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Test: Sewage Treatment - 2 - Civil Engineering (CE) MCQ


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10 Questions MCQ Test Topicwise Question Bank for Civil Engineering - Test: Sewage Treatment - 2

Test: Sewage Treatment - 2 for Civil Engineering (CE) 2024 is part of Topicwise Question Bank for Civil Engineering preparation. The Test: Sewage Treatment - 2 questions and answers have been prepared according to the Civil Engineering (CE) exam syllabus.The Test: Sewage Treatment - 2 MCQs are made for Civil Engineering (CE) 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Sewage Treatment - 2 below.
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Test: Sewage Treatment - 2 - Question 1

The total volume of a primary settling tank is 2500 m3 and the waste water flow is 25 x 106 litres per day. The detention time in settling tank is

Detailed Solution for Test: Sewage Treatment - 2 - Question 1

Detention time, t =  V/Q

Test: Sewage Treatment - 2 - Question 2

Acceptable lower limit of bacteria removal through activated sludge process is

Detailed Solution for Test: Sewage Treatment - 2 - Question 2

Bacteria and organisms are removed by mechanical means during waste water treatment.

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Test: Sewage Treatment - 2 - Question 3

Match List-I (Treatment process) with List-ll (Classification) and select the correct answer using the codes given below the lists:

Codes:

Test: Sewage Treatment - 2 - Question 4

If the efficiencies of BOD removal of first-stage and second-stage trickling filters are each 65,0%, then what is the overall BOD removal efficiency of these filters?

Detailed Solution for Test: Sewage Treatment - 2 - Question 4

Overall BOD removal efficiency
= 65 + (100 - 65) x (65/100)
= 65 + 22.75 = 87.75%

Test: Sewage Treatment - 2 - Question 5

A septic tank of 7 m3 in volume serves for 5 people. If the rate of accumulation of sludge is 70 litres per capita per year and sludge is removed when it occupies 50% of its volume, what is the cleaning interval of septic tank? 

Detailed Solution for Test: Sewage Treatment - 2 - Question 5

The volume of sludge at the time of cleaning
= 0.5x7 = 3.5 m3
= 3500 litres
Rate of accumulation of sludge
= 5 x 70 = 350 litre/year
Cleaning interval = 3500/350 = 10 years

Test: Sewage Treatment - 2 - Question 6

Where does sloughing occur?

Detailed Solution for Test: Sewage Treatment - 2 - Question 6

With continuous growth of microbes on the surface of filte ring media, the inner layer organisms die due to deficiency of food and loose contact with the surface of media. The shearing stress of flowing sewage remove these layers of organisms. This is called sloughing in trickling filters.

Test: Sewage Treatment - 2 - Question 7

The maximum efficiency of BOD removal is achieved in which of the following?

Test: Sewage Treatment - 2 - Question 8

What does the biological layer sticking to the trickling filter consist of?

Test: Sewage Treatment - 2 - Question 9

What is the most generally adopted detention period (approximately) for a septic tank under the Indian conditions?

Test: Sewage Treatment - 2 - Question 10

Which one of the following describes the short- circuiting occurring in a sedimentation tank?

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