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EVALUATION OF THE BIOLOGICAL TREATMENT OF A REAL CONTAMINATED GROUNDWATER THROUGH REDUCTIVE DECHLORINATION BIOSTIMULATION
Yaqoubi, H., H. Yaqoubi, G. Sassetto, M. Presutti, M. Belfaquir, B. Matturro, S. Rossetti, L. Lorini, M.P. Papini, and M. Zeppilli. Frontiers in Chemical Engineering 7:1511251(2025)
Filed Under: Research
Filed Under: Research
A microcosm study assessed the effectiveness of bioaugmentation with an enriched dechlorinating consortium to remediate tetrachloroethane (TeCA), TCE, and sulphate ion in groundwater. Various conditions, including biostimulation and bioaugmentation approaches, were tested to evaluate the feasibility of biological treatment. Operating conditions facilitated the dechlorination of TCE into ETH, leading to an increase in the Dehalococcoides mccartyi population to 67% of the total bacteria, with reductive dechlorination (RD) rates up to 7 µeq/Ld. The RD performance of microcosms with real contaminated groundwater was negatively affected by the combined presence of TeCA and sulphate, indicated by a low abundance of D. mccartyi (<3%) and low RD rates (up to 0.39 µeq/Ld), suggesting that the native microbial population lacked the capacity for effective dechlorination. The principal component analysis plot highlighted distinct groupings based on microbial community across different microcosm conditions; microbial community structures dominated by D. mccartyi were associated with higher reductive dechlorination rates, while non-augmented and non-stimulated microcosms reflected distinct microbial communities dominated by non-dechlorinating taxa. In addition, RD decreased (48, 23, 22, and 14 µeq/Ld) with increasing sulphate concentrations (0, 150, 225, and 450 mgSO4 -2/L), further demonstrating the inhibitory effect of sulphate in the treated contaminated groundwater. This article is Open Access at https://www.frontiersin.org/journals/chemical-engineering/articles/10.3389/fceng.2025.1511251/full
Filed Under: Research
Filed Under: Research
A microcosm study assessed the effectiveness of bioaugmentation with an enriched dechlorinating consortium to remediate tetrachloroethane (TeCA), TCE, and sulphate ion in groundwater. Various conditions, including biostimulation and bioaugmentation approaches, were tested to evaluate the feasibility of biological treatment. Operating conditions facilitated the dechlorination of TCE into ETH, leading to an increase in the Dehalococcoides mccartyi population to 67% of the total bacteria, with reductive dechlorination (RD) rates up to 7 µeq/Ld. The RD performance of microcosms with real contaminated groundwater was negatively affected by the combined presence of TeCA and sulphate, indicated by a low abundance of D. mccartyi (<3%) and low RD rates (up to 0.39 µeq/Ld), suggesting that the native microbial population lacked the capacity for effective dechlorination. The principal component analysis plot highlighted distinct groupings based on microbial community across different microcosm conditions; microbial community structures dominated by D. mccartyi were associated with higher reductive dechlorination rates, while non-augmented and non-stimulated microcosms reflected distinct microbial communities dominated by non-dechlorinating taxa. In addition, RD decreased (48, 23, 22, and 14 µeq/Ld) with increasing sulphate concentrations (0, 150, 225, and 450 mgSO4 -2/L), further demonstrating the inhibitory effect of sulphate in the treated contaminated groundwater. This article is Open Access at https://www.frontiersin.org/journals/chemical-engineering/articles/10.33
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