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WorksheetsTest 1
Total questions: 84
Worksheet time: 1hrs 12mins
Which method introduces microorganisms to break down hazardous organic compounds?
Sanitary landfill
Incineration
Discharge to sewers, streams, and rivers
Chemical treatment
Biological treatment
In which part of the wastewater treatment process are bacteria introduced to the wastewater to feed on organic particles, such as food and feces? (Select 2 choices)
sedimentation
aeration
disinfection
primary treatment
secondary treatment
In the wastewater treatment process, what is the role of bacteria for water purification?
digesting organic matter
adding chlorine
nothing, we don't want them in there
add nutrients to the sludge
In sewage treatment, the purpose of bubbling oxygen into the aeration tank is to
react chemically with nitrates and phosphates.
keep the fish alive.
keep decomposing bacteria alive.
improve the odor.
What is the general term for any disease-causing organism?
megafauna
microcosm
pathobacillus
pathogen
What happens in the digesters?
aerobic bacteria processes organic waste
organic waste is turned into usable fertilizer
anaerobic bacteria processes organic waste
chlorine is added to disinfect biosolids
What is produced in the digesters?
methane gas
chlorine
fertilizer
effluent
Which step is Secondary Treatment?
Digesters
Aeration basins
primary clarifiers
Disinfection
Why is the sludge aerated in the aeration tank?
To avoid bacterial growth
To increase bacterial growth
To maintain pH
To maintain temperature
Which is the next treatment unit after activated sludge reactor in the treatment process?
Flocculation unit
Aeration unit
Secondary clarifier
Disinfection unit
Which of these is not an alternative to activated sludge treatment systems?
Stabilization ponds
Rotating biological contactors
Trickling filter
Screening units
Which are the three ingredients in activated sludge systems?
Cells, sewage and oxygen
Cells, sewage and nitrogen
Solids, sewage and oxygen
Solids, water and oxygen
What water types were analyzed in the combined TiO2 photocatalysis and RBC process?
wastewater
pharmaceutical wastewater
domestic water
industrial water
Which is not part of the parameters of the RBC process
hydraulic load
speed of rotation
residual water
Measurement of COD and BOD
what is the meaning of RBC?
relative biological contactor
reactor biological contactor
rotative biological contactor
radioactive biological contactor
which are the advantages of RBC PROCESS?
low cost, bigger spaces, easy maintenance.
easy maintenance, operation in energy, bigger spaces
smaller spaces, operation in energy, easy maintenance
low cost, low efficiency, smaller spaces
Which of the following treatment systems are not categorized under attached growth processes?
Rotating Biological Contactor (RBC)
Trickling Filter (TF)
Raceway Pond (RP)
Integrated fixed film activated sludge (IFAS)
These are the physical parameters of water quality except
turbidity
salinity
temperature
BOD (biochemical oxygen demand)
These are the parameters used to calculate WQI (Water Quality Index) except...
BOD
DO
Phosphorus
Ammoniacal nitrogen
Total Suspended solid
Runoff of sewage and agricultural wastes into coastal waters introduce
algae growth
rainwater
surface runoff
oil spill
What is the first step in the water treatment process?
coagulation
filtration and removal of debris, sand, grit, etc.
flocs
concentation
Preliminary treatment
prevents toxic chemicals.
removes large objects.
is unnecessary.
is useless.
What is the first step of preliminary wastewater treatment, which removes large items such as plastic wrappers and sticks?
screening - employs the use of a "bar screen"
sedimentation
aeration
disinfection
List the following steps of Water purification in the correct order
Step P: Water is passed through a screen to remove debris.
Step Q: Pathogenic organisms are killed by chlorination, UV, or ozone.
Step R: Suspended particles clump and settle out.
Step S: A flocking agent, such as alum, is added to the water.
P, Q, R, S
S, P, R, Q
P, S, R, Q
R, P, S, Q
S, R, P, Q
What is the first step of preliminary wastewater treatment, which removes large items such as trash, plastic wrappers rags, and sticks?
bar screens
sedimentation
aeration
disinfection
The principle or main advantage of using constructed wetlands for wastewater treatment is:
the resulting water exceeds all drinking water standards
a natural ecosystem replaces industrial methods for advanced treatment and it is less expensive to build and maintain.
it removes dioxin and other pollutants in the sediment of the wetland
the method eliminates the production of methane, which contributes to global warming
The semi-solid organic material that comes out of a wastewater treatment plant after completion of the wastewater treatment process is called
wastewater.
pathogenic.
sewage.
sludge.
