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Title (Primary) Electrochemical and microbial dissection of electrified biotrickling filters
Author Korth, B.; Pous, N.; Hönig, R.; Haus, P.; Borim Corrêa, F.; Nunes da Rocha, U.; Puig, S.; Harnisch, F.
Journal Frontiers in Microbiology
Year 2022
Department UMB
Volume 13
Page From art. 869474
Language englisch
Topic T7 Bioeconomy
Supplements https://ndownloader.figstatic.com/files/35471048
Keywords Microbial electrochemical technology; Biologic nitrogen removal; Denitrification; Fixed bed reactor; cyclic voltammetry; metagenomic sequencing
Abstract Electrified biotrickling filters represent sustainable microbial electrochemical technology for treating organic carbon-deficient ammonium-contaminated waters. However, information on the microbiome of the conductive granule bed cathode remained inexistent. For uncovering this black box and for identifying key process parameters, minimally invasive sampling units were introduced allowing the extraction of granules from different reactor layers during reactor operation. Sampled granules were analyzed using cyclic voltammetry and molecular-biological tools. Two main redox sites (−288±18 mV and −206±21 mV vs. SHE) related to bioelectrochemical denitrification were identified exhibiting high activity in a broad pH range (pH 6-10). A genome-centric analysis revealed a complex nitrogen food web and the presence of typical denitrifiers like Pseudomonas nitroreducens and Paracoccus versutus with none of these species being identified as electroactive microorganisms, so far. The results provide first insights into microbial structure-function-relationships within electrified biotrickling filters and underline robustness and application potential of bioelectrochemical denitrification for environmental remediation.
Persistent UFZ Identifier https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=26096
Korth, B., Pous, N., Hönig, R., Haus, P., Borim Corrêa, F., Nunes da Rocha, U., Puig, S., Harnisch, F. (2022):
Electrochemical and microbial dissection of electrified biotrickling filters
Front. Microbiol. 13 , art. 869474