Biochemical Oxygen Demand (BOD) Testing

This video tutorial explains how to conduct a Biochemical Oxygen Demand (BOD) test, crucial for assessing the oxygen requirements of water, particularly in wastewater treatment. It covers the necessary equipment, preparation of dilution water, sample preparation, and the process of measuring dissolved oxygen before and after incubation. The video also details the factors affecting BOD, the setup of initial tests, and the calculation of BOD values, ensuring quality control throughout the process.

What is the primary purpose of measuring Biochemical Oxygen Demand (BOD) in water?

• To determine the color of the water

• To calculate the pH level of the water

• To measure the temperature of the water

• To assess the oxygen requirements for organic matter degradation

Which of the following is NOT a factor affecting BOD measurements?

• Presence of microorganisms

• Temperature

• Water color

• pH level

What is the purpose of using a nutrient pillow packet in a BOD test?

• To add color to the water

• To provide nutrients for microbial growth

• To increase the water temperature

• To remove chlorine from the water

Which equipment is essential for measuring dissolved oxygen in a BOD test?

• Colorimeter

• Dissolved oxygen probe

• pH meter

• Thermometer

What should be done if the pH of a sample is outside the 6 to 8 range?

• Increase the temperature of the sample

• Ignore the pH and proceed with the test

• Add more dilution water

• Adjust it to 7.0 to 7.2 using sulfuric acid or sodium hydroxide

Why is it important to use seed in some BOD samples?

• To ensure adequate oxygen depletion in weak samples

• To increase the sample volume

• To change the color of the sample

• To adjust the pH level

What is the purpose of creating a BOD blank during the test setup?

• To ensure the dilution water is uncontaminated

• To measure the color change in the sample

• To add nutrients to the sample

• To increase the sample's pH

How long should the BOD samples be incubated?

• 7 days

• 5 days

• 3 days

• 2 days

What is the minimum final dissolved oxygen level required to pass QC requirements?

• 0.5 mg/L

• 2 mg/L

• 1 mg/L

• 1.5 mg/L

What is the acceptable range for GGA recovery in a BOD test?

• 100 to 150 mg/L

• 150 to 200 mg/L

• 167.5 to 228.5 mg/L

• 200 to 250 mg/L