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