The Influence of the Removal of Specific NOM Compounds by Anion Exchange on Ozone Demand, Disinfection Capacity, and Bromate Formation

Abstract

This research on a pilot scale focuses on the reaction of ozone with natural organic matter (NOM) for three water qualities with different dissolved organic carbon (DOC) concentrations and NOM compositions, obtained after several stages of an anion exchange process. It was shown that for the same ozone dosage per DOC, the ozone demand was higher, less bromate was formed and a lower disinfection capacity was reached for water containing mainly humic substances, than for water where the humic substances were partly removed. It can be concluded that NOM composition, specifically the humic substances, influences the ozone demand, disinfection capacity and bromate formation.

Keywords:

• Ozone
• Natural Organic Matter
• Anion Exchange
• Ozone Demand
• Disinfection Capacity
• Bromate Formation
• Drinking Water Quality

ACKNOWLEDGMENTS

This study was part of a project about natural organic matter (NOM) in drinking water distribution networks. Subsidy for the NOM project was provided by Senter Novem. The project is a joint research project of KWR Watercycle research institute, UNESCO-IHE, Delft University of Technology, the water supply Companies Vitens and Waternet, water cycle company for Amsterdam and surrounding areas.