JP2001187302A - Sedimentation equipment, inclined sedimentation promoting body and biofouling prevention gel coat - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a precipitation apparatus that suppresses or kills algae and bacteria in treated water and does not contain harmful substances in treated water. SOLUTION: The sedimentation device includes a sedimentation tank 1 and an inclined plate 2 (inclined sedimentation promoting body) disposed in the sedimentation tank 1. The inclined plate 2 is made of FRP, and a bioadhesion preventing gel coat containing an Ag-based antibacterial agent is formed on the surface of the inclined plate 2 made of FRP. [Effect] The surface of the inclined plate 2 is smoothed by the FRP and the gel coat of its surface layer, the surface particle size is small, and the SS component which has reached the surface is slid down. Prevention of drop and clogging of gaps. Ag has a strong bactericidal property, and suppresses or kills the generation of algae and bacteria due to irradiation with light such as sunlight, thereby preventing deterioration of treated water quality.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sedimentation apparatus for performing a solid-liquid separation operation in various treatments such as clean water, industrial water, sewage, human waste, and industrial wastewater, and is disposed in a sedimentation tank of the sedimentation apparatus. The present invention relates to an inclined sedimentation promoting body and a gel coating for preventing biofouling formed on the surface of the inclined sedimentation promoting body.

[0002]

2. Description of the Related Art Conventionally, as a sedimentation apparatus used in various water treatments, a large number of inclined sedimentation promoting bodies such as inclined plates or inclined pipes are arranged in a tank as disclosed in Japanese Patent Application Laid-Open No. 4-338202. A sedimentation basin with an increased sedimentation area, improved sedimentation efficiency, improved flow conditions, and a SS sedimentation promoting function to improve treatment efficiency is used (hereinafter referred to as “prior art 1”). .

[0003] However, although there is a remarkable effect of promoting the sedimentation of SS by the inclined plate or the inclined pipe, it is not easy to drop the sludge settled and deposited on the inclined surface downward.
There is a drawback that the quality of the treated water deteriorates due to the clogging of the gap between the inclined plates and the decay of the deposited sludge due to the deposited sludge. The equipment and labor required for the periodic cleaning operation of the deposited sludge accompanying these drawbacks are large, and the tendency is particularly remarkable in an activated sludge settling apparatus.

[0004] Another major disadvantage is that algae and bacteria are generated and propagated. Regardless of the presence or absence of sunlight, these algae and bacteria are generated and propagate near the inclined plate surface and on the back surface when the water temperature is moderate, impairing the SS sedimentation function, and deteriorating water treatment water quality and efficiency. In order to remove such algae and other obstacles, it is temporarily effective to provide a cover that blocks sunlight irradiation.However, considering the long-term use, the provision of a cover will greatly increase equipment costs. In addition, maintenance of the sedimentation equipment becomes difficult.

[0005] Also, the inflowing raw water is periodically subjected to means such as heat sterilization, ultraviolet sterilization, ultrasonic cell destruction, electric sterilization, gas sterilization, high magnetic field sterilization, and chemical sterilization using a halogen-based surfactant, and the like. And the generation of bacteria can be suppressed or killed, but the equipment for implementing these is large-scale, and depending on the use of the treated water, the sterilization method is limited.

[0006]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the above-mentioned conventional sedimentation apparatus, to suppress or eliminate the occurrence of algae and bacteria in water and to prevent harmful substances from being contained in treated water. Therefore, the sedimentation device having an economical sedimentation function capable of further improving the sedimentation promoting effect without being limited by the use of the treated water, the inclined sedimentation promoting body used therein, and the surface formed on the surface thereof It is an object of the present invention to provide a biofouling prevention gel coat.

[0007]

According to the first aspect of the present invention,
In a sedimentation apparatus including a sedimentation tank and an inclined sedimentation promoting body disposed in the sedimentation tank, the inclined sedimentation promoting body is FR
P, which is characterized in that a biofouling-preventing gel coat is formed on the surface of the FRP inclined sedimentation promoting body.

According to a second aspect of the present invention, in the first aspect of the invention, the biofouling-preventing gel coat contains Ag.

According to a third aspect of the present invention, there is provided an inclined sedimentation promoting body provided in a sedimentation tank of a sedimentation apparatus, wherein the inclined sedimentation promoting body is made of FRP. It is characterized in that a biofouling prevention gel coat containing Ag is formed on the surface.

According to a fourth aspect of the present invention, there is provided a biofouling-preventing gel coat formed on the surface of an FRP slanted sedimentation promoting body disposed in a sedimentation tank of a precipitating apparatus, wherein the biofouling-preventing gel coat comprises Ag. It is characterized by containing.

