{HEAD ~ The lines} are coupled by {TAIL ~ pipelines}, each having a valve, installed after the solid liquid separation step for sending a liquid from the solid liquid separation step to the neutralization step in each line and after the sulfurization step for sending a liquid from the sulfurization step to the detoxification step in each line 
are coupled by
{ HEAD ~ The lines } are coupled by { TAIL ~ pipelines } , each having a valve , installed after the solid liquid separation step for sending a liquid from the solid liquid separation step to the neutralization step in each line and after the sulfurization step for sending a liquid from the sulfurization step to the detoxification step in each line
HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH