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For a colony of 10,000 persons having sewage flow rate of 200 L/capita/day, BOD of applied sewage of 300 mg/L and organic loading of 300 kg/day/hectare, the area of an oxidation pond required for treating the sewage of the colony is:
  • a)
    0.2 hectares
  • b)
    1 hectare
  • c)
    2 hectares
  • d)
    6 hectares
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
For a colony of 10,000 persons having sewage flow rate of 200 L/capita...
Design discharge of pond is (Qo) = (10000 × 200)
Qo = 2 × 106 liters/day
Organic loading rate = 300 kg/day/hectare
Applied Bod (So) = 300 mg/liter = 300 × 10-6
Area of oxidation pond required = 
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Most Upvoted Answer
For a colony of 10,000 persons having sewage flow rate of 200 L/capita...
Given Data:


  • Number of persons in the colony = 10,000

  • Sewage flow rate = 200 L/capita/day

  • BOD of applied sewage = 300 mg/L

  • Organic loading = 300 kg/day/hectare



Calculation:


Step 1: Calculate the total sewage flow rate:

Total sewage flow rate = Number of persons × Sewage flow rate per capita
Total sewage flow rate = 10,000 × 200 L/capita/day
Total sewage flow rate = 2,000,000 L/day

Step 2: Calculate the organic loading:

Organic loading = Total sewage flow rate × BOD of applied sewage
Organic loading = 2,000,000 L/day × 300 mg/L
Organic loading = 600,000,000 mg/day

Step 3: Convert organic loading to kg/day:

Organic loading = 600,000,000 mg/day = 600,000 g/day = 600 kg/day

Step 4: Calculate the area of oxidation pond:

Area of oxidation pond = Organic loading / Organic loading per hectare
Area of oxidation pond = 600 kg/day / 300 kg/day/hectare
Area of oxidation pond = 2 hectares

Therefore, the area of an oxidation pond required for treating the sewage of the colony is 2 hectares. Hence, the correct option is (c) 2 hectares.
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For a colony of 10,000 persons having sewage flow rate of 200 L/capita/day, BOD of applied sewage of 300 mg/L and organic loading of 300 kg/day/hectare, the area of an oxidation pond required for treating the sewage of the colony is:a)0.2 hectaresb)1 hectarec)2 hectaresd)6 hectaresCorrect answer is option 'C'. Can you explain this answer?
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