JPH08332489A - Antimicrobial fluid separating element - Google Patents

Abstract

PURPOSE: To make it possible to obviate the propagation of bacteria and microorganisms by adhesion on nets existing in a supply liquid flow passage and simultaneously to suppress the degradation in sepn. performance and permeated water volume and the increase in pressure drop, respectively, by imparting an antimicrobial agent to a supply liquid flow passage material. CONSTITUTION: This fluid separating element is formed by constituting a unit formed by holding the separated liquid flow passage material 5 between plural fluid separating membranes 3 and 4 and sealing the remaining three ways of both fluid separating membranes 3, 4 in such a manner that these membranes open only to the direction of a central pipe 1 having a hole 2 and the supply liquid flow passage material 6 to be integrated to one unit. The supply liquid 10 is supplied from the one end face of the fluid separating element, and while the liquid is discharged as a concd. liquid 12 from the other end face, the separated liquid 11 transmitted through both fluid separating membranes 3, 4 is taken out of the central pipe 1 via the separated liquid flow passage material 5. In such a case, the antimicrobial property is imparted to the supply liquid flow passage material 6. As a result, the propagation of the bacteria and microorganisms by adhesion on the nets existing in the supply liquid flow passage is obviated. The degradation in the sepn. performance and the permeated water volume and the increase in the pressure drop are simultaneously suppressed, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid separation element using a fluid separation membrane. More specifically, the fluid separation element is generally used for various liquid separations such as pure water production, seawater desalination, recovery of valuables, and concentration.
INDUSTRIAL APPLICABILITY The present invention improves the supply liquid flow path material of the fluid separation element to significantly reduce the pressure loss due to microorganisms adhering to the supply liquid flow path material that gradually occurs when the liquid passes, and maintains stable performance. It is the one to be confused.

[0002]

2. Description of the Related Art First, the structure of a fluid separation element will be described with reference to the drawings. As shown in FIG. 1, a separation liquid channel material 5 is sandwiched between a first fluid separation membrane 3 and a second fluid separation membrane 4, and an opening is provided only in the direction of a central tube 1 having a hole 2. As described above, the remaining three directions of the first fluid separation membrane and the second fluid separation membrane are sealed in an envelope shape with an adhesive or the like and the supply liquid flow path member 6 as one unit. The unit is wrapped around a central tube to form a fluid separation element.
While the supply liquid 10 is supplied from the end face of the fluid separation element and discharged as the concentrated liquid 12 from the other end face, the separation liquid 11 that has passed through the fluid separation membranes 3 and 4 passes through the separation liquid flow path member 5 and the central pipe 1 Taken out.

Generally, the function required of the supply liquid flow path member is that which uniformly supplies the liquid onto the membrane surface and has a small flow resistance. Conventionally, commercially available nets made of polypropylene or polyethylene are used. A schematic diagram of the conventional net is shown in FIG. Further, the cross-sectional structure is shown in FIG.
Shown in

[0004]

Generally, since the feed liquid contains a large amount of bacteria and microorganisms, a germicide such as chlorine or chloramine is used to sterilize the bacteria or microorganisms in the feed liquid. At the same time, the bactericide is used at a concentration as low as possible because it deteriorates the fluid separation membrane, or after sterilization, the bactericide is neutralized with a reducing agent such as sodium sulfite and then passed through the fluid separation element.

The appropriate concentration of the oxidizing agent varies depending on the type and amount of bacteria and microorganisms in the feed liquid, or the type and dissolution amount of metals in the feed liquid. For this reason, it varies from plant to plant or even in the same plant depending on the season.

For this reason, the concentration of the oxidant is often too high to deteriorate the fluid separation membrane, or when the concentration of the oxidant is too low to use a conventional net as a feed liquid flow path material, bacteria and microorganisms propagate and adhere to the net. Therefore, a narrow portion is formed in the supply liquid flow path, the supply liquid does not flow uniformly in the fluid separation element, concentration polarization occurs, and the amount of permeated water decreases, or the separation performance decreases, and further when the liquid passes through. There is a problem that the generated pressure loss is greatly increased.

