Gujarat University 2007 B.E Civil Engineering Environmental Engineering-I - Question Paper
2/249 Candidate s Seat No
GUJARAT UNIVERSITY B.E. Sem V (Civil) Examination Environmental Engineering-!
Wednesday, 9th January, 2O08| (Time : 3 Hours
Max. Marks : 100
Instructions : (1) Attempt all questions from each section.
(2) Answer to the two sections must be written in separate answer books.
(3) Figures to the right indicate full marks.
(4) Assume suitable data if required
SECTION I
1 ( a ) Enlist the different characteristics of water and describe in detail buological charactcrisric. 17 ( b ) Describe the test for E-coli.
( c ) Write a note on common water borne diseases.
OR
1 ( a ) Why coliform bacteria are known as indicator organisms. 17 ( b ) Describe certain desirable characteristics of indicator organisms.
( c ) Describe the procedure for MPN of coilform count.
An unknown water sample is analyzed for the estimation of coiltorm organisms. Three sample portions, 1ml. 10 ml. and 100ml. are used for titration. Each ofthe.se portions is filtered through live filter membranes using the memberane filtration technique Alter incubation in each betridish, the colonies were counted. The counts were found as follows Sr. No. Sample portion Number of Colonies
1 I ml 4, 7, 8, 6, 5
2 10ml 21,25,30.35,29
3 100ml 250,301,289,370,340 What is the number of coiiform per 100ml of sample?
2 { a ) Define hardness. What is the importance of determination of hardness of water? 17 ( b) Whal is the principle of EDTA titration? How can you determine the permanent hardness of water
by EDTA method?
( c ) 50ml of a samples of water on EDTA titration with Eriochrome Black-T as; an indicator consumed 2ml. of 0.045M EDTA till end point is reached. Calculate the hardness of water Take I ml of 0.01M EDTA 1 my of CatO,
OR
2 ( a ) What is air pollution0 Slate the effects of air pollution on man and vegetation 17 ( b ) What is noise pollution? State the adverse effects of nosie. I low traffic nosie can be reduced"'
( c ) Classify air quality standards. Explain air quality act 1970.
3 Write short notes any four ; 16 ( i ) Membrane filter technique
( ii ) Alkalinity test for water
( iii ) Rural sanitation
(iv ) Comfort criteria ot ventilation and its system
( v > Importance of microbes in environment
4 ( a ) Explain 1st stage & Hnd stage BOD. How do you determine BOD? What are its limitations? 17 ( b ) Deduce the expression for 1st stage BOD.
( c ) The BOD of a sewage sample incubated for 1 day at 3CC has been found to be 120 mg/1 What will be the 5 day 2()t'C. BOD? Assume = 0.12/dav.
OR
4 ( a ) Differentiate between Aerobic process and anaerobic process. J7 ( b ) Write a nole on carbon cycle.
( c ) A 3% solulion of a sew age sample was mcrcbated for 5 days at 20C. The dcplection of oxygen was found to be 6 mg/1. Determine the BOD of the sewage.
5 ( a ) Discuss fully the processess of self purification of natural water. Explain oxygen sag curve. 17 ( b ) Explain any one method of solid waste disposal.
( c ) The domestic sewage of a town is to be dicharged into a stream after treatment. Determine the maximum permissible effluent BOD and the percentage purification requricd in the treatment plant.
Given the following particulars
( i ) Population of town r 1,00,000 (ii ) D.W.F. of sewage - 140 Ipcd.
( iii ) !iOD contribution per capita ~ 0.08 kg/day < iv ) Minimum flow of stream = 0.2 m 7s ( v ) BOD of the stram = 3 mg/1 { vi ) Max BOD of stream on d/s - 6 mg/l
OR.
5 ( a ) What is house drainage? Explain aims and principles of house drainage.
( b ) Draw the layout diagrams of treatment plants of textile and fertilizer industries?
( c ) Write a note c n characteristics of industrial waste.
6 Write short notes any four :
( i ) COD test on w'ste watci sample
( ii) Boiler feed water
(in) Orthotolidine lest
( iv ) Break point chlorination
( v ) Chloride lest on water.
|
Attachment: |
| Earning: Approval pending. |
