第七章单元测试
- Advantages of anaerobic treatment include ( ) .
- The successful start-up and operation of an anaerobic system requires: ( ).
- Possible methods to control toxicity in anaerobic treatments: ( ).
- Which of the following statements is false about the characteristics of baffled reactor: ( ).
- Estimating the methane production of anaerobic treatment process for wastewater containing 1.0 M glucose: ( ).
- The process of anaerobic treatment can be broken into which of the following steps: ( ).
- An absolute minimum value of θx to allow stable methanogenesis for a CSTR is: ( ).
- The contents of the digester can be heated through: ( ).
- The primary design criterion of CSTR contains: ( ).
- The routine measurement of volatile acid concentration is of great-importance in the operation and control of anaerobic system.（ ）
- About 15 to 20 percent of the organic matter is converted into biological solids in anaerobic treatment.（ ）
A:High removal efficiency with dilute wastes.
B:Low production of waste biological solids.
C:Produce useful end products.
D:High organic loading is possible.
答案:Low production of waste biological solids.
###Produce useful end products.
###High organic loading is possible.
A:Bring the system to temperature.
B:Add buffering material in the form of chemical to protect against pH drop.
C:Begin with as much good anaerobic seed as possible.
D:Fill the digester with seed and water.
A:Maintaining a lower pH can reduce ammonia toxicity.
B:The toxicity of long-chain fatty acids can be reduced by calcium.
C:The toxicity of sulfide can be reduced by gas stripping from the reactor.
D:The toxicity of some heavy metals can be removed by addition of sulfide.
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.
A:0.24 mol.
B:2.64 mol.
C:3.36 mol.
D:2.4 mol.
A:The organic acids are then partially used by archael methanogens to convert them into methane.
B:The conversion of the organic acids and hydrogen into methane.
C:Hydrolysis and fermentation of complex organic matter into simple organic acid and hydrogen.
D:The simple carbohydrates and acids are utilized to obtain energy for growth by fermenting bacteria.
A:10 day.
B:20 day.
C:5 day.
D:15 day.
A:Injected steam through lances or diffusers.
B:Direct heating the reactor.
C:Heat exchangers located inside the digester.
D:Pumping back warmed sludge through external heat exchangers
A:Detention time.
B:The net sludge production.
C:The methane-gas yield.
D:The volatile-solids loading rate.
A:错 B:对
A:对 B:错
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