{TAIL ~ The bioreactor} contains methanotrophic microorganisms which convert the organic contaminants into {HEAD ~ mainly carbon dioxide} 
{ TAIL ~ The bioreactor } contains methanotrophic microorganisms which convert the organic contaminants into { HEAD ~ mainly carbon dioxide }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD