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Water Treatment Plant Operator Test Questions > Sedimentation > Flashcards

Sedimentation Flashcards

1
Q

How many zones are there in a sedimentation tank?

A

4

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2
Q

Which is the largest zone in a sedimentation tank?

A

Settling zone

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3
Q

In a conventional sedimentation tank, how long is the detention time?

A

2-6 hours

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4
Q

What is short-circuiting?

A

When water takes a direct path from the influent to the effluent with out the fully mixing with the contents of the tank.

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5
Q

What do you call the 4 zones in a sedimentation tank?

A

inlet, settling, sedimentation or sludge, outlet

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6
Q

What affects the settling process?

A

temperature and turbidity

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7
Q
  • What are the advantages of a solid contact unit?
A

save on land use, all processes take place in one tank, save on chemicals, ability to adjust the slurry, especially to deal with algae problems,. capital and maintenance cost are reduced.

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8
Q

For the volume over volume test, a _____ sample is taken from the _____ zone, and allowed to settle for____ minutes?

A

100ml / reaction zone / and 5 min

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9
Q

What advice can you give to an operator at a neighboring plant who is experiencing high chemical cost?

A

recirculate chemicals

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10
Q

⭐ when you took sludge samples, you determined that there was too much sludge in the tank. What will you do to correct this problem?

A

Increase the number of blowdowns or increase the duration of the blowdowns or both

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11
Q

Observation of the treatment process indicates that there is not enough sludge in the treatment tank. What action is needed?

A

Reduce the number of blowdowns or their duration/ adjust the recirculation rate

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12
Q

How do you adjust the recirculation rate?

A

Increase or decrease the flow ( some solid- contact units have a sludge recirculation device)

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13
Q

By _____ The recirculation rate, a______ amount of sludge will be held in the tank.

A

Increasing, larger

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14
Q

If the recirculation rate is too high, Will be carried over the_____.

A

Sludge slurry, filter

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15
Q

How are the bottoms of sedimentation tanks and solid contact units configured to aid in sludge removal

A

They are sloped towards the center

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16
Q

What would you install to improve Sedimentation?

A

Tube settlers

17
Q

What affects the efficiency of the tube Settlers?

A

High winds

18
Q

The gathering of a liquid or dissolve substance on the surface or interface zone of another material is called?

A

Absorption

19
Q

An electrical system for the preventing of rust or corrosion of metal surfaces that are in contact with water is called

A

Cathodic protection

20
Q

Indirect filtration, what process is omitted?

A

Sedimentation

21
Q

⭐ a water treatment process in which solid particles settle out of the water being treated is called

A

Sedimentation

22
Q

Put these processes in their correct order- flocculation, filtration, sedimentation, and coagulation.

A

Coagulation, flocculation, sedimentation, and filtration

23
Q

How do you prevent short- circuiting?

A

Install baffles

24
Q

⭐ if an overdose of coagulant occurs, what happens in solid- contact tanks?

A

Sludge settles to rapidly, and there is not enough sludge slurry recirculated

25
Q

⭐ how many sedimentation basins or solid contact units are needed in a water plant?

A

2

26
Q

⭐ how does the operator of a solid-contact unit control the performance of the unit?

A

Adjusting the chemical dose, recirculation rate, and sludge control

27
Q

What factors control the detention time?

A

Flow and tank volume

28
Q

Lower temperatures cause what condition in solid – contact tanks?

A

Slow settling

29
Q

Solid - contact units are most unstable during what conditions?

A

During rapid changes in temperature, flows and turbidity

30
Q

⭐ when there is a large increase in turbidity of the flow to a solid – contact unit, what action is needed?

A

Jar test or increase coagulant dose or change coagulant or increase alkalinity or adjust flash mixer/ flocculator speed/ intensity

31
Q

What will happen if the recirculation rate is too low?

A

Sledge will settle too fast and there will not be enough sludge Recirculating

32
Q

How is pin ink removed?

A

Filtration and or recarbonation

33
Q

What is the best test to evaluate the water treatment process?

A

Turbidity

34
Q

What is the best way to control chemical feed rates/ dosage in a WTP?

A

Electronically controlled chemical feeders

35
Q

A WTP is having problems maintaining its sludge blanket. What action is needed?

A

Adjust recirculation rate

Water Treatment Plant Operator Test Questions (16 decks)

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