TX Class C Wastewater Treatment License Exam
Test Questions Best Graded to Score A+
Preliminary Treatment - Answer the 1st stage of sewage treatment where large debris, such as sticks,
grit, and rags pas through a screen followed by a grit chamber, where the flow of water is slowed
enough to allow for sedimentation.
What stage of treatment is grit removal usually accomplished in? - Answer preliminary treatment
Rotating Biological Contactor - Answer a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) destroyed? - Answer disinfection
Other than stream discharge, what are other ways to dispose of effluent wastewater? - Answer aquifer
recharge, evaporation in a pond, and application to farm land by irrigation
Clean Water Act - Answer gives the basic structure for regulating discharges of pollutants into the waters
of the United States
Texas Water Code - Answer gives the TCEQ jurisdiction over discharges of waste into or adjacent to
water in the state
Who reviews plans and specifications for new construction projects before construction begins? -
Answer TCEQ
Water quality fees may be as high as ____________ per permit? - Answer $115,000
Administrative penalties, up to __________ per day for each violation, may be assessed against any
violator. - Answer $25,000
Every city with more than ________ in population needs to establish a water pollution control program
and hire qualified personnel to administer it. - Answer 10,000
,State law requires that reports are to be submitted no later than the ________th day of the following
month. - Answer 20
What are major surface waters classified as for the purposes of water quality management and
designation of site-specific standards? - Answer segments
Inflow - Answer direct discharges of storm water or surface water into a wastewater collection system
(storm drains, roof gutters, yard drains, basement sump pumps and broken manholes and wastewater
lines).
How many gallons per day will each person contribute to the wastewater treatment plant? - Answer 100
How much BOD will each person contribute to the wastewater treatment plant each day? - Answer 0.17
Cause of septic wastewater - Answer bacterial action
Classifications of solids in wastewater - Answer fixed/ash, suspended/dissolved, organic/inorganic
Organic compounds in wastewater include - Answer carbon, hydrogen and oxygen (animal and
vegetable in nature)
Type of organic matter present in wastewater - Answer proteins
BOD is a measure of what? - Answer oxygen used up
Ways that oxygen can be depleted in streams - Answer untreated waste discharges, algae masses at
night, and high BOD in the effluent
A gas found in treatment systems that is NOT dangerous - Answer dissolved oxygen
, Cycles of decay include - Answer carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is more than - Answer 0.5 MGD
Non-hazardous wastes include - Answer chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include - Answer cyanide, sulfides, organics and gasoline
Synergistic Effect - Answer reaction between waste streams
How many cubic feet of screenings per million gallons of wastewater will coarse screens remove? -
Answer 0.5 to 6.0
Preaeration benefits - Answer freshen wastewater, scour gases and remove grease
Main purpose of sedimentation tank - Answer allow scum to rise and solids to settle under quiescent
(low velocity) conditions
How much settleable solids is removed in primary settling? - Answer 90-95%
How much suspended solids is removed in primary settling? - Answer 50-70%
How much BOD is removed in primary settling? - Answer 35%
How much total organic matter is removed in primary settling? - Answer 20-30%
What percentage of suspended solids will settle out within 2 hours? - Answer 70%
Required minutes of detention time for peak flow? - Answer 54
Test Questions Best Graded to Score A+
Preliminary Treatment - Answer the 1st stage of sewage treatment where large debris, such as sticks,
grit, and rags pas through a screen followed by a grit chamber, where the flow of water is slowed
enough to allow for sedimentation.
What stage of treatment is grit removal usually accomplished in? - Answer preliminary treatment
Rotating Biological Contactor - Answer a type of biological secondary treatment process
How are protozoa (cause of amoebic dysentery) destroyed? - Answer disinfection
Other than stream discharge, what are other ways to dispose of effluent wastewater? - Answer aquifer
recharge, evaporation in a pond, and application to farm land by irrigation
Clean Water Act - Answer gives the basic structure for regulating discharges of pollutants into the waters
of the United States
Texas Water Code - Answer gives the TCEQ jurisdiction over discharges of waste into or adjacent to
water in the state
Who reviews plans and specifications for new construction projects before construction begins? -
Answer TCEQ
Water quality fees may be as high as ____________ per permit? - Answer $115,000
Administrative penalties, up to __________ per day for each violation, may be assessed against any
violator. - Answer $25,000
Every city with more than ________ in population needs to establish a water pollution control program
and hire qualified personnel to administer it. - Answer 10,000
,State law requires that reports are to be submitted no later than the ________th day of the following
month. - Answer 20
What are major surface waters classified as for the purposes of water quality management and
designation of site-specific standards? - Answer segments
Inflow - Answer direct discharges of storm water or surface water into a wastewater collection system
(storm drains, roof gutters, yard drains, basement sump pumps and broken manholes and wastewater
lines).
How many gallons per day will each person contribute to the wastewater treatment plant? - Answer 100
How much BOD will each person contribute to the wastewater treatment plant each day? - Answer 0.17
Cause of septic wastewater - Answer bacterial action
Classifications of solids in wastewater - Answer fixed/ash, suspended/dissolved, organic/inorganic
Organic compounds in wastewater include - Answer carbon, hydrogen and oxygen (animal and
vegetable in nature)
Type of organic matter present in wastewater - Answer proteins
BOD is a measure of what? - Answer oxygen used up
Ways that oxygen can be depleted in streams - Answer untreated waste discharges, algae masses at
night, and high BOD in the effluent
A gas found in treatment systems that is NOT dangerous - Answer dissolved oxygen
, Cycles of decay include - Answer carbon, nitrogen and sulfur
A flow totalizer is required when the plant design flow is more than - Answer 0.5 MGD
Non-hazardous wastes include - Answer chlorides, alkalinity, color, phosphorous and iron
Hazardous wastes include - Answer cyanide, sulfides, organics and gasoline
Synergistic Effect - Answer reaction between waste streams
How many cubic feet of screenings per million gallons of wastewater will coarse screens remove? -
Answer 0.5 to 6.0
Preaeration benefits - Answer freshen wastewater, scour gases and remove grease
Main purpose of sedimentation tank - Answer allow scum to rise and solids to settle under quiescent
(low velocity) conditions
How much settleable solids is removed in primary settling? - Answer 90-95%
How much suspended solids is removed in primary settling? - Answer 50-70%
How much BOD is removed in primary settling? - Answer 35%
How much total organic matter is removed in primary settling? - Answer 20-30%
What percentage of suspended solids will settle out within 2 hours? - Answer 70%
Required minutes of detention time for peak flow? - Answer 54
