JPH0643289B2 - Algae fungicide - Google Patents

Description

TECHNICAL FIELD The present invention relates to an algae disinfectant, and more particularly, to a cooling tower, elevated water tank, water tank, pool, solar system, sterilization for hydroponics, algae prevention, water solubility. The present invention relates to an algae disinfectant used for prevention of spoilage of oils and removal of offensive odors, cooling water channels, sewage treatment, removal of bacteria from semiconductor RO membranes and the like.

(Prior art and its problems) When bacteria and aquatic organisms are generated in cooling towers, water tanks, pools, solar systems, irrigation water, cooling water for power plant condensers, etc., where fresh water is circulated or stored, hygiene and economy It becomes a serious problem in terms of management such as aspect.

For example, when a large amount of bacteria is generated in the cooling tower, it forms a gelatinous mass, combines with other solid matter to form slime, and adheres to the inner wall of the tank and the pipe wall, causing local corrosion and pitching. In addition, algae are generated in large quantities in places exposed to light, such as spray bonds, fillers, and vessels, which obstruct the water flow and cause pitching. In order to prevent and remove this slime and algae, conventionally, filtration by a filter, adsorption by a porous material such as zeolite, and disinfection by adding a chemical such as an organic tin compound have been performed, but it is complete. I can't say.
On the other hand, in the pool, as the usage frequency increases, water pollution due to abnormal growth of Escherichia coli, deterioration of purification function due to generation of algae, etc. become a problem. Chlorine sterilization is carried out to prevent water pollution in the pool, but if the chlorine concentration becomes high, it will cause damage to the eyes and pharynx of the human body, causing discoloration of the swimsuit, and its use will be restricted. Becomes

Therefore, the present applicants have solved the above problems by using a water-soluble glass containing monovalent Ag ⁺ ions having a characteristic of excellent sterilization and microbiocidal action, which is wrapped with a water-permeable cloth in order to solve the above-mentioned conventional drawbacks. Providing a solution (Japanese Patent Application No. 61-179)
No. 415 and Japanese Patent Application No. 61-183055). However, this silver glass water treatment agent has a low dissolution rate of soluble glass, and Ag ⁺ ions are gradually and continuously eluted from the surface thereof, so that transient non-circulating water channels and silver ion It was not suitable for highly polluted water systems that required high concentrations because the elution concentration of silver ions was low. Further, there is a drawback that impurities contained in the glass component of the base material, which are unavoidable in glass production, are eluted together with silver ions.
Therefore, the present inventor has also developed a non-glass type agent which also uses Ag ⁺ ions as a main component for algae and sterilization, and usually develops an aqueous solution type agent, not only a circulation system but also a non-circulation cooling water channel, sewage treatment,
It is an object of the present invention to provide a low cost algae disinfectant suitable for removing bacteria from a semiconductor RO membrane and the like.

(Means for Solving Problems) Means of the present invention for achieving the above object will be described.

That is, the anti-algal fungicide of the present invention, Ag ⁺ ion in the total solution containing an aqueous solution of silver nitrate as a main agent in the solution, an aqueous solution of phytic acid as an auxiliary agent, and an aqueous solution of polyacrylic acid as an auxiliary agent and a dispersant. Concentration of 0.085ppm or more, pH =
It is characterized in that it is about 7.0 to 8.5.

It is known to those skilled in the art that the monovalent silver ion used in the present invention is effective in killing bacteria and aquatic organisms, and therefore the description thereof will be omitted.

Phytic acid is a hexaphosphoric acid ester of myo-inositol, which is an organic phosphoric acid compound that is abundant in the plant kingdom. Although phytic acid has been known for a long time, its chemical structure and biosynthetic pathway have not been clearly proved.

The Anderson formula C ₆ H ₁₈ O ₂₄ P ₆ is most often used, although many researchers support the Neuberg formula C ₆ H ₂₄ O ₂₇ P ₆ .

Phytic acid is particularly abundant in seeds and cereals in the plant kingdom, is abundant in the sugar layer of brown rice, and is also abundant in the bulbs of plants.

For phytic acid, prevention of struvite formation such as salmon, trout, crab, shrimp, and tuna can in edible canning and prevention of black discoloration of clams, cans, etc. There is also a literature.

The aqueous solution of phytic acid acts as an acid and the relationship between its concentration and PH is shown in Table 1.

Next polyacrylic acid used in the present invention are small polymers having relatively degree of polymerization which is one of organic acid "acrylate" and _(CH 2 = CH-COOH) as a basic skeleton (molecular weight). This low molecular weight polyacrylic acid copolymer is said to have excellent thermal stability, moderate chelating ability and dispersing function, and outstanding crystal distortion effect on the scale component of the aqueous solution. It is also a substance that is drawing attention as a circuit scale inhibitor.

