GTU previous question papers
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- Vth SEMESTER–EXAMINATION – MAY/JUNE – 2012
Subject code: 150603
Subject Name: Environmental Engineering
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
Q.1 (a) Differentiate between: (i) BOD & COD
(ii)Aerobic & anaerobic decompositions
(b) If the 5 day BOD at 200 C temperature of a waste water sample
is found to be 160 mg/l, find 2 day BOD at 300 C temperature
of the same sample. Assume KD (20) = 0.1/day.
Q.2 (a) Classify the solid waste and describe in detail mechanical composting method.
(b) Explain how nitrogen compounds can help in understanding
the type and state of organic matters present in the water.
(b) Explain the term Population Equivalent. Discuss the various
purposes of determining it.
Q.3 (a) State and explain the characteristics of waste from a paper &
(b) State the different components of house drainage system and
describe any two of them in detail.
Q.3 (a) What is air pollution? Explain in detail its effects on property and materials.
(b) What is noise pollution? State the sources of it and list the
major effects of the noise pollution.
Q.4 (a) State the role of microbes in the environment. Write a note on
the membrane filter technique of water.
(b) What control measures should be taken to prevent the outbreak
of water borne diseases?
Q.4 (a) Explain the term `Alkalinity` of water sample. Describe the
Laboratory procedure for the measurement of it.
(b) (i)What are the applications of Alkalinity data in
Environmental Engineering practices?
(ii) A water sample had a caustic alkalinity (OH-) of 75 mg/l,
total alkalinity 250 mg/l and total hardness of 320 mg/l all as
CaCO3. Calculate the various forms of alkalinity present and
the amounts of non-carbonic hardness, if any in this sample.
Also guess the pH value of this sample.
Q.5 (a) Discuss briefly the process of self purification of natural
receiving water. Explain the Oxygen Sag curve with sketch.
(b) The domestic sewage of a town is to be discharged into a
stream after treatment. Determine the maximum permissible
effluent BOD of the waste and the degree of treatment required
in the treatment plant. Given the following data:
(i) Population of town = 1, 00,000.
(ii) D.W.F. Of sewage = 160 lit/capita/day.
(iii) BOD contribution per capita = 0. 5 kg/day.
(iv) Minimum flow of stream = 0.25 m3/s.
(v) BOD of stream = 3 mg/l.
(vi) Maximum BOD of stream at d/s = 6 mg/l.
Q.5 Write Short Notes (Any Four):
(i) MPN test.
(ii) Relative Stability of waste water.
(iii) Sewage sickness.
(iv) Phosphorous cycle of decomposition.
(v) Environmental Audit.