智慧树知到答案ENVIRONMENTAL BIOTECHNOLOGY最新答案

第三章 单元测试

1、单选题：
The idealized biofilm having the following properties except ( ).
选项：
A:The biofilm has a uniform biomass density.
B:An effective diffusion layer of thickness L represents external mass-transport resistance.
C:Has a locally uniform thickness of Lf.
D:Mass-transport resistance is not important to the biofilm.
答案: 【】

2、单选题：
The following description of the fundamental “law” of the steady-state biofilm is correct. ( )
选项：
A:The growth of new biomass per unit area per hour (YJ T) is just balanced by the losses.
B:The growth of new biomass per unit area per hour (YJT) is just balanced by the losses per unit area b’XfLf.
C:The growth of new biomass (YJ) is just balanced by the losses per unit area b’XfLf.
D:The growth of new biomass per unit area (YJ) is just balanced by the losses per unit areab’XfLf.
答案: 【】

3、多选题：
The model of a steady-state biofilm requires simultaneous solution of ( ).
选项：
A:mass-balance for substrate in the biofilm.
B:boundary and continuity conditions.
C:mass-balance for substrate transport to the biofilm.
D:mass-balance for active biomass in the biofilm
答案: 【】

4、多选题：
The following figures shows that ( ).
选项：
A:J andXfLfincreases very sharply as S increases slightly above Smin.
B: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.
C:At some value of S>Smin, the slope of J versus S declines from near infinity and approaches 1.0.
D: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.
答案: 【】

5、判断题：
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. ( )
选项：
A:对
B:错
答案: 【】

6、判断题：
Two biofilms having the same physical thickness, should have similar values. ( )
选项：
A:错
B:对
答案: 【】

7、判断题：
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.
选项：
A:对
B:错
答案: 【】

8、判断题：
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. ( )
选项：
A:错
B:对
答案: 【】

9、判断题：
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. ( )
选项：
A:错
B:对
答案: 【】

10、判断题：
For deep biofilm, it has the maximum flux into the biofilm. ( )
选项：
A:对
B:错
答案: 【】

第四章 单元测试

1、多选题：
Which of the following should be balanced in a model? ( )
选项：
A:components in mole/L
B:COD
C:elements
D:charges
答案: 【】

2、判断题：
Anabolism is related to the rate of substrate uptake by a yield. ( )
选项：
A:错
B:对
答案: 【】

3、判断题：
Nitrite is included in ASM1. ( )
选项：
A:错
B:对
答案: 【】

4、判断题：
Hydrolysis is usually simulated via first order kinetic. ( )
选项：
A:对
B:错
答案: 【】

5、判断题：
Both anoxic and aerobic growth of heterotrophs are considered in ASM1. ( )
选项：
A:错
B:对
答案: 【】

第五章 单元测试

1、多选题：
Secondary consumers in the activated sludge system include: ( ).
选项：
A:chemolithotrophic bacteria
B:heterotrophic bacteria
C:prokaryotes
D:predators
答案: 【】

2、单选题：
Which one of the following is the most popular reactor configurations being used in wastewater treatment these days ( ).
选项：
A:Step aeration
B:Modified Aeration
C:Completely mixed
D:Conventional Aeration
答案: 【】

3、单选题：
The conventional activated sludge system could remove BOD5 and suspended solids (SS) by ( ) percent or more for municipal sewage treatment.
选项：
A:80
B:90
C:85
D:75
答案: 【】

4、判断题：
For a conventional design for the activated sludge treatment of domestic sewage, the F/M ratio suggested is 0.25 to 0.5 kg BOD5 per day per kg MLSS.（ ）
选项：
A:错
B:对
答案: 【】

5、判断题：
In most situations, the electron donor, or the BOD, is rate limiting for microorganism reproduction and growth.（ ）
选项：
A:错
B:对
答案: 【】

第六章 单元测试

1、多选题：
What is the purpose of the effluent recycle line in two-phase system of fluidized-bed? ( )
选项：
A:control the BOD loading in influent
B:control the upward flow velocity
C:support oxygen by oxygenator system
D:increase the bed turbulence
答案: 】

2、多选题：
In biological contactors (RBC), the percent submergence is too high and might lead to ( ).
选项：
A:lower COD in effluent
B:odor
C:higher suspend sludge
D:oxygen deficit
答案: 【】

