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Water Treatment Plant Operator Test Questions > Demineralization > Flashcards

Demineralization Flashcards

1
Q

Specific conductance is the indirect measurement of what parameter?

A

TDS ( total dissolved solids)

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2
Q

The TDS ( total dissolved solids) is what percent of the specific conductance?

A

70%

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3
Q

What is the pumping pressure used in RO ( reverse osmosis) treatment?

A

500-1200 PSI

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4
Q

What is the pumping pressure used in a membrane softening?

A

100 - 500 PSI

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5
Q

What is a pretreatment process in RO ( reverse osmosis) treatment?

A

Add acid ( sulfuric acid)

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6
Q

What is the purpose of pre-filters?

A

Particulate safeguards

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7
Q

To increase the flow through the membrane in RO ( reverse osmosis) treatment, what action is needed?

A

Increase pumping pressure

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8
Q

When the feed water temperature increases, what happens?

A

Product water increases

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9
Q

What is the TDS ( total dissolved solids) content of seawater?

A

35,000 mg/L

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10
Q

When pressure is increased in RO treatment, what reaction happens with the mineral flow?

A

Mineral flow is not affected by the PSI increase

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11
Q

Why is acid added to RO pre-treatment?

A

Prolong life of cellulose acetate membrane and prevent/control scaling

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12
Q

What is used to clean fouled membranes?

A

Citric acid and bactericide

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13
Q

When the water pressure must be increased by 15%, what action is needed?

A

Clean membranes

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14
Q

When recovery decreases by 15%, what action is needed?

A

Clean membranes

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15
Q

What do you call the decline in flow due to fouling and membrane compaction?

A

Flux decline

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16
Q

By arranging the membranes in a Christmas tree configuration, what recovery percent is normal?

A

85% or better?

17
Q

What type of pump is used for desalination of water?

A

Positive displacement

18
Q

What type of pump is used for membrane softening?

A

Centrifugal

19
Q

If the brine valve is fully closed, what happens to the recovery percentage?

A

100% recovery and damage to the membranes

20
Q

What type of piping is used for desalinating water?

A

high grade stainless steel

21
Q

To minimize concentration polarization, what action is necessary?

A

Create turbulence by varying flow velocity

Water Treatment Plant Operator Test Questions (16 decks)

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