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