| abstract |
Groundwater is contained under highly reducing conditions. The Eh value is brought down to -100 or -200 mV, at which the contaminant breaks down, probably by a hydrolysis reaction. The contaminated groundwater is fed through a trench containing a metal such as iron filings, which is effective, under strict exclusion of oxygen, and over a period of time, to lower the Eh. Alternatively, the water may be pumped through an enclosed tank containing iron, or other metal, filings or other high-surface-area form. |