Occurrence of emerging pollutants in urban wastewater and their removal through biological treatment followed by ozonation

The results showed that paraxanthine, caffeine and acetaminophen were the main individual pollutants usually found in concentrations over 20 ppb

Roberto Rosal

2009

Scholarcy highlights

  • This work reports a systematic survey of over seventy individual pollutants in a Sewage Treatment Plant receiving urban wastewater
  • The quantification in the ng/L range was performed by Liquid Chromatography–QTRAP–Mass Spectrometry and Gas Chromatography coupled to Mass Spectrometry
  • The results showed that paraxanthine, caffeine and acetaminophen were the main individual pollutants usually found in concentrations over 20 ppb
  • A group of compounds including the beta-blockers atenolol, metoprolol and propanolol; the lipid regulators bezafibrate and fenofibric acid; the antibiotics erythromycin, sulfamethoxazole and trimethoprim, the antiinflammatories diclofenac, indomethacin, ketoprofen and mefenamic acid, the antiepileptic carbamazepine and the antiacid omeprazole exhibited removal efficiencies below 20% in the STP treatment
  • Ozonation with doses lower than 90 μM allowed the removal of many individual pollutants including some of those more refractory to biological treatment
  • The results show that the hydroxyl radical reaction was the major pathway for the oxidative transformation of these compounds

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