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