You're left with a much smaller volume of willow wood than the original soil. Wood that could be then be dried to reduce its weight even more.
It could then be used as a biofuel in a fluidized bed reactor specifically created to handle such heavy metal dense fuel, as suggested in this paper.[1] Most of the heavy metals remain in the ash, the cadmium needs to be trapped in the exhaust.
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You're left with a much smaller volume of willow wood than the original soil. Wood that could be then be dried to reduce its weight even more.
It could then be used as a biofuel in a fluidized bed reactor specifically created to handle such heavy metal dense fuel, as suggested in this paper.[1] Most of the heavy metals remain in the ash, the cadmium needs to be trapped in the exhaust.