Any freepeers know if there is technology to remediate heavy metal contaminated soil?
Yep... Working on that very solution now. :-) I began studying the problem in relation to the possibility of farmland being contaminated from nuclear fallout.
It’s usually a very expensive process to clean the soil, whether by heat treatment, chelation and/or washing. One less-expensive way around outright soil retreatment is soil management, where the goal is to prevent plant absorption of the contaminants.