[0011] The present invention provides a sedimentation apparatus in which an inclined sedimentation promoting body is provided in a sedimentation tank, wherein the inclined sedimentation promoting body is made of FRP and the surface thereof is smoothed to prevent biological adhesion on the surface of the FRP made inclined sedimentation promoting body. A gel coat is formed to further smooth and remove surface impurities at the same time, and silver (Ag) having an antibacterial action contained in the gel coat prevents the sludge from adhering by smoothing and ordering the surface of the gradient settling accelerator. In addition, it has a structure having both a sedimentation promoting action and an antibacterial property that suppresses or kills the generation and reproduction of organisms and bacteria such as algae by the action of Ag.

The surface of the inclined sedimentation promoting body is sufficiently smoothed by the FRP and the gel coat as its surface layer, and the surface roughness is small, so that the SS component reaching the surface is easily slid off, and the excellent sedimentation promoting body is obtained. Has functions. In addition, sludge is not easily adhered, and it is possible to prevent the sedimentation of the sludge from lowering the sedimentation efficiency and closing the gap. FRP can smoothen and order the surface irrespective of the shape of the inclined sedimentation promoting body, and is preferable as a base material of the inclined sedimentation promoting body.

Ag, an antibacterial agent, has been used for a long time as a material having strong bactericidal properties for preventing decay of drinking water, medical products and dental materials, and generating algae and bacteria by irradiation with light such as sunlight. Has the effect of suppressing or killing water and preventing deterioration of treated water quality.

According to the sedimentation apparatus of the present invention having the above-mentioned structure, the treated water is used because of the action of suppressing the adhesion of sludge by smoothing the surface of the inclined sedimentation promoting body and the antibacterial property of the safe Ag contained in the gel coat. It can be applied without any choice and can be used both indoors and outdoors.

[0015]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially omitted longitudinal sectional view showing a precipitation apparatus according to an embodiment of the present invention, and FIG. 2 is a transverse sectional view of an inclined plate.

As shown in FIG. 1, the sedimentation apparatus of the present invention is an inclined plate sedimentation apparatus including a sedimentation tank 1 and an inclined plate 2 (inclined sedimentation promoting body) disposed in the sedimentation tank 1. A mesh-like support frame 5 for mounting the inclined plate 2 on a suspending rod 4 attached to the gantry 3 is suspended in the sedimentation tank 1 via a suspension angle, and the inclined plate 2 is Are supported in an inclined manner, and both ends and the upper and lower sides of the inclined plate 2 are supported by a support frame 5. 8 indicates a water surface. FIG. 1 shows only one side, and there is a similar support frame 5 on the back side, to which the inclined plate 2 is fixed.

Hereinafter, the inclined sedimentation promoting body of the present invention will be described.

As shown in FIG. 2, the inclined plate 2 is composed of a laminate 2a made of FRP and a gel gel 2b for preventing biofouling formed on the surface of the laminate 2a. 3 and 4
Fig. 3 is a view showing another embodiment of the inclined settling promoting body of the present invention, Fig. 3 is a perspective view showing a part of a finned inclined plate, and Fig. 4 is a part of a honeycomb-shaped inclined pipe. It is a perspective view. The FRP finned inclined plate 6 shown in FIG. 3 and the FRP honeycomb inclined tube 7 shown in FIG.
Can be used instead of A biofouling preventing gel coat containing an antimicrobial agent is formed on the surface of the inclined plate 6 in FIG. 3 and on the inner surface of each inclined tube 7 in FIG. 4.

Next, the biofouling-preventing gel coat of the present invention formed on the surface of the FRP inclined sedimentation promoting body (inclined plate 2, finned inclined plate 6, honeycomb-shaped inclined tube 7) will be described.

In a FRP molded product obtained by curing at room temperature, a colored resin layer generally called "gel coat" having both "aesthetic appearance" and "protection effect" is formed. The components of the gel coat used in the present invention and the compounding ratio thereof are as follows.

Unsaturated polyester resin: There are various types of unsaturated polyester resins used as the gel coat base resin, but resins shown in Table 1 are preferably used. The content of the unsaturated polyester resin is 50 to 55%.
(Wt.%, The same applies hereinafter). In Table 1, iso-type: isophthalic acid type, ortho-type: ortho-phthalic acid type,
Iso-NPG type: isophthalic acid-neopentyl alcohol type, His type: bisphenol type, reaction type: flame retardant resin containing a combustion inhibiting effect reaction aid, addition type: flame retardant resin containing a combustion inhibiting effect additive It is a display.

