Authors: Urška Rozman, Tanja Kontič , Nataša Uranjek , Sonja Šostar Turk
Correspondin author: Urška Rozman
Type of paper: Original scientific article
Issue: Volume 15 | number 1 – 2022
Chlorination is one of the most commonly used procedures for drinking water disinfection. The research aimed to soptimise the subsequent disinfection of drinking water with chlorine in the water supply network in the city Velenje, taking into account the applicable legislation. The gradual reduction of chlorine dosage was implemented with simultaneous monitoring of selected physico-chemical and microbiological parameters of drinking water. During the two-month period, 418 samples were taken at 22 previously defined different sampling spots. Free chlorine values were reduced from the initial 0,18 mg/L to the final 0,08 mg/L at the outlet, while values at some remote sampling sites reached only 0,01 mg/L of free chlorine. Microbiological analyses of samples showed that the drinking water met the limit values in the regulations, despite the low values of free chlorine. Based on the results, a modified chlorination of drinking water was introduced in the tested supply area, and the introduction of a similar regime in other supply areas is being actively considered. In this way, we reduce the consumption of disinfectants and ensure the supply of quality and healthy drinking water to consumers.
Key words: drinking water, chlorination optimisation, microbiological parameters, Slovenia – Velenje.