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起止时间:2021-04-30到2021-07-26
更新状态:每5天更新一次
1 Water cycle and water quality standards
1、 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.
2、 It is relatively hard to separate salt from water, because ions such as Ca2+，Mg2+，K+ are tightly surrounded by water molecules.
A:正确
B:错误
答案: 正确
3、 Lakes and reservoir waters usually have low water mobility, high turbidity, and relatively stable water quality.
A:正确
B:错误
答案: 错误
4、 Heavy metals can be concentrated in plant roots or aquatic animals, causing great danger to living organisms.
A:正确
B:错误
答案: 正确
5、 In the US, different sewage plants follow the same discharge standards.
A:正确
B:错误
答案: 错误
2 Coagulation theory and technology
1、 Which one below belongs to organic coagulant ( )
A:polyacrylamide (PAM)
B:aluminum sulfate
C:lime glue
D:poly aluminum chloride (PAC)
答案: polyacrylamide (PAM)
2、 There are many ways for the control of coagulant dosage and automatic detection, including ( ).
A:establishing a mathematical model according to the quantity and quality of raw water
B:streaming current detector (SCD)
C:dosing according to experience
D:light transmission pulsation detector
答案: establishing a mathematical model according to the quantity and quality of raw water;
streaming current detector (SCD);
light transmission pulsation detector
3、 Increasing ionic strength would compress the electric double layer and increase the stability of the colloid.
A:正确
B:错误
答案: 错误
4、 G value and GT value are employed to design coagulation tanks, because they can describe the coagulation process comprehensively.
A:正确
B:错误
答案: 错误
5、 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:正确
B:错误
答案: 正确
3 Theory and technology of sedimentation
1、 Which of the following measure could not improve the settling efficiency in sedimentation tank? ( )
A:To recycle the sludge to improve the size of particles
B:To increase the surface area of the tank
C:To increase the flow rate
D:To improve the performance of flocculation before sedimentation
答案: To increase the flow rate
2、 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 circulate the sludge mechanically
C:To discharge the sludge completely in the clarifier
D:To circulate the sludge by a water jet
答案: To generate a pulse to break the large flocs;
To circulate the sludge mechanically;
To circulate the sludge by a water jet
3、 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=95°
B:θ=85°
C:θ=1°
D:θ=150°
答案: θ=85°;
θ=1°
4、 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:正确
B:错误
答案: 错误
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