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Desalination for Safe Water Supply 22 HSW LU Hours


Quiz Questions

1.Which is not a typical fresh water source for producing potable water?
River
Lake
Deep groundwater
Ocean
2. Desalination processes remove _____________ from seawater and brackish water.
Dissolved salts
Minerals
Dirt
Oxygen
3.The molecular weight cut off for RO membrane performance is typically in the range of __________ daltons for organic chemicals.
50-100
100-300
300-500
Greater than 500
4.During pretreatment a disinfectant, often chlorine, will be added to ________ biofouling and protect the membrane from degradation.
Increase
Reduce
5.Installation and operation of a desalination facility will have the potential for adverse impacts on air quality, water/sea environment, and ground water.
True
False
6.The figure below shows the treatment plant process sequence of a typical plant.

Desalination for Safe Water Supply 1

Post-Treatment
Filtering
Desalination
None of the above
7. _________________ subsurface intakes are more suitable for larger seawater desalination plants.
Vertical
Horizontal
8.Open ocean intakes are suitable for all sizes of seawater desalination plants, but are typically more economical for plants of production capacity higher than ___________ .
20,000 m³/day
30,0000 m³/day
40,000 m³/day
50,000 m³/day
9.The greatest single ecological impediment in selecting the site for a desalination facility is:
Economic Impact
Political Impact
Environmental Impact
None of the above
10.Until the early 1990’s, __________ was the most commonly employed method of seawater desalination.
Multistage flash distillation
Thermal Desalination
11.There is no direct contact between the heating steam system and the desalination process:
True
False
12.Membrane desalination is a process of separation of _____________ from the source water using semipermeable membranes.
Oxygen
Debris
Minerals
None of the above
13.Salt rejection refers to the effectiveness of a membrane to ____________ salts from solution.
Remove
Add
14.Desalination for Safe Water Supply 2

The figure above is an RO membrane with a _____________ pressure pump.

High
Low
15. _______________ is the most widely used disinfection method.
Desalination
Boiling
Chlorination
None of the above
16.Desalination for Safe Water Supply 3

The figure above is of a ______________ unit.

Small distiller
Vapour compression
Desalination
None of the above
17.Pre-treatment of the source after intake water is normally designed to remove contaminants that will interfere with the __________ process such as by scale formation or fouling membranes.
Disinfecting
Post treatment
Desalination
Distilling
18.The quality of the blended water is particularly relevant if mixing of incompletely treated water with desalinated water occurs __________ distribution.
Prior to
After
19.Thermal processes generally require _________ pretreatment than membrane based processes.
More
Less
20.General principles of post-treatment disinfection of desalinated water _______________ those of disinfection of freshwater sources of drinking water.
are similar
vary from
21.Public health addresses:
the quality of life
improvement in community health
potential risks associated directly or indirectly with the desalination project
All of the above