A. Anaerobic

Outside Cell

Inside Cell


Glycogen PHB

PoiyATP ^


B. Aerobic

Figure 2.6 Schematic diagram depicting the Mino model for the uptake and release of inorganic phosphate by PAOs: A. Anaerobic conditions; B. aerobic conditions. (Adapted from Went/el et al.v)

Soluble and Particulate Substrates plus Debris

Figure 2.7 Overview of fundamental events occurring in an aerobic bioreactor receiving a soluble substrate (Ssi). (Adapted from Mason et al.J")

will also be soluble microbial product (SMP) formation associated with that substrate consumption and growth. Concurrently with growth, the biomass will be undergoing decay and lysis, releasing soluble (Ss2) and particulate (Xs) substrate to the medium. Cell debris (X,>), which is degraded so slowly that it appears to be nonbiodegradable, and biomass associated products (SD) are also released. The particulate cell fragments (Xs) undergo hydrolysis, freeing more substrate (Ss2) that can be used by the cells. Part of the microbial products may undergo biod├ęgradation, but others may be degraded so slowly that they appear inert. As might be imagined by the previous discussion in this section, more complicated conceptualizations could be depicted. However, this one contains the essential elements required to model biological processes and it will be used in later chapters for that purpose.

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