GATE Questions & Answers of Engineered systems for solid waste management (Reuse-Recycle , Energy recovery , Treatment and disposal)

What is the Weightage of Engineered systems for solid waste management (Reuse-Recycle , Energy recovery , Treatment and disposal) in GATE Exam?

Total 3 Questions have been asked from Engineered systems for solid waste management (Reuse-Recycle , Energy recovery , Treatment and disposal) topic of Municipal Solid Wastes subject in previous GATE papers. Average marks 1.67.

A city generates 40×106 kg of municipal solid waste (MSW) per year, out of which only 10% is recovered/recycled and the rest goes to landfill. The landfill has a single lift of 3 m height and is compacted to a density of 550 kg/m3. If 80% of the landfill is assumed to be MSW, the landfill area (in m2, up to one decimal place) required would be ______

The composition of a municipal solid waste sample is given below:

 

Component Percent by
Mass
Moisture Content
(%)
Energy Content
(kj/kg. on as-discarded basis)
Food Waste 20 70 2500
Paper 10 4 10000
Cardboard 10 4 8000
Plastics 10 1 14000
Garden Trimmings 40 60 3500
Wood 5 20 14000
Tin Cans 5 2 100

The diffrence between the energy content of the waste sample calculated on dry basis and as-discared basis (in kJ/kg) would be ______________

A landfill is to be designed to serve a population of 200000 for a period of 25 years. The solid waste (SW) generation is 2 kg/person/day. The density of the uncompacted SW is 100 kg/m3 and a compaction ratio of 4 is suggested. The ratio of compacted fill (i.e, SW+ cover) to compacted SW is 1.5. The landfill volume (in million m3) required is _________.