Ranchi University 2010-2nd Sem B.E Environmental Engineering III B.TechRegular s, -I (Civil Engineering) - Question Paper

III B.Tech II Semester Regular Examinations, April 2010
ENVIRONMENTAL ENGINEERING-I
(Civil Engineering)
Time: three hours Max Marks: 80
ans any 5 ques.
All ques. carry equal marks
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1. (a) The populations of a town in 1950, 1960, 1970 and 1980 are 28000, 40000,
75000 and 92000 respectively. obtain the population in 2020 using Arithmetic,
Geometric and Incremental increase methods.
(b) explain the different factors affecting the Per Capita Demand of Water. [8+8]
2. explain the suitability of different surface and ground water sources for use in Mu-
nicipal and Industrial water supplies with reference to their Quality and volume.
[16]
3. (a) define the process of Coagulation with Iron salts Vs. Coagulation with
Alum, with equations.
(b) discuss how 'Optimum Coagulant Dose' is obtained on a particular day for a
Water Treatment Plant. [16]
4. (a) obtain the area of Rapid Sand Gravity Filter needed for a Town of Population
200,000 with a demand of 140 lpcd if the filter
(i) operates for 12 hours a day
(ii) is cleaned only once everyday and
(iii) is cleaned once in 48 hours. presume that it takes totally 45 minutes for
cleaning of filter.
Also obtain the approximate volume of sand needed for the filter and the water
needed cleaning the filter.
(b) Distinguish ranging from Slow Sand Gravity and Rapid Sand Gravity Filters with
reference to Rate of Filtration, volume of sand and Size of filter, Main treat-
ment process responsible, Pretreatment required, volume of water needed
for cleaning, Operation issues involved, Maintenance required, Period of
cleaning and method of cleaning, Loss of head, Efficiency of removal of bacte-
ria, efficiency of removal of turbidity, and Suitability in water supply schemes.
[16]
5. (a) elaborate the requirements of a good distribution system.
(b) Mention various methods of layouts of water distribution pipes and mention
their advantages and disadvantages. [8+8]
6. (a) discuss the importance of determination of solids in sewage. How do you
determine the suspended solids in a provided sample of waste?
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www.jntuworld.com
Code No: V3202/R07 Set No. 1
(b) What is the difference ranging from BOD and COD? A 2% solution of a sewage
sample is incubated for five days at 200 C. The depletion of oxygen was obtained
to be four ppm. Determine the BOD of the sewage. [8+8]
7. (a) What do you understand by
i. recirculation,
ii. 2 stage high rate trickling filters.
(b) provide different flow diagrams used for single stage and 2 stage trickling filters.
How do you determine the efficiency of these, using Rankin's equation? [8+8]
8. (a) Design and sketch a septic tank and soak pit for 100 people.
(b) What is the mechanism of waste treatment in an oxidation pond. [8+8]
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Earning:   Approval pending.