What is a container, typically underground, in which sewage is collected and allowed to decompose through bacterial activity before draining by means of a leaching field called? (Many rural yards have these.....)
treated sewage chamber
septic tanks
fecal reservoir
dirty water vessel
Where does the "cleaned" water from the wastewater treatment plant go?
Back to homes to be reused
To the drinking water facility
Released into the nearest river or water body
Soaks back into the ground
What happens during primary treatment of wastewater?
Water enters a tank and it stays in the tank for a few hours so solid particles can settle to the bottom
Water passes through a bar screen to remove sticks rocks and garbage. Then the water is slowed down when it enters the grit tank so that sand, gravel, and heavy metals settle to the bottom.
The process of removing debris from tanks to be trucked to a landfill.
When chlorine is added to water to kill the living organisms the it’s released into a lake or river
What is a sewage system?
system that cleans dirty water
pipes that transport dirty water
system that transports blackwater
pipes that transports floc/soil
What is effluent?
the suspended solids in the water
the partially treated wastewater moving through the facility
the solids that come out of the digesters
water-borne diseases
What type of system carries both sewage and storm water runoff?
septic tanks
alternative wastewater
combined sewers
digesters
What percentage of organic matter is removed by primary and secondary treatment at the wastewater facility?
50%
75%
85%
99%
What happens in the primary clarifiers at the wastewater treatment facility?
oil and grease are skimmed off the top
sludge settles out to the bottom
effluent is piped on to the aeration basins
all of these
What are biosolids?
sludge
solid waste
organic matter
all of these
Why are constructed wetlands NOT used as much as wastewater treatment plants?
Require large amounts of land
Less expensive to build
Less expensive to maintain
Provide homes for wildlife
Which one is the characteristic of wastewater?
Does not contain pathogenic micro-organisms
Safe to health
Used water from residential, commercial, and industrial areas
Free from breeding sites for insects, pests and micro organism
Which of the following wastewater flowrates is important in the design facilities involving retention time?
Minimum hourly flow
Peak hourly flow
Average daily flow
Maximum daily flow
Which of the following sources is NOT categorized as domestic wastewater?
Manufacturing factories
Residential houses
Schools
Toilet and bathroom
Which of the following is NOT considered as physical characteristic of wastewater?
Temperature
Organic compound
Odor
Solids
Which ONE of the following is property of organic compound?
Non combustible
Low molecular weight
High melting and boiling points
Less soluble in water
What is the effect of excessive organic compounds in water?
Maintain the population of aquatic life
Increase the level of dissolved oxygen (DO)
Damage the ecosystem
Not a cause to health hazard
'Easily degraded by microorganisms' is a characteristic of?
Non-biodegradable organics
Biodegradable organics
Inorganic compunds
Which of the following is NOT including in the measurement of organic compounds in water?
Chemical oxygen demand
Biochemical oxygen demand
Biological oxygen demand
pH
Definition of BOD
Quantity of chemical utilized by micro-organisms to biologically degrade the organic matter in the water under anaerobic condition
Quantity of oxygen utilized by micro-organisms to biologically degrade the organic matter in the water under aerobic condition
Definition of COD
The quantity of equivalent oxygen needed to chemically oxidize the organic compound in sample, converted to carbon dioxide and water.
The quantity of equivalent chemical needed to biologically oxidize the organic compound in sample, converted to nitrogen and water.
Which one is the TYPICAL condition for COD and BOD in water?
COD/BOD5 ≈ 2 to 3
COD > BOD
COD >> BOD5
Which are from the following inorganic compounds are NOT coming from natural sources?
Alkalinity
Nitrogen and Phosphorus
Chlorides
Sulphur
Which are the wastewater quality standards used in Malaysia?
Regulations in Environmental Quality (Sewage), 2009
Environmental Quality Act, 1974
Standards for sewage treatment plant effluent (Standard A and Standard B
All the above answers.
