Water Treatment HW #1-8 Flashcards
Which is a part of the hydrologic cycle?
-accumulation
-perspiration
-condensation
-transdermal respiration
Condensation
turbidity is:
the alkalinity of the water
the hardness of the water
the corrosiveness of the water
the cloudiness of the water
the cloudiness of the water
Surface water tends to have increased
-contamination
-organic carbon
-turbidity
-all of the above
all of the above
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.
-Coagulation, flocculation, sedimentation, filtration, disinfection.
Traveling screens remove:
-alkalinity
-both a & c
-protozoa
-solids in the water
-solids in the water
Which are a common coagulant
-alum
-ferric sulfate
-copper sulfate
-both a & b
-both a & b
Filtration removes:
-pin point floc
-protozoa
-turbidity
-all of the above
-all of the above
common disinfectants include:
-ferric chloride
-chlorine
-alum
-all of the above
-chlorine
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
-destruction of all organisms
the finished water from a treatment plant is stored:
-in a reservoir
-in the clear well
-in a water well
-underground
-in a reservoir
-in the clear well
MCL is an acronym for ___
-Most common limit
-Maximum chemical level
-Maximum contaminate limit
-Minimal chemical listing
Maximum contaminate limit
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
15, 25, 60
Transient non community water system are required to sample for ___.
- synthetic organics
-nitrates and coliform
-disinfection by products
-aesthetics
nitrates and coliform
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
.08 mg/L on a running annual average
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
80 ug/L on a locational running annual average.
The primary goal of enhanced coagulation, is to ___.
-remove protozoa
-remove organic carbon
-remove turbidity
-remove pathogens
remove organic carbon
The MCL for total Chlorine is ___.
-.4 u/L
-4.0 u/L
-4.0 mg/L
-40 mg/L
4.0 mg/L
The objectives of the IESTWTR and LT1SWTR is to reduce ___
-chemical contamination
-pH
-harmful organisms
-organic carbon
harmful organisms
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
_< 0.3 ntu, 95
The IESWTR requires that the removal rate for virus’ is a ___ log, or ___%
-1, 90
-2, 99
-3, 99.9
-4, 99.99
4, 99.99
The total coliform rule sets the MCL at ___ samples per ___.
-5% of, week
-5% of, month
->5% of, month
->5% of, year
5% of, month
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
0.015 mg/L, 13 mg/L
The hydrologic cycle phases are ____.
-Precipitation, condensation, transcendentalism
-condensation, evaporation, precipitation
-evaporation, precipitation, condemnation
-participation, condensation, evaporation
Condensation, evaporation, precipitation
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 porous water bearing geologic formation
The wooer layer of a stratified lake is the ___?
-epilimion
-metalimnion
-hypolimion
-thermocline
epilimnion
What is the minimum depth the conductor casing in a sanitary seal?
-10 feet
-25 feet
-50 feet
-75 feet
50 feet
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
the difference between the static water level and the running water level
Sedimentation primarily uses ___ to remove floc after coagulation and flocculation
-alum
-baffles
-gravity
-weirs
gravity
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
0.5 gpm/ sf
Detention time in the sedimentation basin/ clarifier is nominally ___
-45 minutes
-1 hour 30 minutes
-3hours
-4 hours
4 hours
Excessive surface overflow rates can lead to ____
-long detention times
-lower filter run times
-less effective contact time
-increase filter efficiency
lower filter run times
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
0.5 feet per minute
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
20,000 gallons per day/foot
Plate and tube settlers can increase the surface overflow rate by increasing ___.
-coagulant dosage
-detention time
-density of floc
-surface area in basin
surface area in basin
A slow sand filter uses ___ of the filer volume, to filter out contaminates.
-top few inches
-half
-most
-all
top few inches
rapid sand filters require ___
-coagulation and flocculations
-sedientation
-disinfection
-contact time
coagulation and flocculations
filter ripening is dependent on ___ to adhere to the media
-absorption
-back washing
-adsorption
-sticky particles
adsorption
excessive head loss in the filter bed, can lead to ___
-increased filter run times
-reduction of mud balls
-increased filter efficiency
-air binding
air binding
Sudden flow changes are___ for filter operation.
-inconsequential
-detrimental
-beneficial
-required
detrimental
filter back-washing removes particle by ___
-forcing particles away
-chemically destroying particles
-oxidation of particles
-scrubbing sand grains against each other
scrubbing sand grains against each other
When back washing a filter the amount of water used should be ___ gal per sq ft
-25-75
-75-100
-100-150
-150-200
100-150
Filter efficiency should produce ___NTU ___% of the time
- _< 0.03, 95
- _< 0.03, 90
- _< 0.3, 95
- < 0.3, 90
_< 0.3, 95
When raising pH for precipitate softening. which of the following cannot be used?
-carbon dioxide
-caustic soda
-lie
-soda ash
carbon dioxide
Langelier index ___ tends to corrode.
-<0
-<1
->0
->1
<0
Equestrian keeps iron and manganese in ___
-limbo
-a negative charge
-a positive charge
-solution
solution
aeration can be used to convert soluble ___ to insoluble.
-bacteria
-inorganics
-organics
- all of the above
inorganics
GAC treatment can be used to remove ___
-VOC
-organic carbon
-taste and odor
-all of the above
all of the above
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
all of the above
Fluoridation concentration greater than 1mg/L___
-is good for dental health of community
-above the MCL
-safer than chlorine disinfection
-causes mottled teeth
causes mottled teeth
Chemicals used in fluoridationn are___
-sodium fluoride
-hydro fluoride acid
-fluorine
-all of the above
sodium fluoride
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
15ug/L, 1.3mg/L
Which of the membrane filters effectively removes TDS?
-reverse osmosis
-Nani-filtration
-ultra filtration
micro-filtration
reverse osmosis
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
water that has passed through the membrane
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.
the rate that water flows through the membrane
____ is an indication of membrane filter fouling.
-increase turbidity
-increasing chlorine demand
-increasing flux
-increasing filter pressure differential
increasing filter pressure differential
Membrane filtration post treatment includes ___
-chlorination
-ion exchange
-green sand filtration
-all of the above
chlorination
micro filtration can remove particles as small as___ or larger.
-0.0001 micrometers
-0.001 micrometers
-0.1 micrometers
-10 micrometers
0.1 micrometers
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
Supervisory control and data acquisition
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.
has a restricted means of exit, is not intended for continuous occupancy.
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.
test the air for existing hazards.
Each year approximately which percentage of confined space deaths are would be rescuers.
-25%
-50%
-67%
-75%
67%
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
confined aquifer
An oxygen rich atmosphere is above___
-19.5%
-20.8%
-22.5%
-23.5%
23.5%
Which gas smells like rotten eggs
-Carbo monoxide
-sulfur dioxide
-hydrogen sulfide
-nitrogen
hydrogen sulfide
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
safety data sheet
