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Water Treatment OIT Test Questions
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Water Treatment OIT Test Questions
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Water Treatment OIT Test QuestionsWhat is the object of O. Reg. 169/03? - ANSWER Drinking Water Standards: sets
out minimum standards : 3 schedules
What is the object of O. Reg. 170/03? - ANSWER Drinking Water Systems
Regulations:
Sampling, Testing, Reporting Adverse Tests, Min level of treatment for GW and SW.
What is the object of O. Reg. 248/03? - ANSWER Testing Regulation:
Regulates; Sampling, Testing, Analysis, handling, creates a licensing system for
labs.
What is the object of O. Reg. 128/04 and O. Reg. 129/04? - ANSWER Controls
Licensing
What major regulations are contained under the Ontario Water Resources Act
(OWRA)? - ANSWER Reg 285, 129, 903
What is the object of O. Reg. 285/99? - ANSWER Permits for water taking and
transfer
What is the object of O. Reg. 903? - ANSWER Wells
Physical Characteristics - ANSWER Temperature, Colour, Suspended Solids,
Turbidity
Chemical Characteristics - ANSWER Nutrients, minerals, metals, oxygen, organic
compounds
Biological Characteristics - ANSWER Aquatic plants, animals, algae, bacteria,
protozoa
What is the minimum level of treatment for surface water? - ANSWER Chemical
assisted filtration, Primary disinfection
What is the minimum level for treatment for GUDI water? - ANSWER Same as
surface:
Chemical assisted filtration, disinfection
Why is surface water quality so variable? - ANSWER No single or simple measure of
quality
Contain a wide variety of substances
Why are lakes and reservoirs usually sources of better quality water than rivers? -
ANSWER Suspended matter settles at the bottom and natural purification processes
have time to improve water.
, What is thermal stratification - ANSWER Changes in temperature profile with depth
in a lake
What is eutrophication? - ANSWER High nutrient loading in lakes and rivers. Can
come from nitrogen and phosphorus due to wastewater discharges.
What is presedimentation? - ANSWER Removes gravel, sand, silt prior to main
treatment
What is coagulation? - ANSWER Rapid dispersion of coagulant in water to
destabilize particles and form precipitates
What is flocculation? - ANSWER The gentle agitation of water to promote contact
between particles to form larger floc
What is a coagulant aid? - ANSWER Coagulant used to promote larger and/or
tougher floc
What is a polymer? - ANSWER A coagulant aid
What are some factors affecting coagulation and flocculation? - ANSWER Raw water
quality
Turbidity
Color
Alkalinity
What are some ways in which mixing is achieved in coagulation and flocculation? -
ANSWER In line
Cross Section
Vertical
Hydraulic
Turbine
Walking Beam
What is clarification, and why is it performed? - ANSWER The removal of
solids(mainly floc), mainly by gravity settling
To reduce particulate load on filters and extend filter run times
What is direct filtration? - ANSWER addition of coagulant chemicals, flash mixing,
coagulation, minimal flocculation, and filtration
What factors affect particle settling? - ANSWER Temperature
Coagulation/Floc performance
Sedimentation Tank - ANSWER Circular
High Rate Settlers - ANSWER Rakes/Tubes
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