JP3445210B2 - Water treatment carrier - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a water treatment carrier used in various water treatments using microorganisms, a method for producing the water treatment carrier, and a water treatment apparatus using the water treatment carrier. Regarding

[0002]

2. Description of the Related Art Conventionally, in water treatment such as wastewater treatment using microorganisms, for example, in a water treatment tank such as an anaerobic tank or an aerobic tank, a water treatment carrier made of a synthetic resin molding as a fluidized bed. Has been thrown in. The carrier for water treatment is for treating water by adhering microorganisms in the tank and growing the adhered microorganisms.
As such a water treatment carrier, for example, a molded product of polyethylene resin or polypropylene resin is used.

[0003]

However, since the specific gravity of such a polyethylene resin or polypropylene resin is 1.0 or less, if a molded product as it is is used in a fluidized bed, it will float from the water. For example, a filler such as calcium carbonate or barium sulfate is blended to adjust the specific gravity to improve the fluidity.

However, polyethylene resin and polypropylene resin are hydrophobic in the first place and have a low affinity with microorganisms, and when a filler such as calcium carbonate or barium sulfate is added, they are easily abraded and damaged by mechanical stirring. It causes the problem of becoming.

On the other hand, a molded product of a hydrophilic resin such as cellulose acetate may be used for a fluidized bed, but it is decomposed by microorganisms due to long-term use and its shape is changed, so that it cannot be used stably. That causes a problem.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a carrier for water treatment, which has high affinity with microorganisms, good fluidity, and excellent durability. Another object of the present invention is to provide a method for producing the water treatment carrier, and a water treatment device in which the water treatment carrier is used.

[0007]

In order to achieve the above object, the present invention comprises: (1) The hydrophilic unit is contained in a proportion of 10 to 95% by weight.
Hydrophilic thermoplastic polyurethane resin and hydrophobic
With a thermoplastic resin of 7/3 to 9/1 in a weight ratio.
A carrier for water treatment, characterized by being blended and molded by a melt molding method , ( 2 ) the hydrophobic thermoplastic resin is a polyethylene resin,
Polypropylene resins, polyvinyl acetate resins, polyacetal resins, acrylonitrile - butadiene - styrene resin, acrylonitrile - characterized in that at least one selected from the group consisting of a styrene resin, wherein
For water treatment according to (1) a carrier, characterized in that it is (3) porous, the
(1) or the carrier for water treatment according to (2) , ( 4 ) substrate adsorbing substance, and / or containing a substance that improves enzyme activity or promotes growth, characterized by the above (1) ) To (3) , the water treatment carrier according to any one of (3) to ( 5 ), wherein the hydrophilic unit is contained in a proportion of 10 to 95% by weight.
Rare hydrophilic thermoplastic polyurethane resin and hydrophobic
Of thermoplastic resin with a weight ratio of 7/3 to 9/1
In blended, characterized by molding by melt molding method, a method of producing water treatment carrier, (6) a hydrophilic unit containing in a proportion of 10 to 95 wt%
Rare hydrophilic thermoplastic polyurethane resins and hydrophobic
Of the thermoplastic resin of 7/3 to 9/1 in weight ratio.
A water treatment carrier characterized in that a water treatment carrier which is combined and molded by a melt molding method is used.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The carrier for water treatment of the present invention is used for water treatment using microorganisms and has a hydrophilic unit of 10
~ 95 wt% hydrophilic thermoplastic resin
Weight ratio of polyurethane resin and hydrophobic thermoplastic resin
Blended in a ratio of 7/3 to 9/1 by the melt molding method.
Is molded .

By blending a hydrophilic resin, the initial water absorption can be improved, the affinity of microorganisms can be increased, and the adhesion and growth of microorganisms can be improved.
Efficient water treatment can be performed. In addition, by incorporating a hydrophobic resin, it is possible to make it less susceptible to decomposition by microorganisms, maintain its strength, and ensure stable use over a long period of time. The specific gravity of the resulting water treatment carrier can also be adjusted by blending a hydrophilic resin and a hydrophobic resin. For example, when the specific gravity of the hydrophilic resin is greater than 1.0, The specific gravity of the hydrophobic resin is preferably smaller than 1.0, and more specifically, for example,
When the specific gravity of the hydrophilic resin is in the range of 1.01 to 1.20, the specific gravity of the hydrophobic resin is preferably 0.85 to 1.15. In the present invention, the hydrophilic thermoplastic resin means a resin that swells with water.

