Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

Water Treatment Plant Operator Test Questions > Coagulation And Flocculation Questions > Flashcards

Coagulation And Flocculation Questions Flashcards

(50 cards)

Start Studying
1
Q

What you call the clumping together of very fine particles into large particles (floc) after the edition of a chemical?

A

Coagulation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

WTP operators are mainly concerned with particles that have what type of charge?

A

Negative charge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

The capacity of water to neutralize acid is called?

A

Alkalinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What parameter is measured when water is titrated with 0.2 N (H²SO⁴) to a pH of 4.5?

A

Total alkalinity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Water color that includes not only the color due to substances in the water, but suspended matter as well is called?

A

Apparent color

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Water color that includes not only the color due to substances in the water, but suspended matter as well is called?

A

Apparent color

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

Water color of a sample that has had turbidity removed is called ?

A

True color

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

A polymer that has a positive charge is?

A

Cationic polymer

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

A polymer that is often used as a filter aid is called?

A

Non-ionic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Where is the filter aid added?

A

Filter influent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

A negatively charged polymer is called

A

Anionic

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

A collection of individual samples obtained at regular intervals, usually every one or two hours during a 24-hour period and combined in proportion to the flow is called?

A

Composite sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

⭐ A contaminant formed by the reaction of disinfection chemicals, with other substances in the water being disinfected is called?

A

Disinfectant by- product ( DBP)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

The gathering together of fine particles after coagulation to form large particles by a process of gentle mixing is called?

A

Flocculation

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

A single sample of water collected at a particular time and place, which represents the composition of the water only at the time and place, is called?

A

Grab sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

What test is used to determine the correct chemical dose during water treatment?

A

Jar test

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

⭐ The sum of the atomic weight of the element in a compound is used to determine?

A

Molecular weight

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

A sample portion of water that is as nearly identical in content and consistency as possible to that in the larger body of water being sampled is called?

A

Representative sample

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

⭐ a condition that occurs in tanks or basins when some of the flowing water entering a tank or basin flows along a nearly direct pathway from the inlet to the outlet is known as?

A

Short- circuiting

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

⭐ The cloudy appearance of water caused by the presence of suspended and colloided matter is called?

A

Turbidity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

⭐ What parameter is obtained when you measure the optical property of water based on the amount of light reflected by suspended particles?

22
Q

What are three types of solids found in water?

Study These Flashcards
A

Settable, suspended, and dissolved

23
Q

When the coagulant sodium aluminate is added to water, what happens to the pH?

24
Q

When aluminum Sulfate (alum) is added to the water. What happens to the pH?

Study These Flashcards
A

The pH goes down

25
When the alum dosage is decreased, what generally happens with the lime dosage?
Lime dosage decrease
26
When the alum dosage is increased, what normally takes place with the lime dose?
Lime dosage increases
27
A physical and chemical reaction occurring between the alkalinity of the water and the chemical added which results in the formation of insoluble floc is called?
Coagulation
28
When using alum as a coagulant, the most effective pH range for the water is?
Between 5 and 7 pH
29
What is the best pH range for coagulation?
It depends on the coagulant used
30
What water treatment process is known as "flashmix"?
Coagulation
31
The coagulation process requires what amount of detention time?
Less than a minute, a few seconds
32
The flocculation process takes place in what length of time?
5 to 30 minutes
33
Reducing the speed of the mixers in each succeeding tank to lower the turbulence is called?
Tapered energy mixing
34
What type of floc should be formed during flocculation?
Discrete and fairly dense, popcorn. Flake
35
What is considered the best chemical dosage obtained during coagulation?
The dosage, which produces finish water that meets drinking water standards at the lowest cost.
36
During the jar test, the floc starts to settle before the mixer is turned off, and 80% of the floc is settled within 1 to 2 minutes. What does this indicate?
Overdosage
37
Jar tests are useless unless?
Applied and verified
38
During a jar test, the floc starts settling after the mixer is turned off and 80% of the flock settles within 15 minutes. What does this indicate?
Good settling dosage
39
During a plant tour, the operator notices a small, well dispersed floc throughout the flow. What action is needed?
None. This is good treatment
40
⭐ If the operator does not notice a small, well-dispersed floc, what is a likely cause?
Chemical dosage or feed rate too low; flash mixer not providing effective mixing
41
The water treatment plant is using alum as a coagulant. The floc being formed is tiny. What does this indicate?
Under dosage
42
In the solids contact unit, the water appears to have a bluish tiny or milky color. What is the likely cause?
Overdose of alum
43
As the floc enters the flocculation basin, the size of the floc increases. As it flows through the basin the floc starts to break up. What is the likely cause?
Flocculator/ floc mixer speed too high
44
In question 43, what action is needed to correct the problem?
Reduce flocculator speed or increase dosage
45
⭐ during a plant tour, the operator notices floc flowing over the laundering Weirs. What is the likely cause?
Floc too light for the detention time produced by the flow rate / coagulant underdosage / alkalinity too low
46
⭐ in problem 45, alum is the coagulant being used. The floc is too tiny and has a very fine appearance. What is the likely cause?
Alum underdose, correct by increasing the dosage.
47
If alkalinity is an important factor in coagulation, what parameters in the water must the operator measure?
Alkalinity
48
⭐ if the turbidity of the raw water increases, what action is usually taken to ensure good coagulation?
Increase coagulant dosage
49
When water temperature decreases, what action is needed to ensure good coagulation?
Increase coagulant dosage
50
In enhanced coagulation, where is the acid added?
Prior to coagulation

Water Treatment Plant Operator Test Questions (16 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions