SU884561A3 - Method of preventing bacteria and alga growth - Google Patents

Description

This invention relates to methods for preventing the growth of bacteria and algae in swimming pool water. Swimming pool water is circulated backwardly and only to maintain the required volume in the pool it is usually replenished with fresh water. To clean the suspended material, water continuously filters with and yet it is constantly subjected to contamination with algae and bacteria, and therefore, for hygienic reasons, additional treatment is required to prevent such contamination. There is a known method for preventing the growth of bacteria and algae in the water of pools by introducing the organic compound ", (CH)), where R is the radical of acrylic with carbon atoms 8-18; Rj is a ethylene or propylene radical; R is the radical of acrylic with atoms in Lerod 1-5, n 1, 2 or H. However, this method does not completely prevent the growth of bacteria and algae. Thus, the number of, for example, fallen cells is 3x10, i.e. about 300 colonies on nutrient agar plate. The purpose of the invention is to increase the efficiency of the process. The goal is achieved by introducing polymeric biguanide or its salts with the general formula -X-M "-C-Sh-C.-S" -Y-NW-c-NH-H II, as the organic compound. S “. "N. where X and y are polymethylene chains, possibly interrupted by oxygen, sulfur or nitrogen, or groups containing saturated or unsaturated cyclic nuclei. The polymer chains of the biguanide, at one or both ends, are obtained by the NHR group, where R is an alkyl group containing from 1 to 18 carbon atoms / Hexamethylene biguanide with an average modular weight from 1100 to 1800 is used as the polymeric biguanide. following formula

ON-N4-C-NH-X- -NH-t-H-CN IIII

e diamine H N-Y-NHj, in which X and Y have the above value.

Are polymer chains terminated by a 60-amino hydrochloride group, or by an -MH-c-NH-CN group, with the resulting

NH

the groups may be the same or different in each polymer chain.

A small amount of the primary amine R-NHj in which R is an alkyl group containing from 1 to 18 carbon atoms can be used in the preparation of polymeric biguanides together with the diamine I M - y - N H PI.

. It should be borne in mind that polymeric bigu anides are obtained in the form of polymer chains of various lengths, the number of individual units of the biguanide, i.e.

 C-MN-C-W-VI-H-NH-C-W-C-- 1 H11 and U U

yes nn nn mn

ranges from 3 to about 80.

Hexamethylene of a biguanide having the formula

- 1 (СНл), - NH-С - NH-С-NHl ° And II 1 L NH NH Jn

where n is from 6 to 10, and the average molecular weight of the polymer mixture is from 1100 to 1800.

Polymer biguanides have strongly antibacterial properties and inhibit the growth of fungi. Until now, however, their effectiveness in preventing algae growth in water has not been known. It has been established that a single treatment of swimming pool water with polymeric biguanide of the described concentration can effectively prevent the growth of bacteria and algae during the whole season — 9 months or even more.

The concentration of polymeric biguanide or its salt in 4-12 ppm is effective. However, it should be borne in mind that the duration of the maintenance of effective concentration depends on the number of people using the swimming pool. In case of many months of operation of the basin, it may be necessary to maintain the indicated effective concentration level, a second or even one third; treatment. The concentration should not be less than 4 ppm.

Example 1. An outdoor swimming pool with a surface area of 50 c and a capacity of 13,500 gallons (61 m) is treated with hexamethylene biguanide hydrochloride, which is used in the form of -20 wt.% Aqueous solution.

:: bringing the concentration of the active substance to 10 ppm. During the year - from September to September - checks were made. During the period from May to September, when the pool was used by 237 people,. experiments were performed to determine the presence of algae and certain pathogenic bacteria. Water temperature ranged from 21 to. In mid-June, the content of polymeric biguanide in water decreased to 2 ppm, and another 8 ppm of the preparation was added to the pool in order to bring it to its original level (10 ppm).

No algae growth was observed during the experiments, neither coliform bacteria (including E. coli) or staphylococci were detected. Samples of 100 ml were taken weekly.

Example 2. A indoor swimming pool with a surface area of 50 m and a capacity of 15,000 gallons (6.8 m) is treated with hexamethylene by a biguanide used in wt.% Aqueous solution to form an active substance concentration of 10 ppm in water. For three months - from May to August - at a temperature of 17 degrees and the use of the pool, 420 people assessed water quality. During the experiments, algae growth was not observed and no coliforms were detected (including E. coli). bacteria or staphylococci. The number of surviving cells is 10.

Claims (3)

1. A method for preventing the growth of bacteria and algae in the pool water by introducing an organic compound, characterized in that, in order to increase the efficiency of the process, polymeric biguani or its salt of the general formula is introduced as an organic compound -X-NH C-W-t-1 "-U-MN-C-NH-D-t H-. m 111 N t w nh nh where X and Y are polymethylene chains, possibly interrupted by oxygen, sulfur or nitrogen, or groups containing saturated or unsaturated cyclic nuclei, c. 4-12 ppm 2. A process according to claim 1, wherein the polymer chains of the biguanide are terminated at one or both ends with an NHR group, where R is an alkyl group containing from 1 to 1 carbon atoms. 58845616 3. The way pop.1 and 2, otli- Sources of information This is due to the fact that hexamethylene biguanide with a medium molecule i is used as {taken into account in the examination of the polymer biguanide. German patent 1229919, pryny weight from 1100 to 1800. (El. 85 in, 1 1966.