JP7046025B2 - Water treatment equipment, cleaning methods and paints that facilitate the removal of adhered algae - Google Patents

Description

The present invention relates to a water treatment facility and a cleaning method for the water treatment facility, and more particularly to a water treatment facility and a cleaning method and a paint capable of easily performing water treatment or removal of algae adhering to the sludge treatment facility.

Conventionally, water treatment equipment for treating organic waste water and leachate has been made of iron, stainless steel, concrete, etc., and the iron parts are only coated with rust preventive paint, and the stainless steel parts and concrete parts are applied. In many cases, it is operated without painting.

For this reason, in equipment where an overflow wall is provided in the process of treating raw water such as organic wastewater, sludge, sewage, and leachate, the upper surface of the overflow wall is particularly installed outdoors. Algae adhered to the above, causing a decrease in the flow rate, which may lead to a decrease in operating efficiency. The attached algae grow longer and may grow thicker, and the growth rate varies depending on the type of algae, but many of them adhere to and adhere to the surface of the equipment, so it is necessary to remove them. It's not easy. At present, it can only be scraped off with a scaler or a leather ski, and it was a difficult situation including the stainless steel part and the concrete part.

Japanese Patent No. 3497576

As a method to solve such a problem, various removal tools have been improved, but it is not expected to significantly improve the work time or labor, but only a little improvement, and it is comprehensive including removability and maintainability. From the point of view that the cleaning work is reduced, it is still not enough.

In view of the above problems, the present invention has excellent algae removal property, can reduce the work load and damage to the equipment during the removal work, and can perform stable operation for a long period of time. Cleaning of water treatment equipment and water treatment equipment. Provide methods and paints.

As a result of diligent studies to solve the above problems, the present inventors have dramatically improved the algae removal property by applying a predetermined coating to the surface that is in contact with the liquid to be treated and to which algae can adhere to the surface. We found that it is improved, has excellent repeatability, can reduce the work load and equipment damage during removal work, and leads to shortening of equipment downtime, which enables stable equipment operation. The invention was completed.

The water treatment facility according to the embodiment of the present invention completed based on the above findings is, in one aspect, a sewage treatment plant and / or an industrial water supply and / or a urine treatment plant, and / or a final waste disposal site. And / or water treatment equipment including water treatment and / or sludge treatment equipment installed in general factories and incidental equipment such as their pipes, etc., on the surface where algae may adhere to the surface in contact with the liquid to be treated. The water treatment facility is provided with a coating having the following characteristics (1) to (4).
(1) The coating contains 1 to 90% by weight of silicone oil.
(2) The paraffin contact angle of the coating surface is 30 ° or more.
(3) The coefficient of dynamic friction due to the three-point steel ball on the coated surface is 0.15 or less.
(4) The thickness of the coating is 5 to 2000 μm.

In one embodiment of the water treatment equipment according to the embodiment of the present invention, the coating has an action of releasing the silicone oil into the liquid to be treated.

In another embodiment of the water treatment equipment according to the embodiment of the present invention, the coating contains a hydrolyzable silicone resin.

In another embodiment of the water treatment equipment according to the embodiment of the present invention, the coating is composed of two or more layers, and the coating of the first layer contains an epoxy resin.

The method for cleaning a water treatment facility according to an embodiment of the present invention is, in another aspect, a sewage treatment plant and / or an industrial water supply and / or a urine treatment plant, and / or a waste final disposal site, and / Or in water treatment equipment including water treatment and / or sludge treatment equipment installed in general factories and their ancillary equipment such as pipes, with respect to the surface where algae may adhere to the surface in contact with the liquid to be treated: Of a water treatment facility including a water treatment facility provided with a coating having the characteristics of (1) to (4), which comprises removing surface deposits containing algae adhering to the surface of the coating using a cleaning tool. It is a cleaning method.
(1) The coating contains 1 to 90% by weight of silicone oil.
(2) The paraffin contact angle of the coating surface is 30 ° or more.
(3) The coefficient of dynamic friction due to the three-point steel ball on the coated surface is 0.15 or less.
(4) The thickness of the coating is 5 to 2000 μm.

