge accumulated on the filtration sheet surfaces of the tank (B) and (C), change the breeding method for the tank (B) and the tank (C), and discharge the excess sludge directly outside the system. A method (B) according to the present invention for rearing ornamental fish without exchanging the breeding water, and cleaning the aquarium and exchanging half the amount of dirty breeding water and fresh water, adding commercially available nitrifying bacteria, A comparative test was carried out by changing the breeding method to a normal method that improved the transparency of the animal and emphasized the appearance. About water tank (A), it implemented continuously as it is.

For tank (B), the deposits on the tank wall were peeled into the tank every two weeks, and the breeding water was not replaced in the same way as the tank (A), but the excess sludge accumulated on the filter sheet was removed. After discharging out of the system, the aquarium fish breeding test was continued while biologically filtering the aquarium water without changing the aquarium water. As for the water tank (C), the water tank cleaning work that has been generally performed in the past is carried out, the sheet-like sludge and the sludge settled on the bottom of the water tank are discharged out of the system as much as possible, and the water tank containing the sludge stained in blackish brown About half of the water was discharged, and fresh water (groundwater) was added to fill the aquarium water to restore the transparency of the breeding water, and then the ornamental fish breeding test was continued.

As described above, after the start of breeding filtration, the breeding water in tank (A) became transparent after 1 hour even though breeding water was not exchanged, and the appearance was completely restored. For tanks (B) and (C), the transparency does not recover even after 5 hours from the start of the filtration test, and the transparency of the tanks (A), (B), and (C) after 24 hours is The permeability (T720nm, 1cm) of the water tank (A) using the powder ion exchange resin-containing filtration adsorbent is 100%, the water tank (B) is 96%, and the water tank (C) is 98%. The difference was clear and the aesthetics of the tank (A) were overwhelmingly excellent.

In the tanks (A), (B), and (C), the aquarium fish breeding test was continued according to each breeding method described above while continuing to clean the tank wall and remove the sludge accumulated on the filter sheet. The test results are shown below.
* Aquarium water analysis was measured when 1 day had passed since wall cleaning.

The test results are shown in Table 3.

The water tank (A) was excellent in transparency, and no harmful nitrogen components (NH4-N, NO2-N) were detected. NO4-N gradually increased and biofiltration was found to be smooth. The number of fish deaths was small, and after 2 months, new Guppy children were born, and after 3 months the population doubled. In the tanks (B) and (C), several guppy children were seen after 3 months.

The aquarium (B) had difficulties in water transparency, but there were fewer harmful nitrogen components (NH4-N, NO2-N) than the aquarium (C), but the number of fish deaths compared to the aquarium (A) It is estimated that the colloids present in the water hindered fish health.

Although the water tank (C) according to the normal breeding method was water-changing frequently, the transparency of the water was better than the water tank (B), but worse than the water tank (A). Water exchange, which was considered the most reasonable method, was found to increase the number of fish deaths and reduce biofiltration.

As a breeding method, in the water tank (A) system, that is, a water tank using a powder ion exchange resin-containing adsorbent, the excess sludge accumulated in the filter sheet is discharged out of the system, and the fine particles (biofilm) attached to the water tank wall surface By adopting the breeding system of the present invention characterized by periodically peeling and promoting biological filtration, maintaining the beauty of the breeding aquarium, reducing the number of fish deaths, and making the method of breeding ornamental fish significantly easier I understood.

(Example 5)
Polyester prepared by cutting the sheet outside the form (industrial waste) produced as a by-product during the production of the nonwoven fabric sheet for automobiles into the liquid composition mainly composed of the used powder ion exchange resin disclosed in Example 3 100 g of porous felt lump (diameter, about 10 mm) made of non-woven fiber is added, gently mixed, powder ion exchange resin is applied to the felt, dehydrated, and then blown and dried at 80 ° C. for 2 hours. A filtration adsorbent was prepared by firmly bonding the functional powder ion exchange resin to the felt fiber surface layer. This filtration adsorbent contains a large amount of powder ion exchange resin and does not peel off. The filter adsorbent prepared in this way is unique to the excellent powder ion exchange resin that was not found in existing filter materials for ornamental fish. This is an inexpensive non-woven filter medium (A1) having a purification function.