[0007]

The present invention is intended to solve the problem that bacteria and microorganisms propagate and adhere to the net in the feed liquid flow path, and the object is basically achieved by the following constitution. It is a thing.

That is, "a unit in which a first liquid separation membrane, a separation liquid flow passage material, a second fluid separation membrane and a supply liquid flow passage material are provided as a set around a hollow central tube having holes on the surface. In the fluid separation element formed by winding a single set or a plurality of sets, the feed liquid flow path material has an antibacterial property.

Although the degree of antibacterial property and the antibacterial spectrum are not particularly limited, for example, the difference in the increase or decrease in the number of bacteria may be 1.6 or more, more preferably 2.6 or more based on the following criteria. . In addition, a silver-based inorganic antibacterial agent such as silver zeolite, a compound having an amidine group or a guanidine group, or a quaternary ammonium salt is contained in a weight percentage within the range described below.
It is preferable that the antibacterial property is such that it can be achieved by being contained.

[Evaluation Method of Antibacterial Property] As a test method, a bacterial count measuring method is adopted. The test bacterium is Staphylococcus aureus (Sta
-phylococcus Aureus ATTC6
538p) is used. The test method is as follows: A sterilized sample cloth is poured with a broth suspension of the above-mentioned test bacteria and kept in a closed container at 37 ° C for 1
After culturing for 8 hours, the number of viable cells is counted, and the number of cells is compared with the number of cells inoculated.

Under the condition of log (B / A)> 2, log
(B / C) is the difference in the increase / decrease value of the number of bacteria, and 1.6 or more is the pass level.

[0012] where A is the number of bacteria that were dispersed and recovered immediately after inoculation of the unprocessed product, B is the number of bacteria that were dispersed and recovered after 18 hours of culture of the unprocessed product, and C is the number of bacteria that were dispersed and recovered after 18 hours of culture of the processed product. Represent.

As a method of imparting antibacterial properties, there are a method of coating a net with a nitrogen-containing compound such as a quaternary ammonium salt and a method of incorporating a silver-based inorganic antibacterial agent such as silver zeolite into the net material. . In the coating method, the antibacterial component is added to the net member at 0.05 to 3.0.
It is desirable to add wt%. If it is 0.05 wt% or less, the antibacterial property tends to be insufficient, and if it is 3.0 wt% or more, the net tends to be brittle.

[Silver Zeolite] The silver zeolite compound used in the present invention is represented by the following general formula [I] Ag _x H _y A _z M ₂ (PO ₄ ) ₃ [I] (A is an alkali metal, M is Zr, Ti. Or Sn, x, y
And z are each positive numbers less than 1 and x + y + z =
It is 1. ) Is a compound represented by. This is space group R
3c is a compound in which each constituent ion forms a three-dimensional network.

In the above formula, A is an alkali metal, specifically a metal such as Li, Na and K, and M is Zr,
Ti or Sn.

The following are specific examples of the above-mentioned phosphate compound.

Ag _0.01 H _0.95 Li _0.04 Zr ₂ (PO ₄ ) ₃ Ag _0.05 H _0.85 Li _0.10 Zr ₂ (PO ₄ ) ₃ Ag _0.10 H _0.80 Li _0.10 Ti ₂ (PO ₄ ) ₃ Ag _0.10 H _0.85 Li _0.05 Zr ₂ (PO ₄ ) ₃ Ag _0.20 H _0.75 Na _0.05 Ti ₂ (PO ₄ ) ₃ Ag _0.30 H _0.45 Na _0.25 Zr ₂ (PO ₄ ) ₃ Ag _0.35 H _0.60 Na _0.05 Sn ₂ (PO ₄ ) ₃ Ag _0.50 H _0.45 K _0.05 Sn ₂ (PO ₄ ) ₃ Ag _0.50 H _0.40 Li _0.10 Ti ₂ (PO ₄ ) ₃ Ag _0.70 H _0.25 K _0.05 Ti ₂ (PO ₄ ) ₃ Ag _0.92 H _0.05 Li _0.03 Zr ₂ (PO ₄ ) ₃ Phosphoric Acid The salt compound is obtained, for example, as follows.

That is, a compound containing an alkali metal such as lithium carbonate (Li ₂ CO ₃ ) or sodium carbonate (Na ₂ CO ₃ ), Zr such as zirconium oxide (ZrO ₂ ) or titanium oxide (TiO ₂ ), Ti or Compounds containing Sn and ammonium dihydrogen phosphate (NH ₄ H ₂ PO
₄ ) and other compounds containing a phosphate group in a molar ratio of about 1:
Mix the mixture to give a ratio of 4: 6, 1100-140
By firing at 0 ° C., the general formula AM ₂ (PO ₄ )
After obtaining a compound represented by ₃ (A and M are the same as above), by dipping this in an aqueous solution of an inorganic acid such as nitric acid, sulfuric acid and hydrochloric acid at room temperature to 100 ° C.
Obtain _{(1-Z) A Z M} 2 (PO 4) compounds represented by ₃ [II]. Further, by immersing this in an aqueous solution containing silver ions at an appropriate concentration, the general formula Ag _x H _y A _z M ₂
A compound [I] represented by (PO ₄ ) ₃ is obtained.

Generally, x and y in the compound [I]
Since the larger the value of, the higher the antifungal and antibacterial properties can be exhibited, the smaller the value of z in the compound [I] is, the more preferable value is less than 0.3. Further, the lower limit is preferably set to 0.05 or more from the viewpoint of ease of ion exchange reaction between alkali ions and H ions.

Even if the value of x is extremely small, antifungal and antibacterial properties can be exhibited, but if it is less than 0.001, it may be difficult to exhibit antifungal and antibacterial properties for a long time. And considering economy,
The value is preferably 0.01 or more and 0.5 or less.

Further, the value of x is appropriately adjusted by adjusting the concentration of silver in the aqueous solution or the time or temperature for immersing the compound [II] in the aqueous solution, depending on the required characteristics and use conditions. can do.

Since the value of y is equal to (1-x-z), if the values of x and z are set in the preferable ranges as described above, the preferable value of y is larger than 0.2 and 0. .94
It is determined from the following values.

This compound is stable to exposure to heat and light, has no change in structure and composition even after heating at 800 ° C., and does not undergo any discoloration upon irradiation with ultraviolet rays. Therefore, unlike the conventional organic antibacterial agents, there is no restriction on the processing conditions for obtaining various molded products, such as heating temperature or light shielding conditions.

The silver compound used as an antibacterial agent in the present invention is
As shown below, it exhibits antifungal and antibacterial properties by the combined action involving silver ions and H ions.

First, when the compound [I] comes into contact with water,
A very small amount of silver ions are ionized and eluted. The silver ion concentration required for exhibiting antifungal and antibacterial properties varies depending on the target fungus, type of bacteria and environment, but is several μg /
It is said to be in the range of l to several hundred μg / l.

In the antibacterial agent of the present invention, this elution amount can be easily controlled by determining the values of x and y in the general formula. It is considered that this is because the bond between the silver atom and the oxygen atom in the compound has a strong covalent property, so that the elution can be made extremely small.

The H ion in the compound [I] exists in the compound by ionic bond with an oxygen atom and can be easily liberated by contact with water until ionic equilibrium is reached. Becomes acidic, and it is effective in suppressing the generation of fungi and bacteria that are sensitive to acid.

The above complex action is an action not found in clay minerals such as zeolite.

The silver zeolite has a particle size of 0.3 to 0.
8 μm1, true specific gravity 2.5 to 3.5, apparent specific gravity 0.15
Those having a water content of ˜0.25 g / cm ³ and a water content of 1% or less exhibit stable performance without impairing productivity.

