OpenSSL SSL_connect: Connection reset by peer in connection to v2.sherpa.ac.uk:443 PuSH - Publication Server of Helmholtz Zentrum München: Modeling of contaminant biodegradation and compound-specific isotope fractionation in chemostats at low dilution rates.

PuSH - Publication Server of Helmholtz Zentrum München

Gharasoo, M. ; Ehrl, B. ; Cirpka, O.A.* ; Elsner, M.

Modeling of contaminant biodegradation and compound-specific isotope fractionation in chemostats at low dilution rates.

Environ. Sci. Technol. 53, 1186-1196 (2019)
Postprint DOI PMC
Open Access Green
We present a framework to model microbial transformations in chemostats and retentostats under transient or quasi-steady state conditions. The model accounts for transformation-induced isotope fractionation and mass transfer across the cell membrane. It also verifies that the isotope fractionation epsilon can be evaluated as the difference of substrate-specific isotope ratios between inflow and outflow. We explicitly considered that the dropwise feeding of substrate into the reactor at very low dilution rates leads to transient behavior of concentrations and transformation rates and use this information to validate conditions under which a quasi-steady state treatment is justified. We demonstrate the practicality of the code by modeling a chemostat experiment of atrazine degradation at low dilution/growth rates by the strain Arthrobacter aurescens TCl. Our results shed light on the interplay of processes that control biodegradation and isotope fractionation of contaminants at low (mu g/L) concentration levels. With the help of the model, an estimate of the mass-transfer coefficient of atrazine through the cell membrane was achieved (0.0025s(-1)).
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Publication type Article: Journal article
Document type Scientific Article
Corresponding Author
Keywords Reactive Transport; Bioavailability Restrictions; Carbon; Growth; Flow; Biotransformation; Transformation; Maintenance; Bacteria; Atrazine
ISSN (print) / ISBN 0013-936X
e-ISSN 1520-5851
Journal Environmental Science & Technology
Quellenangaben Volume: 53, Issue: 3, Pages: 1186-1196 Article Number: , Supplement: ,
Publisher ACS
Publishing Place Washington, DC
Non-patent literature Publications
Reviewing status Peer reviewed
Institute(s) Institute of Groundwater Ecology (IGOE)