第六章测试1.What is the purpose of the effluent recycle line in two-phase system of fluidized-bed? ( )
A:support oxygen by oxygenator system
B:control the upward flow velocity
C:increase the bed turbulence
D:control the BOD loading in influent
答案:AB
2.In biological contactors (RBC), the percent submergence is too high and might lead to ( ).
A:oxygen deficit
B:higher suspend sludge
C:lower COD in effluent
D:odor
3.The microbial population in biofilm and activated sludge are different in species owing to the differences in the microorganism accumulated formation, although there are same electron donors and acceptors. ( )
A:错 B:对 4.The changing of influent (Q) is usually controlled to chang the surface loading of trickling filters and biological tower. ( )
A:对 B:错 5.The medium will not move extensively when it is uniform in fluidized-bed reactor. ( )
A:错 B:对
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