In one embodiment of the method for cleaning the water treatment equipment according to the embodiment of the present invention, after removing surface deposits, a coating having the above-mentioned characteristics (1) to (4) is applied to the surface in contact with the liquid to be treated. Including further placement.

The paint according to the embodiment of the present invention is installed in a sewage treatment plant and / or an industrial water supply and / or a sewage treatment plant, and / or a final waste disposal site, and / or a general factory in one aspect. Water treatment and / or sludge treatment equipment, and paints used in water treatment equipment including incidental equipment such as pipes, etc. It is a coating material for forming a coating having the characteristics of 1) to (4).
(1) The coating contains 1 to 90% by weight of silicone oil.
(2) The paraffin contact angle of the coating surface is 30 ° or more.
(3) The coefficient of dynamic friction due to the three-point steel ball on the coated surface is 0.15 or less.
(4) The thickness of the coating is 5 to 2000 μm.

According to the present invention, the water treatment equipment, the cleaning method and the paint of the water treatment equipment, which are excellent in the removal property of algae, can reduce the work load and the damage of the equipment during the removal work, and can operate stably for a long period of time. Can be provided.

Hereinafter, embodiments of the present invention will be described, but the embodiments shown below exemplify equipment and methods for embodying the technical idea of the present invention, and the technical idea of the present invention is the same. The structure, arrangement, etc. of the components are not specified to the following. In the embodiment of the present invention, "%" means% by weight unless otherwise specified.

The water treatment facility according to the embodiment of the present invention is water installed in a sewage treatment plant and / or an industrial water supply and / or a urine treatment plant, and / or a final waste disposal site, and / or a general factory. Includes treatment and / or sludge treatment equipment and incidental equipment such as their piping. In such a water treatment facility, a coating having the following characteristics (1) to (4) is arranged on a surface that is in contact with the liquid to be treated and to which algae can adhere to the surface.

"A surface that is in contact with the liquid to be treated and to which algae can adhere to the surface", that is, the surface to be coated to which the coating according to the embodiment of the present invention is applied includes iron, aluminum, stainless steel, titanium-copper alloy, zinc plating and the like. The metal material surface and its surface treated surface, the inorganic material surface such as concrete, mortar, and molded plate and its surface adjusting surface, and the old coated surface on these material surfaces can be included.

In this treatment method, (1) the coating contains 1 to 90% of silicone oil, (2) the paraffin contact angle of the coating surface is 30 ° or more, and (3) the coefficient of dynamic friction due to the three-point steel ball on the coating surface. Is 0.15 or less, and (4) forms a coating (A) having a coating thickness of 5 to 2000 μm.

The paint for forming such a coating (A) is not particularly limited as long as it satisfies the above conditions, and conventionally known undercoat paints and intermediate coat paints can be applied. For example, phthalic acid-based rust preventive paints, oil-based alkyd-based, phenol-alkyd-based, epoxy ester-based, one-component or two-component epoxyamine-based, polyurethane-based, rubber chloride-based rust preventive paints and primers are used on the metal surface. Can be mentioned.

On the surface of the inorganic material, for example, paints for sealers such as vinyl chloride, acrylic, epoxy, rubber chloride, urethane, and chlorinated resin, and base adjustment materials such as acrylic, urethane, and polymer cement. Further, there are examples of intermediate coating paints such as epoxy-based, acrylic-based, and urethane-based paints.

In reality, considering the durability of both the metal surface and the inorganic material surface in that the equipment environment of the surface to be coated is diverse and the surface to be coated is the wetted surface, any coating of the water treatment equipment can be applied. It is desirable to use an epoxy resin paint containing an epoxy resin as an undercoat (coating of the first layer) on the coated surface. Further, in an actual use environment, it is desirable to form a coating consisting of two or more layers, which is an optimum combination with an undercoat layer having an epoxy resin.

