TW201418165A - Method of using peracetic acid for inhibiting microorganisms on water treatment - Google Patents

Abstract

The present invention discloses a process of using peracetic acid for inhibiting microorganisms on water treatment, comprising a step of allowing an environment contact of elements including: a diluent of acetic acid; and a surfactant that contains at least 9 carbon atoms in the carbon chain with concention being 0.001 to 60 times of the acetate acid; and water treatment for at least 1 minute, wherein the surfactant containing a carbon chain having at least 9 carbon atoms is able to penetrate hydrophobic substance in the environment to enhance the ability of acetic acid for inhibiting pathogenic microorganisms.

Description

Method for inhibiting microorganisms by water treatment with peracetic acid

The present invention relates to a method of treating water with peracetic acid to inhibit microorganisms.

Microorganisms in cooling water, wastewater, and pipelines for transporting water are prone to serious problems of discoloration, odor, and corrosion of water. For example, sulfurized bacteria can cause pitting on the metal surface, and algae can cause odor, water hole reduction, and blockage. Filters, and when a large number of algae die, deplete oxygen in the water for spoilage oxidation, thereby promoting the growth of anaerobic bacteria.

Traditionally, in the application of water treatment, antibacterial agents have been used very early to carry out sterilization of water in the treatment of cooling water, waste water and pipelines for conveying water. These antibacterial agents include quaternary amine salts and aldehydes. Such as chloral and glutaraldehyde, and chlorine compounds such as sodium hypochlorite, chloramine, p-toluenesulfonium chloramine, chloroimide, 1,3 dichloro-5,5 dimethyl carbendazim, Methylene dithiocyanate, vinyl chloride dithiocyanate, etc., these fungicides such as sodium hypochlorite will increase conductivity and at the same time easily form corrosion. Aldehydes are carcinogenic and have serious effects on the environment; quaternary amines have weaker bactericidal activity against Gram-negative bacteria; and sodium hypochlorite is also insufficiently sterilized for some strains, although increasing the concentration can increase bactericidal power, but relative Unfavorable impacts on the environment, such as chlorine compounds, can cause problems with chloroform carcinogens. All of these substances have the problem of insufficient broad-spectrum, resulting in the killing of the dominant species of the population in the water, but the inferior species that kill the immortality replace the dominant species of the population after the multiple use of the fungicide, so that the water is in the water. It is often necessary to regularly replace different fungicides for sterilization.

Peracetic acid has strong bactericidal power, broad-spectrum and biodegradable Environmentally friendly, early use in high-level disinfection of medical devices (including plastic products), also used in food processing plants as a disinfection cleaning process on solid surfaces, containers and transfer lines.

The preparation of peracetic acid can be carried out by reacting a solution of acetic acid, hydrogen peroxide and water, or by reacting a guanamine compound such as tetraacetylethylenediamine (TAED) with an inorganic peroxide in water. The aqueous phase/oil phase of peracetic acid is 98:2, which is a hydrophilic material, but has poor permeability to hydrophobic substances. To date, there have been few reports and related products mentioning the use and use of peracetic acid plus surfactants for water treatment to inhibit microorganisms in treated water.

In response to the needs of the art, the present invention discloses a method for inhibiting microorganisms in water treated with water by peracetic acid, which comprises administering water to be treated with water: (1) diluted peracetic acid a surfactant having a peracetic acid concentration of at least 0.001 ppm or more in water treated with water; and (2) a surfactant having a carbon chain of at least 9 carbon atoms at a concentration of 0.001 to 60 times the concentration of the diluted peracetic acid Wherein the diluted peracetic acid after administration is contacted with the diluted surfactant for water treated with water for at least 1 minute. The surfactant comprising a carbon chain of at least 9 carbon atoms enhances the penetration of peracetic acid into the hydrophobic material of the water treated water and thereby enhances the ability of peracetic acid to inhibit microorganisms.