[0023]

[Table 1]

Color pigment: The content of the color pigment is from 1 to
3% is preferred.

Filler: Titanium oxide, silicon dioxide or the like is used as a filler. The content of the filler is 40 to 4
5% is preferred.

Other additives: The additives include a curing agent (organic peroxide), a curing accelerator (cobalt naphthenate) and the like. The content of the additive is preferably 0.5 to 1%.

The numerical values (%) of the above contents are those in the gel coat (the above).

Antibacterial agent: The antibacterial agent is a silver (Ag) -based antibacterial agent that uses calcium phosphate as a carrier and carries silver (Ag).

The content of Ag in the antibacterial agent is 0.5 to 3.0.
%. In particular, 2.5% is preferable.

The antibacterial agent in the biofouling-preventing gel coat (gel coat and antibacterial agent: above) has a lower limit of 0.5% when used at room temperature, and the antibacterial effect is sufficient. If it is less than 0.5%, the antibacterial effect is insufficient. On the other hand, even if the content exceeds 1.0%, the antibacterial effect is saturated.
Therefore, the content of the antibacterial agent is preferably 0.5 to 1.0%.

The thickness of the gel coat formed on the surface of the inclined settling accelerator is targeted at 0.5 mm. If it is less than 0.3 mm, the smoothness of the surface is reduced due to aging wear. 0.7
Even if it exceeds mm, the antibacterial effect is saturated. Therefore, the gel coat thickness is preferably from 0.3 to 0.7 mm.

As a means for forming a gel coat, first, a gel coat is applied to a mold to a required thickness, and the coated gel coat is once cured, and then laminated to a required thickness with glass fibers and a resin. When the mold is removed, an FRP molded product having the gel coat as a surface layer (the inclined sedimentation promoting body of the present invention) is obtained.

As a means for forming a gel coat, a method of post-coating of a molded article is not used.

[0034]

Next, an embodiment of the present invention will be described.

Example 1 As an unsaturated polyester resin of a gel coat base resin, an isophthalic acid-based resin having excellent weather resistance and water resistance shown in the column of “General-purpose gel coat” in Table 1 was used, and a coloring pigment and a filler were used. And an additive at the compounding ratio shown below, and further, an anti-biofouling gel coat containing an Ag-based antibacterial agent at the compounding ratio shown below is formed on the surface of the FRP base material, and the surface is sufficiently formed. Specimens (hereinafter referred to as "specimens of the present invention") were prepared.

Unsaturated polyester resin: (isophthalic acid) 53% Color pigment: 1% Filler (titanium oxide, silicon dioxide): 45% Additive: (curing agent: cobalt naphthenate) 0.5% It is the content in gel coat (~).

Antimicrobial Agent (Silver Antimicrobial Agent Using Calcium Phosphate as Carrier: 1.0%) The antimicrobial agent content is the content of the antimicrobial agent in the biofouling-preventing gel coat (gel coat + antimicrobial agent...). is there.

For comparison, a vinyl chloride plate which is a current inclined sedimentation promoting body, and a vinyl chloride plate having a surface made of an antifouling paint shown in Table 2 formed on the surface thereof (used for a weir or the like). ) Was used as a sample for comparison of the inclined settling accelerator.

The specimen of the present invention was immersed in an immersion tank in which sludge circulated from the final sedimentation basin of the sewage treatment plant was circulated for 60 days.
The generation of algae and the amount of attached sludge were tested. For comparison, the above test was also performed on a comparative sample under the same conditions as those of the sample of the present invention. Table 3 shows the test conditions and Table 4 shows the test results.
Shown in

In the column of immersion liquid in Table 3, SS: suspended substance amount, MLSS: suspended substance, MLVSS: organic suspended substance, SV: activated sludge settling rate, SVI: active capacity coefficient.

In Table 4, the evaluation of the amount of adhering sludge and the amount of adhering algae was indicated by a triangle (汚), and the sludge (algal) adhering surface area ratio: 10%
Hereinafter, the mark “△” is over 10 to less than 50%, and the mark “X” is 50.
% Or more.

As can be seen from Table 4, the sludge and algae specimens of the present invention on which the biofouling-preventing gel coat was formed had sludge-adhered surface area ratios and algae-adhered surface area ratios of both, which were compared with the comparative specimens. It can be seen that the amount of adhering is small.

[0043]

[Table 2]

[0044]

[Table 3]

[0045]

[Table 4]

Example 2 A test was conducted on the antibacterial property of the anti-biofouling gel coat of the present invention.

