The principal objective of this study was to investigate viability kinetics in aerobic AS (Activated
Sludge). A kinetic model was developed in order to predict viable cells, non-degraded dead cells
and inert VSS (Volatile Suspended Solids) in a reactor –...
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The principal objective of this study was to investigate viability kinetics in aerobic AS (Activated
Sludge). A kinetic model was developed in order to predict viable cells, non-degraded dead cells
and inert VSS (Volatile Suspended Solids) in a reactor – usually conventional models only predict
active biomass and inert VSS. The following processes were considered in the derivation of the
model: the death rate of viable cells, and the hydrolysis rate of dead cells. Equations development
led to a decay coefficient (b) – previously considered constant – function of death rate, hydrolysis
rate and solid retention time. Cell growth on soluble COD (Chemical Oxygen Demand) resulting
from lysis/hydrolysis has been introduced in the model. Simulation methods of viability in AS, and
OUR (Oxygen Uptake Rate) tests of AS in batch under starvation were developed in order to
validate the model, and to determine its parameters. The results of this study indicate that the
proposed model is c
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