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What will be the BOD of the raw sewage if?
Volume of raw sewage = 10 ml
Final volume of sewage after dilution = 250 ml
Dissolved oxygen content of diluted sample at the beginning of BOD test = 5 mg/l
Dissolved oxygen content of diluted sample after 5-day incubation at 20oC = 2 mg/l
  • a)
    150 mg/l
  • b)
    80 mg/l
  • c)
    75 mg/l
  • d)
    25 mg/l
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
What will be the BOD of the raw sewage if?Volume of raw sewage = 10 ml...
Dilution ratio = 250/10 = 25
Loss of dissolved oxygen during the test = 5-2 = 3 mg/l
BOD of sewage = loss of oxygen x dilution factor = 25 x 3 = 75 mg/l
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Community Answer
What will be the BOD of the raw sewage if?Volume of raw sewage = 10 ml...
Calculation of BOD:
- Initial dissolved oxygen content (DO1) = 5 mg/l
- Final dissolved oxygen content (DO2) = 2 mg/l
- Volume of diluted sewage = 250 ml
- Volume of raw sewage = 10 ml

Formula:
BOD = (DO1 - DO2) * (Volume of diluted sewage / Volume of raw sewage)

Calculation:
BOD = (5 - 2) * (250 / 10) = 3 * 25 = 75 mg/l
Therefore, the Biological Oxygen Demand (BOD) of the raw sewage sample is 75 mg/l.
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What will be the BOD of the raw sewage if?Volume of raw sewage = 10 mlFinal volume of sewage after dilution = 250 mlDissolved oxygen content of diluted sample at the beginning of BOD test = 5 mg/lDissolved oxygen content of diluted sample after 5-day incubation at 20oC = 2 mg/la)150 mg/lb)80 mg/lc)75 mg/ld)25 mg/lCorrect answer is option 'C'. Can you explain this answer?
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What will be the BOD of the raw sewage if?Volume of raw sewage = 10 mlFinal volume of sewage after dilution = 250 mlDissolved oxygen content of diluted sample at the beginning of BOD test = 5 mg/lDissolved oxygen content of diluted sample after 5-day incubation at 20oC = 2 mg/la)150 mg/lb)80 mg/lc)75 mg/ld)25 mg/lCorrect answer is option 'C'. Can you explain this answer? for Civil Engineering (CE) 2024 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about What will be the BOD of the raw sewage if?Volume of raw sewage = 10 mlFinal volume of sewage after dilution = 250 mlDissolved oxygen content of diluted sample at the beginning of BOD test = 5 mg/lDissolved oxygen content of diluted sample after 5-day incubation at 20oC = 2 mg/la)150 mg/lb)80 mg/lc)75 mg/ld)25 mg/lCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What will be the BOD of the raw sewage if?Volume of raw sewage = 10 mlFinal volume of sewage after dilution = 250 mlDissolved oxygen content of diluted sample at the beginning of BOD test = 5 mg/lDissolved oxygen content of diluted sample after 5-day incubation at 20oC = 2 mg/la)150 mg/lb)80 mg/lc)75 mg/ld)25 mg/lCorrect answer is option 'C'. Can you explain this answer?.
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