An improved 1D reactive Bürger-Diehl settler model for secondary settling tank denitrification.
clarifier geometry
mathematical modeling
reactive settling
rising sludge
secondary sedimentation
separation process modeling
Journal
Water environment research : a research publication of the Water Environment Federation
ISSN: 1554-7531
Titre abrégé: Water Environ Res
Pays: United States
ID NLM: 9886167
Informations de publication
Date de publication:
Dec 2022
Dec 2022
Historique:
revised:
22
11
2022
received:
12
09
2022
accepted:
26
11
2022
pubmed:
16
12
2022
medline:
17
12
2022
entrez:
15
12
2022
Statut:
ppublish
Résumé
An improved 1D reactive settler model is pursued in order to increase the understanding of reactive settling processes and obtain a better prediction of the nitrogen mass balance in wastewater treatment systems. The developed model is based on the 1D Bürger-Diehl settler model with compression function and the Activated Sludge Model No. 1 biological reactions. Specific attention was paid in the model development phase to optimal selection of settling velocity functions and integration of the correct clarifier geometry. A unique measurement campaign was carried out with different operational scenarios to quantify the denitrification in a secondary settling tank. A detailed step-wise calibration effort demonstrated that by choosing an appropriate settling velocity function (power-law structure) and considering the true clarifier geometry allows to accurately capture the biomass concentration profile, total sludge mass, sludge blanket height, and the reaction rates. The resulting model is able to accurately describe total suspended solids (TSS) and nitrate concentration profiles throughout a settling tank under different operational conditions. As such the model can be applied in further scenario analysis and system optimization. PRACTITIONER POINTS: A unique measurement campaign was carried out to obtain detailed data for a reactive settler model development. A 1-D reactive settler model is developed based on the Bürger-Diehl framework including ASM1 biokinetics and the clarifier geometry. An extensive calibration and model selection effort was performed. The model accurately predicts measured concentration profiles in the settling tank. The developed model can be integrated in a plant-wide model to properly calculate the nitrogen mass balance of a WRRF.
Substances chimiques
Sewage
0
Nitrogen
N762921K75
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e10825Subventions
Organisme : Quebec Water Research Center (CentrEau)
Organisme : Natural Sciences and Engineering Research Council of Canada
Informations de copyright
© 2022 Water Environment Federation.
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