WorksheetsSecondary treatment
Total questions: 56
Worksheet time: 38mins
What is the first step in the water treatment process?
coagulation
filtration and removal of debris, sand, grit, etc.
flocs
concentation
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.
Which substance is used in a sewage treatment system to kill harmful bacteria?
ammonia
chlorine
sand
soap
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
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
The material that is removed from the wastewater, sent through the belt press and requires proper treatment and disposal methods is called
sediment
sludge
mixed liquor
aeration
What is no longer added to the water treatment process?
sludge
aeration
fluoride
sodium
Water flows through a filter designed to remove the particles form.
Agitation
Coagulation
Filtration
Flocculation
Things we can do to save clean water, except:
Taking shorter showers
Make sure to pick up your trash
Make sure to turn off the running tap when not in use
Pour dangerous chemical solutions to the sink
These are steps of wastewater treatment, except:
Flocculation
Saponification
Coagulation
Sedimentation
What disease is cause by water pollution? Except ...
Cholera
Influenza
Tuberculosis
Chickenpox
How does the development of urban area affect the river?
No effect at all
Water remains stable
Pollutes the water
Water tastes funny
What is Sludge?
The wastewater and other different types of waste.
A network of pipes that carry sewage.
A dense material that sinks to the bottom of the septic tank.
A material that floats at the top of a septic tank.
What is Sewage?
Wastewater and other different types of waste.
A network of pipes that carry sewage.
A dense material that sinks to the bottom of the septic tank.
A material that floats at the top of a septic tank.
What is Scum?
Wastewater and other different types of waste.
A network of pipes that carry sewage.
A dense material that sinks to the bottom of the septic tank.
A material that floats at the top of a septic tank.
What is a Sanitary Sewer?
Wastewater and other different types of waste.
A network of pipes that carry sewage.
A dense material that sinks to the bottom of the septic tank.
A material that floats at the top of a septic tank.
What is a Septic Tank?
A place where wastewater flows through screens to catch large particles.
An underground tank that contains bacteria that treats wastewater.
A place in which the wastewater is filtered through a bed of gravel that is covered with colonies of bacteria.
The process of settling down of particles of a solid in a liquid is
Sublimation
Sedimentation
Filtration
Decantation
The solubility ____________ with increase in temperature.
doesn't change
decreases
increases
Sawdust is not soluble in water. If, accidentally some particles of sawdust drop into a glass of water. How would you separate them from water?
Decanting
Filtering
Sieving
Distillation
What is a sewage treatment plant?
The place where water is cleaned, filtered and tested before re-entering the water cycle.
The place where water is cleaned, filtered and tested before going to our houses.
The network of pipes that carry sewage (dirty water) from our houses.
The place where water is bottled for drinking.
Advantages of Sewage System
The domestic sewage treatment plant needs to be running
steadily to be effective.
The sewerage system provides a healthier and more appropriate way to manage liquid wastes.
The sewerage system provides a healthier and more appropriate way to manage solid wastes.
Disadvantages of Sewage System
The domestic sewage treatment plant needs to be running
rarely to be effective.
It must be permanently supplied with electricity to
operate.
Waste Will Be Discharged
Sewage is mainly
Liquid Waste
Solid Waste
Gaseous waste
Mixture of solid and gaseous waste
Treatment of sewage can be done by ___________, ___________, and _____________ types of processes.
Physical
Chemical
Biological
Mechanical
What are the three types of primary treatment?
aeration
Screening
Grit and sand removal
Primary sedimentation
Attached film differs from the suspended system because
presence of media
type of microbes
length of treatment
type of treatment
Decomposition caused by anaerobic bacteria is sometimes called as _____, is accompanied by bad odor
Putrefaction
Decomposition
Oxidation
Sedimentation
A sewage that turns dark and smell unpleasantly due to anaerobic decomposition is called _____
Black water
Grey water
Yellow water
Septic
Bacteria which still functions even with or without free oxygen
Aerobic
Anaerobic
Facultative
Septic
Develop a sustained BOD peak mass loading curve for a treatment plant with a design flowrate of 1 m3/s. Assume daily BOD concentration is 200 g/m3. What is the mass loading value for BOD, kg/d?
5000
200
2000
17280
Advantages of having anaerobic treatment over aerobic treatment process
energy input of the system is low as no energy is required for oxygenation
lower nutrient requirement
lower production of excess sludge
higher biological synthesis
Biochemical process in the anaerobic treatment
hydrolysis
fermentation
acetogen
methane
Physical design similar to AEBR only uses higher liquid velocity
FBR
UASB
EBR
RBC
This treatment can be applied both in aerobic and anaerobic condition
RBC
Trickling filter
BAF
UASB
