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quiz 7 Flashcards

(15 cards)

1
Q

Which parameter is often higher in untreated groundwater as compared to untreated surface water?

A

Hardness

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2
Q

Which parameter is considered a secondary drinking water standard?

A

Odor

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3
Q

What is the sequence of processes used in conventional surface drinking water treatment plants?

A

coagulation, flocculation, sedimentation, filtration, disinfection

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4
Q

What is the major purpose of coagulation-flocculation-sedimentation in a surface drinking water treatment plant?

A

removal of particles

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5
Q

Which chemical is NOT a coagulant that is commonly used in a surface drinking water treatment plant?

A

Magnesium hydroxide

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6
Q

What media are usually used for granular media filtration?

A

sand

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7
Q

What is the major purpose of adsorption in a surface drinking water treatment plant?

A

Removal of natural or synthetic organic molecules and chlorine

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8
Q

Which chemical compound is settled/precipitated by precipitative softening for hardness removal?

A

CaCO3

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9
Q

Which chemical is NOT a disinfectant?

A

Amine

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10
Q

Which process provides residual disinfection?

A

chlorination

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11
Q

Which compound is a much stronger disinfectant?

A

Hypochlorous acid

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12
Q

Under certain conditions, which carcinogenic chemicals may be formed as chlorination by-products?

A

Halo-acetic acids

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13
Q

What is the purpose of secondary (residual) disinfection?

A

to prevent pathogen re-growth in the distribution system

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14
Q

How is CT defined in the context of disinfection?

A

concentration of disinfectant * contact time

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15
Q

Which membrane process is able to remove small particles, dissolved material, and sodium and chloride?

A

Reverse-osmosis

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