Wastewater collections quizzes & 100% Correct
Answers
A shock load is unusually strong wastewater discharged from a waste source. (True / False)
True (See page 1-3)
Wastewater is channeled to the collection system from the source, then to the treatment
plant, and then is discharged to a receiving stream. (True / False)
True (See page 1-4)
Septic wastewater is easy to treat, but fresh wastewater is difficult to treat and results in
lower quality effluent. (True / False)
False, the opposite is true (See page 1-5)
The amount of wastewater collected depends on economic status, water rates, climate,
infiltration/inflow, and industry. (True / False)
True (See page 1-5)
When industry has its own water supply and discharges wastewater to the city collection
system, the city wastewater volume decreases in proportion to the amount of water
supplied by the industry. (True / False)
False, the volume INCREASES (See page 1-6)
The increased flow and BOD introduced by home garbage grinders decreases line septicity
and plant loading. (True / False)
False, it INCREASES line septicity and plant loading (See page 1-6)
,The four categories of wastewater characteristics are physical, chemical, bacteriological,
and radiological. (True / False)
True (See page 1-6)
Physical characteristics are detected by the senses such as smell and sight. (True / False)
True (See page 1-6)
Fresh domestic wastewater is black in color, has a strong fecal odor, suspended particles
that are difficult to see, gas bubbles that may rise to the surface, and contains no dissolved
oxygen. (True / False)
False, this is true of septic wastewater (See page 1-7)
When dissolved oyxgen is gone, anaerobic decomposition begins producing acid and
odorous gases. (True / False)
True (See page 1-7)
Hot water contains more dissolved oxygen than cool water. (True / False)
False, it contains LESS dissolved oxygen than cool water (See page 1-7)
One mg/L or one ppm is one pound of material in a million pounds of water. (True / False)
True (See page 1-7)
Wastewater is approximately 9.99% water, 1% solids, and a small amount of gas. (True /
False)
False, it is approximately 99.99% water and 0.1% solids (See page 1-7)
,Suspended solids can be removed by filtration, but dissolved solids pass through a filter.
(True / False)
True (See page 1-8)
Organics are produced by plants, animals or humans. (True / False)
True (See page 1-8)
"Inorganic" means not organic and examples are sand, metal and rock. (True / False)
True (See page 1-8)
The pH scale ranges from 1 to 14 and measures the hydrogen ion concentration in water,
indicating how acidic or alkaline a solution is. (True / False)
False, the scale ranges from 0 to 14 (See page 1-8)
A pH of 7 is neutral and below 7 is a base, above 7 is an acid. (True / False)
False, below 7 is an acid, and above 7 is a base (See page 1-8)
Hydrogen sulfide is toxic, corrosive, flammable, heavier than air, deadens the sense of
smell, and has a rotten egg odor. (True / False)
True (See page 1-9)
Carbon dioxide has no color or odor, is suffocating, corrosive, heavier than air, and
flammable. (True / False)
False, it is NOT flammable (See page 1-10)
Methane (natural) gas is lighter than air, explosive, colorless, and odorless. (True / False)
, True (See page 1-10)
Oil and grease in wastewater may cause which of the following?
Explosions
Fires
Stoppages
Odor
All listed (See page 1-11)
Excessive chlorides interfere with treatment and effect wastewater _________.
lab tests (See page 1-11)
The BOD test indicates the amount of organic matter that can be oxidized by biological and
chemical action in ______ days at ______ degrees Celsius.
5 days, 20 degrees Celsius (See page 1-12)
Bacteria requiring free, uncombined oxygen are called what?
Aerobic (See page 1-12)
Bacteria requiring combined oxygen are called what?
Anaerobic (See page 1-12)
Bacteria able to metabolize free or combined oxygen are called what?
Facultative (See page 1-12)
Disease-causing microorganisms are called what?
Answers
A shock load is unusually strong wastewater discharged from a waste source. (True / False)
True (See page 1-3)
Wastewater is channeled to the collection system from the source, then to the treatment
plant, and then is discharged to a receiving stream. (True / False)
True (See page 1-4)
Septic wastewater is easy to treat, but fresh wastewater is difficult to treat and results in
lower quality effluent. (True / False)
False, the opposite is true (See page 1-5)
The amount of wastewater collected depends on economic status, water rates, climate,
infiltration/inflow, and industry. (True / False)
True (See page 1-5)
When industry has its own water supply and discharges wastewater to the city collection
system, the city wastewater volume decreases in proportion to the amount of water
supplied by the industry. (True / False)
False, the volume INCREASES (See page 1-6)
The increased flow and BOD introduced by home garbage grinders decreases line septicity
and plant loading. (True / False)
False, it INCREASES line septicity and plant loading (See page 1-6)
,The four categories of wastewater characteristics are physical, chemical, bacteriological,
and radiological. (True / False)
True (See page 1-6)
Physical characteristics are detected by the senses such as smell and sight. (True / False)
True (See page 1-6)
Fresh domestic wastewater is black in color, has a strong fecal odor, suspended particles
that are difficult to see, gas bubbles that may rise to the surface, and contains no dissolved
oxygen. (True / False)
False, this is true of septic wastewater (See page 1-7)
When dissolved oyxgen is gone, anaerobic decomposition begins producing acid and
odorous gases. (True / False)
True (See page 1-7)
Hot water contains more dissolved oxygen than cool water. (True / False)
False, it contains LESS dissolved oxygen than cool water (See page 1-7)
One mg/L or one ppm is one pound of material in a million pounds of water. (True / False)
True (See page 1-7)
Wastewater is approximately 9.99% water, 1% solids, and a small amount of gas. (True /
False)
False, it is approximately 99.99% water and 0.1% solids (See page 1-7)
,Suspended solids can be removed by filtration, but dissolved solids pass through a filter.
(True / False)
True (See page 1-8)
Organics are produced by plants, animals or humans. (True / False)
True (See page 1-8)
"Inorganic" means not organic and examples are sand, metal and rock. (True / False)
True (See page 1-8)
The pH scale ranges from 1 to 14 and measures the hydrogen ion concentration in water,
indicating how acidic or alkaline a solution is. (True / False)
False, the scale ranges from 0 to 14 (See page 1-8)
A pH of 7 is neutral and below 7 is a base, above 7 is an acid. (True / False)
False, below 7 is an acid, and above 7 is a base (See page 1-8)
Hydrogen sulfide is toxic, corrosive, flammable, heavier than air, deadens the sense of
smell, and has a rotten egg odor. (True / False)
True (See page 1-9)
Carbon dioxide has no color or odor, is suffocating, corrosive, heavier than air, and
flammable. (True / False)
False, it is NOT flammable (See page 1-10)
Methane (natural) gas is lighter than air, explosive, colorless, and odorless. (True / False)
, True (See page 1-10)
Oil and grease in wastewater may cause which of the following?
Explosions
Fires
Stoppages
Odor
All listed (See page 1-11)
Excessive chlorides interfere with treatment and effect wastewater _________.
lab tests (See page 1-11)
The BOD test indicates the amount of organic matter that can be oxidized by biological and
chemical action in ______ days at ______ degrees Celsius.
5 days, 20 degrees Celsius (See page 1-12)
Bacteria requiring free, uncombined oxygen are called what?
Aerobic (See page 1-12)
Bacteria requiring combined oxygen are called what?
Anaerobic (See page 1-12)
Bacteria able to metabolize free or combined oxygen are called what?
Facultative (See page 1-12)
Disease-causing microorganisms are called what?
