Question

If the per capita water supply is \(150~\mathrm{L/day}\) and \(80\%\) becomes sewage, the sewage generated for \(10{,}000\) people is

• A. 1.0 MLD
• B. 1.2 MLD
• C. 1.5 MLD
• D. 2.0 MLD

Hint:

Sewage generated: \[ \boxed{ \text{Sewage} = 0.8\times (\text{Water Supply}) } \] (Usually \(80\%\) of water supplied becomes sewage.)

Answer 1

The Correct Option is B

Step 1: Find the total water supplied per day.
With 150 L/day per person for 10,000 people, total supply is $150 \times 10000 = 1{,}500{,}000$ L/day.
Step 2: Apply the sewage generation percentage.
Since 80 percent of water supplied returns as sewage, sewage generated is $0.8 \times 1{,}500{,}000 = 1{,}200{,}000$ L/day.
Step 3: Convert to MLD.
One million litres per day is written as 1 MLD, so $1{,}200{,}000$ L/day equals 1.2 MLD.
\[ \boxed{1.2\ \text{MLD}} \]