Environmental Biotechnology答案2023秋

第三章测试

1.

The idealized biofilm having the following properties except ( ).

A:Mass-transport resistance is not important to the biofilm.
B:The biofilm has a uniform biomass density.
C:Has a locally uniform thickness of Lf.
D:

An effective diffusion layer of thickness L represents external mass-transport resistance.  

答案:A
2.

The following description of the fundamental “law” of the steady-state biofilm is correct. ( )

A:

The growth of new biomass (YJ ) is just balanced by the losses per unit area b’X_fL_f.

B: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. C:The growth of new biomass per unit area (YJ ) is just balanced by the losses per unit area b’X_fL_f. D:The growth of new biomass per unit area per hour (YJ   T) is just balanced by the losses. 3.The model of a steady-state biofilm requires simultaneous solution of ( ).
A:mass-balance for substrate transport to the biofilm.
B:mass-balance for active biomass in the biofilm
C:boundary and continuity conditions.
D:mass-balance for substrate in the biofilm.
4.

The following figures shows that ( ).

A:

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

B: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 . C: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. D:At some value of S>S_min, the slope of J versus S declines from near infinity and approaches 1.0. 5.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. ( )
A:错 B:对 6.

Two biofilms having the same physical thickness, should have similar values. ( )

A:错 B:对 7.

The fundamental understanding of a steady-state biofilm is that the biomass per unit surface area (X_fL_f) is constant in time, and the biomass at any one location is at steady state. 

A:对 B:错 8.

S^*_min represents the growth potential in the steady-state-biofilm model, and S^*_min much less than 1.0 indicates the net positive growth is much greater than the loss. (   )

A:错 B:对 9.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. ( )
A:错 B:对 10.For deep biofilm, it has the maximum flux into the biofilm. ( )
A:对 B:错