Water Treatment Plant Operation Volume 2 Chapter 16
.
- 1.All available water supplies can be classified according to mineral quality
- A.
True
- B.
False
- 2.Osmosis is the passage of a fluid from a weak solution into a more concentrated solution across a semipermeable membrane
- A.
True
- B.
False
- 3.The water permeable (a) and the mineral permeability (b) Constance a characteristics of the particular membrane that is used in the processing it received
- A.
True
- B.
False
- 4.The water flux increases is mineral count content of the feed increases because the osmotic pressure contribution increases with increasing mineral content
- A.
True
- B.
False
- 5.Under ideal condition for a reverse osmosis unit (pure feed water and no fouling of the membrane surface), there is no change in water flocks with time
- A.
True
- B.
False
- 6.With a reverse osmosis unit, divalent ions, such as calcium and sulfate, are better rejected than monovalent ions such as sodium and chloride
- A.
True
- B.
False
- 7.In the reverse osmosis operation as the temperature of the water increases, flux decreases
- A.
True
- B.
False
- 8.Water is transmitted through the membrane and a much more rapid rates than minerals
- A.
True
- B.
False
- 9.Reverse osmosis modules provide a large surface area for the attachment and growth of bacterial slams and molds
- A.
True
- B.
False
- 10.When operating an electrodialysis unit, any process problems discovered must be acted upon immediately
- A.
True
- B.
False
- 11.What is the term flux used to describe
- A.
The feasibility of the membrane to remove salinity
- B.
The flexibility of the semipermeable membrane
- C.
The fluctuations in flow through the semipermeable membrane
- D.
The rate of water flow to miss any permeable membrane
- 12.What could be the cause of a decrease in flux in a reverse osmosis unit
- A.
Membrane compaction
- B.
Membrane expansion
- C.
Membrane maintenance
- D.
Membrane temperature differential
- 13.What is the purpose of demineralization
- A.
To Deionize water
- B.
To determine water hardness
- C.
To recover and recycle minerals
- D.
To separate minerals from water
- 14.How is recovery defined demineralization process
- A.
The amount of minerals recovered for products sale
- B.
The percentage of feed flow that is recovered as product water
- C.
The percentage of feed salinity that is recovered as reject
- D.
The return of the membrane to original performance levels
- 15.Why is acid added as a pretreatment step before demineralization and using cellulose acetate membranes
- A.
To control corrosiveness
- B.
To increase hydrolysis
- C.
To reduce compaction
- D.
To slow hydrolysis
- 16.What is concentrated polarization
- A.
A buildup of retained particles on the membrane surface due to be watering of the feed closest to the membrane
- B.
A concentration of minerals and the reject or recovery water
- C.
In mixing of water stew neutralize (polarize) the ionic content of the water
- D.
A polarization of minerals and the reject or recovery water
- 17.What is the most common serious problem resulting from concentration polarization
- A.
Compaction of the membrane
- B.
Increasing tendency of precipitation of sparingly soluble salts and deposition of particle matter on the membrane surface
- C.
Leakage of salts and particulate matter through the membrane
- D.
Reduction and maintenance requirements
- 18.Provisions should be made for flushing reverse osmosis units under what conditions
- A.
When consumers complain of flavor and older problems
- B.
When iron bacteria cause rust or orange and water problems
- C.
When necessary to comply with a lead and copper rule
- D.
When treating seawater brackish water with high organic content
- 19.Which scale inhibitor is most frequently used to prevent the coding of the reverse osmosis membrane
- A.
None ionic polymer
- B.
Soda ash
- C.
Sodium hexametaphosphate
- D.
Sulfuric acid
- 20.What is the most common problem in Electrodialysis (ED) operation
- A.
Compacting of the membrane due to lack of washing
- B.
Corroding the membrane by an acidic solutions
- C.
Scaling or fouling of the membrane by both organic and inorganic materials
- D.
Tearing of the membrane by abrasive materials tearing of the membrane by abrasive materials
- 21.Which factors are contributing to The increased salinity of many rivers and lakes
- A.
Agricultural runoff
- B.
Coagulation/flocculation
- C.
Filtration
- D.
Moisture condensation
- E.
Waste discharge
- 22.What are the advantages of thin-film composite membranes when comparing with cellulose acetate membranes
- A.
Higher costs
- B.
Higher rejection And flux rate
- C.
Lower salt passage rate increase after three years
- D.
Subject to biological attack
- E.
Subject to hydrolysis or compaction
- 23.The mineral(salt) flux (mineral passage)Through a membrane depends on which factors
- A.
Concentration gradient across the membrane
- B.
Mineral permeability constant
- C.
Osmotic pressure differential across the membrane
- D.
Pressure differential applied across the membrane
- E.
Water permeability constant
- 24.Which impurities can be deposited or the grow on the membrane surface of a reverse osmosis unit
- A.
Alkalinity
- B.
Bacteria
- C.
Dissolved in organics
- D.
Dissolved organics
- E.
Suspended solids
- 25.Where should something about be located on reverse osmosis
- A.
On the concentrate line
- B.
On the feed line
- C.
On the permeate line
- D.
On the permeated line of the pressure vessel
- E.
On the work bench of each lap technician
Questions: 20 | Attempts: 11144 | Last updated: Apr 2, 2021
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Sample QuestionMany sources of water are directly suitable for drinking purposes without treatment.
Questions: 30 | Attempts: 4823 | Last updated: Mar 17, 2021
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Sample QuestionNeither plant life nor animal life depend upon water for survival.
Questions: 50 | Attempts: 4436 | Last updated: Dec 26, 2019
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Sample QuestionSmaller sized particles, such as bacteria and fine clays andsilts, readily settle out of water.
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