Water Treatment Review 2

Front 1

The variation in water demand during the course of the day is termed:

Back 1

Diurnal variation

Front 2

The slope of the hydraulic grade line is due to:

Back 2

Friction loss

Front 3

The difference between water pressures upstream and downstream of a pump when it is not in operation is known as the:

Back 3

Total static head

Front 4

Static suction head plus friction suction head plus static discharge head plus friction head is a pumps:

Back 4

Total dynamic head

Front 5

A completely fail safe means of backflow prevention is:

Back 5

An air gap

Front 6

Pumps are primed to

Back 6

Replace air inside the pump with water.

Front 7

What is an example of a positive displacement pump?

Back 7

Reciprocating pump

Front 8

A backflow prevention device that can be used in any situation is a:

Back 8

Reduced pressure zone device

Front 9

The term chain of custody refers to:

Back 9

Procedures and documentation required for water quality sampling.

Front 10

Bacteriological samples for a distribution system must be collected in accordance with:

Back 10

An approved sample sitting plan

Front 11

The first step in the multiple tube fermentation analysis is called the:

Back 11

Presumptive test.

Front 12

An organism that can cause disease is known as:

Back 12

A pathogen

Front 13

Which of the following is not a characteristic of coliform organisms?

Back 13

They are not far less numerous than pathogenic organisms.

Front 14

The presence of coliform bacteria in a distribution system:

Back 14

Indicates that pathogenic organisms may be present also.

Front 15

The unique ingredient in the confirmed test of the MPN method is:

Back 15

Brilliant green bile

Front 16

The maximum disinfectant residual in a distribution system is:

Back 16

4.0 mg/l

Front 17

Primary and secondary drinking water standards are normally established with a :

Back 17

Maximum contaminant level

Front 18

The lowest concentration that can be officially reported for any constituent in a water sample is known as:

Back 18

The detection level for reporting

Front 19

Flocculation and sedimentation are examples of:

Back 19

Physical treatment processes

Front 20

The term for the waste stream generated by a sedimentation process is referred to as:

Back 20

Sludge

Front 21

Charge neutralization coagulation is accomplished by the surface action of:

Back 21

Charged intermediate species of the primary coagulant

Front 22

The most effective means of mixing a primary coagulant into the raw water is:

Back 22

Pumped injection mixers

Front 23

The main purpose of coagulation is to:

Back 23

Destabilize colloidal particles

Front 24

The purpose of flocculation is to :

Back 24

Increase particle size.

Front 25

Compared to charge neutralization coagulation, sweep coagulation:

Back 25

Requires more chemical, and produces more sludge.

Front 26

The exit weirs of a sedimentation basin are also known as:

Back 26

Launders

Front 27

A common form of sludge removal in rectangular sedimentation basins is:

Back 27

Chain and flight collectors.

Front 28

Most particles removed in a high rate filter are removed by the mechanism of:

Back 28

Adsorption

Front 29

A polymer added to the effluent of the sedimentation process is called a :

Back 29

Filter aid

Front 30

The measurement of the pressure drop through a filter bed is usually known as:

Back 30

Head loss or loss of head

Front 31

The mechanically constructed feature that forms the bottom of a filter is called the:

Back 31

Underdrain

Front 32

Gravel, fine sand, and coarse sand can all be considered:

Back 32

Suspended solids

Front 33

A chemical that is frequently applied just prior to filtration is:

Back 33

Anionic or nonionic polymer

Front 34

The most common reason for ending a filter run is:

Back 34

Terminal head loss

Front 35

The maximum pressure drop that a filter can experience is called:

Back 35

Terminal head loss

Front 36

Rapid sand filtration is most commonly associated with:

Back 36

Direct filtration and conventional treatment

Front 37

When fresh, the typical concentration of sodium hypochlorite solution is:

Back 37

12.5%

Front 38

Trihalimethanes are classified as :

Back 38

Volatile organic compounds

Front 39

Which is the most effective disinfectant?

Back 39

Hypochlorous acid

Front 40

A field chlorine residual measurement shows no reading at one minute, but 2.1 mg/l after three minutes. This indicates that:

Back 40

There is no free chlorine residual, but there are 2.1 mg/l of chloramines.

Front 41

Residual chlorine refers to:

Back 41

The amount of chlorine in the chlorinated water after a selected time.

Front 42

The chlorine demand abruptly jumps in your source water. This may indicate that:

Back 42

The water source has been contaminated.

Front 43

The maximum rate of withdraw of gas from a one ton chlorine container in 24 hours is:

Back 43

400 pounds

Front 44

If you encounter a chlorine leak in a one ton container, what action should you take first, to reduce the severity of the leak?

Back 44

Rotate the container to place the leak at the top.

Front 45

When chlorine gas is mixed with water, what chemicals are formed?

Back 45

Hypochlourus acid and hydrochloric acid.

Front 46

As pH of a water supply increases:

Back 46

More chlorine is required to achieve the same level of disinfection.

Front 47

A common means of estimating water corrosiveness is the:

Back 47

Langlier index