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POLLUTANTS
Metals
- Semi-volatile metals
- Low-volatilty metals
Heavy metals form as extremely fine particulate when a combustion gas is cooled. The key to effectively
collecting them is to utilize a highly efficient wet electrostatic precipitator. The metals can be scrubbed
similarly to the d/f described above. In addition, these metals tend to adhere to the surface of ash in the
gas stream after gas cooling. Per unit of ash mass, significantly more metals are carried on the smaller
particles than the larger particles since the smaller particles exhibit much higher specific surface area.
A device, therefore, that has the ability to capture more of the smallest particulate will collect more of
the heavy metals. For this reason wet electrostatic precipitators excel in this application.
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