PURIFICATION EFFECT
POLLUTANTS		DRY			WET
		Lime	Sodium Bicarbonate	Activated carbon	1 Tower (pH 7.0)	2 Towers (pH 2 and 7.5)
HCI	%	98	99	-	98	99.5
SO2	%	90	95	-	95	90
HF	%	95	-	-	95	98
Hg	%	-	-	98	low	low
PCCDD+PCDF	%	-	-	99	-	-
NOx	%	-	20	-	30	30
H.M. (volatile)	%	low	low	high	50	95

overview of pros and cons of different purification procedures (jpg)