Preliminary treatment
prevents toxic chemicals.
removes large objects to prevent damage to equipment.
is unnecessary.
is useless.
What gas must be maintained at precise levels in the aeration tank to maintain aerobic processes?
CO2
O2
H2
CO
What causes foam in the water of the aeration process?
pollution
excess bacteria
trapped air
too much chemical treatment
Which of the following is not part of the primary treatment?
Grit Chamber
Screens
Aeration tank
Which of the following items is an organic item and will eventually become sludge?
Plastic cup
Car charger
Banana Peel
Syringe
Sewage pipes are a critical part of a city's infrastructure.
True
False
What is a sewer system?
A system at home that cleans water.
A pipe network that transports dirty water.
A system that cleans dirty water used by an urban area.
Pipes that transport only greywater
What is the difference between black water and grey water?
Black water is water that is contaminated by nature, but grey water is water contaminated by man.
Black water is black colored water and grey water is grey colored water.
Black water is water that is from cooking and laundry, grey water is water that contains feces
Black water is contaminated by urine and feces but grey water is from cooking or laundry and others.
If every house installed a septic system what would be the main problem?
It would be too loud
It would take up too much space
Kids can fall in
It can cause air pollution
What is the preliminary treatment
Water enters a tank and it stays in the tank for a few hours so solid particles can settle to the bottom
Water passes through a bar screen to remove sticks rocks and garbage. Then the water is slowed down when it enters the grit tank so that sand, gravel, and heavy metals settle to the bottom.
The process of removing debris from tanks to be trucked to a landfill.
When chlorine is added to water to kill the living organisms the it’s released into a lake or river
where does stormwater runoff come from? Select the most correct answe
precipitation in country roads, marshes, lawns
water in houses, apartments, buildings
precipitation in roads, roofs, lawns
precipitation in roads, farms, bathrooms
Casandra said gray water and black water are the same because they are both wastewater. Why is she incorrect?
because they aren’t wastewater
because gray water is feces and urine and black water is used by humans
because one is contaminated by humans and the other is not
because grey water is used by humans and blackwater is feces and urine
why is gray and black water different from stormwater runoff?
because gray and black water is chemical and stormwater runoff is natural
because they are contaminated by humans and stormwater runoff is not
because they are wastewater and stormwater is from human waste
because stormwater runoff is from precipitation and gray and black water are by human activity
What is the first step of the septic system?
intake, water is taken from its source and uses a grid to get rid of big debris
desalination, where you evaporate the contaminated water and take the steam/gas and use it for fresh water.
where contaminated water is put through a bar screen, which removes large objects such as sticks, rocks, and garbage.
water is drained from pipes and settled into a septic tank and where solids sink to the bottom and scum, grease and oil floats to the top.
What is something negative about treating both stormwater runoff and wastewater? There are two correct answers.
stormwater can pick up pollutants and carry them straight into surface water.
greater resources are used to treat the water
more wastewater treatment plants need to be built
only one drainage system needs to be built
What is the difference between a septic system and a sewage system?
They’re the same, but the septic system is smaller
The sewage system treats water and the septic system doesn’t
The septic system treats water but the sewage system doesn’t
The sewage system is underground and the septic system is above ground.
If Annie lived on a farm, why would it be better if she used a septic system instead of a sewage system?
She doesn’t, she uses the sewage system
Because she likes it better
Because she’s too far away from a water treatment plant
Because it’s more environmentally friendly
The combined wastewater from a community consists of domestic wastewater from a serviced population of 9,800 persons; sugar refining waste of 135,000 gpd with a BOD concentration of 1,600 mg/L and a poultry processing waste of 55,000 gpd containing 750lb of BOD. Estimate the combined wastewater flow in gpd.
(a)
If the suspended solids (TSS) in a wastewater sample at the treatment plant influent is 100 mg/L, and the flow rate of the wastewater is 100 MGD, calculate the mass flow rate entering the plant.
(a)
If the depletion of oxygen is found to be 2.5 mg/L after incubating 2.5 ml of wastewater diluted to 250 ml for 5 days at 20 Celsius, calculate the BOD in mg/L for the wastewater.
(a)
What is the percentage removal of a WWTP when the influent BOD is 245 mg/l and the effluent BOD is 22 mg/l?
(a)
