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The hydraulic condition of the rotary baffle plate flocculation tank is better than that of the reciprocating type, and head loss of the rotary type is 40% less than that of the reciprocating type. ( ) A:对 B:错 答案: 对There are many ways for the control of coagulant dosage and automatic detection, including ( ).
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The challenges of urban water resources include ( ).
A:Urban water distribution renders large energy consumption.
B:Capital and operational costs of water supply for long distance transportation are high.
C:High risk of urban water pollution.
D:The standards of urban water quality are high due to the increasing concerns about the safety of urban water sources.
答案: Urban water distribution renders large energy consumption.
,Capital and operational costs of water supply for long distance transportation are high.
,High risk of urban water pollution.
,The standards of urban water quality are high due to the increasing concerns about the safety of urban water sources.
It is relatively hard to separate salt from water, because ions such as Ca2+，Mg2+，K+ are tightly surrounded by water molecules.
A:错
B:对
答案: 对
Lakes and reservoir waters usually have low water mobility, high turbidity, and relatively stable water quality. ( )
A:错
B:对
答案: 错
Heavy metals can be concentrated in plant roots or aquatic animals, causing great danger to living organisms. ( )
A:错
B:对
答案: 对
In the US, different sewage plants follow the same discharge standards. ( )
A:错
B:对
答案: 错
Increasing ionic strength would compress the electric double layer and increase the stability of the colloid. ( )
A:对
B:错
答案: 错
G value and GT value are employed to design coagulation tanks, because they can describe the coagulation process comprehensively. ( )
A:错
B:对
答案: 错
The hydraulic condition of the rotary baffle plate flocculation tank is better than that of the reciprocating type, and head loss of the rotary type is 40% less than that of the reciprocating type. ( )
A:对
B:错
答案: 对
There are many ways for the control of coagulant dosage and automatic detection, including ( ).
A:dosing according to experience
B:streaming current detector (SCD)
C:establishing a mathematical model according to the quantity and quality of raw water
D:light transmission pulsation detector
答案: streaming current detector (SCD),establishing a mathematical model according to the quantity and quality of raw water
,light transmission pulsation detector
Which one below belongs to organic coagulant ( ).
A:lime glue
B:aluminum sulfate
C:polyacrylamide (PAM)
D:poly aluminum chloride (PAC)
答案: polyacrylamide (PAM)
Which of the following measure could not improve the settling efficiency in sedimentation tank? ( )
A:To increase the surface area of the tank
B:To recycle the sludge to improve the size of particles
C:To improve the performance of flocculation before sedimentation
D:To increase the flow rate
答案: To increase the flow rate
The feed water will go into the upper part of the sedimentation tank under the case of density current of high turbid water, leading to the deterioration of the effluent quality. （ ）
A:错
B:对
答案: 错
There is an ineffective zone exists in the inclined tube/ plate sedimentation tank. The ineffective zone would increase if the settling zone is small in the tank. ( )
A:错
B:对
答案: 对
Which of the following methods can recover the adsorption capacity of sludge in clarifier process? ( )
A:To generate a pulse to break the large flocs
B:To discharge the sludge completely in the clarifier
C:To circulate the sludge by a water jet
D:To circulate the sludge mechanically
答案: To generate a pulse to break the large flocs
,To circulate the sludge by a water jet
,To circulate the sludge mechanically
θ presents the contact angle of water on the solid surface. Which of the pollutant(s) with the following value of the contact angle cannot be removed by air flotation process. ( )
A:θ=85°
B:θ=150°
C:θ=95°
D:θ=1°
答案: θ=85°
,θ=1°
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