JP2006110536A - Alga-proof plate, alga-proof film, and alga-proof overflow plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an alga-proof plate or an alga-proof film, which prevents an alga from adhering to a waterway and the cleaning time of which is remarkably shortened and to provide an alga-proof overflow plate which is used in the waterway of a final sedimentation basin, is easily machined at a site and is executed in a few days and on/to which the alga hardly grows/adheres and which can be cleaned easily even when the alga grows. <P>SOLUTION: This alga-proof plate is used in such a manner that the alga-proof plate is arranged at the least on the inside of the final sedimentation basin or the waterway of a sewage treatment facility. This alga-proof plate is provided with a base plate 41 and a fluorocarbon resin layer 43 formed on at least one side of the base plate 41. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention particularly relates to an algae-proof plate, an algae-proof membrane and an algae-proof overflow plate used in the overflow section of the final sedimentation basin of a sewage treatment facility and the subsequent water collection channel.

  In recent years, there has been a remarkable spread of sewage, and accordingly, maintenance work of sewage treatment plants has also increased significantly. In particular, in the final sedimentation basin, algae adhere to the overflow section and the subsequent catchment due to the abundance of dissolved oxygen and sunlight, and much labor and time are spent on the removal and cleaning work. In addition, algae attached to the overflow plate attached to the overflow section of the settling basin increases the overflow load. Furthermore, the algae partially peeled off in the overflow section and the catchment channel will float and cause water quality deterioration, cause algae accumulation at the discharge port, and cause problems such as a decrease in the treatment capacity of the sewage treatment facility. .

Conventionally, the following techniques have been proposed to solve these problems.
(1) A technology in which the overflow plate and the surface of the catchment channel or themselves are made of a material with little adhesion of algae, for example, SUS plate, or FRP made of general-purpose resin such as epoxy resin or unsaturated polyester resin.
(2) Overflow plate and catchment surface surface or the material itself that inhibits algae growth, such as copper plate, or material with copper foil attached to FRP surface made of general-purpose resin such as epoxy resin, unsaturated polyester resin, etc. Consists of.

Conventionally, Patent Document 1 and Patent Document 2 are known as techniques for taking measures against algae on the catchment itself.
In Patent Document 1, a waterproof layer is formed on the surface of a concrete frame, which is a constituent material of a water passage, via a base layer, and a waterproof protective layer is further formed thereon, and then copper or a copper alloy is formed on the waterproof protective layer. It is a technique for forming an anti-algae coating layer by spraying. In Patent Document 2, the water collection channel itself is formed in a groove shape with a core material made of reinforced plastic such as FRP and copper foil laminated on both sides thereof, and can be installed without using a concrete frame. This is a technology related to waterways.
JP-A-10-204602 (Claims, paragraph numbers [0020] to [0022], etc.) JP-A-6-328090 (Claims, paragraph number [0016], etc.)

However, the above-described prior art has the following problems.
In the case of the SUS plate of (1), there are problems such as difficulty in processing, the number of working days required, and high cost. In addition, FRPs made of general-purpose resins such as epoxy resins and unsaturated polyester resins also have problems such as incomplete algae resistance, water absorption, deterioration due to ultraviolet rays, and weakness to acid-alkali.

  On the other hand, in the case of the copper plate (2), there are problems such as being heavy and expensive, thinning due to electric corrosion and forming a hole, and requiring an operation day. In addition, a material in which a copper foil is attached to the surface of an FRP made of a general-purpose resin such as an epoxy resin or an unsaturated polyester resin is attached to algae when the copper foil is ionized and the FRP is exposed, and is vulnerable to acid alkali. There is a problem.

  The present invention is easy to process, has a short construction period, can achieve weight reduction and cost reduction, is less likely to generate algae, and is easy to clean even if algae is generated. The purpose is to provide an overflow plate.

  An algal barrier plate according to the present invention is a substrate and a fluororesin formed on at least one side of the substrate in an algal barrier plate used at least inside a final sedimentation basin or a water collection channel of a sewage treatment facility. It is characterized by comprising a layer.

