TX Class C Wastewater Treatment License Test Questions and Answers
Rated A
the 1st stage of sewage treatment where large debris,
such as sticks, grit, and rags pas through a screen followed
Preliminary Treatment
by a grit chamber, where the flow of water is slowed
enough to allow for sedimentation.
What stage of treatment is grit removal usually accom-
preliminary treatment
plished in?
Rotating Biological Contactor a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) de-
disinfection
stroyed?
Other than stream discharge, what are other ways to dis- aquifer recharge, evaporation in a pond, and application
pose of effluent wastewater? to farm land by irrigation
gives the basic structure for regulating discharges of pol-
Clean Water Act
lutants into the waters of the United States
gives the TCEQ jurisdiction over discharges of waste into
Texas Water Code
or adjacent to water in the state
Who reviews plans and specifications for new construction
TCEQ
projects before construction begins?
Water quality fees may be as high as per
$115,000
permit?
Administrative penalties, up to per day for
$25,000
each violation, may be assessed against any violator.
Every city with more than in population needs
to establish a water pollution control program and hire 10,000
qualified personnel to administer it.
State law requires that reports are to be submitted no later
20
than the th day of the following month.
segments
,TX Class C Wastewater Treatment License Test Questions and Answers
Rated A
What are major surface waters classified as for the pur-
poses of water quality management and designation of
site-specific standards?
direct discharges of storm water or surface water into a
wastewater collection system (storm drains, roof gutters,
Inflow
yard drains, basement sump pumps and broken man-
holes and wastewater lines).
How many gallons per day will each person contribute to
100
the wastewater treatment plant?
How much BOD will each person contribute to the waste-
0.17
water treatment plant each day?
Cause of septic wastewater bacterial action
Classifications of solids in wastewater fixed/ash, suspended/dissolved, organic/inorganic
carbon, hydrogen and oxygen (animal and vegetable in
Organic compounds in wastewater include
nature)
Type of organic matter present in wastewater proteins
BOD is a measure of what? oxygen used up
untreated waste discharges, algae masses at night, and
Ways that oxygen can be depleted in streams
high BOD in the effluent
A gas found in treatment systems that is NOT dangerous dissolved oxygen
Cycles of decay include carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is
0.5 MGD
more than
Non-hazardous wastes include chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include cyanide, sulfides, organics and gasoline
Synergistic Ettect reaction between waste streams
, TX Class C Wastewater Treatment License Test Questions and Answers
Rated A
How many cubic feet of screenings per million gallons of
0.5 to 6.0
wastewater will coarse screens remove?
Preaeration benefits freshen wastewater, scour gases and remove grease
allow scum to rise and solids to settle under quiescent (low
Main purpose of sedimentation tank
velocity) conditions
How much settleable solids is removed in primary settling? 90-95%
How much suspended solids is removed in primary set-
50-70%
tling?
How much BOD is removed in primary settling? 35%
How much total organic matter is removed in primary
20-30%
settling?
What percentage of suspended solids will settle out within
70%
2 hours?
Required minutes of detention time for peak flow? 54
Required minutes of detention time for design flow? 108
wear on pump impellers, line stoppages and taking up
Benefits of removing grit
space
Too high a velocity in a grit chamber can result in what? excess grit in primary clarifier
One of the benefits of pre-aeration is gas and grease removal
Why does grit need to be washed? because organic matter clings to it
What is a flow equalization used for? to reduce excessive flows or organic loads
How can grease be removed before sedimentation? by chlorination, aeration and skimming
A primary clarifier should remove most of what? settleable solids
What conditions can influence settling of solids? temperature, condition of solids and flow velocity
Sludge from a primary clarifier should have a moisture
94-96%
content of what?
Rated A
the 1st stage of sewage treatment where large debris,
such as sticks, grit, and rags pas through a screen followed
Preliminary Treatment
by a grit chamber, where the flow of water is slowed
enough to allow for sedimentation.
What stage of treatment is grit removal usually accom-
preliminary treatment
plished in?
Rotating Biological Contactor a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) de-
disinfection
stroyed?
Other than stream discharge, what are other ways to dis- aquifer recharge, evaporation in a pond, and application
pose of effluent wastewater? to farm land by irrigation
gives the basic structure for regulating discharges of pol-
Clean Water Act
lutants into the waters of the United States
gives the TCEQ jurisdiction over discharges of waste into
Texas Water Code
or adjacent to water in the state
Who reviews plans and specifications for new construction
TCEQ
projects before construction begins?
Water quality fees may be as high as per
$115,000
permit?
Administrative penalties, up to per day for
$25,000
each violation, may be assessed against any violator.
Every city with more than in population needs
to establish a water pollution control program and hire 10,000
qualified personnel to administer it.
State law requires that reports are to be submitted no later
20
than the th day of the following month.
segments
,TX Class C Wastewater Treatment License Test Questions and Answers
Rated A
What are major surface waters classified as for the pur-
poses of water quality management and designation of
site-specific standards?
direct discharges of storm water or surface water into a
wastewater collection system (storm drains, roof gutters,
Inflow
yard drains, basement sump pumps and broken man-
holes and wastewater lines).
How many gallons per day will each person contribute to
100
the wastewater treatment plant?
How much BOD will each person contribute to the waste-
0.17
water treatment plant each day?
Cause of septic wastewater bacterial action
Classifications of solids in wastewater fixed/ash, suspended/dissolved, organic/inorganic
carbon, hydrogen and oxygen (animal and vegetable in
Organic compounds in wastewater include
nature)
Type of organic matter present in wastewater proteins
BOD is a measure of what? oxygen used up
untreated waste discharges, algae masses at night, and
Ways that oxygen can be depleted in streams
high BOD in the effluent
A gas found in treatment systems that is NOT dangerous dissolved oxygen
Cycles of decay include carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is
0.5 MGD
more than
Non-hazardous wastes include chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include cyanide, sulfides, organics and gasoline
Synergistic Ettect reaction between waste streams
, TX Class C Wastewater Treatment License Test Questions and Answers
Rated A
How many cubic feet of screenings per million gallons of
0.5 to 6.0
wastewater will coarse screens remove?
Preaeration benefits freshen wastewater, scour gases and remove grease
allow scum to rise and solids to settle under quiescent (low
Main purpose of sedimentation tank
velocity) conditions
How much settleable solids is removed in primary settling? 90-95%
How much suspended solids is removed in primary set-
50-70%
tling?
How much BOD is removed in primary settling? 35%
How much total organic matter is removed in primary
20-30%
settling?
What percentage of suspended solids will settle out within
70%
2 hours?
Required minutes of detention time for peak flow? 54
Required minutes of detention time for design flow? 108
wear on pump impellers, line stoppages and taking up
Benefits of removing grit
space
Too high a velocity in a grit chamber can result in what? excess grit in primary clarifier
One of the benefits of pre-aeration is gas and grease removal
Why does grit need to be washed? because organic matter clings to it
What is a flow equalization used for? to reduce excessive flows or organic loads
How can grease be removed before sedimentation? by chlorination, aeration and skimming
A primary clarifier should remove most of what? settleable solids
What conditions can influence settling of solids? temperature, condition of solids and flow velocity
Sludge from a primary clarifier should have a moisture
94-96%
content of what?
