Engineering Chemistry S Datta

POLLUTION PREVENTION AND WASTE MINIMISATION 589
EXERCISES
1. Mention the harmful effects of the air pollutants: SO 2
and CO.
2. What is green-house effect? Name a few green-house gases.
3. What is the difference between aerobic and anaerobic oxidations of sewage?
4. Describe the activated sludge process for treatment of sewage.
5. What are BOD and COD? Indicate their significance in sewage treatment.
6. Write down the principles involved in the determination of BOD and COD.
7. Explain the cause of depletion of ozone layer. Why is the ozone layer important for us?
8. Write the sources of radioactive pollution. How can it be controlled?
9. Write notes on:
(i) Trickling filter method.
(ii) Electrostatic precipitator and its use.
(iii) Activated sludge process.
(iv) Acid rain.
(v) Photochemical smog.
(vi) Cyclone separator.
10. What is noise pollution? How can it be minimised?
11. What are the sources of water and soil pollution?
12. Explain (a) Pollution control can be effected by reforestation (b) BOD is the measure of pollution
of water.
13. State the measures to be taken to control:
(a) Air pollution (b) Water pollution (c) Noise pollution
(d) Soil pollution (e) Radioactive pollution.
14. Discuss the methods of municipal sewage treatment.
15. How can pollution from internal combustion engines be controlled?