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Water Treatment Plant Operator Test Questions > Filtration > Flashcards

Filtration Flashcards

1
Q

The release of dissolved Air in saturated cold water due to a decrease in pressure causes Which of the following?

A

Air binding

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2
Q

The color in filtered water is called?

A

True color

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3
Q

What is the final step for removal of suspended solids?

A

Filtration

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4
Q

What FAC chapter addresses drinking water standards, monitoring, and reporting?

A

FAC 62-550

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5
Q

Inaccurate test results are generally due to?

A

Poor sampling techniques

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6
Q

What is the highest possible turbidity reduction expected when operating a filtration process under optimum conditions ?

A

99.5%

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7
Q

How is pin point floc removed?

A

Filtration

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8
Q

Direct filtration omits which process?

A

Sedimentation

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9
Q

What are the main removal mechanisms in a filter?

A

Absorption and sedimentation

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10
Q

Sand drying beds are similar to what type of filters?

A

Gravity sand filters

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11
Q

Which of the following coagulants is generally used as a filter aid?

A

Non-ionic polymer

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12
Q

What parameters are used to determine when to backwash a filter?

A

Head loss, turbidity, and time

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13
Q

Where is the application point for a filter aid?

A

Filter influent

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14
Q

Before starting the backwash process, what must you check first?

A

Water supply

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15
Q

Mud balls are caused by which of the following?

A

Improper backwash

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16
Q

During a plant walkthrough, and operator discovers a filter is air bound. What action should they take?

A

Backwash the filter immediately

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17
Q

Media boils are caused by?

A

High backwash rates

18
Q

What is the main goal of filtration?

A

Removal of turbidity

19
Q

What is the fourth step in the backwash process?

A

Start the surface scours

20
Q

How should an air bound filter be Backwash?

A

Slowly

21
Q

The color in unfiltered water is called

A

Apparent color

22
Q

After backwashing a filter, there is a high initial head loss. What is most likely cause?

A

Insufficient backwash

23
Q

What causes air binding?

A

Operating the filter at high head loss too long or the release of O2 in saturated cold water due to a decrease in pressure

24
Q

During a plant tour, an operator noticed the filter 16 has a sudden increase in head loss. What action should they take?

A

Do a jar test

25
Q

What do you call the process of reversing the flow of water through filter media to remove trapped particles?

A

Filter backwash

26
Q

The common boundary layer between two substances such as water and a solid is called?

A

Interface

27
Q

⭐. The difference between the water surface and the media surface is called

A

Submergence ( head)

28
Q

What is the filter rate in GPM/ sq ft of slow sand filters?

A

0.015 - 0.15 GPM/ sq ft

29
Q

⭐. High water temperatures require what type of backwash rates?

A

Higher backwash rates

30
Q

The filter backwash will requires the backwash water to be sent where after dewatering the sludge?

A

Upstream of all conventional or direct filtration systems ( includes coagulation, filtration, and sedimentation)

31
Q

⭐. What is the ripening period of a filter?

A

This occurs at upstart of the new filter and after backwashing a filter

32
Q

What is the backwash rise rate in inches/minute if the backwash flow rate is 35 GPM/SQ FT?

A

56 IN/ min

33
Q

***What is the backwash pumping rate in GPM for a filter 20 ft long and 30 ft wide with a desired backwash rate of 25 GPM/ square foot?

A

15,000 GPM

34
Q

During a filter run, flow through the filter was 12.8 million gallons. It took 120,000 gallons to backwash the filter. What percent of the filter’s water production was used for Backwashing?

A

1%

35
Q

⭐. What is the minimum treatment required for drinking water by the surface water treatment rule? ( SWTR)

A

Filtration and disinfection

36
Q

⭐. Where should you install a particle counter at a WTP (water treatment plant)?

A

As close as possible to the point of measurement

37
Q

⭐. The length of a sample line of a particle counter should be how long?

A

As short as possible

38
Q

⭐. Pumping sample water to the particle counter may cause what problem?

A

Air bubbles, which may be erroneously counted as particles

39
Q

⭐. What material is recommended for the sample line of a particle counter?

A

Black nylon with Hytril liner

40
Q

What is the final step for removal of suspended solids?

A

Filtration

Water Treatment Plant Operator Test Questions (16 decks)

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