GATE 2025 AR — Planning – Question 18

Infrastructure, Services and Utilities · Processing and treatment of solid wastes · 1 mark · Multiple choice

Which is closest to an optimum carbon-to-nitrogen ratio for composting?

5:1
30:1
70:1
1:1

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Show answer and explanation

Correct answer: (B) 30:1

Explanation

Around 30:1 provides a useful balance between carbon energy and nitrogen needed for microbial growth, so B. Excess carbon slows decomposition through nitrogen limitation; excessive nitrogen can cause ammonia loss and odour. Exact operation varies with feedstock and conditions.

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