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