Handbook of Solvents - George Wypych - ChemTech - Ventech!

23.1 Natural attenuation of chlorinated solvents 1585
against the other hydrogen utilizers for the available hydrogen. Smatlak et al. 51 suggest that
the competition for hydrogen is controlled primarily by the Monod half-saturation constant
Ks(H2), the concentration at which a specific strain of bacteria can utilize hydrogen at half
the maximum utilization rate. Ballapragada et al., 52 however, provide a more detailed discussion
of halorespiration kinetics and point out that competition for hydrogen also depends
on additional factors including the bacterial growth rate and maximum hydrogen utilization
rate.
Smatlak et al. 51 have suggested that the steady-state concentration of hydrogen will be
controlled by the rate of hydrogen production from fermentation. Both laboratory results
and field observations have suggested, however, that the steady-state concentration of hydrogen
is controlled by the type of bacteria utilizing the hydrogen and is almost completely
independent of the rate of hydrogen production. 52,55-57 Under nitrate reducing conditions,
steady-state H2 concentrations were