Industrial Waste Treatment - December 2014

MU Civil Engineering (Semester 8)

Total marks: --
Total time: -- INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary

Attempt any four

1 (b) Write a note on Environmental Audit Report. 5 marks

1 (c) Explain the effect of following constituents on the stream.
1) Inorganic dissolved solids.
2) Suspended solids. 5 marks

1 (d) Explain alkaline chlorination used to treat chromium waste. 5 marks

1 (e) Explain oxygen sag curve. 5 marks

2 (a) Give the process of alcohol generation. What are the characteristics of the waste water from alcohol industry? What are the byproducts from this industry? 5 marks

2 (b) Draw and explain flow sheets for the treatment of effluent for disposal into
i) Public sewer
ii) Inland surface water from Dairy Industry. 5 marks

3 (a) Explain with a neat flow diagram the method of manufacturing of sugar. Give the characteristics of waste water and different by products of sugar industries. 5 marks

3 (b) List out of the modifications of the conventional aerobic biological treatment methods and explain any three. 5 marks

4 (a) What is Environmental Impact Assessment? Why EIA is done? Explain the same in the following context-
i) Screening
ii) Scoping
iii) Prediction
iv) Reporting. 5 marks

4 (b) State the importance to treat industrial waste. Explain in detail strength and volume reduction of industrial waste. 5 marks

5 (a) A city discharge 1600 lit/sec of sewage into a stream whose minimum rate of flow is 6000 lit/sec. The temperature of sewage as well as water is 20°C. The 5 day BOD at 20°C for Sewage is 200 mg/lit and that of river water is 1 mg/lit. The DO content of sewage is zero and that of the stream is 90% of the saturation DO. If the minimum DO to be maintained in the stream is 4.5 mg/lit, find out degree of sewage treatment required. Assume the de-oxygenation coefficient as 0.1 and re-oxygenation coefficient as 0.3, 5 marks

5 (b) Explain with neat flow diagram a working of a CETP. What are the situations in which it is used? 5 marks

6 (a) Explain with the help of flow sheet the manufacturing process of cotton textile. 5 marks

6 (b) Explain various methods of neutralization of acidic wastes. What are the effects of acidic wastes in general? 5 marks

Write short note any four

7 (b) UASB 5 marks

7 (c) Sampling of Industrial Waste. 5 marks

7 (d) Treatability study. 5 marks

7 (e) On-line equalization. 5 marks

7 (f) Water Act, 1974 5 marks