This document appears to be an exam for an Environmental Engineering course, consisting of two pages with multiple choice and short answer questions. Some of the key topics covered include: - Standards for drinking water quality including limits for chlorides, fluorides, and hardness. - Objectives of protected water supplies and the principle of coagulation in water treatment. - Differences between BOD and COD testing of sewage samples. - Primary treatment of sewage and the applications of BOD testing. - Design of various water and wastewater treatment units like clarifiers, septic tanks, and slow sand filters.

1. Page 1 of 2
Subject Code
CED1121 R12
VNR VIGNANA JYOTHI INSTITUTE OF ENGINEERING AND TECHNOLOGY
(AUTONOMOUS)
B.Tech. III Year II Semester Adv. Supplementary Examinations, June/July, 2015
ENVIRONMENTAL ENGINEERING
(CE)
Time: 3Hours Max. Marks: 70M
PART- A
(Answer ALL Questions)
1. Answer in one sentence 5X1=5M
a) What is the minimum per capita demand of water as per standards
b) List intake structures
c) What is the difference between disinfection and sterilization
d) What is DWF (Dry Weather Flow)
e) What is the main difference between Standard rate and High rate trickling filters
2. Answerthe followingverybriefly. 5x2=10M
a) What is design period
b) What is the difference between quality of Ground and surface water
c) What is the difference between discrete and flocculent particle
d) What is the difference between aerobic and anaerobic decomposition
e) What are suspended growth system and Attached growth system
3. Answerthe followingbriefly. 5x3=15M
a) What are the desirable limits of Chlorides, Fluorides and Hardness of water for drinking as
per IS 10500
b) What are the objectives of protected water supplies.
c) What is the principle of Coagulation?
d) Why COD is more than BOD for a given sewage sample?
e) Write a short note on Sludge Volume Index

2. Page 2 of 2
PART- B
AnsweranyFOUR questions 4X10=40M
4. a) Estimate the population for 2031 by Arithmetical Increase and Geometrical increase
methods for the census data given below. 5M
Year: 1961 1971 1981 1991 2001 2011
Population: 1,50,000 1,80,000 2,15,000 2,55,000 2,95,000 3,45,000
b) Explain about the Water borne diseases 5M
5. a) What are the different types of pipes available for water supply system? Discuss their merits
and de merits. 5M
b) Derive an expression for determining the discharge from an Unconfined aquifer 5M
6. a) What are the methods of analysis of distribution system. Explain about the Hardy Cross
method. 5M
b) Design a circular clarifier to treat 5 MLD of water. The Over flow rate should not exceed
30,000 lt/sq.m./day. Suitable data may be assumed. 5M
7. a) What is primary treatment of sewage. Explain briefly. 5M
b) What is BOD and what are the applications of BOD. 5M
8. a) Explain the Activated sludge process with the help of a neat flow diagram 5M
b) Design a septic tank for a hostel of students 250. Assume suitable data. Show all the relevant
checks in the design. 5M
9. a) Describe the construction and working of slow sand filter with a neat sketch. 5M
b) Write short note on Loss of head, -ve head and air binding 5M
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