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