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

Edefell, Ellen LU ; Falås, Per LU ; Kharel, Suman ; Hagman, Marinette LU ; Christensson, Magnus ; Cimbritz, Michael LU and Bester, Kai (2021) In Science of the Total Environment 754.
Abstract

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... (More)

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.

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author
; ; ; ; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Contrast media, MBBR, N-oxides, Organic micropollutants, Ozonation, Transformation products
in
Science of the Total Environment
volume
754
article number
142103
publisher
Elsevier
external identifiers
  • pmid:32920394
  • scopus:85090424542
ISSN
0048-9697
DOI
10.1016/j.scitotenv.2020.142103
language
English
LU publication?
yes
id
e1eb3f39-56b9-419c-9770-9fad9bded6bb
date added to LUP
2020-09-29 13:45:55
date last changed
2024-04-17 15:38:34
@article{e1eb3f39-56b9-419c-9770-9fad9bded6bb,
  abstract     = {{<p>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 O<sub>3</sub> g<sup>−1</sup> 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.</p>}},
  author       = {{Edefell, Ellen and Falås, Per and Kharel, Suman and Hagman, Marinette and Christensson, Magnus and Cimbritz, Michael and Bester, Kai}},
  issn         = {{0048-9697}},
  keywords     = {{Contrast media; MBBR; N-oxides; Organic micropollutants; Ozonation; Transformation products}},
  language     = {{eng}},
  month        = {{02}},
  publisher    = {{Elsevier}},
  series       = {{Science of the Total Environment}},
  title        = {{MBBRs as post-treatment to ozonation : Degradation of transformation products and ozone-resistant micropollutants}},
  url          = {{http://dx.doi.org/10.1016/j.scitotenv.2020.142103}},
  doi          = {{10.1016/j.scitotenv.2020.142103}},
  volume       = {{754}},
  year         = {{2021}},
}