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Wastewater Grade - V-2018 > Multiple Choice > Flashcards

Multiple Choice Flashcards

1
Q

Besides chlorine, what other chemicals can be used to control odor?

a. Hydrogen peroxide and sodium hyperchlorite
b. Alcohol
c. Dichloroamine
d. Benzene

A

a. hydrogen peroxide and sodium hyperchlorite

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2
Q

MO that can use either combined or molecular oxygen are called?

a. facultative organisms
b. aerobic organisms
c. anaerobic organisms
d. rotifers

A

a. facultative organisms

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3
Q

Hydrogen sulfide cause the most problems at?

a. pH > 11
b. pH< 5
c. pH = 7
d. pH > 12

A

b. pH < 5

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4
Q

Odors in air can be treated by

a. absorption
b. adsorption
c. oxidation
d. All of the above

A

d. All of the above

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5
Q

Trickling filter parts include:

a. blower
b. distribution system
c. missing pump
d. MLSS

A

d. MLSS

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6
Q

You should learn when writing reports to

a. avoid making repetitive statements.
b. make the report thick so people will understand what you are writing about
c. leave out important information if it put you in a bad light
d. avoid difficult matters as these are best discussed in private.

A

a. avoid making repetitive statements

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7
Q

The DO test should be run:

a. immediately on site
b. after mixing well
c. after letting the sample sit for at least 2 hours at 4ºC
d. after saturating the sample with oxygen

A

a. immediately on site

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8
Q

One way to dechlorinate a plant effluent is with

a. sodium bisulfate
b. sodium chloride
c. there is no way to dechlorinate a plant effluent
d. Dechlorination is never done at a wastewater plant

A

a. sodium bisulfate

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9
Q

Liquid sulfur dioxide hazards include

a. explosions
b. body tissue freezing
c. asphyxiation
d. b and c

A

d. b and c

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10
Q

sulfonation system parts include:

a. evaporator
b. pump
c. recording chart
d. media filter

A

a. evaporator

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11
Q

Sprinkler irrigation hazards include

a. faulty electrical equipment
b. water being sprayed into power lines
c. drowning
d. a and b

A

d. a and b

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12
Q

For wastewater land disposal, which of the following test should be performed?

a. Cation exchange capacity
b. Conductivity
c. pH
d. all the above

A

d. All the above

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13
Q

Ponding in a land disposal system may be caused by

a. soil sealing
b. broken lines
c. excessive application rates
d. All of the above

A

d. all of the above

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14
Q

Salt build up in soil can be corrected by

a. adding acid or bases to dissolve the salts
b. applying fresh water to leach out the salts
c. turning the soil to a depth of 4 to 5 feet
d. b and c

A

b. applying fresh water to leach out the salts

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15
Q

The first sign that an anaerobic digester is becoming stuck is normally

a. a pH change
b. a decrease in gas production
c. a change in the volatile acid/alkalinity relationship
d. an increase in the amount of hydrogen sulfide gas

A

c. a change in the volatile acid/alkalinity relationship

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16
Q

Which statement(s) regarding ferric chloride is false

a. Ferric chloride is corrosive
b. Positive displacement pumps should be used with ferric chloride
c. Ferric chloride should be treated in the same manner as an acid
d. Ferric chloride will not discolor other materials

A

d. Ferric chloride will not discolor other materials

17
Q

Microstraining may

a. reduce the coliform group organisms
b. reduce the organic loading on the receiving waters
c. disinfect the effluent
d. a and b

A

d. a and b

18
Q

When filling a filter the inlet valve should not be used to provent:

a. an unnecessary load from being placed on the troughs b. wasting production water
c. falling water from disturbing the media bed
d. a and c

A

b. wasting production water

19
Q

A damaged filter under drain may be indicated by

a. filter media in the effluent
b. solids in the effluent
c. quiet and foiling areas during back washing
d. All of the above

A

d. All of the above

20
Q

In order for a pond to be functioning correctly ____ must be taking place:

a. photosynthesis
b. rapid temperature changes
c. rapid pH changes
d. rapid DO changes

A

a. Photosynthesis

21
Q

One accurate method to measure a liquid level is:

a. with bubbler tubes
b. to approximately the liquid depth
c. to approximate the liquid tank diameter
d. There are not accurate ways to measure liquid level

A

a. with bubbler tubes

22
Q

A pH meter

a. can be used to indicate if a liquid is an acid or base
b. is never used in a wastewater plant
c. is too complex for an operator to use
d. should never be calibrated

A

a. can be used to indicated if a liquid is an acid or base

23
Q

High effluent nitrogen concentration may cause

a. potential health hazards to newborn infants
b. ammonia toxicity to fish
c. DO depletion in the receiving waters
d. All of the above

A

d. All of the above

24
Q

Successful operation of a supended growth reactor depends upon:

a. proper chlorine residue
b. DO concentration
c. hydraulic and solids loading
d. b and c

A

d. b and c

25
Q

What activated sludge process is best for nitrogen removal?

a. conventional of plug flow
b. complete mix
c. step-feed
d. contact stabilization

A

a conventional of plug flow

26
Q

Nitrogen removal may be accomplished by:

a. ammonia stripping
b. breakpoint chlorination
c. denitrification
d. All of the above

A

d. All of the above

27
Q

One wastewater plant area where explosive gasses never occur is :

a. the headworks
b. near the anaerobic digester
c. in underground vaults
d. explosive gasses can occur in any plant area

A

d. explosive gasses can occur in any plant area

28
Q

A high water level alarm

a. is normally installed at the headworks
b. is never used in wastewater plants
c. indicates that the flow is decreasing
d. is not needed if the plant is manned 24 hours a day

A

a. is normally installed at the headworks

29
Q

Sludge blanket depths

a. are normally 2-4 feet deep
b. do not effect clarifier operation
c. should be at lease 6 feet in depth or proper clarifier operation
d. should be measured at different times each day

A

a. are normally 2-4 feet deep

30
Q

Secondary effluent solids can be removed by

a. addition of chemicals.
b. filtration
c. microscreens
d. All of the above

A

d. All of the above

31
Q

Chemicals used to improve the settling of solids include

a. alum
b. cations
c. lime
d. a and c

A

d. a and c

32
Q
A
33
Q
A
34
Q
A

Wastewater Grade - V-2018 (1 decks)

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