As a silver-based inorganic antibacterial agent, "NOVALON AG300" manufactured by Toagosei Kagaku Kogyo Co., Ltd. is well known. Mixing rate of silver based inorganic antibacterial agent is 0.02-3.0wt
%, Preferably 0.08 to 1.2%. 0.0
If it is 2 wt% or less, the antibacterial property tends to be insufficient, and if it is 3.0 wt% or more, the properties such as the strength of the net member tend to change [a compound having an amidine group or a guanidine group or a quaternary ammonium salt]. As the nitrogen-containing compound used as, various compounds are used. For example, a compound having a basic group such as an amidine group or a guanidine group or a salt thereof such as a sodium salt, a potassium salt or an ammonium salt, and a quaternary ammonium salt may, for example, be mentioned. Examples of the compound containing an amidine group include 4,4′-stilbene dicarboxamidine-diisethionate (that is, stilbamine isethionate), N ′-(4-chloro-2-methyl-phenyl) -N. , N-dimethyl-methanimide (that is, chlordimeform) and the like, as the compound containing a guanidine group, 1,17-diguanidino 9-otherheptadecane (that is, guazatine), p- (chlorophenyldiguanide) -Hexane (that is, chlorhexidine), p-benzoquinone-amidinohydrazone-thiosemicarbazone (that is, ambazone), and the like, and quaternary ammonium salts include benzalkonium chloride, benzethonium chloride, and the like. You can Of course, these compounds are examples, and it goes without saying that compounds other than the above can be used. Among the above compounds, p- (chlorophenyldiguanide) -hexane or a salt thereof is preferable because it has high safety and the antibacterial activity does not decrease in the presence of proteins and the like.

The antibacterial component having such a basic functional group is
It is preferably used after reacting with an acidic group-containing polymer (which may be a homopolymer or a copolymer) which reacts with this. Examples of the acidic group-containing monomer constituting the acidic group-containing polymer include sulfone group, carboxyl group, phosphon group, phenolic-hydroxyl group and other acidic groups, or salts thereof such as sodium salt, potassium salt and ammonium salt. And a monomer having

Examples of the monomer having a sulfone group include styrenesulfonic acid, vinylsulfonic acid, allylsulfonic acid, sulfopropylacrylate, sulfopropylmethacrylate, 3-chloro-4-vinylbenzenesulfonic acid, 2-acrylamido-2-methyl. Propanesulfonic acid, 2-acryloyloxybenzenesulfonic acid, 2-
Acryloyloxynaphthalene-2-sulfonic acid, 2-
Methacryloyloxynaphthalene-2-sulfonic acid, 2
-Hydroxy-3-methacryloyloxyfuropyl sulfonic acid and the like, as the monomer containing a carboxyl group, acrylic acid, methacrylic acid, itaconic acid, crotonic acid, maleic acid, maleic anhydride, 3-butene-1,
Examples of monomers having a phosphon group include 2,3-tricarboxylic acid and 4-pentenoic acid, and allylphosphonic acid, acid phosphoxyethyl methacrylate, and 3-
Chloro-2-acid phosphoxypropyl methacrylate, 1-methylvinylphosphonic acid, 1-phenylvinylphosphonic acid, 2-phenylvinylphosphonic acid, 2-methyl-2-phenylvinylphosphonic acid, 2- (3-chlorophenyl) vinyl Examples of the monomer having a phenolic hydroxyl group such as phosphonic acid and 2-diphenylvinylphosphonic acid include o-oxystyrene and o-vinylanisole.

These monomers may be used alone or in combination of two or more kinds. Moreover, you may use together the other monomer which can be copolymerized with the monomer which has these acidic groups. Such a monomer can be selected from a wide range depending on the use of the final product antibacterial fiber. Specific examples thereof include acrylonitrile, acrylic acid ester, methacrylic acid ester, vinyl chloride, vinyl acetate, vinyl propionate, vinylidene chloride, ethylene, propylene, styrene and its derivatives, butadiene, acrylamide and its derivatives, hydroxyethyl acrylate, hydroxyethyl. Examples thereof include methacrylate.

