Modification of the kinetics for modeling substrate storage and biomass growth mechanism in activated sludge system under aerobic condition

Based on the activated sludge model no.3 (ASM3), a new kinetic expression describing substrate removal and biomass growth mechanism occurring in activated sludge system under aerobic condition was established. The new model proposed that under feast condition, one part of substrate was utilized dire...

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Bibliographic Details
Published in:Chemical engineering science 2012-08, Vol.78, p.75-81
Main Authors: Fan, Ji, Vanrolleghem, Peter A., Lu, Shuguang, Qiu, Zhaofu
Format: Article
Language:English
Subjects:
Acetates
Activated sludge
Aircraft components
Applied sciences
Biomass
Calibration
Chemical engineering
chemical oxygen demand
Exact sciences and technology
General purification processes
Kinetics
Mathematical modeling
Mathematical models
oxygen
Oxygen demand
Oxygen uptake rate (OUR)
Parameter identification
Pollution
prediction
Sewerage works: sewers, sewage treatment plants, outfalls
Simulation
Simultaneous substrate storage and growth (SSSG)
wastewater treatment
Wastewaters
Water treatment and pollution
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Summary:Based on the activated sludge model no.3 (ASM3), a new kinetic expression describing substrate removal and biomass growth mechanism occurring in activated sludge system under aerobic condition was established. The new model proposed that under feast condition, one part of substrate was utilized directly for biomass growth and the other part was stored as internal storage products and simultaneously the storage products were used for biomass growth. The model was successfully calibrated on oxygen uptake rate (OUR) data and off-line soluble chemical oxygen demand (COD) dynamic variations obtained from batch experiments with biomass from a full-scale wastewater treatment plant (WWTP). OUR predictions with the calibrated model could reasonably describe the OUR profile after pulse addition of acetate, i.e., the OUR transiently reached a very high level, and then increased gradually to a maximum level until the initial substrate was taken up for storage and biomass growth. This new model also, for the first time, highlighted the significant effect of the biomass storage products concentration before pulse addition of acetate on OUR profile. ► During feast phase the SSSG process includes storage and growth using XSTO or substrate processes. ► There is no Monod inhibition function for the consumption of XSTO. ► The XSTO concentration before pulse addition of acetate can affect OUR profile.
ISSN:0009-2509
1873-4405
DOI:10.1016/j.ces.2012.05.004