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Water Treatment > Water Treatment HW #1-8 > Flashcards

Water Treatment HW #1-8 Flashcards

1
Q

Which is a part of the hydrologic cycle?
-accumulation
-perspiration
-condensation
-transdermal respiration

A

Condensation

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2
Q

turbidity is:
the alkalinity of the water
the hardness of the water
the corrosiveness of the water
the cloudiness of the water

A

the cloudiness of the water

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3
Q

Surface water tends to have increased
-contamination
-organic carbon
-turbidity
-all of the above

A

all of the above

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4
Q

a conventional water treatment plant process order is:
-Pretreatment, treatment, post treatment.
-Screening disinfection, sedimentation, filtration.
-Coagulation, flocculation, sedimentation, filtration, disinfection.
-Disinfection, coagulation, flocculation, filtration.

A

-Coagulation, flocculation, sedimentation, filtration, disinfection.

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5
Q

Traveling screens remove:
-alkalinity
-both a & c
-protozoa
-solids in the water

A

-solids in the water

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6
Q

Which are a common coagulant
-alum
-ferric sulfate
-copper sulfate
-both a & b

A

-both a & b

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7
Q

Filtration removes:
-pin point floc
-protozoa
-turbidity
-all of the above

A

-all of the above

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8
Q

common disinfectants include:
-ferric chloride
-chlorine
-alum
-all of the above

A

-chlorine

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9
Q

Sterilization is defined as:
-selective destruction of inactivation of pathogens
-a practice used to make water safe to drink
-destruction of all organisms
-a practice of all organisms

A

-destruction of all organisms

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10
Q

the finished water from a treatment plant is stored:
-in a reservoir
-in the clear well
-in a water well
-underground

A

-in a reservoir
-in the clear well

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11
Q

MCL is an acronym for ___
-Most common limit
-Maximum chemical level
-Maximum contaminate limit
-Minimal chemical listing

A

Maximum contaminate limit

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12
Q

A public water system serves a minimum of ___ services, or ___ people for ___ or more days per year
-15, 20, 30
-15,25,60
-20, 30, 60
-20, 40, 90

A

15, 25, 60

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13
Q

Transient non community water system are required to sample for ___.
- synthetic organics
-nitrates and coliform
-disinfection by products
-aesthetics

A

nitrates and coliform

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14
Q

Stage 1 disinfection by product rule set the MCL for the THM’s at ___.
-.08 mg/L on a running annual average
-.08ug/L on a locational running annual average
-80 mg/L on a running annual average
-80ug/L on a locational running annual average

A

.08 mg/L on a running annual average

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15
Q

Stage 2 disinfection by product rule changed compliance (sampling) points adding maximum residence time and set the MCL for the THM’s at ___.
-.08 mg/L on a running annual average
-.08ug/L on a locationa running annual average
-80 mg/L on a running annual average
-80ug/L on a locational running annual average

A

80 ug/L on a locational running annual average.

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16
Q

The primary goal of enhanced coagulation, is to ___.
-remove protozoa
-remove organic carbon
-remove turbidity
-remove pathogens

A

remove organic carbon

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17
Q

The MCL for total Chlorine is ___.
-.4 u/L
-4.0 u/L
-4.0 mg/L
-40 mg/L

A

4.0 mg/L

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18
Q

The objectives of the IESTWTR and LT1SWTR is to reduce ___
-chemical contamination
-pH
-harmful organisms
-organic carbon

A

harmful organisms

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19
Q

The IESWTR requires that the filter effluent be ___, ___% of the time
-<03 ntu, 95
-< 0.3 ntu, 95
-< 0.3 ntu, 99
-<0.3 ntu, 99

A

_< 0.3 ntu, 95

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20
Q

The IESWTR requires that the removal rate for virus’ is a ___ log, or ___%
-1, 90
-2, 99
-3, 99.9
-4, 99.99

A

4, 99.99

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21
Q

The total coliform rule sets the MCL at ___ samples per ___.
-5% of, week
-5% of, month
->5% of, month
->5% of, year

