GTU previous question papers -BE- Sem-Vth -Environmental Engineering- MAY/JUNE – 2012

GTU previous question papers



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

of wastewater.

  (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 &

pulp industry.

  (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.


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