DHARMSINH DESAI UNIVERSITY, NADIAD
FACULTY OF TECHNOLOGY
B.TECH. SEMESTER VI [CH]
SUBJECT: ENVIRONMENTAL ENGINEERING (CH-611)
Examination
Date
: External Exam
: 03/05/2021
Seat No
Day
: ____________
: Monday
Time Duration
: 1.5 Hours
Max. Marks
: 30
INSTRUCTIONS:
1.
2.
3.
4.
5.
Answer each section in answer sheet provided by institute.
Figures to the right indicate maximum marks for that question.
The symbols used carry their usual meanings.
Assume suitable data, if required & mention them clearly.
Draw neat sketches wherever necessary.
SECTION-II
Q.2
Attempt Any FOUR from the following questions.
[12]
(a) Write a short-note on Photochemical smog.
(b) Explain Gaussian plume behavior model for point source with its limitation.
(c) Write a short-note on Screening.
(d) Derive the theoretical equation to calculate the Biological Oxygen Demand (BOD).
(e) Explain various types of inversions.
(f) Explain various source correction methods with two examples.
(g) List out the various design parameters for waste water treatment and describe any three
in brief with their uses.
Q.3
Attempt Any THREE from the following questions.
[18]
(a) Describe breakpoint chlorination curve. Compare disinfection with Chlorine, ozone and
ultraviolet rays. Discuss the factor influencing the action of Disinfectant.
(b) Explain the cyclone separator to control the air pollution with its advantages,
disadvantages & applications.
(c) Discuss purposes, types (with neat diagram) and determination of capacity for an
equalization basin.
(d) Define air pollution. Give detail classification of air pollutants. Describe properties of
particulate pollutants.
(e) A completely mixed activated sludge process is to be used to treat waste water flow of
600 m3/hr having a soluble BOD5 of 320 mg/l. The concentration of soluble BOD5
escaping treatment is 15 mg/l. Design criteria are Y= 0.5, k= 5 day-1, Kd = 0.06 day-1,
Ks = 100 mg/l and MLVSS(X) = 2000 mg/l. Define treatment efficiency, mean cell
residence time, Hydraulic retention time, volume of aeration tank and F/M ratio for
activated sludge.
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