{HEAD ~ The water and gas delivery rates} are controlled to satisfy {TAIL ~ the following relations}: ##EQU1## wherein Q1 is the delivery of oxygenated gas in m3 /hr, 
{ HEAD ~ The water and gas delivery rates } are controlled to satisfy { TAIL ~ the following relations } : # # EQU1 # # wherein Q1 is the delivery of oxygenated gas in m3 /hr ,
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH