Laboratory studies on the effect of ozonation on THM formation in swimming pool water

Kamilla Marie Speht Hansen, Aikaterini Spiliotopoulou, Waqas Akram Cheema, Henrik Rasmus Andersen

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    Water samples from indoor swimming pool were ozonated at different pH values to evaluate the effect of pH on decomposition of ozone in swimming pool water. Furthermore, drinking and pool water were repeatedly ozonated followed by chlorination to evaluate THM formation. Decomposition of ozone was not affected by pH in the range relevant to swimming pools (pH 6.8 – 7.8) and a half-life time at 10-12 min was obtained. Repeating the ozonation, the decomposition of ozone increased at the second dose of ozone added (t½,2=8 min) and then decreased again at the third and fourth dose of ozone (t½,3=17 min; t½,4=18 min). For drinking water, ozone decomposition was fast for the first dose of ozone (t½,1=4 min) and then decreased for the second and third dose of ozone (t½,2=19 min; t½,3=17 min). Chlorination after ozonation revealed that ozone removed reactivity of the dissolved organic carbon toward chlorine for drinking water as lower TTHM formation occurred than in non-ozonated samples. For pool water, a higher TTHM formation was observed in ozonated than non-ozonated pool water. Thus, it was observed that ozone reacts markedly different in swimming pool water from the known pattern in drinking water production.
    Original languageEnglish
    Title of host publicationProceedings of the 6th International Conference on Swimming Pool and Spa
    Number of pages6
    Publication date2015
    Publication statusPublished - 2015
    Event6th International Conference Swimming Pool & Spa - Amsterdam, Netherlands
    Duration: 17 Mar 201520 Mar 2015
    Conference number: 6


    Conference6th International Conference Swimming Pool & Spa
    Internet address


    • Swimming pool
    • Ozonation
    • DIN
    • Trihalomethane


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