TCOT - CH. 3: SPECIALIZED
TREATMENT PROCESS EXAM
QUESTIONS AND ANSWERS. VERIFIED
2026.
What is the most commonly used oxidant to oxidize As(III) into As(V)? - ANS Chlorine
Why is it a good practice to collect two DBP samples at each location being tested? -
ANS Allows lab to double-check test results
According to the EPA, what is the maximum contaminant level for arsenic? - ANS 0.010 mg/L
A reaction basin 15 feet in diameter and 8 feet deep treats a flow o 350,000 gallons per day.
What is the average detention time in minutes? - ANS
Which polyphosphate is the most effective at the lowest dose in controlling iron and
manganese? - ANS Metaphosphate
In what conditions do small, controlled doses of ozone act as an effective microflocculant and
improve the physical removal of THM precursors? - ANS Water is relatively warm with high
organic matter levels.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, How long does it commonly take to complete the four steps of a THM control strategy? -
ANS Depends on the complexity of the chosen strategy
Where do the As(III) and As(V) forms of arsenic commonly occur? - ANS Groundwater
The concentration of a standard polyphosphate solution is 1 milligram per milliliter. If 7
milliliters of the stock solution are added to a 1-liter sample, what is the polyphosphate dose in
pounds per million gallons? - ANS 58 lb/Mgal
What is one possible problem from regenerating a greensand bed by adding a higher dosage of
potassium permanganate? - ANS Red-colored water in the system
What will happen if a plant exceeds its operational evaluation level under the Stage. DBPR? -
ANS Required to review operational practices and submit a report to the state.
What is the generally acceptable limit for iron in drinking water? - ANS 0.3 mg/L
What region of the US has a disproportionate number of arsenic problems in its water? -
ANS West
What chemical's production can be reduced by controlling the ozone treatment process? -
ANS Bromate
Well 1 delivers a flow of 0.75 million liters per day (MLD) with an arsenic concentration of 0.045
milligrams per liter (mg/L). Well 2 delivers a flow of 1.50 MLD with an arsenic concentration of
0.006 mg/L. What is the blended arsenic concentration in milligrams per liter when the flows
from geese two wells are blended together? - ANS 0.019 mg/L
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
TREATMENT PROCESS EXAM
QUESTIONS AND ANSWERS. VERIFIED
2026.
What is the most commonly used oxidant to oxidize As(III) into As(V)? - ANS Chlorine
Why is it a good practice to collect two DBP samples at each location being tested? -
ANS Allows lab to double-check test results
According to the EPA, what is the maximum contaminant level for arsenic? - ANS 0.010 mg/L
A reaction basin 15 feet in diameter and 8 feet deep treats a flow o 350,000 gallons per day.
What is the average detention time in minutes? - ANS
Which polyphosphate is the most effective at the lowest dose in controlling iron and
manganese? - ANS Metaphosphate
In what conditions do small, controlled doses of ozone act as an effective microflocculant and
improve the physical removal of THM precursors? - ANS Water is relatively warm with high
organic matter levels.
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, How long does it commonly take to complete the four steps of a THM control strategy? -
ANS Depends on the complexity of the chosen strategy
Where do the As(III) and As(V) forms of arsenic commonly occur? - ANS Groundwater
The concentration of a standard polyphosphate solution is 1 milligram per milliliter. If 7
milliliters of the stock solution are added to a 1-liter sample, what is the polyphosphate dose in
pounds per million gallons? - ANS 58 lb/Mgal
What is one possible problem from regenerating a greensand bed by adding a higher dosage of
potassium permanganate? - ANS Red-colored water in the system
What will happen if a plant exceeds its operational evaluation level under the Stage. DBPR? -
ANS Required to review operational practices and submit a report to the state.
What is the generally acceptable limit for iron in drinking water? - ANS 0.3 mg/L
What region of the US has a disproportionate number of arsenic problems in its water? -
ANS West
What chemical's production can be reduced by controlling the ozone treatment process? -
ANS Bromate
Well 1 delivers a flow of 0.75 million liters per day (MLD) with an arsenic concentration of 0.045
milligrams per liter (mg/L). Well 2 delivers a flow of 1.50 MLD with an arsenic concentration of
0.006 mg/L. What is the blended arsenic concentration in milligrams per liter when the flows
from geese two wells are blended together? - ANS 0.019 mg/L
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