Further, such hydrophilic resin and hydrophobic resin are thermoplastic resins . By making the hydrophilic resin and the hydrophobic resin both thermoplastic resins, they can be blended and uniformly melt-molded, and by the melt-molding, they are molded into any shape according to the purpose and application. be able to.

More specifically, a hydrophilic thermoplastic resin
For, a polyurethane resin is used . Examples of the hydrophobic thermoplastic resin include polyethylene resin, polypropylene resin, polyvinyl acetate resin, polyacetal resin, acrylonitrile-butadiene-styrene (AB
S) resin, acrylonitrile-styrene (AS) resin,
Examples thereof include polyvinyl chloride resin, polycarbonate resin, polyethylene-polypropylene copolymer, polyvinylidene chloride resin and the like. You may use these 2 or more types together.

The hydrophilic polyurethane resin usually contains a hydrophilic unit such as polyoxyethylene. In the hydrophilic polyurethane resin, a hydrophilic unit such as polyoxyethylene, polyoxypropylene and And / or a hydrophobic unit such as polyoxybutylene. By including a hydrophilic unit and a hydrophobic unit in the hydrophilic polyurethane resin, the hydrophilic unit improves the initial water absorption, enhances the affinity of microorganisms, and improves the attachment and growth of microorganisms. On the other hand, the hydrophobic unit makes it difficult for the microorganisms to decompose even after long-term use, maintains the strength, and ensures stable use. When the hydrophilic unit and the hydrophobic unit are contained, the ratio of the hydrophilic unit is preferably 10 to 95% by weight, and more preferably 20 to 90% by weight based on the total amount of the hydrophilic unit and the hydrophobic unit.

The hydrophilic thermoplastic polyurethane resin and the hydrophobic thermoplastic resin are mixed in a weight ratio of 7 /.
3 to 9/1 , and the specific gravity of the obtained mixture is 0.93.
To 1.20, preferably 0.97 to 1.05, and more preferably 0.98 to 1.03. Specific gravity,
In this way, by bringing the specific gravity of water close to 1.0, it is possible to improve the fluidity when the water treatment carrier of the present invention is used as a fluidized bed.

The water treatment carrier of the present invention preferably contains a substrate adsorbing substance and / or a substance which improves enzyme activity or promotes growth. By containing these, microorganisms can be easily attached to and proliferated on the surface of the water treatment carrier, and more efficient water treatment can be performed.

Examples of such a substrate adsorbing material include natural ceramics containing natural stone, artificial ceramics, activated carbon, carbon black, and silicate compounds. These may be used alone, or
You may use together 2 or more types. Preferred are activated carbon and carbon black. The ratio of the substrate adsorbing substance to be added is, for example, 0.1 to 40 parts by weight, preferably 0.5 to 30 parts by weight, based on 100 parts by weight of the thermoplastic resin.

Examples of the substance that improves the enzyme activity or promotes growth are metals such as copper and zinc, and salts, oxides, sulfides, and water of such metals, which are insoluble or sparingly soluble in water. Examples thereof include oxides and the like, and those in which such a metal or metal compound contains an inorganic substance and / or an organic substance. These may be used alone or in combination of two or more.
Preferred are copper oxide, copper sulfide, and copper hydroxide.
The proportion of the substance that improves the enzyme activity or promotes the growth is, for example, 0.005 to 5 parts by weight, preferably 0.0 to 100 parts by weight of the thermoplastic resin.
It is 1 to 3 parts by weight.

The substrate adsorbing substance and the substance that improves the enzyme activity or promotes growth may be prepared as a masterbatch, for example.

The water treatment carrier of the present invention contains, for example , the above-mentioned thermoplastic resin and, if necessary, a substrate-adsorbing substance and / or a substance that improves enzyme activity or promotes growth. For example, it can be obtained by a known melt molding method such as extrusion molding using a known melt molding machine such as an extrusion molding machine. In extrusion molding,
For example, so-called co-extrusion molding may be performed in which two or more types of thermoplastic resins are simultaneously drawn from two or more types of partitioned dies and the shape can be freely formed. As such molding conditions, for example, in the case of extrusion molding, when the screw diameter of single screw extrusion is 50 mmφ, the discharge rate is 5 to 35 kg / hr, and the screw rotation speed is 10
˜80 min ⁻¹ , and the die temperature is 130 to 230 ° C. When used as a fluidized bed, for example, it may be formed into any shape such as granular, spherical, columnar, cylindrical, bale-shaped, rice granular, or rugby ball-shaped. Also, the size is appropriately selected, for example, 1 to 5
It is preferably about 0 mm.

