Abstract
Conventional drinking water treatment is inefficient in removing a large fraction of known organic micropollutants (OMPs). Ozonation in combination with granular activated carbon is a promising approach for addressing this issue.
Highlights
PaperEnvironmental Science: Water Research & Technology guidelines,[7,8] drinking water producers face increasing expectations to deliver water that has been treated with techniques known to be efficient in removal of organic micropollutants (OMPs)
This study evaluated the behaviour of OMPs and dissolved organic carbon (DOC) in a long-term combined pilot-scale ozonation and granular activated carbon filters (GAC) filtration treatment experiment, while recording detailed data on natural organic matter (NOM) composition using liquid chromatography with organic carbon detection (LC-OCD) and ultraviolet (UV) absorbance
The GAC filter was principally acting as a biological activated carbon (BAC) filter at the time of sampling, mainly protecting against taste and odour compounds, which are known to be effectively reduced in drinking water by either fresh or mature biologically active GAC filters.[42,50]
Summary
PaperEnvironmental Science: Water Research & Technology guidelines,[7,8] drinking water producers face increasing expectations to deliver water that has been treated with techniques known to be efficient in removal of OMPs. As GAC materials have broad-spectrum adsorption properties, it is likely that a large fraction of transformation products in the feed water can be removed These characteristics make combined ozonation and GAC filtration a promising, powerful and safe treatment of raw or partially treated water and is one of the most promising tools for water reuse.[28] As many transformation products have high polarity, making them relatively mobile and resulting in early breakthrough in GAC,[27,29] it is important to utilize new (or recently regenerated) GAC filter when used in combination with ozone. This study evaluated the behaviour of OMPs and DOC in a long-term combined pilot-scale ozonation and GAC filtration treatment experiment, while recording detailed data on NOM composition using liquid chromatography with organic carbon detection (LC-OCD) and ultraviolet (UV) absorbance. The primary objective was to determine how OMPs are removed by ozonation and GAC with respect to NOM adsorption competition, in a complex dynamic system with natural water and ambient low OMP concentrations
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