PITCHER FILTERS FOR REDUCING FREE CHLORINE IN TAP WATER

The main method of water disinfection was and remains chlorination. It has a number of positive properties, such as long-term efficiency, fast action and a small dose of the reagent consumed. Due to the long period of water transportation to the consumer, chlorination, due to its aftereffect, is a mandatory and necessary method of water treatment. At the same time, it has such negative sides as the formation of trihalomethanes, such as chloroform, bromoform, dibromochloromethane and others, which in turn are recognized by WHO as potentially dangerous to public health. In addition, when boiling, excess chlorine in tap water can form dioxins - the strongest poisons. From this it follows that the conclusion that chlorinated tap water requires additional purification before drinking. Recently, household jug-type filters have proven themselves well, based on the adsorption capacity of carbon sorbent to retain various ions. In this regard, the aim of the work was to study the efficiency of pitcher filters in relation to reducing the content of residual free chlorine using samples of tap water from different areas of Kazan as an example. Samples of tap water from different areas of Kazan were taken for the experiment. The content of residual free chlorine was determined according to the method of GOST 18190-72 using titration with methyl orange on the TitroLine 5000 device. The results obtained allowed us to establish that the use of pitcher filters in relation to free residual chlorine is effective and appropriate, since it allows reducing the content of the latter by 10-45%.