15 Questions
What is the main purpose of the waste water treatment mentioned in the document?
To decompose organic materials using microorganisms
What are aerobic aquatic microorganisms known for in waste water treatment?
Using oxygen to decompose organic materials
What department or individual received 2 copies of the document according to the distribution record?
Document Control Room
What is the term used to describe the amount of oxygen consumed by organisms in breaking down waste?
Biochemical Oxygen Demand
How does lack of oxygen in water affect the growth of aerobic aquatic microbial organisms?
It imposes a limit on their growth
In the context of sewage treatment plants, what does BOD stand for?
Biochemical Oxygen Demand
What is the purpose of using a HACH DR/2400 Spectrophotometer in the described procedure?
To quantify biochemical oxygen demand
What range of oxygen consumption does the test method cover for the microbial metabolism of organic compounds in water?
0 to 700 mg/L
Who is responsible for supervising the testing activity and reporting results to the concerned department according to the text?
Shift in-Charge
What is the purpose of homogenizing the sample before measuring it into a graduated cylinder?
To ensure accurate measurement and representation of the sample.
Why is dilution necessary for samples with BOD values exceeding 700 mg/L?
To increase the accuracy of the BOD test results.
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.
Why is it important to place the instrument in the incubator during the BOD testing procedure?
To maintain a constant temperature for microbial activity.
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.
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.
Learn about the Biochemical Oxygen Demand (BOD) test method used to determine the amount of oxygen needed for microbial metabolism of organic compounds in water. Understand how microbial populations affect the oxygen levels in aquatic environments.
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