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KR-102963102-B1 - Method and composition for water treatment

KR102963102B1KR 102963102 B1KR102963102 B1KR 102963102B1KR-102963102-B1

Abstract

The present invention provides a method for controlling microorganisms in water, comprising the step of adding one or more bromine-based biocides and cis-2-decenoic acid or a salt thereof to water. A composition in the form of a liquid concentrate comprising a bromine-based biocide and cis-2-decenoic acid or a salt thereof is also described.

Inventors

  • 로덴스키 미할
  • 졸코프 첸
  • 데이비스 데이비드 지.

Assignees

  • 브로민 콤파운드 리미티드
  • 더 리서치 파운데이션 포 더 스테이트 유니버시티 오브 뉴욕

Dates

Publication Date
20260508
Application Date
20200527
Priority Date
20190528

Claims (20)

  1. Step of adding one or more bromine-based biocides and cis-2-decenoic acid or a salt thereof to water A method for controlling microorganisms in water, comprising The above bromine-based biocide A) Non-oxidizing bromine-based biocides selected from the group consisting of the following: A1) 2-bromo-2-nitro-1,3-propanediol (Bronopol); and A2) 2,2-dibromo-3-nitrilopropionamide (DBNPA);; and B) Oxidizing bromine-based biocides selected from the group consisting of the following: B1) 1-Bromo-3-chloro-5,5-dimethylhydantoin (BCDMH); B2) As an on-site oxidized bromide source that releases an active bromine species into water, the on-site oxidized bromide source Sodium bromide, which is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its active form to be added to a water system to be treated, HBr, which is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its active form to be added to the water system to be treated, Ammonium bromide, which is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its active form to be added to a water system to be treated, and A solution of HBr/NaBr and urea that is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its bromourea active form to be added to a water system to be treated. An on-site oxidized bromide source selected from the group consisting of; and B3) Sulfamate-stabilized aqueous solution of alkali hypobromite containing bromosulfamate Selected from a group consisting of, Method for controlling microorganisms in water.
  2. In paragraph 1, The above-mentioned microbial control method comprises fighting plankton bacteria and/or biofilm bacteria on a surface upon contact with water and/or inhibiting biofilm formation on a surface susceptible to biofilm growth.
  3. In paragraph 1, The above bromine-based biocide 2-Bromo-2-nitro-1,3-propanediol (Bronopol); and 2,2-Dibromo-3-Nitrilopropionamide (DBNPA) A method of a non-oxidizing bromine-based biocide selected from
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  5. In paragraph 1, The above bromine-based biocide is B1) 1-bromo-3-chloro-5,5-dimethylhydantoin (BCDMH), method.
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  9. In paragraph 1, The above-mentioned oxidizing bromine-based biocide Sodium bromide, which is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its active form to be added to a water system to be treated; As HBr, HBr is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its active form to be added to the water system to be treated; Ammonium bromide, which is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its active form to be added to a water system to be treated; and A solution of HBr/NaBr and urea that is oxidized on-site with hypochlorite or chlorine or electrochemically to produce its bromourea active form to be added to a water system to be treated. B2) an on-site oxidized bromide source selected from, method.
  10. In any one of paragraphs 1 through 3, 5 and 9, A method in which the effective microbiocidal dose of the above bromine-based biocide is 1 to 100 ppm and the enhancement-inducing amount of cis-2-decenoic acid is 0.005 to 5 ppm.
  11. In any one of paragraphs 1 through 3, 5 and 9, A method in which a low-purity CDA grade with a purity of less than 95%, as measured by gas chromatography, is added to water.
  12. In any one of paragraphs 1 through 3, 5 and 9, A method in which the bromine-based biocide and CDA are supplied to an industrial water stream in contact with an infested surface using a plurality of feed solutions, so that the biocide and CDA are added to the water sequentially or simultaneously.
  13. In any one of paragraphs 1 through 3, 5 and 9, A method in which the above-mentioned bromine-based biocide and CDA are supplied to industrial water in contact with a pervasive surface using a single feed solution, so that the biocide and CDA are simultaneously added to the water.
  14. In Paragraph 13, A method in which the bromine-based biocide is a non-oxidizing biocide, and the biocide and CDA are formulated in a liquid concentrate fed into an industrial water stream using a single feed solution.
  15. In any one of paragraphs 1 through 3, 5 and 9, A method comprising the step of fighting biofilm bacteria by adding an effective dose of a bromine-based biocide and an enhancement-induced amount of cis-2-decenoic acid to water, thereby achieving a biofilm reduction that is at least 2 log units lower than the reduction achieved by the same dose of the biocide working alone.
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  19. 2 to 35 weight% of 2-bromo-2-nitro-1,3-propanediol; 0.05 to 0.5 weight% of cis-2-decenoic acid; 5.0 to 80.0 weight% of water; Glycol selected from the group consisting of ethylene glycol, propylene glycol and dipropylene glycol monomethyl ether, in an amount of 10 to 70.0 weight%; and 0.05 to 0.5 weight% of antioxidant A liquid concentrate containing
  20. 5 to 25 weight% of 2,2-dibromo-3-nitrilopropionamide; 0.05 to 0.5 weight% of cis-2-decenoic acid; 10 to 60.0 weight% of water; 10 to 60.0 weight% of polyethylene glycol; and 0.05 to 0.5 weight% of antioxidant A liquid concentrate containing