The following is an example of application of water treated with water, but the present invention is not limited to the embodiment, and can be applied to sterilization of an underwater environment such as cooling water, waste water, and pipeline treatment of conveying water, and related embodiments thereof The environment and its application data are not described here.

In one embodiment of the invention, peracetic acid can be prepared by hydrogen peroxide, acetic acid, water, under the catalysis of an acid.

In one embodiment of the invention, peracetic acid can be prepared by reacting a peroxide salt or hydrogen peroxide with a guanamine compound in water.

The concentration used in the present invention is calculated in ppm per part per million.

In one embodiment of the invention, the surfactant is an anionic surfactant comprising a carbon chain of at least 9 carbon atoms, a nonionic surfactant comprising a carbon chain of at least 9 carbon atoms, or a mixture thereof .

In one embodiment of the invention, the anionic surfactant comprising a carbon chain of at least 9 carbon atoms comprises: an alkyl sulfate comprising a carbon chain of at least 9 carbon atoms, a carbon comprising at least 9 carbon atoms Chain polyoxyethylene ether sulfate, polyoxyethylene alkylphenyl ether sulfate containing carbon chain of at least 9 carbon atoms, alkyl phosphate containing at least 9 carbon atoms, containing at least 9 An alkyl phosphate salt of a carbon chain of a carbon atom, a polyoxyethylene alkylphenyl ether phosphate of a carbon chain containing at least 9 carbon atoms, a fatty acid salt of a carbon chain containing at least 9 carbon atoms, and at least 9 An alkyl sulfonate of a carbon chain of a carbon atom, an alkylbenzene sulfonate comprising a carbon chain of at least 9 carbon atoms, an α-olefin sulfonate comprising a carbon chain of at least 9 carbon atoms, comprising at least 9 An α-sulfonated fatty acid salt of a carbon chain of a carbon atom, a peroxycarboxylic acid comprising a carbon chain of at least 9 carbon atoms, an alkali metal salt of a peroxycarboxylic acid comprising a carbon chain of at least 9 carbon atoms, comprising at least a carboxylic acid of a carbon chain of 9 carbon atoms, a carboxylic acid alkali gold salt of a carbon chain containing at least 9 carbon atoms And their mixture.

In one embodiment of the invention, the non-ionic surfactant comprising a carbon chain of at least 9 carbon atoms comprises: a polyoxyethylene alkyl ether comprising a carbon chain of at least 9 carbon atoms, comprising at least 9 carbons a polyoxyethylene alkylphenyl ether of a carbon chain of an atom, a carbon chain containing at least 9 carbon atoms Polyoxyethylene-polyoxypropene alcohol, and a mixture thereof.

In one embodiment of the invention, the peroxycarboxylic acid comprising a carbon chain of at least 9 carbon atoms comprises peroxynonanoic acid, peroxydecanoic acid, peroxyundecanoic acid. (peroxyundecanoic acid), peroxydodecanoic acid or a mixture of them.

In one embodiment of the present invention, the carboxylate of the carbon chain comprising at least 9 carbon atoms includes nonanoic acid, decanoic acid, undecanoic acid, lauric acid. (dodecanoic acid), tridecanoic acid, tetradecanoic acid, an alkali metal salt of the foregoing, or a mixture thereof.

In one embodiment of the present invention, a metal ion chelating agent may be used to avoid catalytic decomposition of peracetic acid by metal ions in the water, wherein the metal ion chelating agent comprises Ethylenediaminetetraacetic acid (EDTA) and its sodium salt. Diethyltriaminepentaacetic acid (DTPA) and its sodium salt, polyphosphate, organophosphate, phosphate, polyacrylate, organophosphate, sodium gluconate, and mixtures thereof.

In one embodiment of the invention, the surfactant may comprise a pH buffering agent such that the diluted peracetic acid and the diluted surfactant are interposed in the pH of the water and/or environmental solid surface being treated with water. At 2-10.5.

