Evaluation of a membrane bioreactor system as post-treatment waste water treatment for better removal of micropollutants

Sonia Arriaga, Nadieh de Jonge, Marc Lund Nielsen, Henrik Rasmus Andersen, Vibeke Borregaard, Kevin Jewel, Thomas Ternes, Jeppe Lund Nielsen

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Organic micropollutants such as pharmaceuticals are persistent pollutants that are only partially degraded in waste water treatment plants (WWTPs). In this study, a membrane bioreactor (MBR) system was used as a polishing step on a full-scale WWTP, and its ability to remove micropollutants was examined together with the development and stability of the microbial community. Two stages of operation were studied during a period of 9 months, one with (S1) and one without (S2) the addition of exogenous organic micropollutants. Ibuprofen and naproxen had the highest degradation rates with values of 248 μg/gVSS·h and 71 μg/gVSS·h, whereas diclofenac was a more persistent OMP (7.28 μg/gVSS·h). Mineralization of 14C-labeled organic micropollutants' in batch kinetic experiments indicates that higher removal rates (∼0.8 ng/mgSS·h) with a short lag phase can be obtained when artificial addition of organic micropollutants was performed. Similar microbial populations dominated S1 and S2, despite the independent operations. Hydrogenophaga, Nitrospira, p55-a5, the actinobacterial Tetrasphaera, Propionicimonas, Fodinicola, and Candidatus Microthrix were the most abundant groups in the polishing MBR. Finally, potential microbial candidates for ibuprofen and naproxen degradation are proposed.
Original languageEnglish
JournalWater Research
Volume107
Pages (from-to)37-46
ISSN0043-1354
DOIs
Publication statusPublished - 2016

Keywords

  • Membrane reactor
  • Polishing step
  • Emerging organic
  • Micropollutants

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