Texas Wastewater B exam
In an activated sludge treatment system, primary treatment processes include the: -
answers✔✔Primary Clarifiers
In a washing grit remover, the grit is moved slowly by screw conveyors up an inclined channel in order
to? - answers✔✔Removal of Inorganic material from grit
An efficient primary clarifier is expected to remove ? of the influent settleable solids. - answers✔✔90%
or above
Proper operation of a facultative pond system requires that:, - answers✔✔Adequate DO at surface at all
times
The amount of organic matter removed by a trickling filter is mostly dependent on the recirculation ratio
- answers✔✔True
In an activated sludge treatment plant, a Sludge Volume Index (SVI) of 180 would indicate -
answers✔✔Bulking
The purpose of returning the solids from the bottom of the clarifier to the aeration tank in the activated
sludge process is to - answers✔✔Reseed The AB, Remove sludge from FC
Microscopic examination of a good-settling sludge should show a predominance of: - answers✔✔Free
swimmer rotifers stalked ciliates
When nitrification takes place in the activated sludge process, facultative bacteria use -
answers✔✔Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate
, 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? - answers✔✔Primary clarifiers
One indication that an anaerobic digestion facility is improving would be? - answers✔✔Low C02 high
Methane
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? - answers✔✔False
Besides disinfection, chlorination can be used in wastewater treatment processes to? -
answers✔✔Control odor, Reduce BOD ,Control foaming, Aid in sludge
If released to atmospheric pressure, one part liquid chlorine will expand to about? - answers✔✔450ml
Anaerobically digested sludge should be applied to a drying bed to a depth of about? - answers✔✔8-12"
Sludge from a digester should be slowly drawn to a drying bed in order to? - answers✔✔Not to create a
negative pressure in the anaerobic digester and to prevent coning of sludge
Direct aquifer recharge of treated effluent can be used to? - answers✔✔Recharge Water supply, keep
saline out of groundwater stop ground Substance
An exemption from filing monthly effluent reports with the TCEQ may be obtained if? -
answers✔✔under new construction, new plant, not running yet
A wastewater treatment plant would make use of ? to remove small concentrations of dissolved
organics from wastewater effluent - answers✔✔Screens
The maximum design organic loading for stabilization ponds is 35 pounds of BOD per acre per day. An
industry wants to construct a facility with projected flow of 50,000 gpd and an average BOD of 450 mg/l.
A stabilization pond to serve this projected loading would need to be a minimum size of? -
answers✔✔5.4 acres
In an activated sludge treatment system, primary treatment processes include the: -
answers✔✔Primary Clarifiers
In a washing grit remover, the grit is moved slowly by screw conveyors up an inclined channel in order
to? - answers✔✔Removal of Inorganic material from grit
An efficient primary clarifier is expected to remove ? of the influent settleable solids. - answers✔✔90%
or above
Proper operation of a facultative pond system requires that:, - answers✔✔Adequate DO at surface at all
times
The amount of organic matter removed by a trickling filter is mostly dependent on the recirculation ratio
- answers✔✔True
In an activated sludge treatment plant, a Sludge Volume Index (SVI) of 180 would indicate -
answers✔✔Bulking
The purpose of returning the solids from the bottom of the clarifier to the aeration tank in the activated
sludge process is to - answers✔✔Reseed The AB, Remove sludge from FC
Microscopic examination of a good-settling sludge should show a predominance of: - answers✔✔Free
swimmer rotifers stalked ciliates
When nitrification takes place in the activated sludge process, facultative bacteria use -
answers✔✔Dissolved oxygen (DO) or oxygen obtained from food materials such as sulfate or nitrate
, 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? - answers✔✔Primary clarifiers
One indication that an anaerobic digestion facility is improving would be? - answers✔✔Low C02 high
Methane
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? - answers✔✔False
Besides disinfection, chlorination can be used in wastewater treatment processes to? -
answers✔✔Control odor, Reduce BOD ,Control foaming, Aid in sludge
If released to atmospheric pressure, one part liquid chlorine will expand to about? - answers✔✔450ml
Anaerobically digested sludge should be applied to a drying bed to a depth of about? - answers✔✔8-12"
Sludge from a digester should be slowly drawn to a drying bed in order to? - answers✔✔Not to create a
negative pressure in the anaerobic digester and to prevent coning of sludge
Direct aquifer recharge of treated effluent can be used to? - answers✔✔Recharge Water supply, keep
saline out of groundwater stop ground Substance
An exemption from filing monthly effluent reports with the TCEQ may be obtained if? -
answers✔✔under new construction, new plant, not running yet
A wastewater treatment plant would make use of ? to remove small concentrations of dissolved
organics from wastewater effluent - answers✔✔Screens
The maximum design organic loading for stabilization ponds is 35 pounds of BOD per acre per day. An
industry wants to construct a facility with projected flow of 50,000 gpd and an average BOD of 450 mg/l.
A stabilization pond to serve this projected loading would need to be a minimum size of? -
answers✔✔5.4 acres