As the polymerization method, an emulsion polymerization method,
Any ordinary polymerization method such as a solution polymerization method or a bulk polymerization method can be adopted. Among them, the emulsion polymerization method is preferably used because a large amount of acidic groups tend to be distributed on the particle surface of the obtained polymer.

An antibacterial reaction product is obtained by reacting an acidic group-containing polymer obtained by polymerizing such a monomer with a basic group-containing antibacterial component.

Among the quaternary ammonium salts, the compound represented by the formula [III] is particularly preferable because it achieves a highly safe antibacterial and deodorant effect without causing a change in feeling and a decrease in friction fastness. Used.

[0037]

Embedded image (R ¹ is an alkyl group having 12 to 16 carbon atoms, R ² , R ³ ,
R ⁴ represents an alkyl group having 1 to 2 carbon atoms, and Bu represents a butyl group. ) In the formula [III], R ¹ is an alkyl group having 12 to 16 carbon atoms and has 11 or less carbon atoms or 1
When it is 7 or more, the antibacterial activity becomes insufficient.

In the formula [III], R ² , R ³ ,
R ⁴ is an alkyl group having 1 to 2 carbon atoms,
When the number of carbon atoms is 3 or more, the viscosity is increased, which is not preferable in production and the solubility in water is lowered.

As the anion used for neutralizing the quaternary ammonium salt group, an alkyl phosphate ion is selected for reasons of rust prevention. Further, as the alkyl group, a carbon number of 4, that is, a butyl group is selected. As the butyl group, n-butyl group, iso-butyl group, ter
Any t-butyl group is preferably used.

When the number of carbon atoms in the alkyl group is 3 or less, it is not preferable in terms of safety. When the number of carbon atoms in the alkyl group is 5 or more, the viscosity becomes high and synthesis becomes difficult, and the number of alkyl groups is 1 or 2. It becomes a mixture of alkyl phosphate ions, which is not preferable in terms of safety.

In addition, when used in combination with a melamine compound,
Further, it is more preferable to use an antibacterial resin having an excellent antibacterial property, which can impart the antibacterial property to the fiber material safely and easily and which does not corrode the processing equipment.

In the present invention, the antibacterial resin is a vinyl polymer or copolymer having a quaternary ammonium chloride monovalent or divalent phosphate group represented by the following formula [IV] or [V]: It consists of coalescing.

[0043]

Embedded image

Embedded image (In the above formulas [IV] and [V], R represents a polymer main chain or an organic residue, R ¹ represents an alkyl group having 8 to 18 carbon atoms, and R ² represents alkyl having 1 to 18 carbon atoms. Group, a phenyl group or a substituted aryl group.) A vinyl polymer or copolymer having a quaternary ammonium chloride phosphate group represented by the above formula [IV] or [V] has excellent antibacterial properties. have. Moreover,
Since it is a polymeric substance having amphoteric properties, it can be firmly attached to synthetic fibers and natural fibers. Therefore, it is possible to obtain an antibacterial fiber structure having excellent durability and washing durability. Further, since it is obtained as an aqueous solution or a water-alcohol mixed solution, it has an advantage that it can be easily applied to a fiber material and that the device is not corroded.

Next, examples of the melamine compound used in the present invention include those represented by the following general formula.

[0045]

[Chemical 4] ^{Wherein, R 0 ~R 2: -H,} -OH, -C 6 H 5, C n H
_{2n + 1 (n: 1~10)} , - COOC n H 2n + 1 (n:
^{1~20), - CONR 3 R 4} , -NR 3 R 4 (R 3,
^{R 4: -H, -OH),} - OCn H 2n + 1, -CH 2 O
_{C n H 2n + 1, -CH} 2 COO n H 2n + 1 (n: 1~2
_{0), - CH 2 OH,} -CH 2 CH 2 OH, -CONH
_{2, -CONHCH 2 OH, -O (} X-O) n R
_{^{5 (X: -C 2 H 4}} -, - C 3 H 6 -, - C 4 H 8 -,
_{n: 1~1500, R 4: -H} , -CH 3, -C
_{2 H 5, -C 3 H 7} ) even preferred compound among the above general formula, R ^0, R ¹ is a compound which is -NR ³ R ^4, Among them are R ² -CONR ³ R ^4, - More preferably, it is NR ³ R ⁴ . Further, R ³ and R ⁴ are —CH ₂ OH and —CH ₂ CH ₂
OH, -CONH _2, compound a -CONHCH ₂ OH is particularly preferred.