A

5% of, month

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22
Q

The action level for lead and copper are ___ and ___ respectively
-1.5 mg/L, 13 mg/L
-0.15 mg/L, 13 mg/L
-0.015 mg/L, 13 mg/L
-0.0015 mg/L, 1.3 mg/L

A

0.015 mg/L, 13 mg/L

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23
Q

The hydrologic cycle phases are ____.
-Precipitation, condensation, transcendentalism
-condensation, evaporation, precipitation
-evaporation, precipitation, condemnation
-participation, condensation, evaporation

A

Condensation, evaporation, precipitation

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24
Q

An aquifer is ___.
-the upper surface of a saturated zone
-a porous water bearing geologic formation
-confined by an upper and a lower layer
-under the direct influence of surface water

A

a porous water bearing geologic formation

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25
Q

The wooer layer of a stratified lake is the ___?
-epilimion
-metalimnion
-hypolimion
-thermocline

A

epilimnion

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26
Q

What is the minimum depth the conductor casing in a sanitary seal?
-10 feet
-25 feet
-50 feet
-75 feet

A

50 feet

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27
Q

The drawdown of a well is ___
- the distance between the surface and the water table
-the distance between the surface and the water table when the pump is running
- the difference between the static water level and the running water level
-the distance between the surface and the static water level

A

the difference between the static water level and the running water level

28
Q

Sedimentation primarily uses ___ to remove floc after coagulation and flocculation
-alum
-baffles
-gravity
-weirs

A

gravity

29
Q

The maximum surface overflow rate is ___
-0.5 gpm/cf
-0.5 gal per hour/ sf
-0.5 gal per day/ sf
-0.5 gpm /sf

A

0.5 gpm/ sf

30
Q

Detention time in the sedimentation basin/ clarifier is nominally ___
-45 minutes
-1 hour 30 minutes
-3hours
-4 hours

A

4 hours

31
Q

Excessive surface overflow rates can lead to ____
-long detention times
-lower filter run times
-less effective contact time
-increase filter efficiency

A

lower filter run times

32
Q

Horizontal velocity thorough a sedimentation basin should not exceed ___
-0.5 feet per sec
-0.5 feet per min
-0.5 feet per sec/ cu ft
-0.5 feet per minute/ cu ft

A

0.5 feet per minute

33
Q

The maximum flow through a weir should be no greater than ___.
-20gpm/ foot
-20 cu ft/ hour
-20,000 gallons per day
-20,000 gallons per day/ foot

A

20,000 gallons per day/foot

34
Q

Plate and tube settlers can increase the surface overflow rate by increasing ___.
-coagulant dosage
-detention time
-density of floc
-surface area in basin

A

surface area in basin

35
Q

A slow sand filter uses ___ of the filer volume, to filter out contaminates.
-top few inches
-half
-most
-all

A

top few inches

36
Q

rapid sand filters require ___
-coagulation and flocculations
-sedientation
-disinfection
-contact time

A

coagulation and flocculations

37
Q

filter ripening is dependent on ___ to adhere to the media
-absorption
-back washing
-adsorption
-sticky particles

A

adsorption

38
Q

excessive head loss in the filter bed, can lead to ___
-increased filter run times
-reduction of mud balls
-increased filter efficiency
-air binding

A

air binding

39
Q

Sudden flow changes are___ for filter operation.
-inconsequential
-detrimental
-beneficial
-required

A

detrimental

40
Q

filter back-washing removes particle by ___
-forcing particles away
-chemically destroying particles
-oxidation of particles
-scrubbing sand grains against each other

A

scrubbing sand grains against each other

41
Q

When back washing a filter the amount of water used should be ___ gal per sq ft
-25-75
-75-100
-100-150
-150-200

A

100-150

42
Q

Filter efficiency should produce ___NTU ___% of the time
- _< 0.03, 95
- _< 0.03, 90
- _< 0.3, 95
- < 0.3, 90

A

_< 0.3, 95

43
Q

When raising pH for precipitate softening. which of the following cannot be used?
-carbon dioxide
-caustic soda
-lie
-soda ash

