知到答案Environmental Biotechnology智慧树答案_2022年

第三章

The idealized biofilm having the following properties except ( ).
答案:Mass-transport resistance is not important to the biofilm.
The following description of the fundamental “law” of the steady-state biofilm is correct. ( )
The growth of new biomass per unit area per hour (YJ   T) is just balanced by the losses.
The growth of new biomass per unit area per hour (YJ   T) is just balanced by the losses per unit area b’X_fL_f.
The growth of new biomass per unit area (YJ ) is just balanced by the losses per unit area b’X_fL_f.
答案:The growth of new biomass per unit area (YJ) is just balanced by the losses per unit areab’XfLf.
The model of a steady-state biofilm requires simultaneous solution of ( ).
答案:mass-balance for substrate in the biofilm.;boundary and continuity conditions.;mass-balance for substrate transport to the biofilm.;mass-balance for active biomass in the biofilm
The following figures shows that ( ).
For S large enough, J (and X_fL_f) increases for larger S, because the substrate concentrations inside the biofilm rise in response to a higher S.
For very large S, the slope of J versus S declines gradually and eventually approaches the limiting case of one-half-order kinetics, or J=k_1/2S^1/2 .

J and X_fL_f increases very sharply as S increases slightly above S_min.

答案:At some value of S>Smin, the slope of J versus S declines from near infinity and approaches 1.0.;For S large enough, J (and XfLf) increases for larger S, because the substrate concentrations inside the biofilm rise in response to a higher S.;For very large S, the slope of J versus S declines gradually and eventually approaches the limiting case of one-half-order kinetics, or J=k1/2S1/2.;J andXfLfincreases very sharply as S increases slightly above Smin.
The result of mass-transport resistance is that the substrate concentrations at any position in the biofilm usually are lower than in the bulk liquid. ( )
答案:对
Two biofilms having the same physical thickness, should have similar values. ( )
答案:错
The fundamental understanding of a steady-state biofilm is that the biomass per unit surface area (XfLf) is constant in time, and the biomass at any one location is at steady state.
答案:错
S*minrepresentsthe growth potential in the steady-state-biofilm model, and S*minmuch less than 1.0 indicates the net positive growth is much greater than the loss. ( )
答案:对
K* compares external mass transport to the maximum utilization rate. K* less than 1 means that the substrate utilization is controlled by external mass transport. ( )
答案:对
For deep biofilm, it has the maximum flux into the biofilm. ( )
答案:对