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2024 ONTARIO OIT STUDY MANUAL TEST EXAM WITH CORRECT ANSWERS
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2024 ONTARIO OIT STUDY MANUAL TEST EXAM WITH CORRECT ANSWERS
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2024 ONTARIO OIT STUDYMANUAL TEST EXAM WITH
CORRECT ANSWERS
Which of the following are safety hazards with treatment plants or
distribution/collection systems? - CORRECT-ANSWERSWorking with electrical
and mechanical Equipment
Handling/storage of treatment chemicals inc chlorine
working in confined spaces
exposure of pathogens
What is meant by the term "combined sewers"? - CORRECT-
ANSWERSstormwater and sewage are collected in the same sewers.
Why is hydrogen sulphide gas a problem in sewers? - CORRECT-
ANSWERSleads to corrosion of certain types of sewers
Whats the purpose of OHSA? - CORRECT-ANSWERSOccupational Health and
safety Act (OHSA) its regulations govern safety in the workplace. these
regulations place demands on you, your supervisor and your employer. To
violate these regulations can lead to heavy fines and or imprisonment. The
act also gives workers the right to refuse to do work if he/she has reasonable
grounds that the work is dangerous. Workers are ultimately responsible for
their own safety.
Why is a minimum wastewater velocity of 0.6 m (2.0 feet) per second
necessary in a gravity sewer? - CORRECT-ANSWERSit will prevent the build
up of solids in the sewer
What is a source of excessively clear water in a collection system? -
CORRECT-ANSWERSinfiltration from a high water table
When operating a pump, an operator feels a vibration and hears a slight
hammering noise? - CORRECT-ANSWERScavitation
2 reasons why suspended particle should be removed during the water
treatment process? - CORRECT-ANSWERSTo remove harmful; particles as
well as to ensure that pathogens are not shielded by particulate during
disinfection.
, How Filtration work? - CORRECT-ANSWERSTiny pore spaces in the filter
media trap the particles in the water. Filters typically contain layers of
anthracite or granular activated carbon, sand and gravel.
What is jar test? - CORRECT-ANSWERSUsed to determine the optimal
chemical doses by simulating the conditions in the plant at a small scale. Jar
tests are typically used for coagulation- flocculation processes.
What is the purpose and method of backwashing? - CORRECT-
ANSWERSBackwashing is used to clean the filters. During this process, the
normal water flow is shut off and treated water is pumping up, backwards,
through the filter media to remove the entrapped matter.
What is aeration? - CORRECT-ANSWERSProcess of mixing sir and water
together. It is used for stripping or removing volatile organic compounds or
undesirable gases from water.
What common methods used for treatment of iron and manganese? -
CORRECT-ANSWERSSequestering keeping the iron and manganese in
solution or removal by oxidation and filtration.
which is parameter is very important to public health and must be test
regularly by the operator? - CORRECT-ANSWERSChlorine residual ( from
secondary disinfection)
Secondary disinfection is achieved by? - CORRECT-ANSWERSChlorination or
chloramination
What Contaminants are removed from sewage in waste water treatment? -
CORRECT-ANSWERSSolids, BOD, nutrients like nitrogen and phosphorus
which promotes algae growth, pathogenic microorganisms and harmful
chemicals.
What are two key variables that are being manipulated in wastewater
treatment process? - CORRECT-ANSWERSOxygen and bacteria
describe the objective of sludge treatment before final disposal and list two
main methods? - CORRECT-ANSWERSstabilize the sludge so that there is a
low oxygen demand. Most common sludge treatment are aerobic and
anaerobic digestion.
How aerobic digestion of sludge differs from anaerobic digestion? -
CORRECT-ANSWERSanaerobic digester break down the solids on the sludge
to methane gas, carbon dioxide and inert solids. In aerobic digesters
Microorganism also break down the sludge. Eventually as food runs out the
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