JPH02229101A - Method and agent for controlling algae - Google Patents

Abstract

PURPOSE:To control algae in a small amount of chemicals by adding a controlling agent against the algae containing glutaric dialdehyde and 3- cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4-(1H,3H)dione to objective river systems. CONSTITUTION:A controlling agent for algae containing glutaric dialdehyde and 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,5-triazine-2,4-(1H,3H)dione at (99:1)-(50:50), preferably (95:5)-(70:30) weight ratio. The above-mentioned controlling agent is effective in controlling algae (especially algae of the genus Ulothrix, Hormidium or Microspora) belonging to the suborder Ultrichineae and added in an amount of 1-30mg/l active ingredient to objective river systems. The chemicals used themselves have low or no corrosiveness, irritancy, foaming properties, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application This invention relates to an algae control agent and an algae control method. More specifically, the present invention relates to algae control agents and algae control methods that are highly effective in preventing problems caused by algae growth in various industrial water/drainage systems and various water storage systems.

(b) Conventional technology Various industrial water/drainage systems and various water storage systems, more specifically,
In various water systems that are exposed to sunlight, such as cooling towers, water storage pits, pools, and open water tanks in cooling water systems, green algae and blue-green algae, such as those of the genus Chlorella and Anabaena, proliferate, resulting in deterioration of water quality, generation of bad odors, and aesthetic appearance. In particular, in cooling towers, cooling efficiency may be reduced, corrosion of metal materials may be induced, and
It has been known that these exfoliated algae cause various problems such as clogging the cooling system.

Therefore, various algaecides have been proposed in the past, and in the past, organic mercury compounds such as ethylmercury phosphate and phenylmercury acetate, and chlorine-based compounds such as pentachlorophenol and trichlorophenol were used. However, such drugs are not desirable because they are highly toxic, and their use is regulated from the viewpoint of pollution.

In this regard, various proposals have been made to use relatively low toxicity compounds as algaecides.

The glutardialdehyde used in this invention is known alone as an algae control agent, and it is also known that a synergistic effect is exhibited when used in combination with a quaternary ammonium salt (JP-A-62-96401). ). On the other hand, 3-cyclohexyl-6-(tumethylamino)-1-methyl-1,35-triazine-2,4(LH
, 3H) dione (common name: hexazinone) is also known as an algae control agent (Japanese Patent Publication No. 3361/1983).

(c) Problems to be Solved by the Invention However, even when the above-mentioned low toxicity compounds are used, the algae control effect in the field is often insufficient at practical concentrations. As a result of investigating the cause of this, the inventors of the present invention found that the target algae with a markedly reduced control effect were members of the green algae, the suborder Hibimidorinae (formerly otrichine).
It was confirmed that the algae contained Ae). All of these algae of the suborder Hibimida form undivided filaments and reproduce in the form of fibers, so they grow by involving various scale components and slime-forming bacteria, and are partially protected by these scales. be. For this reason, compared to algae belonging to the genus Chlorella, which belongs to the same green algae network, and algae, which belong to the genus Anabaena, which belongs to the cyanobacteria, they are resistant to the control action of compounds, and as a result, the control effect is insufficient. Conceivable. Within this suborder, the algae that cause particular problems are of the genus Hormidium.
m) belongs to the genus Ulothrix or Microspora, and for these algae, use the aforementioned glutardialdehyde or hexazinone at the usual concentration (concentration that can control Chlorella and Anabaena). However, it was not effective.

This invention has been made to solve these problems.

The inventors of this invention have conducted various studies on a large number of compounds that exhibit practical algicidal properties, and have found that when the above-mentioned glutardialdehyde and hexazinone are used in combination, a synergistic effect that cannot be obtained when used alone. In particular, it has a remarkable synergistic effect against algae belonging to the suborder Phormidium, Hibimidoro, or Microspora, so it can be used at a concentration comparable to that of other algae. We have discovered that these algae can be effectively controlled at low concentrations. The present invention was achieved based on the fact that such a combination is industrially advantageous not only in terms of toxicity but also in terms of corrosiveness, irritation, and foaming properties.

