GATE 2022 CE (CE2) – Question 59

Air Pollution and Municipal Solid Wastes · Municipal solid wastes: generation, collection, transportation and management · 2 marks · Numerical answer

At a municipal waste handling facility, 30 metric ton mixture of food waste, yard waste, and paper waste was available. The moisture content of this mixture was found to be 10%. The ideal moisture content for composting this mixture is 50%. The amount of water to be added to this mixture to bring its moisture content to the ideal condition is _______metric ton. (in integer)

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Correct answer: 24

Explanation

Initial water mass is 0.10×30=3 tonnes and dry solids are 27 tonnes. Adding water leaves dry mass unchanged.

At 50% wet-basis moisture, water and dry-solid masses must both be 27 tonnes. Required addition =27−3=**24 tonnes**.