A

carbon dioxide

44
Q

Langelier index ___ tends to corrode.
-<0
-<1
->0
->1

A

<0

45
Q

Equestrian keeps iron and manganese in ___
-limbo
-a negative charge
-a positive charge
-solution

A

solution

46
Q

aeration can be used to convert soluble ___ to insoluble.
-bacteria
-inorganics
-organics
- all of the above

A

inorganics

47
Q

GAC treatment can be used to remove ___
-VOC
-organic carbon
-taste and odor
-all of the above

A

all of the above

48
Q

Iron and manganese treatment is required due to ___
-secondary MCL in SDWA
-staining of porcelain fixtures
-cause of problems in the system
-all of the above

A

all of the above

49
Q

Fluoridation concentration greater than 1mg/L___
-is good for dental health of community
-above the MCL
-safer than chlorine disinfection
-causes mottled teeth

A

causes mottled teeth

50
Q

Chemicals used in fluoridationn are___
-sodium fluoride
-hydro fluoride acid
-fluorine
-all of the above

A

sodium fluoride

51
Q

The lead and copper rule require 90% of samples below ___ and ___ respectively
-1.3ug/L, 14mg/L
-15ug/L, 1.3mg/L
-13mg/l, 1,5ug/L
-1.3mg/L, 15 ug/L

A

15ug/L, 1.3mg/L

52
Q

Which of the membrane filters effectively removes TDS?
-reverse osmosis
-Nani-filtration
-ultra filtration
micro-filtration

A

reverse osmosis

53
Q

the permeate of a membrane filter is ____
-what has been rejected and removed from the water
-water that has passed through the membrane
-the filter material
-the filters container

A

water that has passed through the membrane

54
Q

Flux in membrane filtration refers to ____.
-the rate that water flows through the membrane.
-the pressure differential across the membrane
-the total flow rate through the filter
-the amount of pressure it takes to overcome osmotic pressure.

A

the rate that water flows through the membrane

55
Q

____ is an indication of membrane filter fouling.
-increase turbidity
-increasing chlorine demand
-increasing flux
-increasing filter pressure differential

A

increasing filter pressure differential

56
Q

Membrane filtration post treatment includes ___
-chlorination
-ion exchange
-green sand filtration
-all of the above

A

chlorination

57
Q

micro filtration can remove particles as small as___ or larger.
-0.0001 micrometers
-0.001 micrometers
-0.1 micrometers
-10 micrometers

A

0.1 micrometers

58
Q

SCADA is an acronym for ___ ___ ___ ___ ___.
-Supervisory control and data acquisition
-surveillance condition and data access
-system check and analog data analysis
-systematic collection of accessory data

A

Supervisory control and data acquisition

59
Q

The definition of a confined space is an area large enough to enter, _____ and _____.
-has a restricted means of exit, has the potential to contain a hazardous atmosphere
-is not intended for continuous occupancy, contains an engulfment hazard.
-has a restricted means of exit, is not intended for continuous occupancy.
-is not intended for continuous occupancy, has the potential to contain a hazardous atmosphere.

A

has a restricted means of exit, is not intended for continuous occupancy.

60
Q

The members of a confined space entry team are to perform an entry in a permitted space they must ___.
-don scuba gear
-contact rescue services.
-ensure there is adequate lighting and space to perform work.
-test the air for existing hazards.

A

test the air for existing hazards.

61
Q

Each year approximately which percentage of confined space deaths are would be rescuers.
-25%
-50%
-67%
-75%

A

67%

62
Q

What type of aquifer is least likely to be contaminated by surface run off.
-unconfined aquifer
-confined aquifer
-aquifer under direct surface influence
-aquifer over draft

A

confined aquifer

63
Q

An oxygen rich atmosphere is above___
-19.5%
-20.8%
-22.5%
-23.5%

A

23.5%

64
Q

Which gas smells like rotten eggs
-Carbo monoxide
-sulfur dioxide
-hydrogen sulfide
-nitrogen

A

hydrogen sulfide

65
Q

The information about safe handling and storage of chemicals can be found on the ___.
-chemicak information sheet
-internet
-employee right to know law
-safety data sheet

A

safety data sheet

Water Treatment (1 decks)

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