Abstract
This researched focused on improving drinking water quality, specifically the biological stability of the produced drinking water. Natural organic matter (NOM) can be a source of nutrients for bacteria present in the distribution system, which can cause regrowth. Specifically, small organic acids can cause bacterial activity in the distribution system and biofilm formation in pipelines can occur. Microbial regrowth can deteriorate the taste and odour of the drinking water and it can even lead to potential health hazards. The biological stability of the treated water is negatively influenced by the presence of certain NOM fractions and therefore, specific NOM fractions should be removed, which can be done by anion exchange (IEX) resins. However, the removal and conversion of specific NOM fractions is not well understood. Therefore, knowledge about NOM fractions as well as their behaviour in water treatment processes is essential. From this research can be concluded that anion exchange is a good and cost-effective way to remove NOM. Liquid chromatography with organic carbon detection (LC-OCD) has shown to be a useful method for NOM characterisation. IEX removed specifically humic acids, which is also the main fraction reacting with ozone resulting in small organic acids. Thus, extension of the treatment lane with IEX before ozonation improves the biological stability of the produced water.
Published Version
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