WDTO 120 Final
WDTO 120 Final Exam Prep
Test your knowledge on water treatment processes and the hydrologic cycle with our comprehensive WDTO 120 Final quiz. Ideal for students and professionals in the water treatment field, this quiz covers a broad range of topics to help you prepare effectively.
Key Features:
- 75 diverse questions
- Multiple choice format
- Focus on essential water treatment concepts
The finished water from a treatment plant is stored...
Ungerground
In the clear well
In a water well
In a resvoir
Which is a part of hydrologic cycle?
Accumulation
Perspiration
Condensation
Transdermal Respiration
Turbidity is...
The alkalinity of the water
The hardness of the water
The corrosiveness of the water
The cloudiness of the water
Surface water tends to have increased...
Contamination
Organic carbon
Turbidity
All of the above
A conventional water treatment plant process order is...
Pretreatment, Treatment, Post Treatment
Screening Disinfection, Sedimentation, Filtration
Coagulation, Flocculation, Sedimentation, Filteration, Disinfection
Disinfection, Coagulation, Flocculation, Filtration
Traveling screens remove...
Alkalinity
Both Alkalinity and Protozoa
Protozoa
Solids in the water
Which is a common coagulants(s).
Alum
Ferric Sulfate
Copper Sulfate
Both Alum and Ferric Sulfate
Filtration removes...
Pin-point floc
Protozoa
Turbidity
All of the above
Common disinfectants includes...
Ferric Chloride
Chlorine
Alum
All of the above
Sterilization is defined as...
Selective destruction or inactivation of pathogens
A practice used to make water safe to drink
Destruction of all organisms
A practice used to sterilize drinking water
MCL is acronym for...
Most Common Limit
Maximum Chemical Level
Maximum Contaminate Level
Minimum Chemical Listing
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
Transient-non community water systems are required to sample for...
Synthetic Organics
Nitrates and Coliform
Disinfection by products
Aesthetics
Stage 1 Disinfection By-Product rule set the MCL for THM's at...
0.08 mg/L on a running annual average
0.08 µg/L on a locational running annual average
80 mg/L on a running annual average
80 µg/L on a locational running annual average
Stage 2 Disinfection By-Product rule changed compliance (sampling) points adding maximum residence time and set the MCL for THM's at ____
0.08 mg/L on a running annual average
0.08 µg/L on a locational running annual average
80 mg/L on a running annual average
80 µg/L on a locational running annual average
The primary goal of enhanced coagulation is to...
Removes protozoa
Removes organic carbon
Removes turbidity
Removes pathogens
The MCL for total chlorine is...
0.4 µ/L
4.0 µ/L
4.0 mg/L
40 mg/L
The objectives of the IESWTR and LT1SWTR is to reduce...
Chemical contaminations
PH
Harmful organisms
Organic carbon
The IESWTR requires that removal rate for virus's is a ____ log, or ____%.
1, 90
2, 99
3, 99.9
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
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, 1.3 mg/L
0.0015 mg/L, 1.3mg/L
The hydrologic cycle phases are ____.
Precipitation, condensation, transcendentalism
Condensation, evaporation, precipitaion
Evaporation, precipitation, condemnation
Participation, condensation, evaporation
An aquifer is...
The upper surface of a saturated zone
A porous water bearing geoolgic formation
Confined by an upper and a lower layer
Under the direct influence of a surface water
The upper layer of a stratified lake is the...
Epilimnion
Metalimnion
Hypolimnion
Thermocline
What is the minimum depth the conductor casing in a sanitary seal...
10 feet
25 feet
50 feet
75 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
Sedimentation primarily uses ____ to remove floc after coagulation and flocculation
Alum
Baffles
Gravity
Weirs
The maximum surface overflow rate is ____.
0.5 GPM/cf
0.5 GPH/sf
0.5 GPD/sf
0.5 GPM/sf
Detention time in the sedimentation basin / clarifier is normally...
45 min
1 hour and 30 min
3 hours
4 hours
Excessive surface overflow rates can lead to...
Long detention times
Lower filter run times
Less effectives contact time
Increase filter effeciency
Horizontal velocity through a sedimentation basin should not exceed...
0.5 feet per second
0.5 feet per minute
0.5 feet per second / cubic foot
0.5 feet per minute / cubic foot
The maximum flow through a weir should be no greater than...
20 GPM /foot
20 cubic feet / hour
20,000 gallon per day
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
A slow sand filter uses ____ of the filter volume, to filter out contaminates...
Top few inches
Half
Most
All
Rapid sand filters require ____.
Coagulation and flocculation
Sedimentation
Disinfection
Contact Time
Filter ripening is dependent on ____ to adhere to the media.
Absorpotion
Back Washing
Adsorption
Surface Wash
Excessive head loss in the filter bed, can lead to ____.
