Fermer menu Search

Chemical reduction: Feasibility assays

Assessment of the feasibility of a chemical reduction treatment of groundwater or soil polluted by organic compounds...

ENOVEO performs chemical reduction assays under laboratory conditions. These assays are designed to assess the feasibility of a chemical reduction by treating groundwater or soil polluted by organic compounds. They are carried out mainly for the reduction of chlorinated solvents, but can be applied to other compounds such as nitro compounds, chlorobenzenes, pesticides or explosives.

The principle of the tests relies on the addition of compounds having a strong reducing power (e.g., zero valent iron (ZVI) with or without an additional organic carbon source). The iron added reacts quickly though a chemical reduction mechanism with the pollutants and is oxidized to ferric iron. Since iron particle sizes may have an impact on the performance of the treatment, the use of micro- or nano- valent iron can be evaluated.

The addition of an organic substrate promotes the consumption of dissolved oxygen and other electron acceptors through the development and activity of the microbial biomass. The combination of these approaches enables the concomitant abiotic and biotic reduction of the contaminants present.

Under batch or dynamic conditions (columns), reduction tests, performed on matrices sampled on site, is used to asses treatment feasibility and efficiency under laboratory conditions and helps design the treatment to implement at the site.