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Engineered in situ biogeochemical transformation as a secondary treatment following ISCO - A field test

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NEMECEK Jan NECHANICKA Magda SPANEK Roman EICHLER František ZEMAN Josef ČERNÍK Miroslav

Rok publikování 2019
Druh Článek v odborném periodiku
Časopis / Zdroj Chemosphere
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
www https://www.sciencedirect.com/science/article/pii/S0045653519316844
Doi http://dx.doi.org/10.1016/j.chemosphere.2019.124460
Klíčová slova Chlorinated solvents; Biogeochemical transformation; Indigenous microorganisms; Molecular tools; Solid phase analysis; Geochemical modelling
Popis ISCO using activated sodium persulphate is a widely used technology for treating chlorinated solvent source zones. In sensitive areas, however, high groundwater sulphate concentrations following treatment may be a drawback. In situ biogeochemical transformation, a technology that degrades contaminants via reduced iron minerals formed by microbial activity, offers a potential solution for such sites, the bioreduction of sulphate and production of iron sulphides that abiotically degrade chlorinated ethenes acting as a secondary technology following ISCO. This study assesses this approach in the field using hydrochemical and molecular tools, solid phase analysis and geochemical modelling. Following a neutralisation and bioaugmentation, favourable conditions for iron- and sulphate-reducers were created, resulting in a remarkable increase in their relative abundance. The abundance of dechlorinating bacteria (Dehalococcoides mccartyi, Dehalobacter sp. and Desulfitobacterium spp.) remained low throughout this process. The activity of iron- and sulphate-reducers was further stimulated through application of magnetite plus starch and microiron plus starch, resulting in an increase in ferrous iron concentration (from