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Impact of activated sludge ozonation on filamentous bacteria viability and possible added benefits

Nilsson, Filip LU ; Davidsson, Åsa LU ; Falås, Per LU ; Bengtsson, Simon; Bester, Kai and Jönsson, Karin LU (2018) In Environmental Technology
Abstract (Swedish)
Ozone was applied to return activated sludge in full-scale to study how ozone impacts filamentous bacteria viability (Live/Dead®). Additionally, the ozonated sludges were subjected to anaerobic digestion trials and analysis of micropollutants. Ozone treatment (3-4.8 g O3/kg TSS) improved the settling properties of the sludge by lowering the diluted sludge volume with 7-35%. Ozone inactivated filamentous bacteria outside the floc structures and the fraction of inactivated filaments increased with an increasing ozone dose. It was observed that ozone treatment may act selectively towards different types of filaments. With respect to the two dominating morphotypes present, Type 0041 filamentous bacteria were found to be more resistant to ozone... (More)
Ozone was applied to return activated sludge in full-scale to study how ozone impacts filamentous bacteria viability (Live/Dead®). Additionally, the ozonated sludges were subjected to anaerobic digestion trials and analysis of micropollutants. Ozone treatment (3-4.8 g O3/kg TSS) improved the settling properties of the sludge by lowering the diluted sludge volume with 7-35%. Ozone inactivated filamentous bacteria outside the floc structures and the fraction of inactivated filaments increased with an increasing ozone dose. It was observed that ozone treatment may act selectively towards different types of filaments. With respect to the two dominating morphotypes present, Type 0041 filamentous bacteria were found to be more resistant to ozone attack than Mictrothrix parvicella. Thus, higher ozone doses may be required to mitigate sludge bulking caused by Type 0041 filaments. No effects could be discerned by ozone addition on neither the methane production of the sludge nor on the concentrations of micropollutants analysed for this study. The lack of effect on both methane production and micropollutant removal was deemed to be caused by insufficient ozone doses. (Less)
Abstract
Ozone was applied to return activated sludge in full-scale to study how ozone impacts filamentous bacteria viability (Live/Dead®). Additionally, the ozonated sludges were subjected to anaerobic digestion trials and analysis of micropollutants. Ozone treatment (3-4.8 g O3/kg TSS) improved the settling properties of the sludge by lowering the diluted sludge volume with 7-35%. Ozone inactivated filamentous bacteria outside the floc structures and the fraction of inactivated filaments increased with an increasing ozone dose. It was observed that ozone treatment may act selectively towards different types of filaments. With respect to the two dominating morphotypes present, Type 0041 filamentous bacteria were found to be more resistant to ozone... (More)
Ozone was applied to return activated sludge in full-scale to study how ozone impacts filamentous bacteria viability (Live/Dead®). Additionally, the ozonated sludges were subjected to anaerobic digestion trials and analysis of micropollutants. Ozone treatment (3-4.8 g O3/kg TSS) improved the settling properties of the sludge by lowering the diluted sludge volume with 7-35%. Ozone inactivated filamentous bacteria outside the floc structures and the fraction of inactivated filaments increased with an increasing ozone dose. It was observed that ozone treatment may act selectively towards different types of filaments. With respect to the two dominating morphotypes present, Type 0041 filamentous bacteria were found to be more resistant to ozone attack than Microthrix parvicella. Thus, higher ozone doses may be required to mitigate sludge bulking caused by Type 0041 filaments. No effects could be discerned by ozone addition on neither the methane production of the sludge nor on the concentrations of micropollutants analysed for this study. The lack of effect on both methane production and micropollutant removal was deemed to be caused by insufficient ozone doses. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
in
Environmental Technology
pages
11 pages
publisher
Selper Ltd
external identifiers
  • scopus:85043704370
ISSN
1479-487X
DOI
10.1080/09593330.2018.1447023
language
English
LU publication?
yes
id
d431abfb-2717-451e-bc59-65445b2cc85f
date added to LUP
2017-12-14 12:16:37
date last changed
2019-02-20 11:01:01
@article{d431abfb-2717-451e-bc59-65445b2cc85f,
  abstract     = {Ozone was applied to return activated sludge in full-scale to study how ozone impacts filamentous bacteria viability (Live/Dead®). Additionally, the ozonated sludges were subjected to anaerobic digestion trials and analysis of micropollutants. Ozone treatment (3-4.8 g O3/kg TSS) improved the settling properties of the sludge by lowering the diluted sludge volume with 7-35%. Ozone inactivated filamentous bacteria outside the floc structures and the fraction of inactivated filaments increased with an increasing ozone dose. It was observed that ozone treatment may act selectively towards different types of filaments. With respect to the two dominating morphotypes present, Type 0041 filamentous bacteria were found to be more resistant to ozone attack than Microthrix parvicella. Thus, higher ozone doses may be required to mitigate sludge bulking caused by Type 0041 filaments. No effects could be discerned by ozone addition on neither the methane production of the sludge nor on the concentrations of micropollutants analysed for this study. The lack of effect on both methane production and micropollutant removal was deemed to be caused by insufficient ozone doses.},
  author       = {Nilsson, Filip and Davidsson, Åsa and Falås, Per and Bengtsson, Simon and Bester, Kai and Jönsson, Karin},
  issn         = {1479-487X},
  language     = {eng},
  month        = {03},
  pages        = {11},
  publisher    = {Selper Ltd},
  series       = {Environmental Technology},
  title        = {Impact of activated sludge ozonation on filamentous bacteria viability and possible added benefits},
  url          = {http://dx.doi.org/10.1080/09593330.2018.1447023},
  year         = {2018},
}