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Analysing sludge balance in activated sludge systems with a novel mass transport model

In activated sludge systems the mechanically treated wastewater is biologically cleaned by biomass (activated sludge). The basic requirement of an efficient biological wastewater treatment is to have as a high biomass concentration in the biological reactor (BR) as possible. The activated sludge bal...

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Published in:Water science and technology 2008-01, Vol.57 (9), p.1413-1419
Main Authors: Patziger, M, Kainz, H, Hunze, M, Jozsa, J
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Kainz, H
Hunze, M
Jozsa, J
description In activated sludge systems the mechanically treated wastewater is biologically cleaned by biomass (activated sludge). The basic requirement of an efficient biological wastewater treatment is to have as a high biomass concentration in the biological reactor (BR) as possible. The activated sludge balance in activated sludge systems is controlled by the settling, thickening, scraper mechanism in the secondary settling tank (SST) and sludge returning. These processes aim at keeping maximum sludge mass in the BR and minimum sludge mass in the SST even in peak flow events (storm water flow). It can be, however, only reached by a high SST performance. The main physical processes and boundary conditions such as inhomogeneous turbulent flow, geometrical features of the SST, wastewater treatment plant (WWTP) load, return sludge flow, sludge volume index etc. all influence settling thickening and sludge returning. In the paper a novel mass transport model of an activated sludge system is presented which involves a 2-dimensional SST model coupled with a mixed reactor model of the biological reactor. It makes possible to investigate different sludge returning strategies and their influence on the sludge balance of the investigated activated sludge system, furthermore, the processes determining the flow and concentration patterns in the SST. The paper gives an overview on the first promising model results of a prevailing peak flow event investigation at the WWTP of Graz.
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identifier ISSN: 0273-1223
ispartof Water science and technology, 2008-01, Vol.57 (9), p.1413-1419
issn 0273-1223
1996-9732
language eng
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source Alma/SFX Local Collection
subjects Activated sludge
Biological wastewater treatment
Biomass
bioreactors
Boundary conditions
calibration
Computational fluid dynamics
dynamic models
equipment performance
Investigations
Mass transport
model validation
Models, Theoretical
Reactors
Sea surface
Settling
Sewage - analysis
Sewage - chemistry
simulation models
Sludge
Sludge settling
Sludge thickening
Sludge volume index
Storms
Stormwater
Surface temperature
Thickening
Transport
Turbulence
Turbulent flow
Two dimensional models
Waste Disposal, Fluid - instrumentation
Waste Disposal, Fluid - methods
Wastewater
Wastewater treatment
Wastewater treatment plants
Water flow
Water Purification - instrumentation
Water Purification - methods
Water treatment plants
title Analysing sludge balance in activated sludge systems with a novel mass transport model
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