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 Two
projects involved the demolition and decontamination of biofilters
in sewage treatment plant which were contaminated by liquid mercury.
Mercury was used as a seal of the centerpiece arm in biofilters
of this type constructed decades ago. The mercury leaked into the
filter media within the plant and spread along the concrete floor
and drainage channels. ENSAT recovered the liquid mercury with specialized
HEPA vacuums, removed and tested all filter media, disposed of hazardous
mercury impacted debris, and cleaned and decontaminated the remaining
structure to prepare for future reconstruction.
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