(d) Means for Solving the Problems Thus, according to the present invention, glutardialdehyde (compound A) and 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,35-triazine-
2,4-(LH,3H)dione (compound B) at 99.
An algae control agent containing the algae in a weight ratio of 1 to 50.50 is provided.

The glutardialdehyde used in this invention may be of any commercially available grade, and generally contains about 50% glutardialdehyde.
It can be prepared manually as an aqueous solution containing up to 0 W/Y%.

On the other hand, 3-cyclohexyl-6-(dimethylamino)-
1-methyl-1,3,5-triazine-2,4-C11
Although (3H)dione can be synthesized according to the description in JP-A-53-56323, it is generally available as hexazinone [100% powder of compound (B)].

The combination ratio of the above compound (A) and compound (B) is 99:1
~50:50, and if it deviates from this range, the degree of synergistic effect will decrease and is not suitable.

The ratio of compound (A) and compound (B) is 98.2 to 6
A ratio of 0:40 is more preferable because a remarkable synergistic effect is exhibited, and a ratio of 95.5 to 70:30 is particularly preferred.

The above compounds are usually used in the form of direct mixtures for various target systems. In this case, since both are easily soluble in water, it is suitable to use them in the form of an aqueous solution containing 3 to 60% by weight as an active ingredient. At this time, organic solvents (glycols, glycol ethers, alcohols with up to 8 carbon atoms, esters, etc.), surfactants, anti-corrosion/scaling agents (polymerized phosphates, phosphonic acids, molybdic acid or their salts, divalent metal compounds, various carboxylic acids, water-soluble polymers, etc.) or bactericides (5-chloro-2-medylyisothiazolone-3-one, medilene bisthiocyanate, 4,5-dichloro-12- Aliphatic nitro alcohols such as dithiol-3-one, 2,2-dibromo-3-nitrilopropionamide, and 2-bromo-2-nitropropane-1,3-diol, etc.) may be used in combination.

However, each compound may be added separately depending on the case. Therefore, from the viewpoint of ponds, according to the present invention, compound A and compound B are added to the water system for algae control at 99.1 to 5
A method for controlling algae is provided, which is characterized in that a trace amount of the algae is added at a ratio of 0.50 (weight ratio). In this case, the combination ratio is preferably 982 to 6040 as described above, and 9
More preferably, the ratio is 55 to 70:30.

In particular, when the algae to be controlled are algae belonging to the suborder Hihimidorinae represented by the genus Phormidium, genus Hibimitoro, or Microspora, compound A or compound B alone has a good algae control effect even when the amount of electricity is 0. In contrast, in the present invention, a remarkable synergistic effect is exhibited and these harmful algae can be controlled with a low addition amount.

In this invention, the amount of the active ingredients (compound A and compound B) added is 0.5 to 50x'i/ to the water targeted for algae control.
Q, preferably 1 to 30 scraps/Q. Added amount is 0
．． If it is less than 5 mg/Q, the algae control effect will decrease, which is not preferable. Further, 5Qtttgi1 or more may be added, but this is not preferred for economical reasons.

- This invention will be explained using the following representative examples and test examples.

(Po) Example Example A large amount of algae adhered to the water sprinkling plate of a small cleaning tower of a certain petrochemical company, and a significant deterioration in functionality was observed. Therefore, glutardialdehyde was added as an active ingredient in batches once a week so that the amount of water retained was 30 rttg/Q. After one month, the algae seemed to have decreased slightly, but the problem still remained unresolved (comparative example). When these algae were collected and identified, it was found that the genus Phormidium (ormidium I), the genus Ulothrix, and the genus Microspora (Mic) belong to the suborder Hybimyridae.
The main body was algae belonging to the genus rospora.

Therefore, 9 parts by weight of glutaraldehyde, 3-cyclohexyl-6-(dimethylamino)-1-methyl-1,3,
When a composition consisting of 1 part by weight of 5-triazino-2,4(IH,,3)t)dione and 90 parts by weight of water was added as an active ingredient in batches of 5 mg/l to the amount of water held, algae appeared after one week. No adhesion was observed. Batch additions were made once a week thereafter at the above concentrations. Even after 2 months, no algae adhesion was observed and the condition was good.

