{HEAD ~ The SWQM process} requires {TAIL ~ a sparging reactor} to bubble flue gas, which contain CO2, from a nearby industry or solid waste plant 
requires
{ HEAD ~ The SWQM process } requires { TAIL ~ a sparging reactor } to bubble flue gas , which contain CO2 , from a nearby industry or solid waste plant
HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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