The algal barrier membrane according to the present invention is an algal barrier membrane used at least inside the final sedimentation basin or water collecting channel of a sewage treatment facility. A fluororesin layer to be coated is provided.
In addition, the algal barrier membrane according to the present invention is composed of a fluororesin simplex film or sheet in an algal barrier membrane used at least inside the final sedimentation basin or water collection channel of a sewage treatment facility. Features. Examples of the film or sheet include a case of containing carbon, a case of containing titanium oxide photocatalyst particles, or a case of containing an antibacterial agent.

  Further, the algae-proof overflow plate according to the present invention is a glass fiber woven fabric and the glass fiber used in the algae-proof overflow plate used by being disposed at the upper end of the final sedimentation basin or catchment channel of the sewage treatment facility. It comprises a laminate having at least one sheet composed of a fluororesin layer covering both sides of the woven fabric, and a copper foil laminated on both sides of the laminate.

  Furthermore, the algae-proof overflow plate according to the present invention is an algae-proof membrane used by being disposed at the upper end of a water collection channel of a sewage treatment facility. It comprises a copper foil disposed on both sides.

  According to the algae-proof plate or the algae-proof membrane of the present invention, the number of construction days to the water collection channel of the sewage treatment facility is short, light weight and cost reduction can be realized, and further, the adhesion of algae is small, and Even if algae adheres, cleaning can be performed easily. In addition, according to the algae-proof overflow plate of the present invention, it is possible to reduce the weight and cost for the water collection channel of the final sedimentation basin, and there is little adhesion of algae, and even if algae adheres. Easy cleaning.

Hereinafter, the algae-proof plate, the algae-proof membrane and the algae-proof overflow plate according to the present invention will be described in detail.
1) An algae-proof board according to the present invention is formed on a substrate and at least one side of the board in an algae-proof board used by being disposed at least inside a final sedimentation basin or a water collection channel of a sewage treatment facility. A fluororesin layer is provided. This algae-proof board has the structure shown, for example in FIG. That is, the algal barrier plate is an algal barrier plate having a configuration in which an ETFE film (fluororesin layer) 43 is formed on the substrate 41 with the adhesive layer 42 interposed therebetween. Here, examples of the substrate include metals such as SUS304, ceramics, and resins. Examples of the fluororesin layer include a layer made of a melt type fluororesin, a fluororesin layer containing titanium oxide photocatalyst particles, and a fluororesin layer containing an antibacterial agent. The fluororesin layer may be formed on both sides of the substrate.

  2) The first algae-proof membrane according to the present invention is a glass-fiber woven fabric and the glass-fiber weave used in the anti-algae membrane used at least inside the catchment final sedimentation basin of a sewage treatment facility. It has a fluororesin layer that covers both sides of the fabric. This algae-proof membrane has, for example, the configuration shown in FIG. That is, it is an algal barrier film formed by coating the fluororesin layer 12 on both surfaces of the glass fiber woven fabric 11 composed of the warp yarn 11a and the weft yarn 11b. Here, the fluororesin layer 12 can be replaced with a fluororesin layer containing titanium oxide photocatalyst particles or an antibacterial agent as a filler. Further, instead of the fluororesin layer 12, a melt type fluororesin layer can be used. Here, as the melt type fluororesin, tetrafluoroethylene perfluoroalkyl vinyl ether copolymer resin (PFA), tetrafluoroethylene-hexafluoropropylene copolymer resin (PFEP), tetrafluoroethylene-ethylene copolymer resin (ETFE), vinylidene fluoride resin (PVDF), ethylene trifluoride chloride resin (PCTFE), and vinyl fluoride resin (PVF).

  The algae-proof membrane is usually 5 to 6 times until a predetermined thickness is reached, for example, a glass fiber woven fabric is impregnated with a fluororesin simple aqueous dispersion and dried and baked at a temperature equal to or higher than the melting point of the fluororesin. It is manufactured by. In this case, as the glass fiber woven fabric, a non-alkali glass fiber woven fabric for electrical insulation having a thickness of 0.100 mm to 0.25 mm is preferably used, and a thickness of 0.125 mm to 0.35 mm (containing fluororesin relative to glass) An amount of about 50% by weight) is obtained. Here, from the viewpoint of the method for using the algae-proofing membrane, when the thickness is less than 0.125 mm, the material becomes non-durable, and when the thickness exceeds 0.35 mm, the obtained material is intended for use. The result does not follow the inner contour of the catchment channel. When the algae-proof membrane of the present invention is applied to a catchment channel, the catchment channel is covered with the algae-proof membrane and the surface is made of fluororesin, so even if algae is generated, it is difficult to adhere and easily removed It is possible, and cleaning work becomes easy.

