1. CE 3231 - Introduction to Environmental Engineering and Science Readings for This Class: 5.5-5.6 O hio N orthern U niversity Introduction Chemistry, Microbiology & Material Balance Water & Air Pollution Env Risk Management Air Pollution Control Technologies As long as we burn fossil fuels, we will need treatment control technologies in order to attempt to offset the negative releases of pollution to the environment. This lecture presents and introduction to the most common air pollution control technologies.

2. Atmospheric Dispersion Modeling

3. Lecture 28 Air Pollution Control Technologies (Air Quality III)

4. Air Pollution Control Device  Topics Covered Include:  Reason for Air Pollution Control Devices  Types of Controls  Description of Common Controls

5. C(x,0) dependent on Q Air pollution control devices seek to limit Q Q = emission rate of pollutants, g/s

6. Air Pollution Control Technology 1.Precombustion 2.Combustion 3.Post Combustion http://www.energyeducation.tx.gov/

7. Air Pollution Control Technology 1.Precombustion American Coal Foundation (http://www.teachcoal.org/aboutcoal/articles/coalreserves.html) http://online.wsj.com/article/SB12 4414770220386457.html

8. Air Pollution Control Technology 1.Precombustion http://www.instituteforenergyresearch.org/states/ohio/

9. Air Pollution Control Technology 2.Combustion http://geosci.uchicago.edu/~moyer/GEOS24705/Images/CoalPowerPlant_TVA.gif Boiler Technology

10. Air Pollution Control Technology 2.Combustion.http://www.britannica.com/EBchecked/media/113942/Schematic-diagram-of-a-fluidized-bed-combustion-boiler>. Fluidized Bed Combustion - still boiling water, but feed (coal) is mixed with limestone to remove SOx during the process (90% removal of Sox). - Operates at lower temperature (~800 C) than conventional boiler and reduces NOx formation due to more efficient combustion

11. Air Pollution Control Technology 3.Post- Combustion Desulfurization Electrostatic precipitators (dry and wet) Bag house filters Cyclone collectors sulfur particulates

12. Post Combustion Desulfurization – Wet scrubbing Alkaline dissolved in water Sprayed alkali water droplets absorb sulfur Simplification: H 2 O + CaCO 3 (solid) + SO 2 (gas) → CaSO 3 (solid) + CO 2 (gas) + H + http://en.wikipedia.org/wiki/File:Flue_gas_ desulfurization_unit_EN.svg

13. Post Combustion Electrostatic Precipitator – Voltage applied across plates Attracts ions of opposite charge http://en.wikipedia.org/wiki/Electrostatic_precipitator

14. Post Combustion Bag house filter – Dry filtration of gas Air filters through fabric or other media http://www.tethis-lab.com/anima/pp-baghouse-filter.html

15. Post Combustion Cyclone – Dry filtration of gas Dust spun out of air http://www.dustcollectorscyclone.com/

16. Air Control Technologies – Even if we can remove the NOx, SOx, and particulates, we still have to worry about CO 2 http://www.metoffice.gov.uk/education/secondary/students/smog.html Clean Coal Technologies Parts 1 & 2 Air Pollution Control Devices Video