In one embodiment of the present invention, the hydrophobic substance includes the oil and fat in the water treated with water, the cell wall of the Gram-positive bacteria and the Gram-negative bacteria, and the cell wall of the fungal microorganism. Chitin of nitrogen polysaccharides.

It is a good way to use microperacetic acid to inhibit microorganisms in pool water. In the method, the aqueous phase/oil phase of peracetic acid has a ratio of 98:2, which is a hydrophilic substance, but has poor permeability to hydrophobic substances. There are many hydrophobic substances in the water such as waste water and water storage tanks, which will affect the bactericidal power of peracetic acid, such as oil in water, cell wall containing Gram-positive bacteria and Gram-negative bacteria with hydrophobic peptide peptidoglycan. The cell wall contains a chitin-containing fungus containing a nitrogen-containing polysaccharide, which hinders the hydrophilic peracetic acid from contacting the microorganisms in the pool water, thereby reducing the bactericidal effect.

In addition, in the microscopic view of the bacterial structure, the cell walls of Gram-positive bacteria and Gram-negative bacteria contain hydrophobic peptide glycan glycosides, of which Gram-positive bacteria have thicker cell walls and high content. Peptidoglycan; the fungal cell wall contains chitin containing nitrogen-containing polysaccharides; the bacterial wall of mycobacteria and nucleus contains long-chain waxy properties of up to 20 to 30 carbons, making them relatively Hydrophilic peracetic acid acts as a hydrophobic barrier. The toxicity of peracetic acid is much lower than that of other fungicides used in water, and it produces harmless acetic acid, water and oxygen after degradation, and is suitable for use in the sterilization and purification of water in the treatment of cooling water, waste water and pipelines for conveying water.

The present invention uses a surfactant having a carbon chain of at least 9 carbon atoms to enhance the penetration of the above-mentioned hydrophobic substance in water subjected to water treatment, thereby enhancing the sterilizing power of peracetic acid to suppress microorganisms in water subjected to water treatment.

In order to further illustrate the technical means and efficacy of the present invention for achieving the intended purpose of the invention, the method for inhibiting pathogenic microorganisms in the treatment of peracetic acid in water according to the present invention and its application, its specific embodiment, characteristics and efficacy , the detailed description is as follows.

The following is an example in which the water treated in water is used to inhibit the application of microorganisms, but the present invention is not limited to the embodiment, but can be applied to cooling. The sterilization of the underwater environment such as the treatment of water, waste water and pipelines for conveying water, the environment of the relevant embodiments and the application data thereof will not be described again.

The following examples are merely illustrative of the invention and are not intended to limit the scope of the invention. Any modifications to this embodiment are still within the scope of the invention in the spirit of the invention.

<Example>

Preparation of A, B and C two groups of surfactants containing different components of the peracetic acid sterilizing aqueous solution, group A containing 37.7 mg / L of peracetic acid, group B containing 37.7 mg / L of peracetic acid, 88 mg / L of twelve Sodium alkylbenzene sulfonate and 47 mg/L polyoxyethylene lauryl ether. Group C contained 18.8 mg/L peracetic acid, 16.1 mg/L peroxydecanoic acid, 88 mg/L sodium dodecylbenzenesulfonate, and 47 mg/L polyoxyethylene lauryl ether. The killing rate of three groups of sterilizing liquid against Pseudomonas aeruginosa, Staphylococcus aureus, and Candida albicans in the amount of 5x10 ⁶ cfu/ml was tested at 20 °C.

Test methods: Pseudomonas aeruginosa and Staphylococcus aureus were tested according to EN 1276, and Candida albicans was tested according to EN 1650.

The results are as follows (1), (2), (3):

(1) Pseudomonas aeruginosa (genus Gram-negative bacteria):

(2) Staphylococcus aureus (genus Gram-positive bacteria):

(3) Candida albicans (genus fungi):

From the above table (1), (2) and (3), it can be found that the bactericide containing the surfactant, especially for the gram-negative bacteria Pseudomonas aeruginosa, the gram-positive bacteria of Staphylococcus aureus and The fungus-resistant Candida albicans has a significantly stronger bactericidal power.

