A process 1, characterized in that {HEAD ~ the waste water} is continuously passed through {TAIL ~ at least one anoxic and one aerobic treatment zone} 
is continuously passed through
A process 1 , characterized in that { HEAD ~ the waste water } is continuously passed through { TAIL ~ at least one anoxic and one aerobic treatment zone }
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL