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Aerobic microbial transformations of resuspended sediments in combined sewers - a conceptual model

Jes Vollertsen, Thorkild Hvitved-Jacobsen
Published January 1998, 37 (1) 69-76; DOI:
Jes Vollertsen
Environmental Engineering Laboratory, Aalborg University, Sohngaardsholmsvey 57, DK-9000 Aalborg, Denmark
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Thorkild Hvitved-Jacobsen
Environmental Engineering Laboratory, Aalborg University, Sohngaardsholmsvey 57, DK-9000 Aalborg, Denmark
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Abstract

A methodology for characterisation and a concept for modelling of aerobic microbial transformations of resuspended sewer sediments based on long term measurements of oxygen utilisation rates (OUR's) are presented. The OUR measurements were evaluated applying a conceptual model for aerobic microbial transformations of sewer solids based on methodologies originating from description of activated sludge processes. Validation showed that yield coefficient and maximum growth rate could be considered constant when readily biodegradable substrate was added to the resuspended sewer solids during the OUR experiment. Maintenance energy requirement of the biomass was argued to be a better concept for modelling microbial transformations compared with either considering decay of biomass into hydrolysible substrate or including endogenous decay of biomass. OUR measurements are recommended as a valuable methodology for characterisation of suspended sewer sediments in terms of COD-fractions and related biotransformations.

  • Oxygen utilisation rate (OUR)
  • combined sewer sediments
  • resuspension
  • biodegradability
  • hydrolysis
  • decay
  • maintenance energy requirement
  • endogenous respiration
  • modelling
  • © IWA Publishing 1998
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Aerobic microbial transformations of resuspended sediments in combined sewers - a conceptual model
Jes Vollertsen, Thorkild Hvitved-Jacobsen
Water Science and Technology Jan 1998, 37 (1) 69-76;
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Aerobic microbial transformations of resuspended sediments in combined sewers - a conceptual model
Jes Vollertsen, Thorkild Hvitved-Jacobsen
Water Science and Technology Jan 1998, 37 (1) 69-76;

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Keywords

Oxygen utilisation rate (OUR)
Combined sewer sediments
resuspension
biodegradability
hydrolysis
decay
maintenance energy requirement
Endogenous respiration
modelling
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