Texas Wastewater B exam
Primary Clarifiers - correct answer-In an activated sludge treatment system, primary
treatment processes include the:
Removal of Inorganic material from grit - correct answer-In a washing grit remover, the grit is
moved slowly by screw conveyors up an inclined channel in order to?
90% or above - correct answer-An efficient primary clarifier is expected to remove ? of the
influent settleable solids.
Adequate DO at surface at all times - correct answer-Proper operation of a facultative pond
system requires that:,
True - correct answer-The amount of organic matter removed by a trickling filter is mostly
dependent on the recirculation ratio
Bulking - correct answer-In an activated sludge treatment plant, a Sludge Volume Index
(SVI) of 180 would indicate
Reseed The AB, Remove sludge from FC - correct answer-The purpose of returning the
solids from the bottom of the clarifier to the aeration tank in the activated sludge process is
to
Free swimmer rotifers stalked ciliates - correct answer-Microscopic examination of a
good-settling sludge should show a predominance of:
Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate -
correct answer-When nitrification takes place in the activated sludge process, facultative
bacteria use
Primary clarifiers - correct answer-In an activated sludge process, the results of a mixed
liquor settling test indicate that the supernatant of the mixed liquor sample is clear, but the
supernatant of the plant effluent sample is turbid. These test results indicate that the problem
is occurring in the?
Low C02 high Methane - correct answer-One indication that an anaerobic digestion facility is
improving would be?
False - correct answer-The terms "low rate" and "high rate" when used in reference to the
anaerobic digester refer to the rate of stabilization of the raw sludge?
Control odor, Reduce BOD ,Control foaming, Aid in sludge - correct answer-Besides
disinfection, chlorination can be used in wastewater treatment processes to?
Primary Clarifiers - correct answer-In an activated sludge treatment system, primary
treatment processes include the:
Removal of Inorganic material from grit - correct answer-In a washing grit remover, the grit is
moved slowly by screw conveyors up an inclined channel in order to?
90% or above - correct answer-An efficient primary clarifier is expected to remove ? of the
influent settleable solids.
Adequate DO at surface at all times - correct answer-Proper operation of a facultative pond
system requires that:,
True - correct answer-The amount of organic matter removed by a trickling filter is mostly
dependent on the recirculation ratio
Bulking - correct answer-In an activated sludge treatment plant, a Sludge Volume Index
(SVI) of 180 would indicate
Reseed The AB, Remove sludge from FC - correct answer-The purpose of returning the
solids from the bottom of the clarifier to the aeration tank in the activated sludge process is
to
Free swimmer rotifers stalked ciliates - correct answer-Microscopic examination of a
good-settling sludge should show a predominance of:
Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate -
correct answer-When nitrification takes place in the activated sludge process, facultative
bacteria use
Primary clarifiers - correct answer-In an activated sludge process, the results of a mixed
liquor settling test indicate that the supernatant of the mixed liquor sample is clear, but the
supernatant of the plant effluent sample is turbid. These test results indicate that the problem
is occurring in the?
Low C02 high Methane - correct answer-One indication that an anaerobic digestion facility is
improving would be?
False - correct answer-The terms "low rate" and "high rate" when used in reference to the
anaerobic digester refer to the rate of stabilization of the raw sludge?
Control odor, Reduce BOD ,Control foaming, Aid in sludge - correct answer-Besides
disinfection, chlorination can be used in wastewater treatment processes to?
