A kinetic model incorporating energy spilling for substrate removal in substrate-sufficient batch culture of activated sludge |
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| Authors: | Y Liu G H Chen J L Rols |
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| Institution: | (1) School of Civil and Structural Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798 e-mail: cyliu@ntu.edu.sg Tel.: +65-790-6913 Fax: +65-791-0676, SG;(2) Department of Civil and Structural Engineering, Hong Kong University of Science and Technology, Hong Kong, HK;(3) Départment de Génie Biochimique et Alimentaire, Institut National des Sciences Appliquées, 31077 Toulouse, France, FR |
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| Abstract: | Batch assays are currently used to study the kinetic behavior of microbial growth. However, it has been shown that the outcome
of batch experiments is greatly influenced by the initial ratio of substrate concentration (S
o) to biomass concentration (X
o). Substrate-sufficient batch culture is known to have mechanisms of spilling energy that lead to significant nongrowth-associated
substrate consumption, and the Monod equation is no longer appropriate. By incorporating substrate consumption associated
with energy spilling into the balance of the substrate oxidation reaction, a kinetic model for the observed specific substrate
consumption rate was developed for substrate-sufficient batch culture of activated sludge, and was further verified by experimental
data. It was demonstrated that the specific substrate consumption rate increased with the increase of the S
o/X
o ratio, and the majority of substrate was consumed through energy spilling at high S
o/X
o ratios. It appears that the S
o/X
o ratio is a key parameter in regulating metabolic pathways of microorganisms.
Received: 18 January 1999 / Received revision: 7 May 1999 / Accepted: 28 May 1999 |
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