When {HEAD ~ this iron sulfide} is added in a large amount to treat {TAIL ~ a fly ash} or soil containing heavy metals in a high concentration, the waste thus treated has too high a water content and is hence difficult to handle thereafter 
When { HEAD ~ this iron sulfide } is added in a large amount to treat { TAIL ~ a fly ash } or soil containing heavy metals in a high concentration , the waste thus treated has too high a water content and is hence difficult to handle thereafter
OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH 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