Modeling the Dynamics of an Activated Sludge Process Using Yield and Growth Functions
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Transient or dynamic responses often occur in continuous aerobic systems like the activated sludge process when environmental variables change. The system's response to a dynamic load change has yet to be successfully modeled. In this paper we examine previously collected experimental data of the system's response to a step change. The real time profile of the growth rate <I>μ</I> and the cell/substrate yield, <I>Y</I>, are studied via parametric manipulation. It was observed that both variables, <I>μ</I> and <I>Y</I>, experience an initial step drop and then a hysteresis response to a new steady-state level, following a sudden step change in the feed flow rate. A modified Monod equation is proposed here to qualitatively model the hysteresis dynamic response of a sudden dilution rate change to an open, continuous microbial growth system.
- JOURNAL OF CHEMICAL ENGINEERING OF JAPAN
JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 39(8), 846-854, 2006-08-01
The Society of Chemical Engineers, Japan