The treatment in accordance with {TAIL ~ the system} starts with biologic and enzymatic treatment of the materials in {HEAD ~ the waste water stream} 
The treatment in accordance with { TAIL ~ the system } starts with biologic and enzymatic treatment of the materials in { HEAD ~ the waste water stream }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD