List of top Solid and Hazardous Waste Management Questions asked in GATE Environmental Science and Engineering

Food waste, paper waste and plastic waste have typical densities of \(280 kg/m^3\), \(80 kg/m^3\), and \(50 kg/m^3\), respectively. The mixed waste is composed of 70% food waste, 20% paper waste and 10% plastic waste. The density of the mixed waste is ______ \(kg/m^3\). (rounded off to 2 decimal places). Neglect compaction effect.

For a biodegradable waste with a chemical formula $C_{50}H_{100}O_{40}N$, the maximum theoretical methane production per ton of waste is __________kg (rounded off to 2 decimal places).
Assume 100% anaerobic conversion. Atomic weights of C-12; H-1; O-16; N-14

Two hypothetical organic waste streams A and B are mixed prior to the composting process. Waste-A has 2.16% of C and 1.20% of N. Waste-B has 19.10% of C and 0.14% of N. The quantity of Waste-B that should be mixed with per kg of Waste-A to achieve the desired C:N ratio of 25 is ________ kg (rounded off to 2 decimal places). Assume both the waste streams are completely dry.

A municipal solid waste digester generates 1000 kg of methane gas. The volume of the tank needed to store this gas at 30°C and 3 atmospheric pressure is ________ liters (an integer value).
Use R=0.082 L-atm/mole-K, Atomic weights of C=12, and H=1

As per the Hazardous Waste (Management and Handling) Rules, 2016, of India, which is/are the characteristic(s) that must be exhibited by a waste to be classified as a "characteristic" hazardous waste?

The costliest functional element in an urban centralized Municipal Solid Waste management infrastructure for a typical Indian Tier I city is ________.