Hydrodynamic behaviour of full scale trickling filters

In the trickling filter process, knowledge of the hydrodynamic behaviour is essential for accurate mechanistic modelling. Numerous measurements including the mean residence time, the free draining volume and the residence time distribution (RTD) have been performed in other studies. However, these r...

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Bibliographic Details
Published in:Water research (Oxford) 2000-04, Vol.34 (5), p.1551-1558
Main Authors: Séguret, Frédéric, Racault, Yvan, Sardin, Michel
Format: Article
Language:English
Subjects:
Applied sciences
biodiffusion
biofilm
Biofilms
Biological and medical sciences
Biological treatment of waters
Biotechnology
deconvolution
Diffusion in liquids
Environment and pollution
Environmental Sciences
Exact sciences and technology
Flow of fluids
free-draining volume
Fundamental and applied biological sciences. Psychology
General purification processes
hydrodynamic
Hydrodynamics
Industrial applications and implications. Economical aspects
Mathematical models
Organic compounds
Pollution
retention time
Reynolds number
RTD
tracer experiment
trickling filter
Viscosity
Wastewater
Wastewaters
Water treatment and pollution
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Summary:In the trickling filter process, knowledge of the hydrodynamic behaviour is essential for accurate mechanistic modelling. Numerous measurements including the mean residence time, the free draining volume and the residence time distribution (RTD) have been performed in other studies. However, these results have often been obtained at pilot scale, and there is still a lack of data for the full scale process. In the present work, eight full scale plastic-packed or stone-packed trickling filters receiving urban wastewater are studied. The free draining volume and the mean residence time obtained are used together with the literature data to find correlations. Despite the variety of operating conditions of the filters, correlations are established for the stone-packed filters as well as for the vertical and random plastic-packed filters. The RTDs were assessed from tracer experiments using injections of lithium chloride. In order to explain the observed RTDs, an hydrodynamic model is developed assuming that the tracer is transported by an axially dispersed plug flow and by diffusion in and out of the biomass. Model fitting permits to identify the volume of biomass and circulating liquid in the filter.
ISSN:0043-1354
1879-2448
DOI:10.1016/S0043-1354(99)00317-6