Claims (12)

A method for inhibiting microorganisms by water treatment comprising: administering water treated with water: (1) diluted peracetic acid, the concentration of peracetic acid in the water treated with water being at least 0.001 ppm or more And (2) a surfactant having a carbon chain of at least 9 carbon atoms at a concentration of 0.001 to 60 times the concentration of the diluted peracetic acid; wherein the incorporation comprises at least 9 carbons after being administered for at least 1 minute The atomic carbon chain surfactant enhances the penetration of peracetic acid into the hydrophobic material in the water treated water and thereby enhances the ability of peracetic acid to inhibit microorganisms. The method of claim 1, wherein the surfactant comprising a carbon chain of at least 9 carbon atoms is an anionic surfactant comprising a carbon chain of at least 9 carbon atoms, comprising at least 9 carbon atoms. A non-ionic surfactant of a carbon chain, or a mixture thereof. The method of claim 2, wherein the anionic surfactant is selected from the group consisting of alkyl sulfates, polyoxyethylene ether sulfates, polyoxyethylene alkylphenyl ether sulfates, alkyl phosphates, and alkane. Phosphate salt, polyoxyethylene alkylphenyl ether phosphate, fatty acid salt, alkyl sulfonate, alkyl benzene sulfonate, α-olefin sulfonate, α-sulfonated fatty acid salt, carboxylic acid, including a carboxylic acid alkali metal salt of a carbon chain of at least 9 carbon atoms, a peroxycarboxylic acid, an alkali metal salt of a peroxycarboxylic acid containing a carbon chain of at least 9 carbon atoms, or a mixture thereof. The method of claim 2, wherein the nonionic surfactant is selected from the group consisting of polyoxyethylene alkyl ethers, polyoxyethylene alkyl phenyl ethers, polyoxyethylene-polyoxypropylene alcohols, or a mixture thereof. . The method of claim 2, wherein the surfactant comprises a pH buffering agent to dilute the peracetic acid and the diluted surfactant. The pH of the water and/or environmental solid surface to be treated with water is between 2-10.5. The method of claim 5, wherein the pH buffer comprises a carboxylic acid having less than 9 carbon atoms, and the diluted peracetic acid and the diluted surfactant are on the surface of the farm water and/or the environmental solid. The pH is between 2-10.5. The method of claim 3, wherein the peroxycarboxylic acid is selected from the group consisting of peroxynonanoic acid, peroxydecanoic acid, peroxyundecanoic acid or Peroxydodecanoic acid or a mixture of these. The method of claim 3, wherein the carboxylic acid is selected from the group consisting of nonanoic acid, decanoic acid, undecanoic acid, decanoic acid, thirteen A mixture of tridecanoic acid or tetradecanoic acid or a mixture thereof. The method of claim 1, wherein the hydrophobic substance comprises the cell wall pitpeptidan, and the fungal microorganism of the oil, the Gram-positive bacteria and the Gram-negative bacteria in the water treated with water. The chitin of the nitrogen-containing polysaccharide of the cell wall. The method of claim 1, wherein a metal ion chelating agent is selected to prevent catalytic decomposition of peracetic acid by a metal ion chelating agent selected from the group consisting of Ethylenediaminetetraacetic acid (EDTA). Or its sodium salt, Diethyltriaminepentaacetic acid (DTPA) or its sodium salt, polyphosphate, organophosphate, phosphate, polyacrylate, organophosphate, sodium gluconate, or their Mix of. a surfactant containing a carbon chain of at least 9 carbon atoms The use of peracetic acid to penetrate the hydrophobic material in the water subjected to water treatment and thereby enhance the ability of peracetic acid to inhibit microorganisms. The method of claim 1, wherein the water treatment comprises a method of inhibiting microorganisms for cooling water, sewage water, rain water, pool water, aquaculture water, storage water, and a liquid transfer line.