The coating (A) can be applied by a general method such as brush coating, spray coating, roller coating, iron coating, spatula coating, etc., and the amount of coating can be determined by the properties of the object to be coated and the surface to be coated. It can be appropriately selected depending on the area and the like.

There is no problem in applying the coating (A) again to the surface of the coating (A). However, since the film thickness at which the effect is exhibited is 5 μm to 2000 μm, it is preferable that the total film thickness when the coating (A) is applied again does not exceed 2000 μm.

The surface of the coating (A) The coating when the coating (A) is applied again can be performed by a general method such as brush coating, spray coating, roller coating, iron coating, spatula coating, etc., by applying the coating again. There are no particular restrictions. Further, the coating amount can be appropriately selected depending on the properties and area of the object to be coated and the surface to be coated.

The coating (A) arranged on the surface to be coated and in contact with the water to be treated in the water treatment equipment preferably has an action of releasing silicone oil into the liquid to be treated. As a result, the algae are prevented from sticking to the coated surface of the coating (A), and the surface deposits containing the algae are removed by using a scaler, a skin ski, a brush, a waste cloth, a sponge, a high-pressure water washer, or the like. Since it can be easily removed by the cleaning tool, the work load during the removal work can be reduced and the damage to the equipment can be reduced. It is more preferable that the coating (A) contains a hydrolyzable silicone resin.

(1) Silicone oil The coating contains 1 to 90% of silicone oil. Silicone oil is more preferably contained in an amount of 5 to 50%, still more preferably 10 to 30%.

(2) Paraffin contact angle The paraffin contact angle of the coating surface needs to be 30 ° or more, more preferably 45 ° or more, still more preferably 60 ° or more. When the paraffin contact angle of the coating surface is smaller than 30 °, contaminants such as inorganic scale may easily adhere. On the other hand, if the paraffin contact angle of the coating surface is too large, there may be a problem in the repairability (recoating property) of the coating film. The paraffin contact angle can be, for example, 80 ° or less, and further can be 70 ° or less. Here, the paraffin contact angle represents the result of measuring the static contact angle at room temperature using a simple contact angle meter.

(3) Dynamic friction coefficient If the dynamic friction coefficient of the three-point steel ball on the coated surface is too large, the ease of removal of the inorganic scale may decrease. Therefore, the dynamic friction coefficient is preferably 0.15 or less, preferably 0.10. The following is even more preferable, and even more preferably 0.05 or less. If the coefficient of dynamic friction is too small, there may be a problem in the repairability (recoatability) of the coating film. Therefore, it is preferable to set the coefficient of dynamic friction of the three-point steel ball on the coating surface to 0.02 or more.

(4) Thickness If the thickness of the coating is too thin, peeling occurs during the scale removal work and the recoating work of the coating becomes frequent, which is inefficient, but if it is too thick, the economy may be impaired. The film thickness of the coating can be 5 μm to 2000 μm, 75 to 1000 μm in one embodiment, and 150 to 300 μm in yet another embodiment.

(Washing method)
A composition obtained by further adding a hydrolyzable silicone resin or an epoxy resin as a base resin containing 1 to 90% by weight of silicone oil is used in a sewage treatment plant and / or an industrial water treatment plant and / or a urine treatment plant. And / or water treatment and / or sludge treatment equipment installed in the final waste disposal site and / or general factory, and algae on the surface in contact with the liquid to be treated in the water treatment equipment including their pipes and other incidental equipment. A coating (coating film) is formed by applying it to a surface that can adhere to it, curing it, and drying it, and removing surface deposits containing algae adhering to this coating using a cleaning tool in the cleaning process of water treatment equipment. By doing so, the water treatment equipment can be cleaned.