The water treatment carrier of the present invention thus obtained contains the hydrophilic unit in an amount of 10 to 95% by weight.
Rare hydrophilic thermoplastic polyurethane resin and hydrophobic
Of thermoplastic resin with a weight ratio of 7/3 to 9/1
Blended in and molded by the melt molding method ,
It has good affinity with microorganisms, and improves the fluidity of the water treatment carrier, and even after long-term use,
It is hardly decomposed by microorganisms and can be used stably.

Further, in the water treatment carrier of the present invention, it is preferable to add a foaming agent at the time of its production to make the obtained molded product porous. More specifically, for example ,
The above-mentioned thermoplastic resin is melt-molded with a foaming agent,
The obtained molded product is made porous. If the water treatment carrier is made porous, the specific gravity of the water treatment carrier can be adjusted by appropriately adjusting the porosity (also called porosity or porosity) of the water treatment carrier by adjusting the amount of the foaming agent used. It can be adjusted by the agent, and as a result, for example, when used as a fluidized bed, the fluidity can be further improved. Further, by making the surface porous, since irregular pores are usually formed on the surface thereof, it is possible to facilitate attachment of microorganisms to the surface, and further efficient water treatment is possible. Can be done. When used as such a fluidized bed, its porosity is set to 5 in order to bring its specific gravity close to that of water (1.0).
˜95%, more preferably 10 to 90%. The porosity may be continuous cells or closed cells. For example, in the case of closed cells, the size of the cells is 1 to 3000 μm, and further 10 to 10 μm.
It is preferably 2000 μm.

Examples of the foaming agent used include chemical foaming agents and physical foaming agents which are usually used. Examples of the chemical foaming agent include azo compounds (for example, azodicarbonamide (ADCA), barium azodicarboxylate (Ba / AC), etc.), nitroso compounds (for example, N, N-dinitrosopentamethylenetetramine (DPT). )), A hydrazine derivative (for example, 4,4′-oxybis (benzenesulfonylhydrazide) (OBSH)), a semicarbazide compound, an azide compound, a triazole compound, an isocyanate compound, a bicarbonate salt (for example, sodium bicarbonate), Examples thereof include carbonates, nitrites, hydrides, a mixture of sodium bicarbonate and an acid (for example, sodium bicarbonate and citric acid), a mixture of hydrogen peroxide and yeast, a mixture of zinc powder and an acid, and the like.

Examples of physical blowing agents include aliphatic hydrocarbons (eg, butane, pentane, hexane, etc.), chlorinated hydrocarbons (eg, dichloroethane, dichloromethane, etc.), fluorinated chlorinated hydrocarbons (eg, chlorofluorocarbons). , Trichloromonofluoromethane, dichlorodifluoromethane,
Dichloromonofluoromethane, dichlorotetrafluoroethane, etc.), CFC substitutes, air, carbon dioxide gas, nitrogen gas,
Examples include water. These may be used alone or in combination of two or more. Preferably A
Mention may be made of DCA, OBSH, a mixture of sodium bicarbonate and an acid.

The proportion of the foaming agent mixed is, for example,
The amount is 0.01 to 20 parts by weight, preferably 0.05 to 15 parts by weight, based on 100 parts by weight of the thermoplastic resin. In addition, these foaming agents may be prepared as a masterbatch, for example.

The thus obtained carrier for water treatment of the present invention can be used for various water treatments, for example, wastewater treatment such as industrial wastewater and domestic wastewater, and more specifically, microorganisms are used. Water treatment, eg nitrifying bacteria (eg,
As a fluidized bed or fixed bed, especially as a fluidized bed of an aerobic tank for treating aerobic microorganisms such as ammonia oxidizing bacteria and nitrite oxidizing bacteria, and an anaerobic tank for treating anaerobic microorganisms such as denitrifying bacteria. Can be used. Figure 1
Shows an embodiment of such a water treatment device. That is, in FIG. 1, the water treatment apparatus includes a water treatment tank 1 used as an aerobic tank or an anaerobic tank, and a water supply pipe 2 and a drain pipe 3 connected to the water treatment tank 1. A water treatment carrier 4 of the present invention is put into the water treatment tank 1 as a fluidized bed, and is agitated by a stirrer 5 rotatably provided in the water treatment tank 1. Since the water treatment carrier 4 of the present invention is used as a fluidized bed in such a water treatment apparatus, the water treatment carrier 4 can be satisfactorily floated and settled in the water treatment tank 1. As a result, stable and efficient water treatment can be performed over a long period of time.

