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GATE CE 2022: Environmental Engineering Quiz #7

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Question 1

Match list-I with list-II and select the correct answer using the codes given below the lists:

Question 2

A rectangular tank 18 m x 8 m x 4m of water depth treats 4 million litres of water per day. The detention time for tank will be ____hours.

Question 3

Calculate the plan area of a grit chamber to remove particles of diameter 0.2 mm and specific gravity is 2.7. Settling velocity of the particle is 0.017 m/s. The proportioning weir will be having a velocity of 0.3 m/sec. The maximum wastewater flow is expected to be 1200 m3/day. Assume depth of 1 m and additional length for turbulence is also considered.

Question 4

Match List I with List II and select the correct codes

Question 5

A completely mix process is designed with the following data:

Q0 = 10000 m3/d, BOD after PST = 150 mg/l, effluent BOD = 5 mg/l

Y = 0.5 kg/kg, Kd = 0.05 per day, MLSS = 3000 mg/l

Underflow concentration (Xu) = 10000 mg/l for 2° sedimentation tank, θc = 8 days. What should be the reactor volume in m3?

Question 6

The sewage is flowing at the rate of 4.7 million litres per day from a primary clarifier to a standard rate trickling filter. The BOD of the influent is 150 mg/l. The organic loading rate is 160 gm/m3/day and surface loading rate is 2000 l/m2/day. Calculate the depth of the filter in meter.
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