Since phytic acid is a strong acid, it is necessary to improve the bactericidal action of Ag ⁺ ions by adjusting it to a neutral or weak acrylic property using an appropriate pH adjusting agent. Sodium bicarbonate or the like is used as the adjusting agent.

In the present invention, silver nitrate, phytic acid, and polyacrylic acid are each prepared as an aqueous solution, and the pH of the entire solution is kept at about PH = 7.0 to 8.5 before use. Since the solution type of the present agent is added to the water to be treated at an effective concentration or higher according to the conventional chemical injection method, its bactericidal ability is faster than that of the glass-based prior art. As can be seen from the test results described below, the minimum required Ag ⁺ ion concentration of this drug is 0.085 ppm or more, and below this, almost no effect is exhibited.

(Function) Monovalent silver ion Ag ⁺ of silver nitrate AgNO ₃ aqueous solution directly acts on cells of living organisms and kills bacteria and algae. Ag ⁺ ion concentration required for sterilization and algae control is the condition of treated water. It also depends on the number of microorganisms in the water. In addition, the sterilizing ability of this aqueous solution is higher when the water temperature is higher than when it is low.
However, alkaline is more effective than acidic.

According to Anderson's structural formula, phytic acid has 18 (O
H) group, which is ionized in solution AgO
It encloses H and suppresses unstable Ag ⁺ ions from being oxidized and converted into Ag ₂ O, and promotes stable generation of Ag ⁺ ions to improve sustainability of bactericidal effect.

Since polyacrylic acid has a carboxyl group (COO ⁻ ) in the side chain and forms various salts, the degree of difficulty (COO ⁻ ) can be controlled and acts as a dispersant, as well as a boiler agent and a cooling water circuit. Also acts as a scale inhibitor.

(Example) Hereinafter, the Example of this invention is described.

80 gr of AgNO ₃ is dissolved in 1 of distilled water to prepare a solution A.

Mix liquid A with phytic acid 1 to prepare liquid B.

Adjust the pH of solution B to 8.5 with sodium bicarbonate and use it as solution C.

Polyacrylic acid 1 is mixed with C liquid to prepare D liquid.

Liquid D is diluted with distilled water to obtain 30 Ag-phytic acid solution.

The Ag concentration of this example is 8 in a solution of AgNO _3.
Since it is mixed with 0 gr, the Ag equivalent concentration is 80 g x (107.88 / 169.88) = 50.8 g from its molecular weight, and it is 50.8 g / 30.000 cc = 0.0017 g / cc per 1 cc.

Therefore, when 100 ppm of this agent is used per 1 m ^{3 of} water to be treated, the Ag ⁺ ion concentration is 0.17 ppm.

Next, the results of the sterilization (algae prevention) performance test of this Ag-phytic acid solution are shown in Table 2.

The Ag-phytic acid solution was added to the effluent of the purification layer before sterilization, and the mixture was cultured in a desoxycholate medium at 36 ± 1 ° C. to measure the number of general bacteria.

From the above table, it was found that the addition amount of 50 ppm (Ag ⁺ ion concentration 0.085 ppm) or more has a bactericidal ability.

Table 2 shows a bactericidal effect test. Since a certain kind of bacteria receives light energy and generates algae, algae will not be generated if no bacteria are detected. Therefore, it can be said that it is also effective against algae.

(Effect) As described above, the antialgal fungicide of the present invention contains a monovalent Ag ⁺ ion as a main component that directly acts on the cells of microorganisms to kill algae and bacteria, and is usually a non-glass type and is an aqueous solution type. Since it is adjusted and it is dosed to the water to be treated, it has excellent quickness. The present anti-algae disinfectant on is because it uses phytic acid organic acid bio for damage resistance is nil as an aid, many (OH) carboxyl groups and polyacrylic acid having a phytic acid (COO ^- ), Together with promoting the stable production of Ag ⁺ ions, exerts its power not only in a circulating system but also in a non-circulating cooling water circuit, sewage treatment, and removal of bacteria from semiconductor RO membranes. Furthermore, it is easy to handle and has the advantage of being able to manage water at low cost.

Claims (1)

[Claims] 1. A solution containing an aqueous solution of silver nitrate as a main agent, an aqueous solution of phytic acid as an auxiliary agent, and an aqueous solution of polyacrylic acid as an auxiliary agent and a dispersant, and the concentration of Ag ⁺ ions in the entire solution is 0.1. An algae disinfectant characterized by having a pH value of 085 ppm or higher and a pH of about 7.0 to 8.5.