Multiple Choice Flashcards
The most probable cause of denitrification in an activated sludge plan is
The failure to return the settled mixed liquor to the aeration basin soon enough
Which one of the following is sometimes used as an additive in correcting anaerobic digester upsets?
Unslaked quicklime
When collecting a sample of chlorinated effluent for the total coliform test, which one of the following statements reflects correct sampling procedure?
Add sodium thiosulfate to the bottle prior to sterilization of collection bottle
Normal operating range of a DAF thickening of WAS using polymers?
Solids loading rate of 1.0 lb/ sqft *hr
What is true is regards to the complete-mix activated sludge process?
Rate of O2 uptake per unit of activated sludge is about the same throughout all of the aeration basin.
SV is best defined as
the volume occupied by one gram of MLSS after settling for 30 mins in the sludge settleability test
Which of the following is a reasonable statement in regards to heating an anaerobic digester?
It takes one BTU of heat energy to raise the temperature of one pound of sludge be one degree Fahrenheit
