TCOT - Ch. 3: Specialized Treatment Process Questions
With Complete Solutions
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? Correct Answers
According to the EPA, what is the maximum contaminant level
for arsenic? Correct Answers 0.010 mg/L
Calculate the annual TTHM average in milligrams per liter
(mg/L) given the following quarterly TTHM data: Q1 =
0.03mg/L, Q2 = 0.12 mg/L, Q3 = 0.15 mg/L, and Q4 = 0.08
mg/L. Correct Answers 0.095 mg/L
Calculate the required potassium permanganate dose in
milligrams per liter (mg/L) if the raw water being pumped from
a well contains 4.5 mg/L of iron and 0.25 mg/L of manganese.
Correct Answers 1.40 mg/L
Determine the chemical feeder setting in grams per second if 3.8
million liters per y are treated with a dose of 7 milligrams per
liter. Correct Answers 0.308 g/s
Determine the chemical feeder setting inn pounds of
polyphosphate per day if 0.83 million gallons per day is treated
with a dose of 4.5 milligrams per liter. Correct Answers 31 lb/d
How can the presence of iron and manganese in a water be
easily determined? Correct Answers By the color of the inside
of the water filter or filter media.
, How can you tell when a manganese greensand CR filter needs
to be backwashed to remove particulates? Correct Answers
When head loss reaches a predetermined point.
How long does it commonly take to complete the four steps of a
THM control strategy? Correct Answers Depends on the
complexity of the chosen strategy
If a groundwater source serves a population of 250,000, how
many dual samples should be taken quarterly? Correct Answers
Six
In what conditions do small, controlled doses of ozone act as an
effective microflocculant and improve the physical removal of
THM precursors? Correct Answers Water is relatively warm
with high organic matter levels.
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? Correct Answers 58 lb/Mgal
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? Correct Answers 0.019 mg/L
With Complete Solutions
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? Correct Answers
According to the EPA, what is the maximum contaminant level
for arsenic? Correct Answers 0.010 mg/L
Calculate the annual TTHM average in milligrams per liter
(mg/L) given the following quarterly TTHM data: Q1 =
0.03mg/L, Q2 = 0.12 mg/L, Q3 = 0.15 mg/L, and Q4 = 0.08
mg/L. Correct Answers 0.095 mg/L
Calculate the required potassium permanganate dose in
milligrams per liter (mg/L) if the raw water being pumped from
a well contains 4.5 mg/L of iron and 0.25 mg/L of manganese.
Correct Answers 1.40 mg/L
Determine the chemical feeder setting in grams per second if 3.8
million liters per y are treated with a dose of 7 milligrams per
liter. Correct Answers 0.308 g/s
Determine the chemical feeder setting inn pounds of
polyphosphate per day if 0.83 million gallons per day is treated
with a dose of 4.5 milligrams per liter. Correct Answers 31 lb/d
How can the presence of iron and manganese in a water be
easily determined? Correct Answers By the color of the inside
of the water filter or filter media.
, How can you tell when a manganese greensand CR filter needs
to be backwashed to remove particulates? Correct Answers
When head loss reaches a predetermined point.
How long does it commonly take to complete the four steps of a
THM control strategy? Correct Answers Depends on the
complexity of the chosen strategy
If a groundwater source serves a population of 250,000, how
many dual samples should be taken quarterly? Correct Answers
Six
In what conditions do small, controlled doses of ozone act as an
effective microflocculant and improve the physical removal of
THM precursors? Correct Answers Water is relatively warm
with high organic matter levels.
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? Correct Answers 58 lb/Mgal
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? Correct Answers 0.019 mg/L
