Sampling
Increase or Decrease
More or Less
Fire Safety
Activated Sludge
100
This is the most frequently used quality control test done in the lab.
What are blanks?
100
Oxygen uptake increases when temperatures ________.
What is increases?
100
Mechanical seals are ________ reliable than packing.
What is more?
100
A fire in a paint storage area is an example of this class of fire.
What is Class B?
100
This is the amount of alkalinity used during nitrification to convert one mg/L of ammonia to nitrate.
What is 7.14 mg/L?
200
Samples should be preserved by refrigeration at a temperature no higher than this.
What is 6 deg C?
200
When an activated sludge microscope exam reveals predomination of flagellates, the operator should do this with the wasting rate.
What is decrease?
200
pH is considered corrosive when it is ______ than 2.0 and ________ than 12.5.
What is less than 2.0 and more than 12.5?
200
An electrical panel fire is an example of this class of fire.
What is Class C?
200
When large clumps of rising sludge are noticed on the surface of secondary clarifiers, this is most likely the cause.
What is denitrification?
300
From the above chart showing BOD results for four samples, this is the only sample with valid results.
What is Sample D?
300
BOD consumption doubles for every 10 degree C ________ in wastewater.
What is increase?
300
Non-point sources of pollution are ________ abundant than point sources.
What is more?
300
A pile of wood fire is an example of this class of fire.
What is Class A?
300
The ratio of MLVSS to MLSS in a typical activated sludge plant.
What is 70-80%?
400
This is the maximum holding time for a nitrate sample.
What is 48 hours?
400
A pond covered in ice and snow would see a(n) ________ in BOD.
What is increase?
400
H2S is most corrosive at a pH ________ than 5.0.
What is less?
400
UEL and LEL are acronyms for these two terms that indicate the range at which combustible gases will ignite.
What are upper explosive limits and lower explosive limits?
400
This is the most important operational variable to control nitrification.
What is SRT?
500
This substance is used in COD titration.
What is mercuric sulfate?
500
When moving from cold winter months to warm summer months, the MCRT should be ________.
What is decreased?
500
Hydrogen sulfide gas is released from wastewater when the pH is ________ than 8.0.
What is less than 8.0?
500
A magnesium fire is an example of this class of fire.
What is Class D?
500
An operator should first do this when they notice a very dark foam on the surface of the aeration basins.
What is increase aeration/DO?