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

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Laboratory-scale assessment of vacuum-degassed activated sludge for improved settling properties. / Haghighatafshar, Salar; Wilén, Britt-Marie; Thunberg, Andreas; Hagman, Marinette; Nyberg, Annika; Grundestam, Jonas; Mases, Maria; la Cour Jansen, Jes.

I: Environmental Technology, Vol. 38, Nr. 17, 2017, s. 2193-2201.

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Haghighatafshar, Salar ; Wilén, Britt-Marie ; Thunberg, Andreas ; Hagman, Marinette ; Nyberg, Annika ; Grundestam, Jonas ; Mases, Maria ; la Cour Jansen, Jes. / Laboratory-scale assessment of vacuum-degassed activated sludge for improved settling properties. I: Environmental Technology. 2017 ; Vol. 38, Nr. 17. s. 2193-2201.

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TY - JOUR

T1 - Laboratory-scale assessment of vacuum-degassed activated sludge for improved settling properties

AU - Haghighatafshar, Salar

AU - Wilén, Britt-Marie

AU - Thunberg, Andreas

AU - Hagman, Marinette

AU - Nyberg, Annika

AU - Grundestam, Jonas

AU - Mases, Maria

AU - la Cour Jansen, Jes

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

U2 - 10.1080/09593330.2016.1251498

DO - 10.1080/09593330.2016.1251498

M3 - Article

VL - 38

SP - 2193

EP - 2201

JO - Environmental Technology (United Kingdom)

JF - Environmental Technology (United Kingdom)

SN - 1479-487X

IS - 17

ER -