WQA 2011 Educational Newsletter Quiz 3

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Filtration Processes (.25 CPD)
6/8 Required to pass

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1. What is the definition of filtration?

A. Conversion of dissolved solids into suspended particles

B. Separation of suspended solids from liquids

C. Evaporation of liquid to create solid particles

D. Exchanging of undesirable particles for desirable particles in a liquid

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2. What is the minimum size particle that can be removed by media filters?

A. 0.200 microns

B. 2.00 microns

C. 10.0 microns

D. 1,000 atomic mass units

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3. Surface filtration is often described as what type of process?

A. Electrostatic attraction

B. Adsorption

C. Loose media

D. Straining

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4. What is a disadvantage of surface filtration?

A. Poor attraction between the particles and the surface

B. Surface clogs easily

C. High capital costs

D. Difficult to operate

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5. What is the basic design of depth filtration that is responsible for accomplishing separation?

A. Incorporation of a strainer to trap larger particles

B. Creation of irregular pathways for water with entrapment for particles

C. Initial deposition of large particles

D. The ability of small particles to pass through the media bed

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6. What causes turbidity?

A. Cloudiness

B. Color

C. Large suspended particles

D. Small suspended particles

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7. What level of turbidity triggers a mandatory “boil water “alert in public water systems?

A. 0.05 NTU

B. 0.5 NTU

C. 5.0 NTU

D. 50 NTU

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8. Other than membranes, what can be used to remove turbidity-causing particles too small for separation by conventional filter media?

A. Coagulation

B. Chlorination

C. Ion Exchange

D. Settling

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