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