Abstract

This study considers the possibility that dispersed bacteria and bacteria aggregated in floc possess different physiological states and that aggregation of dispersed cells to form floc particles is a reversible rate process. A suitable kinetic model of flocculation is proposed, in which the floc phase and dispersed phase bacteria exhibit different growth rates. Transient responses to changes in dilution rate and inlet concentration are investigated. Results are compared with experimental observations. Variation in observed yield factor and hysteresis of specific growth rate are observed.

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