A long-term breeding test of ornamental fish was started on the premise that the aquarium water was not replaced by the method described below.
At the center bottom of a square water tank (with an internal volume of about 30 L), an air lift type filtration device is set, and a shell as a pH function adjusting agent is introduced. The filtration device (manufactured by Klion Co., Ltd., Powerhouse filter cylinder) is filled with 20 g of the filter material (A1) containing the powder ion exchange resin, and air is forced through the air pump to force water in the tank Circulate. A sponge-like filter is installed at the filter tube inlet, and large foreign substances and excess sludge are separated on the filter surface. Fill this aquarium with 25L of breeding water, place it at the window where the sunlight hits for about 1 hour a day, plant 3 goldfishes with a length of about 5cm and aquatic plants, and start a breeding test focusing on aesthetics. The amount of food to be administered should be taken within 5 minutes and, as a rule, given once in the morning and evening.

In ordinary aquarium fish breeding methods that do not use powder ion-exchange resin-containing filtration adsorbents, it is essential to replace the breeding water contaminated by continued breeding with new water, especially in terms of appearance. Transparency of aquarium water is important in the world where you enjoy the aquarium you value. For that purpose, it is a necessary condition that there are few stain | pollution | contamination of a water tank wall surface, the peeling of the deposit | attachment of a water tank wall surface is easy, and water tank water does not color with yellowing pigment | dye etc.

In the ornamental fish breeding method of the present invention, the adhering substance is removed at the stage (about once a month) when the aquarium wall is cloudy, that is, the adhesion of foreign matter (biofilm) on the wall surface detracts from the beauty as the wall surface dirt. After peeling and suspending in the aquarium water, the breeding filtration test is continued as it is, so that the suspension (colloid) is occluded by the powder ion exchange resin filtration adsorbent, and the transparency of water is completely recovered. Large foreign matter (excess sludge) accumulated in the sponge filter set at the inlet of the filter tube is easily discarded by removing the sponge from the system and washing it.

Currently, a long-term breeding test of more than one year has been continued, but the transparency of the aquarium water was maintained, the aquarium wall was not soiled, and the aesthetics could be maintained without long-term water exchange. There is a difference in the generation of algae corresponding to the change of the season, but it can be easily peeled off by simply rubbing the wall with a brush. This aquarium water that is cloudy with exfoliated solids can be used not only for turbid components but also for the yellowing components produced during breeding by using a powder ion-exchange resin-containing filtration adsorbent by continuing circulating filtration with an air lift system for 1 hour. It was also found to adsorb.

The effect of the present invention is that a filter using a powder ion exchange resin-containing filter adsorbent is used, and that a biofilm adhering to the wall surface of the aquarium is intermittently suspended in the breeding water (preferably an eye such as a sponge). Using a coarse filter, the excess sludge that accumulates on the sheet surface is discarded outside the system, and the most troublesome water change work is not changed for 3 months or more, preferably 6 months or more. This is an ornamental fish breeding method that makes it easy for children and the elderly to enjoy the aquarium world, which has been considered difficult for non-experts.

The powder ion exchange resin used in this experiment was prepared as a powder ion exchange resin-containing adsorbent from a porous granular material prepared by cutting a used granular ion exchange resin and felt outside the mold of an automobile seat. All of these substances are produced in large quantities as industrial waste, and powder ion exchange resins can be easily regenerated, and used powder ion exchange resin-containing adsorbents can be easily incinerated. Therefore, the present invention is applicable to groundwater and industrial wastewater containing harmful components (such as arsenic) as well as ornamental fish and fish culture water. By recycling these industrial wastes, The significance of the implementation on an industrial scale is significant.

(Example 6)
The following test was carried out using the culture solution A (contaminated culture solution just before the blow) in use at the container-type small hydroponic cultivation facility where lettuce is grown.
Experimental method 1,
A commercially available airlift filtration device (Cryon Co., Ltd. power house volume 400 ml) is filled with the same powder ion exchange resin filtration adsorbent as used in Example 5 (Example 5, A1), and the air lift A type filtration device is installed in the water tank B, and about 10 liters of the culture liquid A is introduced. Using the air pump, the culture solution A is internally circulated under a curious condition to prepare a purification solution. Collect the clarified solution every day and return it to the stock solution tank (containing 100 liters of culture solution A). 10 liters of the culture solution mixed in the stock solution tank is returned to the water tank B, and air is introduced to continuously circulate the culture solution for purification. In this way, about 100 liters of the culture solution A was sequentially transferred to the water tank B, and a purification test was performed in an aerobic atmosphere to examine changes in properties of the treatment solution.
After 15 days, 400 ml of the packed filter medium was transferred from the above-mentioned power house airlift circulator (aerobic) manufactured by Klion Co., Ltd. to a test column with a diameter of 3 cm and a height of 60 cm). h. The system was changed to a method of passing at 37 ° C. (anaerobic atmosphere), and the culture solution stored in the stock solution tank (100 liters) was directly circulated using a pump. The properties of the circulating treatment liquid at this time were examined.