  Next, a method for using the algae-proof membrane will be described with reference to FIGS. Here, FIG. 3 is an explanatory view showing a state in which the algae-proof membrane 2 is disposed in the catchment channel 1, and FIG. 4 is an explanatory view showing a state of the algae-proof membrane 2 when the water 4 is filled in the catchment channel 1. .

First, a sheet-shaped algae-proof membrane (product of the present invention) 2 having the above-described configuration having a width equal to the length of both flange portions, both side inner surface portions and bottom inner surface portions of the water collecting channel 1 is manufactured, and then The product of the present invention is cut to the length of the water collecting channel 1 to be constructed. Subsequently, as shown in FIG. 3, the algae-proof membrane 2 is fixed not to the side inner surface and the bottom surface of the water collecting channel 1 but only to the flange portions at both ends, for example, with screws 3 or the like. Next, when water 4 from the final settling basin is introduced into the catchment channel 1 as shown in FIG. 4, the algal barrier 2 is automatically applied to the inner surface of the catchment channel 1 by the weight of the water 4 from the final settling basin. A surface is formed which prevents the generation and attachment of algae.
In addition, when using an algae-proof board, although not shown in figure, what is necessary is just to arrange | position similarly to the case where the algae-proof film | membrane of FIG.

  Examples of the fluororesin used in the present invention include, but are not limited to, PTFE resin, FEP resin, and PFA resin. Here, PTFE resin with the most abundant types of commercially available dispersions used in a coating method in which an aqueous dispersion is impregnated, dried and baked into a glass fiber woven fabric, which is the most common method for obtaining the material having the above-mentioned constitution, is suitable. Used for. Of course, it goes without saying that the material having the above-described configuration may be manufactured by other methods, for example, a method of laminating a fluororesin film and a glass fiber woven fabric.

  3) The algae-proof membrane according to the present invention having a fluororesin layer containing carbon contains carbon in the dispersion instead of the fluororesin simple aqueous dispersion in the case of the algae-proof membrane of 2) above. It is obtained by impregnating, drying and firing the glass fiber woven fabric. In this case, examples of usable carbon include carbon black and graphite. Moreover, the ratio of the carbon with respect to a fluororesin should just be 2 weight% or more. When the algae-proof membrane is applied to a water collection channel, in addition to the effect of the above-mentioned 2) algae-proof membrane, the hue is black and has a light-shielding property, so that the generation of algae in the channel is suppressed. .

  4) The algae-proofing membrane of the present invention having a fluororesin layer containing titanium oxide photocatalyst particles is the only outermost layer (final coating) in the above-mentioned 2) algae-proofing membrane aqueous dispersion. Instead, the glass fiber woven fabric is impregnated, dried and fired with a liquid containing titanium oxide photocatalyst particles in the dispersion. In this case, examples of usable titanium oxide photocatalyst fine particles include various photocatalytic titanium oxide fine particles such as anatase type, rutile type, and hydrous type. From the viewpoint of photoactivity, anatase type photocatalyst titanium oxide fine particles are used. Is preferred. Moreover, it is preferable that the average particle diameter of a photocatalytic titanium oxide particle exists in the range of 0.007-0.5 micrometer. This indicates that when the average particle diameter of the photocatalytic titanium oxide fine particles is smaller than 0.007 μm, it is difficult to sufficiently expose the fine particles to the surface of the fluororesin layer, and when the particle diameter is larger than 0.5 μm, the specific surface area is increased. This is because the photocatalytic effect tends to decrease due to the decrease.

  The blending amount of the photocatalytic titanium oxide fine particles and the fluororesin is a weight ratio (photocatalytic titanium oxide fine particles: fluororesin) from the viewpoint of exposure of the photocatalytic titanium oxide fine particles to the surface of the layer and adhesion to the lower water-repellent resin layer. In general, the ratio is 1: 9 to 6: 4, preferably 3: 7 to 5: 5. If the blending amount of the photocatalytic titanium oxide fine particles is increased beyond this range, the adhesion to the lower fluororesin layer tends to decrease. Moreover, when it decreases, it will become difficult to fully expose photocatalyst titanium oxide microparticles | fine-particles on the layer surface. When the algae-proof membrane is applied to a water collection channel, in addition to the effect of the algae-proof membrane described in 2) above, the photocatalytic action of the titanium oxide photocatalyst particles decomposes the attached algae spores to prevent the generation of algae. There is an effect to prevent.

