PRIMARY AIR POLLUTION

Our Cities………….. 

Internet Task…………….  What is an air pollutant?  What is difference between primary and secondary air pollutants?  What are the major sources of air pollutants? (Remember this is chemistry!!)  What are the major health effects of primary air pollutants?  How can we reduce the production of primary air pollutants? (Remember this is chemistry!!)

Air Pollutants (a substance in sufficient concentration in the air to produce effect on humans, animals, vegetation etc…) Primary Air Pollutants Secondary Air Pollutants

Primary Air Pollutants……….  Carbon Monoxide  Nitrogen Oxides (NO x )  Sulfur Oxides (So x )  Particulates  Hydrocarbons

Carbon Monoxide  Polar Covalent Bonding  2 CO 2 (g) + O 2 (g)  2CO 2 (g)  Localizatio n  High Emission Rates

Solutions………….  Thermal Exhaust Reactor  Catalytic Converters 2 CO (g) + 2 NO (g)  2CO 2 (g) + N 2 (g)

Nitrogen Oxides (NO x )

Equations……..  Most human sources of NO x are emitted as NO N 2 (g) + O 2 (g)  2NO (g) N 2 + 2O 2 (g)  2NO 2 (g)  In the atmosphere conversion of NO to NO 2 2NO (g) + O 2  2NO 2(g)

Sulfur Oxides (Sox)  Principal sources Man made (anthropogenic)Man made (anthropogenic) Sulfur containing fossil fuelSulfur containing fossil fuel Smelting PlantsSmelting Plants Sulfuric Acid PlantsSulfuric Acid Plants  Natural Sources (Volcanic Activity) 2H 2 S (g) + 3O 2(g)  2SO 2(g) + 2H 2 O (l)2H 2 S (g) + 3O 2(g)  2SO 2(g) + 2H 2 O (l)

Controlling SOx  Converting high sulfur coal to SNG  Using low-sulfur coal  Pre-combustion method  Post Combustion Methods (wet- scrubber)

Particulates  Smoke and soot  Dust from mechanical break- up  Asbestos  Metallic particles

Homework…………..  Read Page  Page 553 Questions 1-7