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Phasic Utilization of Substrates by Aerobic Cultures

Sambhunath Ghosh, Frederick G. Pohland and William E. Gates
Journal (Water Pollution Control Federation)
Vol. 44, No. 3, Part I (Mar., 1972), pp. 376-400
Stable URL: http://www.jstor.org/stable/25037325
Page Count: 25
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Phasic Utilization of Substrates by Aerobic Cultures
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Abstract

In contrast to the usual assumption that all substrates are utilized simultaneously in aerobic waste stabilization systems, under some circumstances microorganisms assimilate the substrates sequentially in such a pattern that they multiply at the fastest attainable specific growth rate and at the same time achieve the maximum possible yield of biomass. In multisubstrate media, growth yield and specific growth rate are controlled by the substrate permitting the highest maximum specific growth rate and true yield coefficient, and the lowest saturation constant, when provided as sole carbon and energy source. Increase in concentration of this substrate repressed use of secondary substrates. Mathematical models describing sequential and concurrent assimilation in continuous-flow and batch processes were verified in experiments on glucose-galactose systems.

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