As the cleaning tool, any device conventionally used for removing algae, such as a scaler, a skin ski, a brush, a waste cloth, a sponge, and a high-pressure water washer, can be used. When the coating is peeled off after cleaning, it is preferable to re-arrange the above-mentioned coating on the surface to be coated, which is in contact with the liquid to be treated, after removing the surface deposits. It is not necessary to reform the coating after removing the surface deposits every time the surface deposits are removed, and it is efficiently preferable to reform the coating appropriately according to the surface texture after the removal work. ..

Examples of the present invention are shown below together with comparative examples, but these examples are provided for a better understanding of the present invention and its advantages, and are not intended to limit the invention. In addition, "part" in an Example and a comparative example indicates a part by weight unless otherwise specified.

Coatings 1 to 12 (Examples) and 13 to 17 (Comparative Examples) composed of the compositions having the composition shown in Table 1 were prepared. Coatings 1 to 4 and 7 to 16 are made of hydrolyzed silicone, and samples 5 to 6 are made of epoxy resin paint. As for each composition, as long as the above-mentioned parameters (1) to (4) can be satisfied, there are no particular restrictions on the molecular weight, the modified product, the composition, etc., and it goes without saying that a filler such as a pigment may be used. .. Of course, a solvent may be appropriately used when producing or painting the paint (not included in the composition by weight in Table 1). The coating 17 was unpainted on the stainless steel plate. For coatings 1 to 6, 7 to 12, and 13 to 16, an epoxy resin layer of 40 μm was arranged on the surface to be coated as an undercoat layer.

In Table 1, as the "hydrolyzed silicone", a one-component reaction-curable silicone resin (RTV) manufactured by Shin-Etsu Chemical Co., Ltd., trade name KE 42 was used. As "epoxy", Mitsubishi Chemical Corporation, liquid epoxy resin, trade name 1001X75 and T & K TOKA Co., Ltd., modified polyamide adduct curing agent, trade name Tomide 423 are applied so as to have an equivalent ratio of 0.6 immediately before painting. Prepared in. As the "silicone oil", a polyether-modified silicone oil manufactured by Shin-Etsu Chemical Co., Ltd., trade name KF353 was used. For the "undercoat", Kansai Paint Co., Ltd.'s epoxy resin paint and trade name Epomarin GX were used.

The dry coating film according to Examples and Comparative Examples was applied by spray coating on a plate of a stainless steel material (3.2 × 70 × 150 mm SUS304 steel plate) so that the dry film thickness in Table 1 could be obtained. (Coating) was prepared. The characteristics of the dry coating film shown in Table 1 were measured after the paints obtained from Samples 1 to 17 were applied and then cured and dried in a constant temperature room at 23 ° C. for 7 days. Each characteristic was measured according to the following.

(Paraffin contact angle)
The static contact angle of paraffin was measured using a contact angle meter "DMe-211" manufactured by Kyowa Surface Chemistry Co., Ltd.

(Dynamic friction coefficient)
The three-point steel ball type friction coefficient was measured using an automatic friction and wear analyzer "TSf-503" manufactured by Kyowa Surface Chemistry Co., Ltd. The measurement conditions were a weight with a load of 1 kg at 5 cm / sec, and the average value of the horizontal force (kg) / 1 kg was taken as the friction coefficient from the stress when sliding horizontally on the coating film.

(Coating film thickness)
The film thickness of the coating was measured using an iron surface / non-iron metal surface film thickness meter "SAMAC-FN" manufactured by Sanko Electronics Laboratory Co., Ltd. In the system using the undercoat, the film thickness of the undercoat was measured in advance by fixed point measurement, and the thickness of the undercoat was subtracted from the total film thickness to obtain only the film thickness of the coating.

The coating adhesion test, the algae adhesion stain resistance test, and the algae removal product test were evaluated according to the following procedure. The results are shown in Table 2.

(Coating adhesion)
The surface of coatings 1 to 17 was rubbed strongly with a nylon brush 10 times as initial adhesion before the test, and the adhesion of each coating at that time was evaluated based on the following evaluation criteria.
(Evaluation level)
◎: No peeling is seen at all 〇: Only scratches are left on the coating, and no peeling itself is seen.
Δ: Some peeling is seen.
×: Significant peeling.