  5) Algae-proof membrane according to the present invention having a fluororesin layer containing an antibacterial agent is the outermost layer (final coating) only 2) In place of the fluororesin simple aqueous dispersion in the case of the algae-proof membrane The glass fiber woven fabric is impregnated, dried and fired with a liquid containing an antibacterial agent in the dispersion. In this case, examples of usable antibacterial agents include heat-resistant thiazolylsulfamide compounds, silver-based and copper-based compounds. The ratio of the antibacterial agent to the fluororesin is preferably 0.1 to 5% by weight. When the algae-proof membrane is applied to a water collection channel, in addition to the effect of the algae-proof membrane of claim 4, the generation of algae is suppressed by the bactericidal and antibacterial action of the antibacterial agent.

  6) The second algae-proof membrane according to the present invention is composed of a film or sheet of a fluororesin alone in an algae-proof membrane used by being disposed at least inside the final sedimentation basin or catchment channel of a sewage treatment facility. Is done. Also in this anti-algal membrane, the film or sheet can contain carbon, titanium oxide photocatalyst particles or an antibacterial agent as a filler. In the case of PTFE resin, the algae-proof membrane is preferably a skived film or sheet produced by a so-called “skiving method” in which a cylindrical PTFE resin molded product is produced and peeled off. In the case of a molten type fluororesin such as FEP resin or PFA resin, a film or sheet produced by extrusion molding or blow molding is preferably used. In this case, the thickness of the film or sheet is preferably 0.25 mm to 1 mm. Here, if the thickness is less than 0.25 mm, there is a problem in durability for use, and if the thickness exceeds 1 mm, the weight becomes excessive. When the algae-proof membrane according to claim 8 is applied to a water collecting channel, it is difficult to attach even if algae are generated because the surface is a fluororesin as in claim 4, and can be easily removed. Cleaning work becomes easy.

  7) The first algae-proof overflow plate according to the present invention is an algae-proof overflow plate used by being disposed at the upper end of a final sedimentation basin or a water collection channel of a sewage treatment facility. The laminated body which has at least one sheet | seat comprised with the fluororesin layer which coat | covers the both surfaces side of this glass fiber woven fabric, and the copper foil or silver foil laminated | stacked on both surfaces side of this laminated body are comprised.

  FIG. 6 shows an example of the algae-proof overflow plate. That is, this algae-proof overflow plate is made of copper foil on the outer surface side of a fluororesin-coated glass fiber woven fabric laminate 31 which is a laminate obtained by laminating the materials shown in FIG. This is a material obtained by thermally fusing 33. Here, instead of the laminate 31, an algae-proof overflow plate using a laminate containing carbon, titanium oxide photocatalyst particles or an antibacterial agent as a filler can be used.

  The algae-proof overflow plate is used as shown in FIGS. Here, FIG. 5 (A) shows the arrangement state of the algae-proof overflow plate used in the overflow section between the final sedimentation basin and the catchment channel of the sewage treatment facility, and FIG. 5 (B) shows the algae-proof property. A plan view of the overflow plate is shown. In FIG. 5, the sewage-treated water overflows the overflow plate 22 from the final sedimentation basin 24 through the valley portion 22a of the overflow plate 22 shown in FIG. In this case, by configuring the overflow plate 22 with the above-described materials, the action of suppressing the generation of algae that copper has, the non-adhesiveness of the fluororesin layer, and the action of each filler contained in the fluororesin layer. Algae generation near the overflow plate can be suppressed. Moreover, even if algae are generated, at least the glass fiber woven fabric used as the material for the algae-proof overflow plate of the present invention, carbon contained in the fluororesin, titanium oxide photocatalyst fine particles, antibacterial agent The same fillers as those described above with respect to the algae-proofing membrane materials 2) to 6) can be used as the filler, and the fluororesin film or sheet.

