Exam (elaborations)
2024 OIT TRAINING MANUAL MODULE 7 DRINKING WATER TREATMENT EXAM WITH ANSWERS
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2024 OIT TRAINING MANUAL MODULE 7 DRINKING WATER TREATMENT EXAM WITH ANSWERS
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2024 OIT TRAINING MANUALMODULE 7 DRINKING WATER
TREATMENT EXAM WITH
ANSWERS
Pre-treatment - CORRECT-ANSWERSRaw water is pumped from the source;
pre-sedimentation and/or pre-chlorination may be needed
Pre-sedimentation - CORRECT-ANSWERSprocess meant to remove large
particles such as sand and organic debris
pre-chlorination - CORRECT-ANSWERSA powerful disinfecting agent is added
early in the water-treatment process to kill disease-causing organisms;
remove potential odours; to control zebra mussels
purpose of jar test - CORRECT-ANSWERSto determine the optimal chemical
doses by stimulating plant conditions on a smaller scale
used for the flocculation/coagulation processes
purpose of backwashing - CORRECT-ANSWERSclean media filters; done every
1 to 4 days
method of backwashing - CORRECT-ANSWERSnormal water flow is shut off
and treated water is pumped up, backwards through the filter media to
remove entrapped matter.
Sufficient Time - CORRECT-ANSWERSmost important factor for ensuring that
chlorine has effectively inactivated microorganisms
aeration - CORRECT-ANSWERSthe process by which air is circulated through,
mixed with or dissolved in a liquid or substance.
used for stripping or removing VOCs or undesirable gases from water
methods used for treatment of iron and manganese - CORRECT-
ANSWERSsequestering
oxidation and filitration
Fluoride - CORRECT-ANSWERSadded to water to prevent tooth decay
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