水质工程学智慧树知到课后章节答案2023年下哈尔滨工业大学

水质工程学智慧树知到课后章节答案2023年下哈尔滨工业大学
哈尔滨工业大学
第一章测试
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:The standards of urban water quality are high due to the increasing
concerns about the safety of urban water sources.
D:High risk of urban water pollution.
答案:Urban water distribution renders large energy consumption.
;Capital and operational costs of water supply for long distance
transportation are high.
;The standards of urban water quality are high due to the increasing
concerns about the safety of urban water sources.
;High risk of urban water pollution.
2.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
kes and reservoir waters usually have low water mobility, high turbidity,
and relatively stable water quality. ( )
A:对 B:错
答案:错
4.Heavy metals can be concentrated in plant roots or aquatic animals, causing
great danger to living organisms. ( )
A:错 B:对
答案:对
5.In the US, different sewage plants follow the same discharge standards. ( )
A:对 B:错
答案:错
第二章测试
1.Increasing ionic strength would compress the electric double layer and
increase the stability of the colloid. ( )
A:错 B:对
答案:错
2.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
3.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
4.There are many ways for the control of coagulant dosage and automatic
detection, including ( ).
A:streaming current detector (SCD) B:dosing according to experience
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
5.Which one below belongs to organic coagulant ( ).
A:aluminum sulfate
B:polyacrylamide (PAM)
C:poly aluminum chloride (PAC) D:lime glue
答案:polyacrylamide (PAM)
第三章测试
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.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
3.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
4.Which of the following methods can recover the adsorption capacity of
sludge in clarifier process? ( )
A:To discharge the sludge completely in the clarifier
B:To generate a pulse to break the large flocs
C:To circulate the sludge mechanically
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
5.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=1°
C:θ=95°
D:θ=150°
答案:θ=85°
;θ=1°
第四章测试
1.The biofilm in slow sand filtration has negative effect on water quality
because it may increase the load of disinfection. （）
A:对 B:错
答案:错
2.The negative water head will not appear in ( ) process(es)?
A:Conventional rapid filter
B:V-shaped filter
C:Siphon filter
D:Valveless filter
答案:Siphon filter
;Valveless filter
3.The expansion rate of single-layer quartz sand is usually about 40%-45%. ( )
答案:对
4.The effective particle size of filter media refers to the particle size of filter
media less than ( ) percent of the total weight after screening.
A:5
B:75
C:80
D:10
答案:10
5.Supporting layer in the filter can also contribute to the uniform distribution
of water to some extent. ( )
A:错 B:对
答案:对
第五章测试
ngmuir isotherm assumes that all surface sites have equal activity, which
means adsorption energy is independent of the extent of surface coverage θ.
( )
A:对 B:错
答案:对
2.In sorption process, film diffusion transport or pore transport is usually the
rate limiting step. ( )
答案:对
3.Activated carbon can react with water treatment agents such as coagulants
and disinfectants. ( )
A:对 B:错
答案:对
4.Adding granular activated carbon in intake structure can extend contacting
time. ( )
A:错 B:对
答案:错
5.In drinking water treatment, activated carbon can be regenerated by organic
solvent extraction, such as methanol, ethanol, benzene, acetone, and ether. ( ) A:对 B:错
答案:错
第六章测试
ually, ozone and chlorine dioxide are much more effective than chlorine,
while chloramine is a weaker disinfectant compared with chlorine. ( )
A:对 B:错
答案:对
2.80℃ water spray is usually employed to promote the evaporation of chlorine.
( )
A:错 B:对
答案:错
3.Security protections for chlorine leakage include positive-pressure chlorine
absorption equipment and negative-pressure chlorine absorption equipment.
Lime or reductants can also be used to adsorb chlorine. ( )
A:错 B:对
答案:对
4.Ozone pre-oxidation can enhance coagulation through destroying the organic
coating on the surface of inorganic matters. ( )
A:错 B:对
答案:对
5.The chemicals and materials used in water treatment can be the precursors
of disinfection by-products. ( )
A:错 B:对
答案:对
第七章测试
1.The filtration rate is constant under constant-pressure filtration mode. ( )
A:错 B:对
答案:错
2.In general filtration operations, the cake layer is actually the main filter
media instead of the membrane itself. ( )
A:错 B:对
答案:对
3.Microfiltration (MF), ultrafiltration (UF) and reverse osmosis (RO) are all
separation processes that utilize pressure difference as the driving force to make solvent (water) pass through the membrane. In general, what is the order of the molecular sizes retained by MF, UF and RO? ( )
A:MF＞UF＞RO B:MF＞RO＞UF C:UF＞MF＞RO D:MF＞RO＞UF
答案:MF＞UF＞RO
4.Which of the following is not a feature of membrane separation technology?
( )
A:Long lifespan
B:High efficiency C:Low energy consumption D:Easy to operate
答案:Long lifespan
5.Which of the following is not an effective measure to reduce the resistance of
concentration polarization? ( )
A:To install a turbulence promoter
B:To clean the membrane regularly
C:To increase the flow rate and mass transfer coefficient
D:To reduce the temperature of feed water
答案:To reduce the temperature of feed water。