MBBRs as post-treatment to ozonation: Degradation of transformation products and ozone-resistant micropollutants

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The degradation potential of micropollutants and transformation products in biological post-treatment after ozonation is partly unknown. A pilot plant with ozonation and subsequent biological treatment in a moving bed biofilm reactor (MBBR) was thus operated over 16 months to investigate the removal of micropollutants and the formation and removal of N-oxide transformation products. Lab-scale kinetic experiments were performed in parallel. At a moderate ozone dose of 0.5 g O3 g−1 DOC, further degradation of gabapentin and 3 iodinated contrast media (iomeprol, iopamidol, and iohexol) could be induced by the biofilm at prolonged exposure times. To facilitate comparison of feeding regimens in biofilm systems a new surface-related degradation rate constant was introduced. The availability of substrates in the pilot MBBR influenced the micropollutant degradation kinetics with increasing and decreasing degradation rates. N-oxides from erythromycin, clarithromycin, tramadol, and venlafaxine were formed during ozonation and could not be degraded by the biofilm.


Enheter & grupper
Externa organisationer
  • Aarhus University
  • Sweden Water Research AB
  • Veolia Water Technologies AB

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Vattenbehandling


TidskriftScience of the Total Environment
StatusPublished - 2021 feb 1
Peer review utfördJa