1. Electrochemical analysis of a microbial electrochemical snorkel in laboratory and constructed wetlands
- Author
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Rogińska, Joanna, Perdicakis, Michel, Midoux, Cédric, Bouchez, Théodore, Despas, Christelle, Liu, Liang, Tian, Jiang-Hao, Chaumont, Cédric, Jorand, Frédéric, Tournebize, Julien, Etienne, Mathieu, P. A. Jorand, Frédéric, Laboratoire de Chimie Physique et Microbiologie pour les Matériaux et l'Environnement (LCPME), Institut de Chimie du CNRS (INC)-Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Procédés biotechnologiques au service de l'environnement (UR PROSE), Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), Hydrosystèmes continentaux anthropisés : ressources, risques, restauration (UR HYCAR), and Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[SDV.BIO]Life Sciences [q-bio]/Biotechnology ,Microbial fuel cell ,Denitrification ,Bioelectric Energy Sources ,[SDV]Life Sciences [q-bio] ,020209 energy ,Biophysics ,Wetland ,02 engineering and technology ,010501 environmental sciences ,01 natural sciences ,Cathodic protection ,Water Purification ,chemistry.chemical_compound ,Nitrate ,0202 electrical engineering, electronic engineering, information engineering ,Electrochemistry ,[CHIM]Chemical Sciences ,Microbial electrochemical snorkel ,Physical and Theoretical Chemistry ,0105 earth and related environmental sciences ,geography ,geography.geographical_feature_category ,Nitrates ,[SDE.IE]Environmental Sciences/Environmental Engineering ,Bioanode ,Microbial fuel cells ,Environmental engineering ,General Medicine ,Electrochemical Techniques ,6. Clean water ,Anode ,[CHIM.THEO]Chemical Sciences/Theoretical and/or physical chemistry ,chemistry ,13. Climate action ,Wetlands ,Environmental science ,Water treatment ,Surface water ,Biocathode - Abstract
International audience; Microbial electrochemical snorkel (MES) is a short-circuited microbial fuel cell applicable to water treatment that does not produce energy but requires lower cost for its implementation. Few reports have already described its water treatment capabilities but no deeper electrochemical analysis were yet performed. We tested various materials (iron, stainless steel and porous graphite) and configurations of snorkel in order to better understand the rules that will control in a wetland the mixed potential of this self-powered system. We designed a model snorkel that was studied in laboratory and on the field. We confirmed the development of MES by identifying anodic and cathodic parts, by measuring the current between them and by analyzing microbial ecology in laboratory and field experiments. An important application is denitrification of surface water. Here we discuss the influence of nitrate on its electrochemical response and denitrification performances. Introducing nitrate caused the increase of the mixed potential of MES and of current at a potential value relatively more positive than for nitrate-reducing biocathodes described in the literature. The major criteria for promoting application of MES in artificial wetland dedicated to mitigation of non-point source nitrate pollution from agricultural water are considered.
- Published
- 2021