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Title of Journal: Water Sci Technol

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Abbravation: Water Science and Technology

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IWA Publishing

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DOI

10.1007/bf02637709

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ISSN

0273-1223

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On the modelling of the dynamic propagation of bio

Authors: Jeppsson Ulf Diehl Stefan
Publish Date: 1996/09/01
Volume: 34, Issue: 5-6, Pages: 85-92
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Abstract

When coupling a model of the biological reactor to a model of the settler difficulties appear because of the different representations used for the particulate material A combined model of the entire activated sludge process needs to include an algorithm for the dynamic propagation of the biological components of the particulate material through the secondary clarifier In particular this is of importance for an accurate description of the sludge that is recycled to the biological reactor Two onedimensional algorithms have been evaluated by means of numerical simulations The first algorithm investigated is the one by Otterpohl and Freund in 1992 and some inherent problems of this method are discussed For example it will produce oscillating solutions as the number of layers in the settler model increases Therefore an alternative algorithm is proposed It is based on a percentage vector that describes the different particulate biological components as fractions of the total suspended solids concentration The vector is updated for every layer in the settler model by a robust numerical method The algorithm is derived analytically is computationally efficient and does not exhibit any oscillatory behaviour

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Other Papers In This Journal:
  1. Volatile organic compounds (VOC) at some sewage treatment plants in Poland
  2. Detection of F+ bacteriophage in large volumes of water by a membrane filter method (MFM)
  3. Estimation of the fate of microbial water quality contaminants in a South African river
  4. Removal of PCR inhibiting substances in sewage sludge amended soil
  5. A newly isolated fungus participates in the corrosion of concrete sewer pipes
  6. Chemical perception and behavioral response of freshwater fish to 2-methylisoborneol
  7. Use of wastewater for crop production under arid and saline conditions: yield and hygienic quality of the crop and soil contaminations
  8. DAF treatment of a reservoir water supply: comparison with in-line direct filtration and control of organic matter
  9. Multiple interactions in riverine biofilms - surfactant adsorption, bacterial attachment and biodegradation
  10. Treatment of primary-settled urban sewage in pilot-scale vertical flow wetland filters: comparison of four emergent macrophyte species over a 12 month period
  11. Wastewater treatment by stabilization pond: Marrakesh experiment
  12. Methanogenic activity and performance of UASB, DSFF and USFF reactors
  13. Challenges for the development of advanced constructed wetlands technology
  14. Transition of a lake to turbid state six years after biomanipulation: mechanisms and pathways
  15. Nonlinear and set-point control of the dissolved oxygen concentration in an activated sludge process
  16. The influence of currents on circular secondary clarifier performance and design
  17. Treatment of gypsum waste in a two stage anaerobic reactor
  18. Evaluation of serratia marcescens bacteriophage as a tracer and a model for virus removal in waste stabilisation ponds
  19. Vulnerability to diffuse pollution and average nitrate contamination of european soils and groundwater
  20. Case studies on preliminary treatment facilities at marine outfalls
  21. Methods for studying dissolved oxygen levels in coastal and estuarine waters receiving combined sewer overflows
  22. The practical use of wastewater characterisation in design
  23. Efficacy of a combined system of copper and silver and free chlorine for inactivation of Naegleria fowleri amoebas in water
  24. Application of experimental research methodology to the study of nitrification in mixed culture
  25. Preliminary uncertainty analysis – a prerequisite for assessing the predictive uncertainty of hydrologic models
  26. Evaluation of the WHO nematode egg guidelines for restricted and unrestricted irrigation
  27. Principles and applications of dissolved air flotation
  28. Complete anaerobic digestion of activated sludge by combining membrane separation and alkaline heat post-treatment
  29. Dynamic simulation of sludge blanket movements in a full-scale rectangular sedimentation basin
  30. Rational design of packed saturators
  31. Towards managing catchment water utilisation for the Lake St Lucia ecosystem
  32. Bioelements and heavy metals in dry and wet depositions at some localities in the morava river basin
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