Perchlorate is a groundwater contaminant that is highly mobile and persistent in the environment. Current research indicates that both abiotic and biotic mechanisms support removal of perchlorate from groundwater. A bench-scale treatability study showed that greater than 99% removal of perchlorate from groundwater was achieved with EHC® Reagent, promoting both abiotic and biotic treatment mechanisms.
A column was filled with a mixture of EHC (24% by mass) and sand. This column was designed to mimic a permeable reactive barrier trench filled with a mixture of the reactive material (EHC) and sand. The column was followed by two downstream attenuation microcosms, which were filled with soil, to monitor any further reduction of perchlorate that may occur down gradient of the reactive zone. A control system was also set up as described above, except no EHC was added to the column. The Results of this bench study, which ran for over three years, indicates that EHC is capable of consistently treating greater than 99% of perchlorate, while simultaneously treating chlorinated solvents.