3、判断题：
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. ( )
选项：
A:错
B:对
答案: 【】

4、判断题：
The changing of influent (Q) is usually controlled to chang the surface loading of trickling filters and biological tower. ( )
选项：
A:对
B:错
答案: 【】

5、判断题：
The medium will not move extensively when it is uniform in fluidized-bed reactor. ( )
选项：
A:错
B:对
答案: 【】

第七章 单元测试

1、多选题：
Advantages of anaerobic treatment include ( ) .
选项：
A:High removal efficiency with dilute wastes.
B:Produce useful end products.
C:Low production of waste biological solids.
D:High organic loading is possible.
答案: 【】

2、多选题：
The successful start-up and operation of an anaerobic system requires: ( ).
选项：
A:Add buffering material in the form of chemical to protect against pH drop.
B:Bring the system to temperature.
C:Fill the digester with seed and water.
D:Begin with as much good anaerobic seed as possible.
答案: 【】

3、多选题：
Possible methods to control toxicity in anaerobic treatments: ( ).
选项：
A:The toxicity of sulfide can be reduced by gas stripping from the reactor.
B:The toxicity of some heavy metals can be removed by addition of sulfide.
C:Maintaining a lower pH can reduce ammonia toxicity.
D:The toxicity of long-chain fatty acids can be reduced by calcium.
答案: 【】

4、单选题：
Which of the following statements is false about the characteristics of baffled reactor: ( ).
选项：
A:Design loading typically is in the range of 4 to 15 kg COD/m3-d.
B:A recycle line can be added to remove biosolids from the last chamber and return them to the first.
C:Overcome the biosolids loss from the UASB system.
D:Wastewater moves upward and downward.
答案: 【】

5、单选题：
Estimating the methane production of anaerobic treatment process for wastewater containing 1.0 M glucose: ( ).
选项：
A:3.36 mol.
B:2.4 mol.
C:0.24 mol.
D:2.64 mol.
答案: 【】

6、多选题：
The process of anaerobic treatment can be broken into which of the following steps: ( ).
选项：
A:The conversion of the organic acids and hydrogen into methane.
B:The organic acids are then partially used by archael methanogens to convert them into methane.
C:The simple carbohydrates and acids are utilized to obtain energy for growth by fermenting bacteria.
D:Hydrolysis and fermentation of complex organic matter into simple organic acid and hydrogen.
答案: 【】

7、单选题：
An absolute minimum value of θx to allow stable methanogenesis for a CSTR is: ( ).
选项：
A:10 day.
B:20 day.
C:5 day.
D:15 day.
答案: 【】

8、多选题：
The contents of the digester can be heated through: ( ).
选项：
A:Injected steam through lances or diffusers.
B:Pumping back warmed sludge through external heat exchangers
C:Heat exchangers located inside the digester.
D:Direct heating the reactor.
答案: 【】

9、多选题：
The primary design criterion of CSTR contains: ( ).
选项：
A:The methane-gas yield.
B:Detention time.
C:The net sludge production.
D:The volatile-solids loading rate.
答案: 【】

10、判断题：
The routine measurement of volatile acid concentration is of great-importance in the operation and control of anaerobic system.（ ）
选项：
A:错
B:对
答案: 【】

11、判断题：
About 15 to 20 percent of the organic matter is converted into biological solids in anaerobic treatment.（ ）
选项：
A:错
B:对
答案: 【】

第八章 单元测试

1、判断题：
Keeping the organic loading below 2 to 6 kg BODL/(1,000 m2d) makes it possible to maintain a sufficient bulk-liquid DO. ( )
选项：
A:对
B:错
答案: 【】

2、判断题：
The overall reaction from NO3- to N2 reduce the N by 5 electron equivalents per N. ( )
选项：
A:对
B:错
答案: 【】

3、判断题：
Almost all bio-film system work well for de-nitrification, as long as oxygen transfer can be kept to a minimum and plugging does not occur. ( )
选项：
A:错
B:对
答案: 【】

4、判断题：
One possible drawback of the UCT process is that the sludge recycle returns NO3- to the anaerobic tank. ( )
选项：
A:错
B:对
答案: 【】

5、判断题：
When phosphorus is removed as part of biological treatment, metal salts can be added to the influent wastewater, directly to the aeration basin, or to the mixed liquor before it goes to the settler. ( )
选项：
A:对
B:错
答案: 【】