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Sun, F. ; Mellage, A.* ; Wang, Z. ; Bakkour, R.* ; Griebler, C.* ; Thullner, M.* ; Cirpka, O.A.* ; Elsner, M.

Toward improved bioremediation strategies: Response of BAM-degradation activity to concentration and flow changes in an inoculated bench-scale sediment tank.

Environ. Sci. Technol. 56, 4050–4061 (2022)

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	Open Access Gold (Paid Option)

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Compound-specific isotope analysis (CSIA) can reveal mass-transfer limitations during biodegradation of organic pollutants by enabling the detection of masked isotope fractionation. Here, we applied CSIA to monitor the adaptive response of bacterial degradation in inoculated sediment to low contaminant concentrations over time. We characterized Aminobacter sp. MSH1 activity in a flow-through sediment tank in response to a transient supply of elevated 2,6-dichlorobenzamide (BAM) concentrations as a priming strategy and took advantage of an inadvertent intermittence to investigate the effect of short-term flow fluctuations. Priming and flow fluctuations yielded improved biodegradation performance and increased biodegradation capacity, as evaluated from bacterial activity and residual concentration time series. However, changes in isotope ratios in space and over time evidenced that mass transfer became increasingly limiting for degradation of BAM at low concentrations under such stimulated conditions, and that activity decreased further due to bacterial adaptation at low BAM (μg/L) levels. Isotope ratios, in conjunction with residual substrate concentrations, therefore helped identifying underlying limitations of biodegradation in such a stimulated system, offering important insight for future optimization of remediation schemes.

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Publication type Article: Journal article

Document type Scientific Article

Corresponding Author

Keywords 2,6-dichlorobenzamide (bam) ; Bioavailability ; Compound-specific Isotope Analysis (csia) ; Mass-transfer ; Priming Effect

ISSN (print) / ISBN 0013-936X

e-ISSN 1520-5851

Journal Environmental Science & Technology

Quellenangaben Volume: 56, Issue: 7, Pages: 4050–4061

Publisher ACS

Publishing Place Washington, DC

Non-patent literature Publications

Reviewing status Peer reviewed

Institute(s) Institute of Groundwater Ecology (IGOE)

Grants European Research Council