Although the water treatment carrier of the present invention is originally used for water treatment as described above, it can also be used for gas phase treatment, for example, for deodorizing ammonia, hydrogen sulfide and the like. it can.

[0026]

EXAMPLES The present invention will be described in more detail below by showing Examples and Comparative Examples, but the present invention is not limited to the Examples and Comparative Examples.

Example 1 Mixture of 80 parts by weight of hydrophilic thermoplastic polyurethane resin (diphenylmethane diisocyanate / polyoxyethylene propylene glycol (ethylene oxide content 80% by weight) and 20 parts by weight of polytetramethylene glycol / 1,4-butane Diol, trade name: Elastollan
OH3-37, Takeda-Bardiche Urethane Industry Co., Ltd., same below, and polyethylene resin (trade name: Evolue
100 parts by weight of a mixture of SP0510, manufactured by Mitsui Chemicals, Inc., and the same below, at a weight ratio of 8/2 was used to prepare an extruder (50 mmφ single screw extruder, L / D = 34, manufactured by Ikegai Co., Ltd.). The same shall apply hereinafter) was used to obtain a columnar carrier having an outer diameter of 5 mmφ and a length of 5 mm.

Example 2 A mixture 10 in which a hydrophilic thermoplastic polyurethane resin and a polyethylene resin are blended in a weight ratio of 7/3.
0 parts by weight was molded using an extruder and the outer diameter was 5 mm
A cylindrical carrier having a diameter of φ and a length of 5 mm was obtained.

Example 3 A mixture 10 in which a hydrophilic thermoplastic polyurethane resin and a polyethylene resin are mixed in a weight ratio of 8/2.
To 0 part by weight, 1.5 parts by weight of a foaming agent (mixture of sodium bicarbonate and citric acid, trade name: Hydrocelol CF, manufactured by Boehringer Ingelheim, the same applies below) was added, and an extruder was used. And molded to obtain a columnar carrier having an outer diameter of 5 mmφ and a length of 5 mm.

Example 4 A mixture 10 in which a hydrophilic thermoplastic polyurethane resin and a polyethylene resin are blended in a weight ratio of 7/3.
To 0 part by weight, 1.5 parts by weight of a foaming agent (mixture of sodium bicarbonate and citric acid, trade name: Hydrocelol CF, manufactured by Boehringer Ingelheim, the same applies below) was added, and an extruder was used. And molded to obtain a columnar carrier having an outer diameter of 5 mmφ and a length of 5 mm.

Example 5 A hydrophilic thermoplastic polyurethane resin and an AS resin (trade name: S310A, manufactured by Mitsubishi Rayon Co., Ltd., the same applies hereinafter) were used.
1.5 parts by weight of a foaming agent was added to 100 parts by weight of a mixture to be mixed in a weight ratio of 9/1, and the mixture was molded using an extrusion molding machine to give a cylindrical shape having an outer diameter of 5 mmφ and a length of 5 mm. A carrier was obtained.

Example 6 A hydrophilic thermoplastic polyurethane resin and an AS resin were used.
1.5 parts by weight of a foaming agent was added to 100 parts by weight of a mixture to be blended in a weight ratio of 7/3, and the mixture was molded using an extrusion molding machine to give a cylindrical shape having an outer diameter of 5 mmφ and a length of 5 mm. A carrier was obtained.

Example 7 A mixture 100 in which a hydrophilic thermoplastic polyurethane resin and an ABS resin (trade name: SWR-1, manufactured by Mitsubishi Rayon Co., Ltd., the same applies hereinafter) are blended in a weight ratio of 9/1. 1.5 parts by weight of a foaming agent, activated carbon (trade name: DO-
5, Takeda Yakuhin Kogyo Co., Ltd., same as below) 5 parts by weight are added,
Molded using an extrusion molding machine, outer diameter 5 mmφ, length 5 m
A columnar carrier of m was obtained.

