True and False - 5 Flashcards
(25 cards)
Activated sludge blower electrical costs is a major cost in operating an activated sludge plant
T
Activated sludge contains bacteria, microorganisms and animals
T
The wasting rate for a pure oxygen activated sludge plant is normally the same as for a conventional activated sludge plant
F
Step feed oxygen demand is more uniform than conventional activated sludge
T
A low F/M ratio is the main concern when starting up an activated sludge basin and is indicated by white foam
F
Continuous sludge solid or MLSS wasting will decrease secondary process efficiency
F
Immediately increase wasting if you see a white crispy foam in the aeration basin
F
The operator should increase the F/M ratio when the temperature drops
F
Amboids indicate a relative low sludge age
T
Rotifers indicate a low sludge age
F
The bacteria in wastewater so the treatment while microorganisms are used as indicators
T
Algae will cause bright green pond color and indicate proper operations
T
A facultative pond should be operated at a lower water level than an aerobic pond
F
Chloramines have no disinfection value
F
After all chlorine reactions have been completed, the remaining chlorine is termed free available chlorine
T
Chlorine gas combines with moisture in the air to form hydrochloric gas
T
A low chlorine dose can be used for microorganism control in secondary processes
T
Coliform bacteria can be used as an indicator of disease causing organism
T
Chlorine is a quicker disinfectant at increased wastewater temperature
T
Flexible piping, sometimes called a pigtail, should connect a chlorine container to stationary piping
T
Fixed solids reduction is much higher than volatile solids reduction in an aerobic digester
F
In anaerobic and aerobic processes, the pH and temperature will influence the type of microorganisms present
T
Volatile solids will be reduced by about 50% in a properly operating anaerobic sludge digester
T
Normal practice is to clean an anaerobic sludge digester every 4-7 years
T
