Transcript
Lecture 21
Microbial Energy Sources
• Respiration:
• Fermentation:
Monod Kinetics
Acetate-limited Sulfate-limited
[X] = biomass concentration, KS’ = half-saturation constant for the substrate (see MM kinetics)
Dual-Monod
KD’, KA’ = half-saturation constant for the Donor and Acceptor substrates
Microbial Growth
Correcting for the Thermodynamic Driving Force
• The thermodynamic potential factor (TPF) for microbial kinetics is of a form like: – The ΔGr part is the Q/K term we normally deal
with, just written differently – The ΔGP part is the energy needed for
phosphorylation (ATP production) • This reduces the overall free energy of reaction, and is
often about 40 to 50 kJ/mol
Microbial Rate Laws
• Monod:
• Dual Monod: