Subject Code CED1121 R12

VNR VIGNANA JYOTHI INSTITUTE OF ENGINEERING AND TECHNOLOGY(AUTONOMOUS)

B.Tech. III Year II Semester Adv. Supplementary Examinations, June/July, 2015ENVIRONMENTAL 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 standardsb) List intake structures c) What is the difference between disinfection and sterilizationd) What is DWF (Dry Weather Flow)e) What is the main difference between Standard rate and High rate trickling filters

2. Answer the following very briefly. 5x2=10M

a) What is design periodb) What is the difference between quality of Ground and surface waterc) What is the difference between discrete and flocculent particled) What is the difference between aerobic and anaerobic decompositione) What are suspended growth system and Attached growth system

3. Answer the following briefly. 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

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PART- BAnswer any FOUR 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. 5Mb) 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. 5Mb) 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. 5Mb) 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 5Mb) 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. 5Mb) Write short note on Loss of head, -ve head and air binding 5M

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