  8) Another algae-proof overflow plate according to the present invention is an algae-proof membrane used by being disposed at the upper end of a final sedimentation basin or a water collection channel of a sewage treatment facility, A copper foil is provided on both sides of the film or sheet.

  As the copper foil, a rolled copper foil or an electrolytic copper foil having a thickness of 18 μm to 2 mm is used. A PFA resin film or an FEP film is preferably used as the melting type fluororesin film for heat-sealing the fluororesin layer and the copper foil.

  In addition, the laminated board made of the material excluding the copper foil from the structure of the algae-proof overflow plate can also be used as an effective algae-proof overflow plate material because the adhesion of the algae is prevented by the non-adhesiveness of the fluororesin. Needless to say.

Hereinafter, Examples 1 to 13 and Comparative Examples 1 to 3 of the present invention will be described.
Example 1
An ETFE film 43 having a thickness of 100 μm as a fluororesin layer was formed on a substrate 41 made of SUS304 having a thickness of 300 μm via an adhesive layer 42 having a thickness of 50 μm, and this was used as an anti-algae plate of Example 1. . Here, as the adhesive layer, a silicone adhesive (trade name: SD-4570) manufactured by Toray Dow Corning Silicone Co., Ltd. was used. As the ETFE film, trade name: Aflon COP film manufactured by Asahi Glass Co., Ltd. was used.
The algae-proof plate used in Example 1 had the highest surface smoothness, and the drainage channel algae-proof property, that is, the removal of algae was the most excellent.

(Example 2)
A 100 μm-thick film as a fluororesin layer was formed on a 300 μm-thick SUS304 substrate through a 50 μm-thick adhesive layer, and this was used as an anti-algae plate of Example 2. Here, the film is obtained by mixing 20% by weight of photocatalytic titanium oxide particles (trade name: ST-41, manufactured by Ishihara Sangyo Co., Ltd.) with ETFE resin and mixing them into a film. As the adhesive layer, a silicone adhesive (trade name: SD-4570) manufactured by Toray Dow Corning Silicone Co., Ltd. was used. As the ETFE resin, trade name: Fullon ETFE C55P manufactured by Asahi Glass Co., Ltd. was used.
According to Example 2, the same effect as Example 1 was acquired. In addition, although the algal barrier plate according to Example 2 is not illustrated, the basic configuration is the same as that in FIG.

(Example 3)
A film having a thickness of 100 μm as a fluororesin layer was formed on a substrate made of SUS304 having a thickness of 300 μm via an adhesive layer having a thickness of 50 μm, and this was used as an anti-algae plate of Example 3. Here, the film is a ETFE resin containing 1% by weight of a thiazolylsulfamide compound antibacterial agent (trade name: KB9, manufactured by Taimeitec Co., Ltd.) and mixed sufficiently to form a film. is there. As the adhesive layer, a silicone adhesive (trade name: SD-4570) manufactured by Toray Dow Corning Silicone Co., Ltd. was used. As the ETFE resin, trade name: Fullon ETFE C55P manufactured by Asahi Glass Co., Ltd. was used.
According to Example 3, the same effect as in Example 1 was obtained. In addition, although the algal barrier plate according to Example 3 is not illustrated, the basic configuration is the same as FIG.

(Examples 4 to 6)
100 μm thick ETFE film (trade name: NF100NJ, manufactured by Daikin Industries, Ltd.), 100 μm thick PFA film (trade name: AF-0100, manufactured by Asahi Glass Co., Ltd.), 100 μm thick FEP film (trade name: NF-) 0100, manufactured by Daikin Industries, Ltd.) were cut into a width of 1000 mm and a length of 5000 mm, respectively, and these were designated as Examples 4, 5, and 6, respectively.

  The films used in Examples 4 to 6 had the highest surface smoothness, and the drainage algae-proofing property, that is, the removal of algae was the most excellent.

(Example 7)
PTFE powder (trade name: 7A-J, manufactured by Mitsui Dupont Fluorochemical Co., Ltd.) was compressed into a cylindrical shape with a press (molding pressure 18 MPa, 30 minutes) and fired (molding temperature 370 ° C., 48 hours). It was cut into a 0.5 mm thick ETFE film (width 1000 mm × length 5000 mm) as an algae-proofing membrane by the skiving method.