Example 8 A mixture 100 in which a hydrophilic thermoplastic polyurethane resin and an ABS resin (trade name: SWR-1, manufactured by Mitsubishi Rayon Co., Ltd., the same applies hereinafter) are blended in a weight ratio of 7/3. 1.5 parts by weight of a foaming agent and 5 parts by weight of activated carbon were added to the parts by weight, and the mixture was molded using an extrusion molding machine to obtain a columnar carrier having an outer diameter of 5 mmφ and a length of 5 mm.

Example 9 A mixture 10 in which a hydrophilic thermoplastic polyurethane resin and a polyethylene resin are blended in a weight ratio of 8/2.
0 parts by weight, activated carbon 5 parts by weight, copper oxide (manufactured by Wako Pure Chemical Industries,
The same applies hereinafter) 0.2 part by weight was added and the mixture was molded using an extrusion molding machine to obtain a cylindrical carrier having an outer diameter of 5 mmφ and a length of 5 mm.

Example 10 A mixture 10 in which a hydrophilic thermoplastic polyurethane resin and a polyethylene resin are blended in a weight ratio of 8/2.
To 0 parts by weight, 1.5 parts by weight of a foaming agent, 5 parts by weight of activated carbon, and 0.2 parts by weight of copper oxide were added, and the mixture was molded using an extrusion molding machine to obtain a cylindrical shape having an outer diameter of 5 mmφ and a length of 5 mm. A carrier was obtained.

Comparative Example 1 Polyethylene resin and calcium carbonate were added in a weight ratio of 8
1.5 parts by weight of a foaming agent was added to 100 parts by weight of the mixture mixed at a ratio of / 2, and the mixture was molded using an extruder.
A columnar carrier having an outer diameter of 5 mmφ and a length of 5 mm was obtained.

Comparative Example 2 Hexamethylenediamine (manufactured by Wako Pure Chemical Industries, Ltd.) was added to cellulose acetate (manufactured by Wako Pure Chemical Industries, Ltd.), and a glutaraldehyde solution (manufactured by Wako Pure Chemical Industries, Ltd.) was added and reacted to form a carrier. Obtained.

Test Example 1 Each of the carriers obtained in Examples 1, 3, 5, 7 and Comparative Example 2 was immersed in activated sludge, taken out after half a year, and attached with an ultrasonic homogenizer. As a result of peeling and observing, the appearance of Examples 1, 3, 5, and 7 was not changed from that before the immersion, whereas in Comparative Example 2, the shape was slightly changed. In addition, as a result of drying at 110 ° C. and measuring the weight, in Examples 1, 3, 5, and 7, there was no change in weight from before dipping, whereas in Comparative Example 2, 90 wt.
% By weight.

Test Example 2 The carriers obtained in Examples 2, 4, 9, 10 and Comparative Example 1 were immersed in activated sludge to adsorb microorganisms. That is, a carrier with a bulk volume of 250 mL is added to a draft flow type water tank
Ammonia calculated from the amount of nitrite produced under the conditions of water temperature of 20 ° C., pH of 7.0 to 7.5, and hydraulic retention time of 5 hours, using an inorganic artificial wastewater having the composition shown below. It was evaluated by determining the oxidation rate.

Inorganic artificial wastewater composition (per liter) (NH ₄ ) ₂ SO ₄ 0.0943 g KH ₂ PO ₄ 0.6 g NaHCO ₃ 0.375 g MgSO ₄ .7H ₂ O 10 mg CaCl ₂ .2H ₂ O 1.8 mg Fe -EDTA 1 mg The results of evaluation by attaching ammonia-oxidizing bacteria to the carriers of Examples 2, 4, 9, 10 and Comparative Example 1 are shown in FIG. In FIG. 2, the carriers of Examples 2, 4, 9, and 10 are
Since the hydrophilic polyurethane resin was blended and the fluidity was good, it was found that the rate of ammonia oxidation was satisfactorily increased as compared with the carrier of Comparative Example 1 because the bacteria adhered well and grew. Further, it can be seen that in Examples 9 and 10 containing the substrate adsorbing substance and the substance that improves or promotes the enzyme activity, the rate of ammonia oxidation rises quickly and the maximum activity is high.

Further, the growth (dominance) of ammonia-oxidizing bacteria on the surface of each carrier is confirmed by the DNA probe method (FISH method).
Was evaluated. As a result, Examples 2, 4, 9, 10
It was confirmed that the ammonia-oxidizing bacteria proliferated and prioritized on the surface of the carrier. By observation, 90% were ammonia-oxidizing bacteria.

