1. Air pollution sampling and control
K Balakrishna

2. High volume air sampler

4. Air sampling filters

5. Sampling train

6. Wind Rose Diagram

7. Air pollution control
Settling chambers

8. Settling chambers use the force of gravity to remove solid particles
Settling chambers use the force of gravity to remove solid particles. The gas stream enters a chamber where the velocity of the gas is reduced. Large particles drop out of the gas and are recollected in hoppers.

9. Cyclones

10. The general principle of inertia separation is that the particulate-laden gas is forced to change direction. As gas changes direction, the inertia of the particles causes them to continue in the original direction and be separated from the gas stream. The walls of the cyclone narrow toward the bottom of the unit, allowing the particles to be collected in a hopper. The cleaner air leaves the cyclone through the top of the chamber, flowing upward in a spiral vortex, formed within a downward moving spiral.

11. Scrubbers

12. Spray chamber

13. Baffle scrubber

14. Cyclone scrubber

15. Venturi scrubber

16. Venturi scrubber

17. Bag filter

18. Electrostatic precipitator
1. Smoke particles pick up a negative charge.
2. Smoke particles are attracted to the collecting plates.
3. Collecting plates are knocked to remove the smoke particles.

19. Pollution control by absorption

20. Pollution control by adsorption

21. Pollution control by condensation

22. Pollution control by incineration