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Multi-objective performance assessment of wastewater treatment plants combining plant-wide process models and life cycle assessment

Arnell, Magnus LU ; Rahmberg, Magnus; Oliveira, Felipe and Jeppsson, Ulf LU (2017) In Journal of Water and Climate Change 8(4). p.715-729
Abstract

Multi-objective performance assessment of operational strategies at wastewater treatment plants (WWTPs) is a challenging task. The holistic perspective applied to evaluation of modern WWTPs, including not only effluent quality but also resource efficiency and recovery, global environmental impact and operational cost calls for assessment methods including both on- and off-site effects. In this study, a method combining dynamic process models – including greenhouse gas (GHG), detailed energy models and operational cost – and life cycle assessment (LCA) was developed. The method was applied and calibrated to a large Swedish WWTP. In a performance assessment study, changing the operational strategy to chemically enhanced primary treatment... (More)

Multi-objective performance assessment of operational strategies at wastewater treatment plants (WWTPs) is a challenging task. The holistic perspective applied to evaluation of modern WWTPs, including not only effluent quality but also resource efficiency and recovery, global environmental impact and operational cost calls for assessment methods including both on- and off-site effects. In this study, a method combining dynamic process models – including greenhouse gas (GHG), detailed energy models and operational cost – and life cycle assessment (LCA) was developed. The method was applied and calibrated to a large Swedish WWTP. In a performance assessment study, changing the operational strategy to chemically enhanced primary treatment was evaluated. The results show that the primary objectives, to enhance bio-methane production and reduce GHG emissions were reached. Bio-methane production increased by 14% and the global warming potential decreased by 28%. However, due to increased consumption of chemicals, the operational cost increased by 87% and the LCA revealed that the abiotic depletion of elements and fossil resources increased by 77 and 305%, respectively. The results emphasize the importance of using plant-wide mechanistic models and life cycle analysis to capture both the dynamics of the plant and the potential environmental impacts.

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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
LCA, Mathematical modelling, Performance assessment, Process control, Wastewater treatment
in
Journal of Water and Climate Change
volume
8
issue
4
pages
15 pages
publisher
IWA Publishing
external identifiers
  • scopus:85036607674
  • wos:000416455900011
ISSN
2040-2244
DOI
10.2166/wcc.2017.179
language
English
LU publication?
yes
id
1303cf76-adcd-4f62-8477-3369bef100bb
date added to LUP
2018-01-02 12:17:41
date last changed
2018-01-16 13:28:43
@article{1303cf76-adcd-4f62-8477-3369bef100bb,
  abstract     = {<p>Multi-objective performance assessment of operational strategies at wastewater treatment plants (WWTPs) is a challenging task. The holistic perspective applied to evaluation of modern WWTPs, including not only effluent quality but also resource efficiency and recovery, global environmental impact and operational cost calls for assessment methods including both on- and off-site effects. In this study, a method combining dynamic process models – including greenhouse gas (GHG), detailed energy models and operational cost – and life cycle assessment (LCA) was developed. The method was applied and calibrated to a large Swedish WWTP. In a performance assessment study, changing the operational strategy to chemically enhanced primary treatment was evaluated. The results show that the primary objectives, to enhance bio-methane production and reduce GHG emissions were reached. Bio-methane production increased by 14% and the global warming potential decreased by 28%. However, due to increased consumption of chemicals, the operational cost increased by 87% and the LCA revealed that the abiotic depletion of elements and fossil resources increased by 77 and 305%, respectively. The results emphasize the importance of using plant-wide mechanistic models and life cycle analysis to capture both the dynamics of the plant and the potential environmental impacts.</p>},
  author       = {Arnell, Magnus and Rahmberg, Magnus and Oliveira, Felipe and Jeppsson, Ulf},
  issn         = {2040-2244},
  keyword      = {LCA,Mathematical modelling,Performance assessment,Process control,Wastewater treatment},
  language     = {eng},
  number       = {4},
  pages        = {715--729},
  publisher    = {IWA Publishing},
  series       = {Journal of Water and Climate Change},
  title        = {Multi-objective performance assessment of wastewater treatment plants combining plant-wide process models and life cycle assessment},
  url          = {http://dx.doi.org/10.2166/wcc.2017.179},
  volume       = {8},
  year         = {2017},
}