{HEAD ~ the amount} of {TAIL ~ oxidant} injected in each port is effective to reduce the content of organic matter in the stream by a predetermined amount in the primary stream, and 
of
{ HEAD ~ the amount } of { TAIL ~ oxidant } injected in each port is effective to reduce the content of organic matter in the stream by a predetermined amount in the primary stream , and
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH