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УДК 628.166

Platonov M. M., Kochelaeva G. A.

Optimization of drinking water chlorammoniation process

Summary

Water disinfection is the most important function of the public water supply. Chlorammoniation used for this purpose has a number of advantages compared to the traditional chlorination. However, it sets raised requirements to the analytical control instruments which limit the automation potential. Different control parameters are considered in relation to their possible application for the automation of the disinfection process. It is shown that the best parameter indicative of the optimal conditions of the process is the concentration of free ammonium. To choose a method of measuring free ammonium under the conditions of chlorammoniation at the existing water supply facilities tests on monitoring free ammonium by different methods were carried out. The limitations of some laboratory techniques are shown together with the advantages of the method using a gas-selective electrode, particularly in automatic analysis. The method of free ammonium monitoring with the use of an automatic analyzer with a gas-selective electrode has a number of advantages: a clear criterion of the optimal process conditions; the lowest absolute error of the measurements; possible use of the method for the automation of chlorine (ammonium) dosing. The operational tests showed the efficiency of the given method of the process control, reliable operation of the analyzer and good repeatability in relation to the laboratory data.

Key words

water disinfection , chlorammoniation , free ammonium , gas-selective electrode , automatic analysis