The test results are shown in Table 4.
Properties of the stock solution: Electrical conductivity (EC): 2.5ms / cm, pH: 5.7, T720nm, 1cm (transmittance): 86%

Consideration 1: By applying a powder ion exchange resin-containing adsorbent to the plant factory circulating culture solution (immediately before blowing), the colloid in the circulating fluid can be adsorbed efficiently in both the air lift system and the column system. It was found that the transmittance increased significantly from 86% to over 95%.
2. An increase in the pH of the culture solution was observed by the flow treatment using an air lift system with aeration (aerobic conditions). This indicates that the metabolic components (acidic components) secreted by the plant have been removed, and this action has a certain effect even with the scientific ion exchange action of the powder ion exchange resin, but at the initial stage. It is limited to. As is clear from the results of this test, an increase in pH over 10 days indicates that the adsorbent containing a powder ion exchange resin adsorbed the biofilm and enhanced the biofiltration function. .
3. A decrease in electrical conductivity with increasing pH was gradually observed from about 10 days after the start of flow. From this stage, microorganism groups (colloids mainly composed of biofilm) in the plant culture solution It seems that the bioreactor (biological filtration) function was developed by adsorption.
After the passage of 4, 15 days, the flow method was changed from the air lift method to the column method, and the function of the bioreactor of the adsorbent containing powder ion exchange resin due to the difference in the flow method was investigated.
5. It turned out that the function as a bioreactor changes remarkably by changing the flow method from the air lift method to the column method.
6. When the active ingredient in the plant culture solution is left and the biological filtration function of the plant metabolic component (pH lowering component) is expected, the culture solution is purified under aerobic conditions such as an air lift system, and the waste solution It was found that it was necessary to purify the culture solution under anaerobic conditions for the eutrophication component (reduction of harmful nitrogen component: NO3-N decrease).
7. As is clear from the above test results, it has been found that the industrial value of applying a culture solution treatment apparatus having a filtration adsorbent containing a powder ion exchange resin to a hydroponics facility of a plant factory is great. It was.

(Example 7)
Through this experiment, it was found that the purification effect of the culture solution by the powdered ion-exchange resin-containing adsorbent filter body is large due to the biofilm filtration. Therefore, the colloid mainly composed of biofilm produced in the aquarium fish breeding tank The same experiment as in Example 5 was performed using the powder ion exchange resin adsorbent (Example 5) that adsorbs the.

(Test results)
The biological filtration effect was remarkable, the purification effect of the culture broth was remarkable, and the test result almost the same as the effect of the above example was recognized only by passing the filtration layer once.
In this experiment, a powder ion exchange resin adsorbent adsorbing a colloid composed mainly of biofilm generated during the breeding of ornamental fish was used as a filtration layer. By adding effective bacteria such as Bacillus subtilis and EM fungus, Increasing the biofilm effect can be easily estimated.

Claims (6)

A method for purifying water, comprising purifying an aqueous solution in a closed system using a bioreactor prepared by adsorbing a particulate ion colloid mainly composed of biofilm to an adsorbent containing powder ion exchange resin. The method for purifying water according to claim 1, wherein the adsorbent containing powder ion-exchange resin is an adsorbent in which a powdered ion-exchange resin is contained in a porous felt lump prepared by cutting a non-woven fabric sheet outside the mold. The method for purifying water according to claim 1 or 2, wherein the colloid is a colloid attached to a wall surface of an aquarium fish tank. The method for purifying water according to claim 1 or 2, wherein the aqueous solution in the closed water body is a hydroponic culture medium. The method for purifying water according to claim 4, wherein the culture solution is passed under aerobic conditions. The method for purifying water according to claim 4, wherein the culture solution blow drainage is passed under anaerobic conditions to reduce nitrate nitrogen.