DOI 10.35776/MNP.2020.04.03
UDC 628.14:628.16.094.413.094.3

Methods of supplementary chlorination in the long sections
of the water mains in Novokuznetsk

Summary

According to SanPiN 2.1.4.1074-01, while supplying water to the distribution network, the concentration of residual free chlorine in it should be from 0.3 to 0.5 mg/l, and that of residual combined chlorine – from 0.8 to 1.2 mg/l; in the distribution network, the concentration of residual free chlorine is not regulated; however, the quality of drinking water should be epidemically safe. To address this problem, the specialists of the chief process engineer department at Vodokanal LLC studied the technologies of supplementary chlorination in the water transportation system at one or several stages, and of chlorammoniation at the water treatment facilities. It has been established that chlorammoniation provides for a prolonged action of chlorine in water and prevents the formation of carcinogens. However, after the introduction of ammonia, a foreign odor and aftertaste (pharmaceutical, medicinal) appeared in all analyzed samples. It was experimentally proved that during chlorammoniation in summer during hot periods and with the presence of foreign moldy odor in the river water, ammoniation did not either prevent or reduce the intensity of foreign odor and aftertaste in drinking water. Various technologies of supplementary chlorination in the water transportation system were studied and local supplementary chlorination of drinking water by membrane electrolysis was recommended.

Key words

chlorammoniation , residual chlorine , membrane electrolyzer , supplementary chlorination , water odor and aftertaste