(Algae adhesion stains)
After immersing the test plates prepared with the coatings 1 to 17 according to the examples and comparative examples in the actual equipment (overflow wall where the treated water of the first settling basin outside the sewage treatment facility flows out) for 60 days, the test plates are immersed. It was pulled up and the algae adhered stains were evaluated based on the following evaluation criteria.
(Evaluation level)
⊚: No algae adhered stains can be seen. Or it is very thin and slightly visible.
〇: The substrate can be seen with only a thin amount of algae attached, and no significant attached stains can be seen.
Δ: Algae are attached, and the substrate is invisible.
X: Adhesion of algae is remarkable, the substrate cannot be confirmed, and the growth of algae can be confirmed.

(Removability of algae)
After the evaluation of the adhesion stain property of the algae, the removal property evaluation of the algae was evaluated. The attached algae were rubbed with a nylon brush, and the degree of removal was evaluated based on the following evaluation criteria.
(Evaluation level)
◎: It falls off with a nylon brush just by stroking it lightly.
〇: It will come off just by rubbing it with a nylon brush.
Δ: It falls off when repeatedly rubbed with a nylon brush.
×: Nylon brush hardly falls off.

Claims (4)

(A) Sewage treatment plant, (B) Industrial water treatment plant, (C) Sewage treatment plant, (D) Waste final disposal site, (E) Water treatment equipment and / or sludge treatment equipment installed in general factories And (f) A water treatment facility that includes ancillary equipment such as the pipes of (a) to (e) above, on the surface where algae that may be generated in the water treatment facility may adhere to the surface in contact with the liquid to be treated. On the other hand, a water treatment facility characterized by having a coating having the following characteristics (1) to (4).
(1) The coating contains a base resin and silicone oil, and the coating contains 1 to 90% by weight of silicone oil.
(2) The paraffin contact angle of the coating surface is 30 ° or more.
(3) Using the automatic friction and wear analyzer "TSf-503" manufactured by Kyowa Surface Chemistry Co., Ltd., the horizontal force (horizontal force) is obtained from the stress when a weight with a load of 1 kg is slid horizontally on the coating film at 5 cm / sec. When the average value of kg) / 1 kg is taken as the friction coefficient, the dynamic friction coefficient of the coating surface is 0.15 or less.
(4) The thickness of the coating is 5 to 2000 μm. The water treatment equipment according to claim 1 , wherein an undercoat is used on the surface to which the algae can adhere, and the undercoat contains an epoxy resin. (A) Sewage treatment plant, (B) Industrial water treatment plant, (C) Urine treatment plant, (D) Waste final disposal site, (E) Water treatment equipment and / or sludge treatment equipment installed in general factories And (f) In the water treatment equipment including the ancillary equipment such as the pipes of (a) to (e) above, on the surface where the algae that may be generated in the water treatment equipment may adhere to the surface in contact with the liquid to be treated. Water including removing surface deposits containing the algae adhering to the surface of the coating of a water treatment facility provided with a coating having the following properties (1) to (4) using a cleaning tool. How to clean the treatment equipment.
(1) The coating contains a base resin and silicone oil, and the coating contains 1 to 90% by weight of silicone oil.
(2) The paraffin contact angle of the coating surface is 30 ° or more.
(3) Using the automatic friction and wear analyzer "TSf-503" manufactured by Kyowa Surface Chemistry Co., Ltd., the horizontal force (horizontal force) is obtained from the stress when a weight with a load of 1 kg is slid horizontally on the coating film at 5 cm / sec. When the average value of kg) / 1 kg is taken as the friction coefficient, the dynamic friction coefficient of the coating surface is 0.15 or less.
(4) The thickness of the coating is 5 to 2000 μm. The method for cleaning a water treatment facility according to claim 3, further comprising arranging a coating having the characteristics of (1) to (4) on the surface in contact with the liquid to be treated after removing the surface deposits. ..