Removal of pharmaceuticals, toxicity and natural fluorescence by ozonation in biologically pre-treated municipalwastewater, in comparison to subsequent polishing biofilm reactors

Kai Tang, Gordon Tze Hoong Ooi, Aikaterini Spiliotopoulou, Kamilla Marie Speht Kaarsholm, Kim Sundmark, Bianca Florian, Caroline Kragelund, Kai Bester, Henrik Rasmus Andersen*

*Corresponding author for this work

    Research output: Contribution to journalJournal articleResearchpeer-review

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    Abstract

    Ozonation followed by a polishing moving bed biofilm reactor (MBBR) was implemented in pilot and laboratory to remove the residual pharmaceuticals and toxicity from wastewater effluent, which was from a pilot hybrid system of MBBR and activated sludge, receiving municipal wastewater. The delivered ozone dosages achieving 90% pharmaceutical removal were determined both in pilot and laboratory experiments and they were normalised to dissolved organic carbon (DOC), illustrating our findings were comparable with previously published literature. During wastewater ozonation, the intensity of natural fluorescence was found to be greatly associated with the concentrations of the studied pharmaceuticals. In pilot experiments, toxicity, measured by Vibrio fischeri, increased after ozonation at delivered ozone dosages at 0.38-0.47 mg O3/mg DOC and was completely removed by the subsequent polishing MBBR. Laboratory experiments verified that the polishing MBBR was able to remove the toxicity produced by the ozonation.

    Original languageEnglish
    Article number1059
    JournalWater (Switzerland)
    Volume12
    Issue number4
    ISSN2073-4441
    DOIs
    Publication statusPublished - 2020

    Keywords

    • Fluorescence
    • Municipal wastewater
    • Ozonation
    • Pharmaceuticals
    • Toxicity

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