Needless to say, these compounds are only examples, and compounds and derivatives other than the above may be used.

A melamine compound having at least two polymerizable functional groups is preferable because the durability of the resin coating formed on the fiber surface is improved.

Thus, as the antibacterial component, the antibacterial single component or the antibacterial reaction product obtained by reacting the antibacterial component with the acidic group-containing polymer or / and copolymer and the melamine compound as a main film-forming component are used. The film is formed on the surface of the fibers constituting the fiber structure. The mechanism of action for the durability of the film is that the melamine compound, which is the film forming main component, is polymerized in the fiber matrix polymer. Alternatively, it is cross-linked to form a two-dimensional or three-dimensional structure, and at the same time, a part of it causes a chemical bond with the functional group of the fiber matrix polymer, which is insolubilized in a net form and firmly adheres to the fiber, thereby significantly improving the durability of the film. Therefore, it is possible to exert excellent hot water washing resistance and dry cleaning resistance.

As a typical example of the method of applying the antibacterial component and the main film-forming component to the fiber structure, the structure is treated in the same treatment bath in which a polymerization initiator or a crosslinking catalyst is added to an aqueous liquid containing the component. After coating or spraying, the reaction treatment is performed under wet conditions. The reaction can be carried out at room temperature or higher, but is usually steamed. The above two components can be treated in separate baths. That is, first, the fiber structure was putted or spray-treated in a treatment bath containing an antibacterial component, then dry heat or steam heat treated, and then a polymerization initiator or a cross-linking catalyst was added to an aqueous liquid containing the film-forming main component. The structure may be subjected to coating or spray treatment in another treatment bath and steam heat treatment.

The polymerization initiator is used when polymerizing an acrylic compound having an alkylene glycol unit. Specific examples include ammonium persulfate, potassium persulfate,
A general vinyl polymerization initiator such as azobisisobutyronitrile may be used, and by selecting the type of the polymerization initiator, the coating treatment can be appropriately performed under desired treatment conditions.

On the other hand, the catalyst is used when a melamine compound is subjected to a crosslinking reaction, and specific examples thereof include various organic carboxylic acids such as formic acid and acetic acid and their organic salts such as ammonium, sodium and potassium, and sulfuric acid and peroxide. Examples thereof include inorganic salts such as ammonium, sodium, potassium, magnesium, zinc, aluminum and iron such as sulfuric acid, hydrochloric acid, phosphoric acid and nitric acid, and double salts thereof. Of course,
The compounds described above are not limited.

This steaming heat treatment is carried out at 80 to 140 ° C., preferably 100 to 130 ° C. for 0.5 to 30 minutes. The dry heat treatment is 80 to 150 ° C., preferably 100 to
After drying at 130 ° C., it is performed at 100 to 220 ° C., preferably 140 to 190 ° C. for 0.5 to 5 minutes.

According to the method of the present invention, other chemicals such as a water repellent agent, a water absorbing agent, an antistatic agent and the like may be added to the treatment liquid used for the coating or spraying treatment.

When the antibacterial agent is coated, other additives such as improving the fixing property of the antibacterial agent may be used. Although not particularly limited, examples of the agent that improves the fixing property include melanin compounds. There is no particular limitation so long as the above effect is achieved, but the melanin compound is contained in an amount of 0.05 to 2.0 wt%.
It is desirable to add, more preferably 0.1 to 1.
It is 2 wt%. Further, the addition method may be mixed with the antibacterial agent solution or before or after coating with the antibacterial agent, but it is preferable that both are mixed in order to enhance the antibacterial effect and the fixing effect. Is preferably mixed and coated, or any of the coating solutions is preferably dried before being completely dried.

In this method, instead of the net, a film having irregularities on the surface used for the supply liquid flow path may be used.

As the material of the channel material, polypropylene, polyethylene, nylon, polyester or the like is preferably a net-like material having a pitch of 1.5 to 4.5 mm1 and a thickness of 0.5 to 1.0 mm.

The use and application of the antibacterial fluid separation element of the present invention is not particularly limited, and the separation of a liquid from a liquid, the separation of a gas from a liquid, or the separation can be performed by appropriately selecting a separation membrane or the like. It is also possible to select an aqueous solution or a non-aqueous solution as the target liquid. Particularly preferably, it is used for separation of an aqueous solution, for example, desalination of seawater, production of ultrapure water, and concentration of components in food such as juice and soup stock. In the separation of such an aqueous solution,
A crosslinkable polyamide membrane is particularly suitable as the separation membrane.

[0058]

[Embodiment] Next, an embodiment according to the present invention will be described.

A comparative test was conducted using a fluid separation element using a polypropylene net having a pitch of 3.8 mm × 3.8 mm and a thickness of 0.8 mm.

In Example 1, silver zeolite (Novalon AG
300) is a fluid separation element using an antibacterial net in which 1% is mixed. Comparative Example 1 is a fluid separation element using a conventional polypropylene net. River water was used as feed water, 0.5 ppm of chlorine was added, and then 5 ppm of sodium sulfite was added, and water was passed through the fluid separation element at a pressure of 15 kg / cm ² and the recovery rate was 20% and the operation was performed for 6 months. The separation performance, the amount of permeated water, and the pressure loss at that time are shown in Table 1, and the effect of Sample 1 of the present invention was proved.

[0061]

[Table 1]

[0062]

As described above, the fluid separation element of the present invention is
It was found that the use of a feed liquid flow path material having antibacterial properties, compared to the conventional one, resulted in less reduction in separation performance and permeated water, and less increase in pressure loss.

[Brief description of drawings]

FIG. 1 is an external view showing a fluid separation element in which a part thereof is cut and unwound.

FIG. 2 is a top view of a net used as a supply liquid flow path member.

3 is a sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1: Central Tube 2: Hole 3: First Fluid Separation Membrane 4: Second Fluid Separation Membrane 5: Separation Liquid Channel Material 6: Supply Liquid Channel Material 7: End Plate 8: End Plate 9: Sealing Material 10 : Supply liquid 11: Separation liquid 12: Concentrated liquid 13: Filament winding 14: Strand 1 15: Strand 2

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI Technical display location C02F 1/50 560 C02F 1/50 560E B01D 39/14 B01D 39/14 G 39/16 39/16 C 63/10 63/10

Claims (7)

[Claims] 1. An antibacterial fluid separation element, wherein the supply liquid flow path material has antibacterial properties. 2. A unit in which a first liquid separation membrane, a separation liquid flow path member, a second fluid separation membrane and a supply liquid flow path member are provided as a set around a hollow central tube having holes on its surface. An antibacterial fluid separation element characterized by being formed by winding a single set or a plurality of sets. 3. The fluid separation element according to claim 1, wherein
An antibacterial fluid separation element, wherein the supply liquid channel material is a net having antibacterial properties. 4. The supply liquid flow path material is a film having concave and convex grooves on a surface having antibacterial properties.
The antibacterial fluid separation element described. 5. The antibacterial fluid separation element according to claim 1, wherein the supply liquid flow path material contains silver zeolite. 6. The antibacterial fluid separation element according to claim 1, wherein the feed liquid flow path material has a compound having an amidine group or a guanidine group or a quaternary ammonium salt. 7. A method for separating and treating an aqueous solution, which comprises using the fluid separation element according to claim 1.