Description

Method and composition for water treatment The present invention relates to the control of microorganisms in water, for example, by using a bromine-based biocide combined with an adjuvant found to enhance the action of the biocide to remove plankton and biofilm bacteria. The use of bromine in industrial water treatment is well established, and various bromine-based biocides are currently available on the market. The operating concentration and frequency of application of biocides depend on the water type, microbial load, organic load, the specific biocide under consideration, and the method of administration. According to one of the inventors [WO 2008/143889 and Journal of Bacteriology 191: 1393-1403 (2009)], cis-2-decenoic acid produced by the bacterium Pseudomonas aeruginosa is P. aeruginosa and others It has been reported that inducing Gram-negative and Gram-positive bacteria and fungi to undergo physiologically-mediated dispersal reactions can lead to the dis-aggregation of surface-associated microbial populations and communities known as biofilms. The control of biofilms constitutes an important aspect of water treatment programs. In US 2009/0178587, the performance of bromine-based biocides in controlling biofilms of P. aruginosa was investigated. Additionally, in US 2009/0178587, it was proposed to increase the efficiency of treatment with the help of surfactants acting as bio-dispersants, but no experimental data was provided to exemplify this approach. The present invention describes the use of cis-2-decenoic acid as an adjunct to bromine-containing biocides in the treatment of biofilms and plankton bacteria in water systems on surfaces in contact with water. Experimental work performed in laboratory models in support of the present invention indicates that the combination of cis-2-decenoic acid and bromine-containing biocides at acceptable working concentrations shows a significant enhancement in bacterial inactivation in both pure cultures and mixed cultures typically found in industrial and natural waters compared to treatment with the biocide alone. Furthermore, the activity of cis-2-decenoic acid in combination with the biocide compound enhances the efficacy of the bromine-containing biocide, thereby enabling a reduction in the effective amount of biocide used. In addition, it is worth noting that the incorporation of cis-2-decenoic acid (CDA) into bromine-based water treatment significantly improves the effectiveness of biofilm control compared to the operation of brominated biocides alone, while a smaller effect is observed in chlorine-based water treatment. For example, under similar conditions, combined bromine/CDA treatment was shown to achieve a biofilm bacteria count approximately 2.5 log units lower than that achieved by chlorine/CDA treatment. Accordingly, the present invention mainly relates to a method for controlling microorganisms in water, comprising the step of adding one or more bromine-based biocides and cis-2-decenoic acid (or a salt thereof) to water to achieve, for example, a reduction of plankton and/or biofilm bacteria, algae and fungi on a surface in contact with water. CDA can be easily incorporated into bromine delivery systems currently used for the treatment of industrial water. For example, bromine-based biocide(s) and CDA can be delivered to an industrial water stream in contact with an infested surface using multiple feed solutions injected sequentially or simultaneously into the water stream, either continuously or in batches; simultaneous injection may involve generating an additive solution (i.e., the CDA and biocide solutions may be mixed before or immediately before being added to the water stream) through the pre-mixing of individual solutions. The selected feeding method also depends on whether the biocide is supplied as a single component or not, as described below. To enable water treatment using a single additive feed instead of multiple additive feeds, the inventors have prepared a liquid concentrate comprising a suitably divided combination of a bromine-based biocide and CDA, which exhibits good storage stability at room temperature. Accordingly, another aspect of the present invention is a composition (e.g., a liquid concentrate) comprising one or more bromine-based biocides and cis-2-decenoic acid in a liquid carrier comprising water, a water-miscible solvent or a mixture thereof, and optionally one or more additive(s), e.g., co-solvent(s), antifreeze(s), and stabilizer(s), e.g., antioxidants. Solid compositions comprising biocides and CDA, e.g., granules, flakes, and tablets, are also considered by the present invention. Bromine-based biocides suitable for use in the present invention are available on the market in different forms, namely, solids (e.g., powders and compacted forms, e.g., granules and tablets) and liquids (e.g., aqueous concentrates or other fluid formulations that can be easily supplied to an aqueous system to be treated). Bromine-b