GATE CE 2022 Set 2 — Question 26
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Environmental Engineering → Municipal Solid Waste → Waste Characteristics
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Question
In a solid waste handling facility, the moisture contents (MC) of food waste, paper waste, and glass waste were found to be , , and , respectively. Similarly, the energy contents (EC) of plastic waste, food waste, and glass waste were found to be , , and , respectively. Which of the following statement(s) is/are correct?
Correct answer
(A) MC_f MCₚ MC_g; (B) ECₚₚ EC_f EC_g
Solution
1.Moisture Content (MC): Food waste is highly organic and typically contains 60-80% moisture. Paper waste has a much lower moisture content, usually around 6%. Glass is non-porous and non-absorbent, with a negligible moisture content of about 2%. Therefore, is correct.
2.Energy Content (EC): Plastic waste () is derived from petroleum and has a very high calorific value (approx. 32,000 kJ/kg). Food waste () has a moderate energy content (approx. 4,500 kJ/kg). Glass () is an inert material and has almost no energy content (approx. 150 kJ/kg). Therefore, is correct.
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