PART 3: AIR POLLUTION TREATMENT

• Diffusion

• Equilibrium

• Mass Transfer

ChE Principles involved in Absorption

Packed and Plate columns

Types of Absorption equipment

Packed columns

Absorption equipment

• Continuous operation

• most commonly used

Plate columns

Absorption equipment

• staged operations

lime-based sorbent

In wet scrubber systems, the absorption tower uses a______________ liquor that reacts with acid gases to form a wet/solid by-product 

Combustion

Conversion of organic compounds to innocuous carbon dioxide and water by rapid oxidation

• Flares

• Thermal combustors

• Catalytic combustors

What are the three rapid oxidation methods?

Complete combustion

Combination of the combustible elements and compounds of a fuel with all the oxygen that they can utilize

Incomplete combustion

May result in the generation of aldehydes, organic acids, carbon, & carbon monoxide

Blowdown recovery system

A system of flares for the combustion of excess gases

Catalytic incinerators

This is an alternative to thermal incinerators

platinum

Catalysts are metals in the __________ family that have the ability to promote combustion at low temperatures

Condensation

For effluent streams consisting of a condensable pollutant vapor and a non-condensable gas

Condensers

Collect condensable emissions discharged to the atmosphere, particularly when vapor concentration is high.

Contact condensers

Gaseous stream is brought into direct contact with a cooling medium so that the vapors condense and mix with the coolant

Surface condensers

Vapor and cooling medium are separated by a wall and this type is more commonly used