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Biochemical Oxygen Demand (BOD) Test Method

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Biochemical Oxygen Demand (BOD) Test Method

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Questions and Answers

What is the main purpose of the waste water treatment mentioned in the document?

To increase the oxygen levels in water through chemical reactions

To decompose organic materials using microorganisms (correct)

To remove inorganic materials from sewage treatment plants

To reduce the amount of oxygen in water

What are aerobic aquatic microorganisms known for in waste water treatment?

Increasing organic materials in water

Decomposing inorganic materials

Using oxygen to decompose organic materials (correct)

Reducing oxygen levels in water

What department or individual received 2 copies of the document according to the distribution record?

Document Control Room (correct)

Head of Advisory

M.R IMS

Laboratory In charge

What is the term used to describe the amount of oxygen consumed by organisms in breaking down waste?

Biochemical Oxygen Demand Signup and view all the answers

How does lack of oxygen in water affect the growth of aerobic aquatic microbial organisms?

It imposes a limit on their growth Signup and view all the answers

In the context of sewage treatment plants, what does BOD stand for?

Biochemical Oxygen Demand Signup and view all the answers

What is the purpose of using a HACH DR/2400 Spectrophotometer in the described procedure?

To quantify biochemical oxygen demand Signup and view all the answers

What range of oxygen consumption does the test method cover for the microbial metabolism of organic compounds in water?

0 to 700 mg/L Signup and view all the answers

Who is responsible for supervising the testing activity and reporting results to the concerned department according to the text?

Shift in-Charge Signup and view all the answers

What is the purpose of homogenizing the sample before measuring it into a graduated cylinder?

To ensure accurate measurement and representation of the sample. Signup and view all the answers

Why is dilution necessary for samples with BOD values exceeding 700 mg/L?

To increase the accuracy of the BOD test results. Signup and view all the answers

What is the function of adding potassium hydroxide pellets to the sample bottle during the BOD testing procedure?

To ensure proper sealing of the bottle. Signup and view all the answers

Why is it important to place the instrument in the incubator during the BOD testing procedure?

To maintain a constant temperature for microbial activity. Signup and view all the answers

What would be the consequence if a different sample size is chosen than what is recommended by the table during BOD testing?

The dissolved oxygen content would be inaccurate. Signup and view all the answers

How does adding nutrients (nutrient buffer pillow) to the sample aid in the BOD testing procedure?

It provides a food source for aerobic aquatic microorganisms. Signup and view all the answers