(Example 8)
Glass cloth (trade name: WE-128, manufactured by Nittobo Co., Ltd.) is impregnated with a 50% by weight resin-containing diluted dispersion of PTFE resin dispersion (trade name: T-30J, manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) By repeating the steps of drying and firing, a PTFE-coated glass cloth material (resin layer thickness 0.02 mm, total thickness 0.3 mm) having a PTFE resin content of 60% by weight was obtained.

(Examples 9 and 10)
Under the same conditions as in Example 8, a PFA-coated glass cloth was manufactured using PFA resin dispersion (trade name: T-334J, manufactured by Mitsui DuPont Fluorochemical Co., Ltd.). 02 mm, total thickness 0.3 mm), FEP-coated glass cloth manufactured using FEP resin dispersion (trade name: T-120J, manufactured by Mitsui DuPont Fluorochemical Co., Ltd.) was used in Example 10 (resin layer thickness 0). 0.02 mm, total thickness 0.3 mm).

(Example 11)
Instead of the 50 wt% PTFE resin diluted dispersion of Example 8, a dispersion containing 4 wt% of carbon black (trade name: Toka Black # 4500 manufactured by Tokai Carbon Co., Ltd.) with respect to the PTFE resin weight was used. A carbon-containing PTFE resin-coated glass cloth material was obtained in the same manner as in Example 8 (resin layer thickness 0.02 mm, total thickness 0.4 mm).

(Example 12)
First, a glass cloth (trade name: WE-128, manufactured by Nitto Boseki Co., Ltd.) and a PTFE resin dispersion (trade name: T-30J, manufactured by Mitsui Dubon Fluoro Chemical Co., Ltd.), a 50% by weight resin-containing diluted disperse. By repeating the steps of impregnating, drying and firing John, a PTFE-coated glass cloth material having a PTFE resin content of 50% by weight was obtained. Next, 50 wt% of PTFE resin containing 20 wt% of photocatalytic titanium oxide fine particles (trade name: ST-41 manufactured by Ishihara Sangyo Co., Ltd.) on the surface of the coated glass cloth material of 50 wt% of PTFE resin. The process of applying, drying and firing the% -containing disversion was repeated. Finally, a PTFE-coated glass cloth material (resin layer thickness 0.02 mm, total thickness 0.3 mm) having a PTFE resin content of 60% by weight having a layer containing photocatalytic titanium oxide fine particles on the surface was obtained.

(Example 13)
Disperser containing 1% by weight of a thiazolylsulfamide compound antibacterial agent (trade name: KB9 manufactured by Taimeitec Co., Ltd.) based on the weight of the PTFE resin instead of the 50% by weight PTFE resin diluted disversion of Example 8 A carbon-containing PTFE resin-coated glass cloth material (resin layer thickness 0.02 mm, total thickness 0.3 mm) was obtained in the same manner except that John was used.

(Comparative Example 1)
A glass fiber reinforced unsaturated polyester resin sheet (0.5 mm thickness × 100 mm width × 1000 mm length) was obtained, and this was used as the algal barrier film of Comparative Example 1.

(Comparative Example 2)
A stainless steel plate (SUS304, 0.5 mm thickness × 100 mm width × 1000 mm length) was obtained, and this was used as the algal barrier film of Comparative Example 2.

(Comparative Example 3)
The concrete water collecting channel itself (inner dimensions 540 mm height × 400 mm width × 3000 mm length) was used as the algal barrier film of Comparative Example 3.

The materials obtained in the above Examples 1 to 13 are actually attached to the water collecting channel as shown in FIG. 2 of the sewage treatment plant (Koufu City Sewerage Purification Center, Yamanashi Prefecture). It placed adjacent to the water channel to which the materials 1 to 13 were attached, and the adhesion state of the algae after one month and the ease of removing the attached algae were confirmed. The results are shown in Tables 1 to 3 below. However, Tables 1-3 show the algae generation / removal status after 7 days, 50 days, and 90 days, respectively.

  From Tables 1 to 3, the following was found. That is, in Examples 1 to 7, no difference was found in the state of adhesion, ease of removal, and cleaning time from the initial evaluation to the completion of evaluation. Also, no damage such as scratches was found on the film surface. In the case of Examples 8 to 11, generation of algae is observed in the uneven portion of the glass cloth from the initial evaluation stage. Moreover, although it wash | cleaned using the deck brush, it was not able to remove completely at the end of evaluation. In the case of Examples 12 and 13, generation of bearded and mossy algae was observed from the initial stage of evaluation. In addition, scratches were generated on the resin layer surface.

