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Effect of solids retention time and wastewater characteristics on biological phosphorus removal

Henze, M; Aspegren, H; la Cour Jansen, Jes LU ; Nielsen, PH and Lee, N (2002) In Water Science and Technology 45(6). p.137-144
Abstract
The paper deals with the effect of wastewater, plant design and operation in relation to biological nitrogen and phosphorus removal and the possibilities to model the processes. Two Bio-P pilot plants were operated for 2.5 years in parallel receiving identical wastewater. The plants had SRT of 4 and 21 days, the latter had nitrification and denitrification. The plant with 4 days SRT had much more variable biomass characteristics, than the one with the high SRT. The internal storage compounds, PHA, were affected significantly by the concentration of fatty acids or other easily degradable organics in the wastewater, and less by the plant lay-out. The phosphorus removal is mainly dependent on availability in the wastewater of fatty acids but... (More)
The paper deals with the effect of wastewater, plant design and operation in relation to biological nitrogen and phosphorus removal and the possibilities to model the processes. Two Bio-P pilot plants were operated for 2.5 years in parallel receiving identical wastewater. The plants had SRT of 4 and 21 days, the latter had nitrification and denitrification. The plant with 4 days SRT had much more variable biomass characteristics, than the one with the high SRT. The internal storage compounds, PHA, were affected significantly by the concentration of fatty acids or other easily degradable organics in the wastewater, and less by the plant lay-out. The phosphorus removal is mainly dependent on availability in the wastewater of fatty acids but also by the suspended solids in the effluent, which is higher in the plant with nitrification-denitrification, probably due to a higher SVI or denitrification in the settler. The addition of glucose to the influent seems to have an effect on the performance of the plants similar to that of acetic acid. In spite of great load variations over time to the pilot plants and the different operational modes, the study of population dynamics showed less significant variations with time which has importance in relation to modelling. The overall conclusion of the comparison between the two plants is that the biological phosphorus removal efficiency under practical operating conditions is affected by the SRT in the plant and the wastewater composition. Thus great care should be taken when extrapolating results from one type of plant to another. Indirectly the experiments confirm that results from lab-experiments with artificial wastewater are difficult to extrapolate through modelling to real life wastewater and conditions. The 2.5 years time series can be valuable in verification of models for Nitrogen and Enhanced Biological Phosphorus Removal. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
nutrient removal, modelling, activated sludge, design, operation, wastewater
in
Water Science and Technology
volume
45
issue
6
pages
137 - 144
publisher
IWA Publishing
external identifiers
  • wos:000175103800014
  • pmid:11989867
  • scopus:0036213790
ISSN
0273-1223
language
English
LU publication?
yes
id
1b9c5591-fb32-44ff-a023-1f4fc5770fd9 (old id 339733)
alternative location
http://www.iwaponline.com/wst/04506/wst045060137.htm
date added to LUP
2007-10-15 13:46:44
date last changed
2017-01-01 07:12:45
@article{1b9c5591-fb32-44ff-a023-1f4fc5770fd9,
  abstract     = {The paper deals with the effect of wastewater, plant design and operation in relation to biological nitrogen and phosphorus removal and the possibilities to model the processes. Two Bio-P pilot plants were operated for 2.5 years in parallel receiving identical wastewater. The plants had SRT of 4 and 21 days, the latter had nitrification and denitrification. The plant with 4 days SRT had much more variable biomass characteristics, than the one with the high SRT. The internal storage compounds, PHA, were affected significantly by the concentration of fatty acids or other easily degradable organics in the wastewater, and less by the plant lay-out. The phosphorus removal is mainly dependent on availability in the wastewater of fatty acids but also by the suspended solids in the effluent, which is higher in the plant with nitrification-denitrification, probably due to a higher SVI or denitrification in the settler. The addition of glucose to the influent seems to have an effect on the performance of the plants similar to that of acetic acid. In spite of great load variations over time to the pilot plants and the different operational modes, the study of population dynamics showed less significant variations with time which has importance in relation to modelling. The overall conclusion of the comparison between the two plants is that the biological phosphorus removal efficiency under practical operating conditions is affected by the SRT in the plant and the wastewater composition. Thus great care should be taken when extrapolating results from one type of plant to another. Indirectly the experiments confirm that results from lab-experiments with artificial wastewater are difficult to extrapolate through modelling to real life wastewater and conditions. The 2.5 years time series can be valuable in verification of models for Nitrogen and Enhanced Biological Phosphorus Removal.},
  author       = {Henze, M and Aspegren, H and la Cour Jansen, Jes and Nielsen, PH and Lee, N},
  issn         = {0273-1223},
  keyword      = {nutrient removal,modelling,activated sludge,design,operation,wastewater},
  language     = {eng},
  number       = {6},
  pages        = {137--144},
  publisher    = {IWA Publishing},
  series       = {Water Science and Technology},
  title        = {Effect of solids retention time and wastewater characteristics on biological phosphorus removal},
  volume       = {45},
  year         = {2002},
}