Engineered in situ biogeochemical transformation as a secondary treatment following ISCO - A field test
Language English Country Great Britain, England Media print-electronic
Document type Journal Article
PubMed
31374391
DOI
10.1016/j.chemosphere.2019.124460
PII: S0045-6535(19)31684-4
Knihovny.cz E-resources
- Keywords
- Biogeochemical transformation, Chlorinated solvents, Geochemical modelling, Indigenous microorganisms, Molecular tools, Solid phase analysis,
- MeSH
- Water Pollutants, Chemical analysis metabolism MeSH
- Chlorine metabolism MeSH
- Chloroflexi metabolism MeSH
- Water Purification methods MeSH
- Desulfitobacterium metabolism MeSH
- Ethylenes metabolism MeSH
- Halogenation MeSH
- Oxidation-Reduction MeSH
- Peptococcaceae metabolism MeSH
- Groundwater analysis chemistry microbiology MeSH
- Environmental Restoration and Remediation methods MeSH
- Solvents metabolism MeSH
- Sulfates metabolism MeSH
- Sodium Compounds MeSH
- Tetrachloroethylene analysis metabolism MeSH
- Trichloroethylene analysis metabolism MeSH
- Iron metabolism MeSH
- Publication type
- Journal Article MeSH
- Geographicals
- Czech Republic MeSH
- Names of Substances
- Water Pollutants, Chemical MeSH
- Chlorine MeSH
- ethylene MeSH Browser
- Ethylenes MeSH
- Solvents MeSH
- Sulfates MeSH
- Sodium Compounds MeSH
- sodium persulfate MeSH Browser
- Tetrachloroethylene MeSH
- Trichloroethylene MeSH
- Iron MeSH
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
Masaryk University Žerotínovo nám 617 9 601 77 Brno Czech Republic
Technical University of Liberec Studentská 2 461 17 Liberec Czech Republic
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