Test example Phormidium (Ho) collected from the water sprinkler plate of a certain cooling tower
rmidium) and Ulothrix
) were placed in culture flasks containing MIN medium and shaken for 10 days at a temperature of 25° C. while providing light with an illuminance of 1500 lux to allow sufficient culture and propagation. 10 cc of the cultured algae was dispensed into L-shaped test tubes, then the drug was added, and the initial absorbance was measured using a photoelectric colorimetric system. After that, the light of 1 LL 500 lux was applied at a constant temperature (25°C) and the light was continuously shaken for 7 days, and the absorbance was measured at a fixed time once every - day to confirm the oral change in turbidity and the increase or decrease in absorbance over the 7 days. The algaecide rate was calculated using the formula.

(Margin below) Ax A.

Bx　　B.

BX: 78th blank absorbance Bo = early Drug additive absorbance on AX+7th day Ao: Early The test results are shown in Table 1.

(Left below) Table 1, Test results *1. Evaluation of algaecide rate...The algaecide rate in Table 1 was evaluated according to the following criteria and evaluated as 1, 2... 3... 4... 5...・ 6... 7... *2. Compound A *3. Compound B... 100% 80-100% 60-80% 40-60% 20-40% 0-20% 0% Glutardialdehyde 3-cyclohexyl-6-(dimethylamino)-1- Methyl 1.3.5-) riazine-2,4 (1H,3H)dione*4. DCMU...3-(3,4-dichlorophenyl)1,1-dimethylurea (known algaecide) However, for evaluation I, the green color of the algae is bleached by visual inspection, and the algae after the test is The algae were placed in a culture flask containing MIN medium and cultured with shaking for 10 days at a temperature of 25°C while providing light with an illuminance of 1500 lux, but the algae did not proliferate, and from this result, the algae after the above test were dead. It was confirmed.

Incidentally, the relationship between the usage ratio of glutardialdehyde (compound A) and hexazinone (compound B) and the algicidal effect is shown in FIG. In this way, compound A and compound B can be combined at about 9
It can be seen that an excellent synergistic algicidal effect, which cannot be obtained when each of these is used alone, is obtained within the range of usage ratios of 9:1 to 50:50.

(f) Effects of the invention According to this invention, various problems caused by the proliferation of algae, especially algae of the suborder Hibimyridae, can be eliminated by using a lower concentration of chemicals, and in particular, the same as that of other algae. It is possible to prevent damage at a concentration that is suitable for use.

The chemicals used themselves are also non-toxic, corrosive, irritating, and foaming, or have low foaming properties.

Therefore, the industrial utility of this invention is extremely large.

[Brief explanation of the drawing]

FIG. 1 is a graph diagram illustrating the relationship between the usage ratio of glutardialdehyde and hexanonone and the cast effect in the present invention.

Claims (1)

[Claims] 1. Glutardialdehyde (compound A) as an active ingredient
and 3-cyclohexyl-6-(dimethylamino)-1-
Methyl-1,3,5-triazine-2,4-(1H,3
H) dione (compound B) in a weight ratio of 99:1 to 50:50. 2. Compound A and compound B in a weight ratio of 98:2 to 60:
40. The algae control agent according to claim 1, comprising: 3. Add 99% of compound A and compound B to the water system for algae control.
A method for controlling algae, characterized by adding a small amount at a ratio of 1 to 50:50 (weight ratio). 4. Addition ratio of compound A and compound B is 98:2 to 60:
40. The method for controlling algae according to claim 3. 5. The amount added is 0.5 to 50 m to the water targeted for algae control.
The method for controlling algae according to claims 3 and 4, wherein the amount is g/l. 6. The method for controlling algae according to any one of claims 3 to 5, wherein the algae to be controlled are algae belonging to the suborder Hibimida. 7. The algae control method according to claim 6, wherein the algae to be controlled are algae of the genus Phormidium, genus Hibimidoro, or genus Microspora.