After this combined treatment, {HEAD ~ the solid phase} is separated from {TAIL ~ the aqueous phase} and recovered 
After this combined treatment , { HEAD ~ the solid phase } is separated from { TAIL ~ the aqueous phase } and recovered
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH