We consider a chemostat-type model in which a single species feeds on
a limiting nutrient supplied at a constant rate. The model incorporate
s a general nutrient uptake function and two distributed (infinite) de
lays. The first delay models the fact that the nutrient is partially r
ecycled after the death of the biomass by bacterial decomposition, and
the second delay indicates that the growth of the species depends on
the past concentration of the nutrient. By constructing appropriate Li
apunov-like functionals, we obtain sufficient conditions for local and
global stability of the positive equilibrium of the model. Quantitati
ve estimates on the size of the delays for local and global stability
are also obtained with the help of the Liapunov-like functionals. The
technique we use in this paper may be used as well to study global sta
bility of other types of physical models with distributed delays.