GATE CE 2018 Set 1 — Question 63
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Environmental Engineering → Municipal Solid Waste → Composting
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Question
A waste activated sludge (WAS) is to be blended with green waste (GW). The carbon (C) and nitrogen (N) contents, per kg of WAS and GW, on dry basis are given in the table.
The ratio of WAS to GW required (up to two decimal places) to achieve a blended C:N ratio of 20:1 on dry basis is ______
| Parameter | WAS | GW |
|---|---|---|
| Carbon (g) | 54 | 360 |
| Nitrogen (g) | 10 | 6 |
Correct answer
1.6 to 1.7
Solution
Let be the mass of WAS and be the mass of GW on a dry basis.
1.Total Carbon in the blend:
2.Total Nitrogen in the blend:
We are given that the target blended C:N ratio is 20:1:Solving for the ratio :Rounding to two decimal places, the ratio of WAS to GW is 1.64.Continue learning with Success Tracker
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