Stimulating soil microorganisms for mineralizing the herbicide isoproturon by means of microbial electroremediating cells
Jose Rodrigo Quejigo, Ulrike Dörfler, Reiner Schroll, Abraham Esteve‐Núñez
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What they did
- System
- MERC
What worked
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Abstract
The absence of suitable terminal electron acceptors (TEA) in soil might limit the oxidative metabolism of environmental microbial populations. Microbial electroremediating cells (MERCs) consist in a variety of bioelectrochemical devices that aim to overcome electron acceptor limitation and maximize metabolic oxidation with the purpose of enhancing the biodegradation of a pollutant in the environment. The objective of this work was to use MERCs principles for stimulating soil bacteria to achieve the complete biodegradation of the herbicide (14) C-isoproturon (IPU) to (14) CO₂ in soils. Our study concludes that using electrodes at a positive potential [+600 mV (versus Ag/AgCl)] enhanced the mineralization by 20-fold respect the electrode-free control. We also report an overall profile of the (14) C-IPU metabolites and a (14) C mass balance in response to the different treatments. The remarkable impact of electrodes on the microbial activity of natural communities suggests a promising future for this emerging environmental technology that we propose to name bioelectroventing.
Keywords
Identifiers
- PubMed
- 26880137
- Journal
- Microbial Biotechnology
- Year
- 2016