Increase filter run times
Reduction of mud balls
Increase filter effciencey
Air Binding
Sudden flow changes are ____ for filter operation.
Inconsequential
Detrimental
Beneficial
Required
Filter back-washing removes particles by ____.
Forcing particles away
Chemically destroying particles
Oxidation of particles
Scrubbing media and sand grains against each other
When back washing a filter, the amount of water used should be ____ gal per sqft.
25 - 75
75 - 100
100 - 150
150 - 200
Filter efficiency should produce ____ NTU ____% of the time.
‰¤ 0.03, 95
< 0.03, 90
≤ 0.3, 95
< 0.3, 90
When raising pH for precipitation softening. Which of the following cannot be used?
Carbon Dioxide
Caustic Soda
Lime
Soda Ash
Langlier index ____ tends to corrode.
< 0
< 1
> 0
> 1
Sequestration keeps iron and manganese in ____.
Limbo
A negative charge
A positive charge
Solution
Aeration can be used to convert soluble ____ to insoluble.
Bacteria
Inorganics
Organics
All of the above
GAC treatment can be used to remove ____.
VOC
Organic carbon
Taste and oder
All of the above
Iron and manganese treatment are required to due to ____.
Secondary MCL in SDWA
Staining of porcelain fixtures
Cause of problems in the systems
All of the above
Fluoridation is primarily done for ____.
Primary rquirement in SDWA
Disinfection
Corrosion control
The health of community
Fluoride concentration greater than 1 mg/L ____.
Is good for dental health of community
Above the MCL
Safer than chlorine disinfection
Causes mottled teeth
Chemicals used in fluoridation are ____.
Sodium fluoride
Hydro-fluoric acid
Fluorine
All of the above
The lead and copper rule require 90% of samples be below ____ and ____ respectively.
1.3 µg/L, 15 mg/L
15 µg/L, 1.3 mg/L
13 mg/L, 1.5 µg/L
1.3mg/L, 15 µg/L
Which of the membrane filters effectively removes TDS?
Reverse osmosis
Nano-filteration
Ultra-filteration
Micro-Filteration
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
Flux in membrane filteration 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 presure
____ is an indication of membrane filter fouling.
Increasing turbidity
Increasing chlorine demand
Increasing flux
Increasing filter pressure differential
Membrane filteration post treatment includes ____
Chlorination
Ion Exchange
Green sand filteration
All of the above
Micro filteration can remove particles as small as ____ or larger
0.0001 micrometers
0.001 micrometers
0.1 micrometers
10 micrometers
SCADA is an acronym for ____ ____ ____ ____.
Supervisory Control and Data Acquisition
Surveillance Condition and Data Analysis
System Check and Analog Data Analysis
Systematic Collection of Accessory Data
The definition of a confined space in 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
The members of a confined space entry team are to perform an entry in a permitted space they must ____.
Scuba Gear
Contact rescue services
Ensures there is adequate lighting and space to perform work
Test the air for existing hazards
Each year approximately which percentage of confined space deaths are would be rescuers.
25%
50%
67%
75%
What type of aquifer is least to be contaminated by surface run-off?
Unconfined aquifer
Confined aquifer
Aquifer under direct surface influence
Aquifer overdraft
An oxygen rich atmosphere is above ____.
19.5%
20.8%
22.5%
23.5%
Which gas smells like rotten eggs?
Carbon Monoxide
Sulfur Dioxide
Hydrogen Sulfide
Nitrogen
The handling about safe handling and storage of chemicals can be found on the ____
Chemical Information Sheet
Internet
Employee right to know law
Safety Data Sheet
The surface water treatment rule requires a ____ log removal rate for viruses...
2 log
3 log
4 log
5 log
A well pump base should be sealed to prevent the entry of...
Gases
Liquids
Solids
Liquids and Solids
Which statements is true of colloidal particles?
They are so small that gravity has little effect on them
The Zeta potential between particle is balanced
The exhibit bi-polar behavior
The surface area of the area particles are large when compared to the mass
How many zones does a sedimentation basin have?
3
4
5
6
Suspended particles have a ____ electrical charge.
Negative
Balanced
Positive
Poly Ionic
Slow sand filters runs can be long as long as...
6 days
6 weeks
6 months
1 year
Which step in conventional treatment process is eliminated in direct filteration?
Oxidation
Coagulation
Flocculation
Sedimentation
Which of these chemicals are used to change soluble hardness to insoluble hardness to insoluble harness?
Lime
Caustic Soda
Soda Ash
All of the above
Black stains on porcelain fixtures is caused by soluble ____.
Lead
Iron
Magananese
Magnesium
Coagulant aids are used ____.
During time of low temperature
To reduce the primary coagulants requirement
To increase alkalinity
All of the above
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