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Laboratory-scale assessment of vacuum-degassed activated sludge for improved settling properties

Haghighatafshar, Salar LU ; Wilén, Britt-Marie; Thunberg, Andreas; Hagman, Marinette LU ; Nyberg, Annika; Grundestam, Jonas; Mases, Maria and la Cour Jansen, Jes LU (2016) In Environmental Technology
Abstract
Vacuum degassing of activated sludge was tested at eight different Swedish wastewater treatment plants with laboratory-scale equipment in batch mode in order to evaluate its efficiency on improvement of sludge compaction and settling properties. The results show that the efficiency of the degassing technique is mainly dependent on the initial sludge volume index (SVI) of the target sludge which was found to be related to its process configuration. Facilities with full activated sludge-based nitrogen removal processes, including both nitrification and denitrification, had high SVIs (>300 mL g-1) and were strongly affected by vacuum degassing with reduction of SVI up to 30%. Nitrogen removal facilities also including biological... (More)
Vacuum degassing of activated sludge was tested at eight different Swedish wastewater treatment plants with laboratory-scale equipment in batch mode in order to evaluate its efficiency on improvement of sludge compaction and settling properties. The results show that the efficiency of the degassing technique is mainly dependent on the initial sludge volume index (SVI) of the target sludge which was found to be related to its process configuration. Facilities with full activated sludge-based nitrogen removal processes, including both nitrification and denitrification, had high SVIs (>300 mL g-1) and were strongly affected by vacuum degassing with reduction of SVI up to 30%. Nitrogen removal facilities also including biological phosphorus removal showed better compaction and settling properties with relatively lower SVIs and were affected to a lesser extent by degassing with SVI reduction of 10–20%. Wastewater treatment plants without full biological nitrogen removal, lacking either nitrification or denitrification (or both) processes in the activated sludge had the lowest SVIs observed with almost no effect of vacuum degassing. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
in
Environmental Technology
pages
9 pages
publisher
Selper Ltd
external identifiers
  • scopus:84994102586
  • wos:000406560200009
ISSN
1479-487X
DOI
10.1080/09593330.2016.1251498
language
English
LU publication?
yes
id
dad6c57a-7cd9-4ef4-a82b-f7cfab121961
date added to LUP
2016-11-03 13:58:34
date last changed
2017-09-18 11:29:08
@article{dad6c57a-7cd9-4ef4-a82b-f7cfab121961,
  abstract     = {Vacuum degassing of activated sludge was tested at eight different Swedish wastewater treatment plants with laboratory-scale equipment in batch mode in order to evaluate its efficiency on improvement of sludge compaction and settling properties. The results show that the efficiency of the degassing technique is mainly dependent on the initial sludge volume index (SVI) of the target sludge which was found to be related to its process configuration. Facilities with full activated sludge-based nitrogen removal processes, including both nitrification and denitrification, had high SVIs (&gt;300 mL g<sup>-1</sup>) and were strongly affected by vacuum degassing with reduction of SVI up to 30%. Nitrogen removal facilities also including biological phosphorus removal showed better compaction and settling properties with relatively lower SVIs and were affected to a lesser extent by degassing with SVI reduction of 10–20%. Wastewater treatment plants without full biological nitrogen removal, lacking either nitrification or denitrification (or both) processes in the activated sludge had the lowest SVIs observed with almost no effect of vacuum degassing.},
  author       = {Haghighatafshar, Salar and Wilén, Britt-Marie and Thunberg, Andreas and Hagman, Marinette and Nyberg, Annika and Grundestam, Jonas and Mases, Maria and la Cour Jansen, Jes},
  issn         = {1479-487X},
  language     = {eng},
  month        = {11},
  pages        = {9},
  publisher    = {Selper Ltd},
  series       = {Environmental Technology},
  title        = {Laboratory-scale assessment of vacuum-degassed activated sludge for improved settling properties},
  url          = {http://dx.doi.org/10.1080/09593330.2016.1251498},
  year         = {2016},
}