INTRODUCTION TO BIOLOGICAL OXYGEN DEMAND

What is the meaning of BOD ?

• the amount of oxygen microorganisms require to break down organic materials

• the amount of oxygen required to break down the organic material via oxidation.

Is COD equal to BOD? YES or NO

• NO

• YES

What method used for BOD procedure?

• Merck Method 5210 B

• APHA Method 5210 A

• HACH Method 8043

• APHA Method 5220 B

What is the incubation period for the determination of BOD?

• 5 days at 20℃

• 5 days at 30℃

• 3 days at 20℃

• 3 days at 30℃

In BOD analysis, nutrient buffer pillows are used to prepare the BOD dilution water, ensuring the microorganisms have the necessary nutrients to _________ organic matter and accurately measure oxygen consumption.

Does high BOD mean low activity of bacteria?

• YES

• NO