Interrelationship of DOC Distribution in Metabolic Network to Growth Yield in Batch Culture
Publication: Journal of Environmental Engineering
Volume 126, Issue 1
Abstract
Oxidative assimilation of dissolved organic carbon (DOC) includes the interrelated processes of catabolism and anabolism. It has been demonstrated that energy uncoupling is a dominant characteristic of substrate-sufficient batch culture. However, the interrelationship of DOC distribution between catabolism and anabolism to the observed growth yield (Yobs) has not yet been clear for substrate-sufficient batch cultures. In this study, the DOC distribution between catabolism and anabolism was described using a ratio of the DOC channeled into carbon dioxide (SCO2) to the DOC converted into biomass (Sg). Based on a balanced oxidative reaction of DOC, a SCO2/Sg-dependent Yobs model was developed for substrate-sufficient batch culture, and was verified with experimental and literature data. The model showed a reducing trend of growth yield an increasing SCO2/Sg ratio. It appears that the imbalance between catabolism and anabolism induced by substrate excess leads to non-growth-associated DOC consumption, which is responsible for the observed reduction of Yobs under substrate-sufficient conditions.
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Published In
Journal of Environmental Engineering
Volume 126 • Issue 1 • January 2000
Pages: 89 - 92
History
Received: Feb 2, 1999
Published online: Jan 1, 2000
Published in print: Jan 2000
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