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2024 WATER SIFU (15) WATER TREATMENT EXAM PREP T1-T4 WITH CORRECT ANSWERS
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2024 WATER SIFU (15) WATER TREATMENT EXAM PREP T1-T4 WITH CORRECT ANSWERS
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2024 WATER SIFU (15) WATERTREATMENT EXAM PREP T1-T4
WITH CORRECT ANSWERS
List 3 ways of removing odors from water? - CORRECT-
ANSWERSConventional Treatment
Oxidation
Adsorption (GAC)
Why control iron and manganese? (whats the problem?) - CORRECT-
ANSWERS-Undesirable color in water
-Stain clothes and plumbing fixtures
-Promote the growth of iron bacteria which cause taste & odors
What are the effects of excess lead? - CORRECT-ANSWERSExcess lead
causes altered physical and mental development in children
Also causes high blood pressure
What is the problem with water high in total dissolved solids (TDS)? -
CORRECT-ANSWERSBad taste (it tastes like shit! go drink the Lante water
and see!)
What is the best way to remove high TDS? - CORRECT-ANSWERSReverse
Osmosis
Organic Precursors (as decay) they put out what? - CORRECT-ANSWERS2
acids: Humic & Fulvic acid
Then add chlorine to that and it causes Trihalomethanes
What is the issue with Trihalomethanes? - CORRECT-ANSWERSThe resulting
compounds of Trihalomethanes (THM's) are suspected of causing cancer
(MCL is 80 ppb)
List 3 ways to deal with Trihalomethanes.... - CORRECT-ANSWERS1. Get rid of
pre-chlorination (filter organic matter first)
2. Conventional Treatment with adsorption
3. Granular activated carbon (GAC) after they are formed
, What does Organic substance mean? - CORRECT-ANSWERS(eww gross -get
serious)
Organic substances come from animal or plant substances and CONTAIN
CARBON
What is titration? - CORRECT-ANSWERSTitration is when a chemical solution
of known strength is added drop by drop until a certain point where the
reaction occurs (like color, precipitate or pH change is observed).
DPD with chlorine residual or like at Lante they use drops to get the peroxide
residual
What is supernatant? - CORRECT-ANSWERSThe liquid between the sludge on
the bottom or skum on the water surface (area in the middle). Probably in
the sedimentation basin.
Absorption - CORRECT-ANSWERSAbsorbs like a sponge into itself
(ADsorption sticks to on surface but doesn't absorb anything into itself)
Osmosis - CORRECT-ANSWERSThe passage of a liquid from a weak solution
to a concentrated solution through a membrane. Reverse Osmosis is what
we use in the water industry. That definition is: The application of pressure to
a concentrated solution which causes the passage of liquid from a
concentrated solution to a weaker solution across a membrane.
Composite sample is....? - CORRECT-ANSWERS"Is a sample of water
composed of a collection of individual samples collected at regular intervals
collected in one container." representative sample
We take these at the Baker Tank discharge line when we are discharging into
the sewer for LACSD. It pulls a sample 1x an hour for 24 hours and dumps
every sample into one giant jar. Then the lab analyzes that sample and gives
1 result for 24 hours. We test for pH, and suspended solids.
This type of sample is NEVER used for bacteria.
What is indirect potable re-use? - CORRECT-ANSWERSUse of water from
streams that have upstream discharges of wastewater.
Heterotrophs are.....? - CORRECT-ANSWERSOrganisms that use organic
matter for growth. Animals, fungi and most bacteria are heterotrophs.
Go to watersifu.com and you can listen to these flash cards, which I strongly
recommend it is really helpful. But I've typed them in for you to drill yourself.
- CORRECT-ANSWERSGo!
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