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GATE2020 Environmental Engineering Rapid Quiz 2

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Question 1

A sewage of volume 5,000m³ containing 200mg/l of suspended solids and passed through settling tank. The solids from the tank are digested to recover methane gas (which is of 70% o the total gas produced after sludge digestion). The volatile matter that is reduced in sludge digestion is 60mg/l. Assuming 0.9m³ of gas is produced per Kg of volatile matter reduced. Find the amount of methane gas recovered by sludge digestion?

Question 2

What was the highest constituent (in terms of volume) of landfill gas (by dry volume basis)?

Question 3

A thermal power plant burns coal at the rate of 18tons/hr and discharges the flue gas through a chimney. The coal has a sulphur content of 4%. The maximum concentration of SO₂ in the flue gas at the ground level will be?

Question 4

It was decided to construct a fabric filter, using bags of 0.45 m diameter and 7.5 m long, for removing industrial stack gas containing particulates. The expected rate of airflow into the filter is 10m3/s. If the filtering velocity is 2.0 m/min, the minimum number of bags (rounded to nearest higher integer) required for continuous cleaning operation is

Question 5

Ozone is used in water with a residual of 0.8mg / lt to obtain 99.79 % kill of organisms. Find the volume of disinfection unit, for flow rate of 2500 m³/day and take reaction constant as 3.8x10^-2/min?

Question 6

A rectangular sedimentation tank is designed for a surface overflow rate (surface loading) of 15,000 liter/hour/m². The percentage of the suspended particles of diameter 0.05 mm that will be removed in the tank is ________.
[Assume Kinematic viscosity of water = 0.85 mm²/sec and specific gravity of particles = 2.60]

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ESE & GATE CE Environmental Engineering

Dec 27ESE & GATE CE