The invention utilizes {TAIL ~ multiple sorbent injections} for {HEAD ~ the step wise reduction} in pollutants 
The invention utilizes { TAIL ~ multiple sorbent injections } for { HEAD ~ the step wise reduction } in pollutants
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH