Exam (elaborations)
TX Class C Wastewater Treatment License Questions and Answers
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TX Class C Wastewater Treatment License Questions and Answers
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TX Class C Wastewater TreatmentLicense Questions and Answers
% reduction formula - ANSWER-incoming - outgoing/incoming X 100
1 acre = - ANSWER-43,560 ft squared
1 acre will treat approximately __________ lb BOD - ANSWER-35
1 day = __________ minutes - ANSWER-1440
1 gallon of water weighs.. - ANSWER-8.34 pounds
1 Liter = - ANSWER-1000 milliliters (mL)
1 mg/L = - ANSWER-1 parts per million (ppm) in water
1 MGAD = - ANSWER-23 gpd/ft cubed
1 mL of water weights - ANSWER-1 gram (g)
1,000,000 gallons per day = - ANSWER-1 MGD
27 ft cubed = - ANSWER-1 yard cubed
43,560 ft cubed = - ANSWER-1 acre-ft
7.48 gal = - ANSWER-1 ft cubed
8.34 lb in 1 MG of water = - ANSWER-1 ppm (8.34 lb/8,340,000)
A BOD test is... - ANSWER-a major parameter in quality control
A buildup of solids in the tank of the rotating biological contactor may be caused by... -
ANSWER-poor primary clarification
A cause of poor quality supernatant liquor could be... - ANSWER-digester overload
A chemical factor influencing the efficiency of wastewater stabilization ponds is... -
ANSWER-carbon dioxide
A condition(s) that adversely affect(s) the operation of a rotating biological contactor is...
- ANSWER-toxic materials from industrial wastes; hydrogen sulfide; high or low pH
, A conventional activated sludge process has primary clarifiers that remove about
________ percent of the organic load.. - ANSWER-30-40%
A flow totalizer is required when the plant design flow is more than - ANSWER-0.5 MGD
A flow-weighted "composite" sample is a... - ANSWER-combination of portions of
samples collected at regular intervals and combined according to flow
A gas found in treatment systems that is NOT dangerous - ANSWER-dissolved oxygen
A low oxygen uptake rate might indicate... - ANSWER-toxic waters, low DO or low BOD
A low SVI may indicate... - ANSWER-sludge is settling too fast
A minimum value of _________ of oxygen should be maintained in the aerobic digester
at all times. - ANSWER-1.0 mg/L
A primary clarifier should remove most of what? - ANSWER-settleable solids
Adequate chlorine residuals will... - ANSWER-destroy pathogenic organisms
Administrative penalties, up to __________ per day for each violation, may be assessed
against any violator. - ANSWER-$25,000
Advanced treatment processes strive to provide a ______________ removal level of
specific compounds, suspended solids, and oxygen-demanding materials than cannot
be achieved through secondary treatment alone. - ANSWER-higher
All anaerobic digester roofs/covers should be equipped with pressure relief, vacuum
relief and _________. - ANSWER-flame-trap valves
Anaerobic digester mixing methods include - ANSWER-gas mixing and mechanical
mixing
Anaerobic lagoon dissolved oxygen content... - ANSWER-none
As what materials are decomposed, their phosphorus content is converted to
orthophosphate? - ANSWER-organic
At 20'C the HOCl (hypochlorous acid) concentration will vary with the pH as follows: -
ANSWER-pH 7 - 80% HOCl
Basic elements of a trickling filter are... - ANSWER-floor and walls; distributor arms;
underdrains and media
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