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2024 OIT MANUAL EXAM WITH CORRECT ANSWERS
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2024 OIT MANUAL EXAM WITH CORRECT ANSWERS
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2024 OIT MANUAL EXAM WITHCORRECT ANSWERS
Name the Ontario regulation for operational checks and sampling
requirements - CORRECT-ANSWERSO. Reg. 170/03 Drinking water systems
regulation
pH - CORRECT-ANSWERSadjustment of this parameter can often optimize the
coagulation process
flocculation - CORRECT-ANSWERSto achieve particles that will readily settle
out of water, involves slow mixing of water in order to build particle size and
density
Prechlorination - CORRECT-ANSWERSwater dosed with chlorine to remove
potential odours, kill algae or control zebra mussels
Alum - CORRECT-ANSWERSFerrous sulphate, ferric sulphate and polymers
can be used for the same purpose, Alum is a commonly used coagulant
chemical
Backwashing - CORRECT-ANSWERSused to clean filters
Coagulant - CORRECT-ANSWERStoo much or too little will decrease the
efficiency of the treatment process
What contaminants are removed from sewage in wastewater treatment -
CORRECT-ANSWERSsolids, BOD, nutrients such as nitrogen (N) and
phosphorous (P) which promote algae growth, pathogenic microorganisms
and harmful chemicals
Preliminary treatment of wastewater - CORRECT-ANSWERSto ensure large
objects or grit do not damage piping or equipment in treatment facility.
Coarse screens, chopping or shredding (comminution), grit channels or
chambers remove sand, eggshells, stones
Primary treatment of wastewater - CORRECT-ANSWERSto remove large
settleable and floatable materials using primary settling basins (primary
clarifier) where flow velocity is slowed so that solids settle or float
, Secondary Treatment of wastewater - CORRECT-ANSWERSto remove
dissolved or unsettleable impurities (BOD, suspended solids), in Ontario
activated sludge process, sequencing Batch Reactor (SBR), Tricking Filters,
Rotating Biological Contactors (RBC), Moving Bed biological Reactor (MBBR),
and aerated lagoons.
Tertiary Treatment of wastewater - CORRECT-ANSWERSmost involve
physical/chemical processes including chemical precipitation, reverse
osmosis, carbon adsorption, filtration and membrane filtration
2 key variables that are being manipulated in waste water treatment
processes - CORRECT-ANSWERSOxygen and bacteria
Sludge treatment and methods - CORRECT-ANSWERSto stabilize the sludge
so that there is a low oxygen demand using aerobic and anaerobic digestion
how does aerobic digestion of sludge differ from anaerobic digestion -
CORRECT-ANSWERSanaerobic digester -anaerobic bacteria (which do not
require dissolved oxygen) break down the solids in the sludge to methane
gas, carbon dioxide and inert solids. Aerobic digesters, microorganisms also
break down the sludge - eventually as food runs out the microorganisms will
use their own stored body mass for energy, resulting in a stable final product
list 3 secondary treatment processes - CORRECT-ANSWERSActivated sludge
is most common in Ontario. Other methods are Sequencing Batch Reactor,
Trickling Filters, Rotating Biological Contractors, Moving Bed Biological
Reactor and aerated lagoons
Describe Sequencing Batch Reactor differs - CORRECT-ANSWERSSBRs are
time-oriented batch systems rather than continuous flow through tanks
"Attached-growth" principle and name 3 systems - CORRECT-
ANSWERSmicroorganisms responsible for treatment of wastewater are
attached to some inert material (instead of being held in suspension) -
Trickling Filters, Rotating biological Contractor, Moving Bed Biological
Reactor and Membrane Biological Reactor use this method
Sludge is dewatered - CORRECT-ANSWERSto remove water, often chemicals
will be added to assist, methods include vacuum filtering, centrifuging,
pressing, or drying beds
forms of tertiary treatment - CORRECT-ANSWERSinclude chemical
precipitation, revers osmosis, carbon adsorption, filtration and membrane
filtration
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