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A synergistic biocide and process for controlling growth of microorganisms

A microbial, water control technology, applied in the direction of biological control chemicals, plant growth regulators, botanical equipment and methods, etc., can solve the problems of high volatility and odor, use, etc.

Inactive Publication Date: 2008-10-29
SOLENIS TECH CAYMAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Dichloroamines are reported to be excellent disinfectants but have negative properties such as high volatility and odor
[0021] Although chloramine is widely practiced for treating municipal water distribution systems, it is not typically used in industrial systems

Method used

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  • A synergistic biocide and process for controlling growth of microorganisms
  • A synergistic biocide and process for controlling growth of microorganisms
  • A synergistic biocide and process for controlling growth of microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0091] A measured amount of monochloramine and a measured amount of dichloramine are added to the bacterial suspension and the cell suspension incubated for a certain period of time. The efficacy of the antimicrobial mixture was determined by measuring its growth or loss after an additional appropriate incubation time. This sample demonstrates synergistic activity between monochloroamine and dichloroamine on artificial bacterial consortia in synthetic white water at pH 5.5 and 8.0 under a simultaneous feeding strategy. A synergy index value of <1.00 indicates a synergistic effect of the two active substances.

[0092] Table 1 Synergy index of mixtures of monochlorinated and dichlorinated amines

[0093]

[0094]

[0095] Table 1 shows the synergy between monochloroamines and dichloroamines. This synergy is affected by pH. For example, the synergistic ratio of monochloroamine and dichloroamine is broader at pH 8 than at pH 5. At higher pH, the ratio of monochloroamine...

Embodiment 2

[0097] In this example, a measured amount of monochloramine and a measured amount of dichloramine were added to a prepared density of about 1×10 6 cells per milliliter of the bacterial consortium and incubate the cell suspension for a certain period of time. The bacterial consortium is as described above. The efficacy of the antimicrobial mixture was determined by measuring the number of surviving bacteria after the contact time. The efficacy of monochloramine, dichloramine and mixtures of these two active substances was compared at different pH values. Bacterial consortiums are prepared in inorganic salt solutions, pH adjusted to a selected value, and immunized with monochloramines and dichloramines and combinations thereof. Samples were collected at regular intervals to count the number of surviving bacteria.

[0098] Table 2 Number of surviving bacteria after 20 minutes of contact with monochloramine (MCA), dichloramine (DCA) and mixtures thereof. Quantity is log 10 tr...

Embodiment 3

[0102] Although synergy was detected when monochloramine and dichloramine were mixed in a 1:1 ratio, the results of Example 1 indicated that the optimal ratio was greater than 1:1 (monochloramine:dichloramine). In this example, the bacterial consortium was prepared by adjusting the pH of the inorganic salt solution to a selected level immediately prior to the addition of the cells. By mixing appropriate amounts of 30% ammonium hydroxide and 6.2% sodium hypochlorite in a volume of deionized water to obtain an equimolar ratio of Cl - and NH 2 + to prepare the desired concentration of monochloramine. After preparing the monochloramine solution, its purity was checked by measuring the absorption spectrum of the solution. To prepare the dichloroamine solution, adjust the pH of the monochloramine solution to below 3.0. This ensures the conversion of monochlorinated amines to dichloroamines. The spectral characteristics of the dichloroamine solution indicated that the pH drop of...

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Abstract

Synergistic mixtures of haloamines and their use to control the growth of microorganisms in aqueous systems are disclosed. The method of using the synergistic mixtures entails adding an effective amount of a monohaloamine and an effective amount of a dihaloamine to an aqueous system. The ratio of monohaloamine to dihaloamine is selected to result in a synergistic biocidal effect.

Description

technical field [0001] The present invention relates to synergistic mixtures of haloamines and their use to control the growth of microorganisms in aqueous systems, more particularly in industrial process waters. Background technique [0002] Uncontrolled growth of microorganisms in industrial manufacturing systems can have serious consequences such as reduced product quality, product degradation or spoilage damage, product contamination, and disruption of a wide range of important industrial manufacturing processes. The growth of microorganisms on surfaces exposed to water (e.g., recirculation systems, heat exchangers, once-through heating and cooling systems, pulp and paper processing systems, etc.) can be particularly problematic since many of these systems provide An environment suitable for the growth of bacteria and other types of microorganisms. Industrial preparation water often provides temperature, nutrients, pH and other conditions that allow the growth of microo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01N59/00A01N33/14A61L2/18A01P1/00C02F1/76
Inventor M·J·迈耶F·L·辛格尔顿
Owner SOLENIS TECH CAYMAN
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