Test Example 3 Each carrier obtained in Examples 1 to 10 and Comparative Example 1
Is 0.5m in actual volume ³Use this for 5m³Aquarium (filled
Filled with 10%) and mechanically agitated aerator (output
0.75 kW, manufactured by Shin Meiwa Kogyo Co., Ltd.)
I did.

The carriers of Examples 1 to 10 were used in 2
Even after a lapse of weeks, the surface did not seem to be worn by visual observation, and as a result of detailed observation with a scanning electron microscope (SEM), it was confirmed that the surface was not worn. On the other hand, in the carrier of Comparative Example 1, one week after the start of the test, the surface visually appeared to be worn, and the water was turbid. In addition, a scanning electron microscope (S
As a result of detailed observation by EM), it was confirmed that the entire body was worn.

[0045]

The water treatment carrier of the present invention has a hydrophilic unit.
Of 10% to 95% by weight of hydrophilic heat
Plastic polyurethane resin and hydrophobic thermoplastic resin
Is blended in a weight ratio of 7/3 to 9/1, and melt-formed.
Since it is molded by the shaping method, it has a good affinity with microorganisms, and improves the fluidity of the water treatment carrier, and is not easily decomposed by microorganisms even after long-term use and retains its strength. And stable use can be secured.

Further, by molding the water treatment carrier of the present invention with a thermoplastic resin, a hydrophilic resin and a hydrophobic resin can be blended and uniformly melt-molded, and by the melt molding, It can be molded into any shape depending on the purpose and application.

Further, the water treatment carrier of the present invention contains a substrate adsorbing substance and / or a substance which improves enzyme activity or promotes growth, whereby microorganisms can be easily attached to the surface of the water treatment carrier. It can be attached and grown, and more efficient water treatment can be performed.

Moreover, when the water treatment carrier of the present invention is made porous, the porosity (also called porosity or porosity) of the water treatment carrier is appropriately selected by adjusting the compounding amount of the foaming agent to be used. Thereby, the specific gravity of the water treatment carrier can be adjusted by this foaming agent, and as a result, for example,
When used as a fluidized bed, the fluidity can be further improved.

Further, in the water treatment apparatus using such a water treatment carrier, the water treatment carrier flows well in the tank, so that efficient water treatment can be performed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a water treatment device of the present invention.

FIG. 2 is a diagram showing the evaluation results of Test Example 2, in which the ammonia oxidation rate is plotted against the elapsed days.

[Explanation of symbols]

1 water treatment tank 2 water supply pipe 3 drainage pipes 4 Water treatment carrier 5 stirrer

Continuation of the front page (56) Reference JP 62-171794 (JP, A) JP 10-180280 (JP, A) JP 11-276164 (JP, A) (58) Fields investigated (Int .Cl. ⁷ , DB name) C02F 3/10 WPI (DIALOG)

Claims (6)

(57) [Claims] 1. A hydrophilic unit comprising 10 to 95% by weight.
Hydrophilic thermoplastic polyurethane resin contained in combination
And a hydrophobic thermoplastic resin in a weight ratio of 7/3 to 9 /
Blended in a ratio of 1 and molded by the melt molding method
Characterized in that that the aqueous treating carrier. 2. The hydrophobic thermoplastic resin is at least one selected from the group consisting of polyethylene resin, polypropylene resin, polyvinyl acetate resin, polyacetal resin, acrylonitrile-butadiene-styrene resin, and acrylonitrile-styrene resin. Characterized by,
The water treatment carrier according to claim 1 . 3. A porous structure,
The water treatment carrier according to claim 1 or 2 . 4. The water treatment carrier according to any one of claims 1 to 3 , which contains a substrate adsorbing substance and / or a substance that enhances enzyme activity or promotes growth. 5. The hydrophilic unit is 10 to 95% by weight.
Hydrophilic thermoplastic polyurethane resin contained in combination
And a hydrophobic thermoplastic resin in a weight ratio of 7/3 to 9 /
A method for producing a carrier for water treatment , comprising blending in a ratio of 1 and molding by a melt molding method. 6. A hydrophilic unit comprising 10 to 95% by weight.
With a hydrophilic thermoplastic polyurethane resin included in combination
7/3 to 9/1 weight ratio of hydrophobic thermoplastic resin
An apparatus for water treatment, characterized in that a carrier for water treatment which is blended together and molded by a melt molding method is used.