Specimens on which the anti-bioadhesive gel coat of the present invention containing an antimicrobial agent (hereinafter referred to as “Example gel coat”) and the gel coat containing no anti-microbial agent (hereinafter referred to as “Comparative gel coat”) were formed as follows: 1> to <3>
Prepared by the procedure of The components and the mixing ratio of the gel coat and the antibacterial agent were the same as in Example 1. <1> Methyl ethyl ketone peroxide (MEKPO) was applied to each of the gel coat of the example and the gel coat of the comparative example.
Add 1% of system hardener and add 0.5m to each glass plate
m thickness. Then, after heating at 50 ° C. for 30 minutes,
Allowed to cool. <2> Further, one ply of glass mat (1 ply: a unit representing the number of sheets) is lined with an iso resin,
After heating for 0 minutes, the mixture was allowed to cool. <3> Backing was performed with a one-ply glass mat using an ortho-based resin and allowed to stand overnight (standing time: about 12 hours). And after heating at 50 degreeC for 120 minutes, it demolded.

The following antibacterial tests were performed on the test samples of the gel coats of the examples and the comparative examples prepared as described above.

In the antibacterial test, 0.2 ml of a suspension of Escherichia coli and Staphylococcus aureus prepared in a 1 / 50-concentration ordinary broth medium was dropped onto the surface of the test specimen, and 2.5 cm from the top thereof.
It was wrapped with a polyethylene film of × 2.5 cm.
After the wrapped specimen was stored at a temperature of 35 ° C. for 24 hours, the viable cell count of the specimen was measured. The results are shown in Table 5.

As shown in Table 5, when the bacteria were left standing at a temperature of 35 ° C. for 24 hours at a temperature of 35 ° C., the specimens coated with the gel of the example had a bacterial count of less than 10 ^{2 for} both Escherichia coli and Staphylococcus aureus. It was confirmed that the anti-biofouling gel coat of the present invention containing an antibacterial agent had a good antibacterial action.

[0051]

[Table 5]

[0052]

As described above, the precipitating apparatus of the present invention has the following useful effects by providing the FRP-graded sedimentation accelerating body formed on the surface with the anti-bioadhesive gel coat containing Ag. It is. The generation of algae and bacteria can be suppressed or killed, and there is no need to worry about toxic substances flowing out into treated water due to the antibacterial property of safe Ag, and it can be used in any treated water. With the FRP base material and the gel coating for preventing biofouling, the slanted sedimentation promoting body can easily slide down the SS component due to the smooth surface, and the sedimentation promoting effect can be improved. The precipitation apparatus of the present invention can be used in a wide range both indoors and outdoors.

[Brief description of the drawings]

FIG. 1 is a partially omitted longitudinal sectional view showing a precipitation apparatus according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the inclined plate according to the embodiment of the present invention.

FIG. 3 is a perspective view showing a part of the finned inclined plate according to the embodiment of the present invention.

FIG. 4 is a perspective view showing a part of the honeycomb-shaped inclined tube according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sedimentation tank 2 Inclined plate 2a Laminate 2b Gel coat 3 Stand 4 Hanging rod 5 Support frame 6 Inclined plate with fins 7 Honeycomb-shaped inclined tube 8 Water surface

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Hirofumi Abe 1-2-1, Marunouchi, Chiyoda-ku, Tokyo Nihon Kokan Co., Ltd. (72) Inventor Hiroshi Yamamoto 4-3-1 Kudankita, Chiyoda-ku, Tokyo Adochemco Co., Ltd.

Claims (4)

[Claims] 1. A sedimentation apparatus comprising a sedimentation tank and an inclined sedimentation promoting body disposed in the sedimentation tank, wherein the inclined sedimentation promoting body is made of FRP, and a surface of the FRP inclined sedimentation promoting body. Wherein a gel coat for preventing biofouling is formed. 2. The sedimentation apparatus according to claim 1, wherein the biofouling prevention gel coat contains Ag. 3. An inclined sedimentation promoting body disposed in a sedimentation tank of a sedimentation apparatus, wherein the inclined sedimentation promoting body is made of FRP, and the surface of the FRP inclined sedimentation promoting body has A
An inclined sedimentation promoting body, wherein a bioadhesion-preventing gel coat containing g is formed. 4. An FRP disposed in a settling tank of a settling apparatus.
A biofouling-preventing gel coat formed on the surface of the slanted sedimentation promoting body, wherein the biofouling-preventing gel coat contains Ag.