  In addition, in the said Examples 1-13, although the algae-proof board or the algae-proof membrane was described about the case where it arrange | positions to the inner side of a water collection channel and the flange part 1a as shown in FIG.3 and FIG.4, it is not restricted to this. The algae-proof plate or the algae-proof membrane may be disposed at least inside the water collecting channel.

  Next, Examples 14 to 19 and Comparative Examples 4 and 5 of the present invention will be described.

(Example 14)
10 material PTFE-coated glass cloth materials produced in Example 8 and 2 oz copper foil (trade name: electrolytic copper foil manufactured by Fukuda Metal Foil Powder Co., Ltd.) having a thickness of 0.7 mm disposed above and below the material. The laminate material laminated between the hot press board surfaces was prepared, and an anti-algae overflow plate (size thickness about 2 mm × width 600 mm × length 2900 mm) shown in FIG. 5B was produced.

(Example 15)
An algae-proof overflow plate was produced under the same conditions as in Example 14 except that a silver foil having a thickness of 0.28 mm was used instead of the copper foil, and Example 15 was designated as Example 15.

(Example 16)
Heating in a state where 10 pieces of the carbon-containing PTFE resin-coated glass cloth material produced in Example 11 and 2 ounce copper foil (trade name: electrolytic copper foil manufactured by Fukuda Metal Foil Powder Co., Ltd.) are arranged above and below it A laminate material laminated between the press panels was prepared, and an anti-algae overflow plate (size thickness about 2 mm × width 600 mm × length 2900 mm) shown in FIG. 5B was produced.

(Example 17)
Ten PTFE resin-coated glass cloth materials having a photocatalytic titanium oxide layer on the surface of the material produced in Example 12 and 0.7 oz. Thickness of 2 oz copper foil (trade name, manufactured by Fukuda Metal Foil Powder Industry Co., Ltd.) : Electrolytic copper foil) is placed in a state where the laminate material is laminated between the surfaces of the hot press board, and the algae-proof overflow plate having the shape shown in FIG. 5B (size thickness about 2 mm × width 600 mm × 2900 mm in length) was produced.

(Example 18)
10 pieces of the antibacterial agent-containing PTFE resin-coated glass cloth material produced in Example 13 and a 2 ounce copper foil having a thickness of 0.7 mm above and below it (trade name: electrolytic copper foil manufactured by Fukuda Metal Foil Powder Co., Ltd.) A laminated material laminated between the surfaces of the heating press board in a state where is placed, and an algae-proof overflow plate (size thickness about 2 mm × width 600 mm × length 2900 mm) shown in FIG. Produced.

(Example 19)
First, PTFE powder (trade name: M-391S, manufactured by Asahi Glass Co., Ltd.) was compression-molded (molding pressure: 18 MPa, 10 minutes) and fired (firing temperature: 370 ° C., 48 hours) with a thickness of 5 mm. A PTFE sheet was obtained. Next, 2 ounce copper foil (trade name: electrolytic copper foil, Fukuda Metal Foil Powder Co., Ltd.) having a thickness of 0.7 mm is arranged on both sides of the PTFE sheet, and hot pressing (320 ° C., 1 hour) is performed. An anti-algae overflow plate (thickness 5 mm × width 250 mm × length 2900 mm) was produced.

  Since the copper foil of Example 19 is excellent in the surface smoothness of the PTFE sheet existing in the PTFE sheet existing in the lower layer even when copper is ionized and flows out into the final sedimentation place, the algae removability is It does not decline.

(Comparative Example 4)
An overflow plate (size thickness about 4 mm × width 250 mm × length 2900 mm) having the same shape as that shown in FIG. 5 (B) was produced from a glass fiber reinforced unsaturated polyester resin sheet.

(Comparative Example 5)
An overflow plate (size thickness about 1 mm × width 250 mm × length 2000 mm) having the same shape as that shown in FIG. 5B was made of a stainless steel plate (SUS304).

