Further in accordance with {TAIL ~ this invention} the continuous primary control valve for the primary effluent removal line is manipulated by {HEAD ~ a conventional proportional integral derivative controller}, while the secondary valve is normally closed 
Further in accordance with { TAIL ~ this invention } the continuous primary control valve for the primary effluent removal line is manipulated by { HEAD ~ a conventional proportional integral derivative controller } , while the secondary valve is normally closed
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH