Water Treatment HW #1-8

Question 1

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

Answer 1

Condensation

Question 2

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

Answer 2

the cloudiness of the water

Question 3

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

Answer 3

all of the above

Question 4

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.

Answer 4

-Coagulation, flocculation, sedimentation, filtration, disinfection.

Question 5

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

Answer 5

-solids in the water

Question 6

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

Answer 6

-both a & b

Question 7

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

Answer 7

-all of the above

Question 8

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

Answer 8

-chlorine

Question 9

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

Answer 9

-destruction of all organisms

Question 10

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

Answer 10

-in a reservoir
-in the clear well

Question 11

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

Answer 11

Maximum contaminate limit

Question 12

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

Answer 12

15, 25, 60

Question 13

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

Answer 13

nitrates and coliform

Question 14

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

Answer 14

.08 mg/L on a running annual average

Question 15

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

Answer 15

80 ug/L on a locational running annual average.

Question 16

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

Answer 16

remove organic carbon

Question 17

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

Answer 17

4.0 mg/L

Question 18

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

Answer 18

harmful organisms

Question 19

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

Answer 19

_< 0.3 ntu, 95

Question 20

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

Answer 20

4, 99.99

Question 21

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

Answer 21

5% of, month

Question 22

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

Answer 22

0.015 mg/L, 13 mg/L

Question 23

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

Answer 23

Condensation, evaporation, precipitation

Question 24

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

Answer 24

a porous water bearing geologic formation

Question 25

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

Answer 25

epilimnion

Question 26

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

Answer 26

50 feet

Question 27

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

Answer 27

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

Question 28

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

Answer 28

gravity

Question 29

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

Answer 29

0.5 gpm/ sf

Question 30

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

Answer 30

4 hours

Question 31

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

Answer 31

lower filter run times

Question 32

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

Answer 32

0.5 feet per minute

Question 33

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

Answer 33

20,000 gallons per day/foot

Question 34

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

Answer 34

surface area in basin

Question 35

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

Answer 35

top few inches

Question 36

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

Answer 36

coagulation and flocculations

Question 37

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

Answer 37

adsorption

Question 38

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

Answer 38

air binding

Question 39

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

Answer 39

detrimental

Question 40

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

Answer 40

scrubbing sand grains against each other

Question 41

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

Answer 41

100-150

Question 42

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

Answer 42

_< 0.3, 95

Question 43

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

Answer 43

carbon dioxide

Question 44

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

Answer 44

<0

Question 45

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

Answer 45

solution

Question 46

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

Answer 46

inorganics

Question 47

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

Answer 47

all of the above

Question 48

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

Answer 48

all of the above

Question 49

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

Answer 49

causes mottled teeth

Question 50

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

Answer 50

sodium fluoride

Question 51

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

Answer 51

15ug/L, 1.3mg/L

Question 52

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

Answer 52

reverse osmosis

Question 53

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

Answer 53

water that has passed through the membrane

Question 54

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.

Answer 54

the rate that water flows through the membrane

Question 55

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

Answer 55

increasing filter pressure differential

Question 56

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

Answer 56

chlorination

Question 57

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

Answer 57

0.1 micrometers

Question 58

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

Answer 58

Supervisory control and data acquisition

Question 59

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.

Answer 59

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

Question 60

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.

Answer 60

test the air for existing hazards.

Question 61

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

Answer 61

67%

Question 62

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

Answer 62

confined aquifer

Question 63

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

Answer 63

23.5%

Question 64

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

Answer 64

hydrogen sulfide

Question 65

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

Answer 65

safety data sheet