The overflow plate produced in Examples 14 to 19 and Comparative Examples 4 and 5 above was actually attached to the overflow section of a sewage treatment plant (Koufu City Sewerage Purification Center, Yamanashi Prefecture), and the state of algae after one month And the ease of removal of attached algae was confirmed. The results are shown in Tables 4 to 6 below. However, Tables 4 to 6 show the generation / removal status of algae after 7 days, 50 days, and 90 days, respectively.

From the above Tables 4 to 6, the following was found.
That is, in Examples 14 to 19, no generation of beard-like algae was observed from the initial evaluation to the completion of the evaluation. Moreover, the occurrence of mossy algae was observed until the end of the evaluation. Furthermore, the thickness (single side) of the copper foil was as thin as 0.7 mm to 0.6 mm.

  In the said Examples 14-19, as shown in FIG. 5, although the case where it arrange | positioned to the outer side (final sedimentation basin side) of a water collection channel was described, you may arrange | position not only to this but inside a water collection channel.

  Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. Further, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiment. For example, some components may be deleted from all the components shown in the embodiment. Furthermore, you may combine suitably the component covering different embodiment.

Sectional drawing of the algal barrier board which concerns on this invention. Sectional drawing of the algal barrier membrane which concerns on this invention. Explanatory drawing of the water collection channel which installed the algaeproof membrane which concerns on this invention. Explanatory drawing of the state which filled the water collection channel of FIG. 3 with water. Explanatory drawing of the water collection channel which installed the algae-proof overflow board which concerns on this invention. Sectional drawing of the algae-proof overflow plate used for the overflow part of the catchment channel of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Glass fiber woven fabric, 12 ... Fluororesin layer, 1,21 ... Catchment channel, 2 ... Algae-proof membrane, 3,23 ... Screw, 4,25 ... Water, 22 ... Algae-proof overflow plate, 24 ... Final sedimentation place 31 ... Fluororesin-coated glass fiber woven laminate, 32 ... Fluororesin film, 33 ... Copper foil, 41 ... Substrate, 42 ... Adhesive layer, 43 ... Fluororesin layer.

Claims (15)

An anti-algal plate used by being disposed at least inside a final sedimentation basin or a water collection channel of a sewage treatment facility, comprising a substrate and a fluororesin layer formed on at least one surface of the substrate. Algal plate. The algae-proof plate according to claim 1, wherein the substrate is made of any one of metal, ceramics, and resin. The algae-proof plate according to claim 1, wherein the fluororesin layer is a layer made of a melt-type fluororesin. The algae-proofing film according to claim 3, wherein the fluororesin layer contains titanium oxide photocatalyst particles. 4. The algae-proof membrane according to claim 3, wherein the fluororesin layer contains an antibacterial agent. In an anti-algal membrane used at least inside the final sedimentation basin or catchment channel of a sewage treatment facility, it comprises a glass fiber woven fabric and a fluororesin layer that covers both sides of the glass fiber woven fabric. A characteristic algal barrier membrane. The algae-proofing membrane according to claim 6, wherein the fluororesin layer is a layer made of a melt-type fluororesin. The algal barrier film according to claim 6, wherein the fluororesin layer contains titanium oxide photocatalyst particles. The algae-proof membrane according to claim 6, wherein the fluororesin layer contains an antibacterial agent. An algae-proof membrane that is used at least inside a final sedimentation basin or a water collection channel of a sewage treatment facility, and is composed of a fluororesin single film or sheet. Containing a glass fiber woven fabric and a fluororesin layer covering both sides of the glass fiber woven fabric in an algae-proof overflow plate used at the upper end of the final sedimentation basin or catchment channel of a sewage treatment facility An anti-algae overflow plate comprising: a laminate having at least one sheet to be formed; and a copper foil or a silver foil laminated on both sides of the laminate. The algae-proof overflow plate according to claim 11, wherein the fluororesin layer is a layer made of a melt-type fluororesin. The algae-proof overflow plate according to claim 11, wherein the fluororesin layer contains titanium oxide photocatalyst particles. The algae-proof overflow plate according to claim 11, wherein the fluororesin layer contains an antibacterial agent. In the algae-proof overflow plate used by being disposed at the upper end of the final sedimentation basin or catchment channel of the sewage treatment facility, the fluororesin single film or sheet, and the copper foil disposed on both sides of the film or sheet, An algae-proof overflow plate comprising silver foil.

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