WorksheetsTEST YOURSELF
Total questions: 45
Worksheet time: 45mins
Both temporary and permanent hardness of water can be removed by
boiling
distillation
filtration
decantation
Coliform bacteria in water is an indication of the presence of
radioactive wastes
excess fertilizer
decaying animals and plants
human feces
The activated sludge process is sometime referred as
fluid bed biological oxidation system
fixed bed biological oxidation system
turning bed biological oxidation system
none of the above
BOD stands for
biochemical oxygen demand
british oxygen demand
british oxygen depletion
biological oxygen depletion
When temporary hard water is boiled, one of the substances formed is
calcium bicarbonate
calcium sulfate
hydrogen chloride
carbon dioxide
The methods used for biological treatment are
lagoon
activated sludge process
oxidation ditches
all of these
The purest form of naturally occurring water is
Rain water
River water
Pond water
Well water
The activated sludge process consists of returning a portion of the clarifier
effluent water entering the reactor
influent water coming out of the reactor
influent water entering the reactor
effluent water coming out of the reactor
Lagoons may be characterized as
anaerobic
facultative
aerated
all of these
Which of the following substances are commonly used in a filter?
Charcoal
Sand
Both (1) and (2)
Aluminum chloride
Biological oxidation processes usually referred as biological treatment, are the most common form of
primary treatment
secondary treatment
tertiary treatment
all of these
Sedimentation is a physical process used in wastewater treatment to
remove particles that are less dense than water
remove particles that are more dense than water
remove the pertinacious material from the water
none of the above
The ultimate source of water is
rivers and lakes
dew and forest
rain and snow
underground and surface
Which of the following physical method is used as germicidal in modern time for the treatment of drinking water?
Chlorination
Treating with potassium permagnate
UV radiation
Treating with bleaching powder
The common methods used for disinfection in waste water treatment plants are
chlorination
UV light
both (1) and (2)
Phenolic solvent
Which of the following chemical is sometime added in the process of coagulation and flocculation?
Aluminum sulphate
Aluminum oxide’
Calcium chloride
None of these
Secondary treatment uses __________ to consume wastes
micro-organisms
chemicals
filtration
none of these
Conventional tertiary treatment is
chemical coagulation and flocculation
filtration
sedimentation
none of these
The chemical oxygen demand (COD)measures the
amount of oxygen required for growth of microorganisms in water
amount of oxygen required to oxidize the organic matter in waste water
amount of oxygen required to oxidize the calcium present in waste water
none of the above
The single most important consideration about any drinking water supply is its freedom from:
Iron staining
Disease-producing organisms
Total dissolved solids
Chlorides
Following are types of microorganisms that can be pathogenic (disease producing) in drinking water:
Bacteria
Protozoa
Viruses
All of the above
Coliform bacteria:
Grow in the intestines of people and warm blooded animals
Usually cause diseases
Respond to water treatment differently than do most other pathogens
Exist only in water that contains pathogens
Turbidity or water clarity testing can provide information about the bacteriological safety of water.
True
False
What causes sediment from construction sites to get in rivers and streams?
nitrates
high pH
eutrophiciation
weathering and erosion
Measure of the amount of suspended solids is
salinity
turbidity
humidity
coverly
What does a measurement of dissolved oxygen read?
temperature
pH
salinity
amount of oxygen in water
Excessive nutrients cause
lower temperature
higher temperature
high dissolved oxygen
low dissolved oxygen
Screening and comminution are preliminary treatment processes.
True
False
_____ devices remove materials which would damage equipment or interfere with a process.
Grit
Screening
Oxidation
Reduction
__________ represents the heavier inert matter in wastewater.
Debris
Waste
Grit
Screens
Supplemental means of aeration are often employed with an equalization basin to provide better mixing.
True
False
Which of the following should be provided in the case where aeration is absent?
Screening devices
Mechanical mixers
Grit removers
Sedimentation tank
Which process is employed to gain sufficient head for the wastewater?
Screening
Pumping
Oxidation
Fermentation
What is the most common used coagulant?
Alum
Ferric sulphate
Limestone
Coal
What is the intermediate zone composed of in aerobic-anaerobic ponds?
Algae
Aerobic bacteria
Facultative bacteria
Organic solids
__________ is a process which involves further removal of the nitrogen.
Nitrification
Denitrification
Ammonification
Reduction
What is the method of treatment used when the TSS in the sample is high?
Ultrafiltration
High rate solid contact clarifier
Pressure Sand filter
Activated Carbon filter
Which type of treatment does clarification fall in?
Secondary treatment
Primary treatment
Preliminary treatment
Tertiary treatment
Which of these remove coarse materials?
Coarse screen
Grit chamber
Fine screen
Commutors
Which type of treatment is the coarse screen?
Preliminary treatment
Primary treatment
Secondary treatment
Tertiary treatment
Tube settlers are classified as which type of treatment?
Tertiary treatment
Secondary treatment
Preliminary treatment
Primary treatment
Activated Carbon is classified as which type of treatment?
Preliminary treatment
Primary treatment
Secondary treatment
Tertiary treatment
Which of these is used to remove odour?
Ultrafiltration
Pressure sand filter
Activated carbon
Nano filter
Reverse Osmosis is which type of treatment?
Primary treatment
Preliminary treatment
Secondary treatment
Tertiary treatment
Which is usually prior to reverse osmosis?
Ultrafiltration
Activated carbon filter
Clarifier
Tube settler
