Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1021/acs.est.0c07320
Document author version
Title (Primary) Benefits of age–Improved resistance of mature electroactive biofilm anodes in anaerobic digestion
Author Dzofou Ngoumelah, D.; Harnisch, F. ORCID logo ; Kretzschmar, J.
Source Titel Environmental Science & Technology
Year 2021
Department UMB
Volume 55
Issue 12
Page From 8258
Page To 8266
Language englisch
Topic T7 Bioeconomy
Keywords bioelectrochemical systems; methanogens; alternative electron acceptors; direct interspecies electron transfer
Abstract Anaerobic digestion (AD) and microbial electrochemical technologies (MET) can be combined in manifold ways. Recent studies show negative influences of AD effluents on the performance of pre-grown Geobacter spp.-dominated biofilm anodes. In this study, it was investigated how such biofilm anodes are affected by AD effluents. Therefore, experiments using AD effluents in different concentrations (0–100%) in combination with biofilms of different ages were performed. Furthermore, the activity of methanogens was inhibited and minimized by application of 2-bromoethanesulfonate (2-BES) and microfiltration, respectively. Biofilms pre-grown for 5 weeks show higher resistance against AD effluents compared to biofilms pre-grown for only 3 weeks. Nevertheless, adaptation of biofilms to AD effluents was not successful. Biofilm activity in terms of coulombic efficiency and maximum current density (jmax) dropped by factor 32.2 ± 3.2 and 38.9 ± 8.4, respectively. The application of 2-BES and microfiltration had positive effects on the biofilm activity. The results support the assumption that methanogens or further compounds not studied here, for example, protozoans, which may have been inhibited or removed by 2-BES application or microfiltration, have an immediate influence on the stability of Geobacter spp.-dominated biofilms and may limit their practical application in AD environments.
Persistent UFZ Identifier
Dzofou Ngoumelah, D., Harnisch, F., Kretzschmar, J. (2021):
Benefits of age–Improved resistance of mature electroactive biofilm anodes in anaerobic digestion
Environ. Sci. Technol. 55 (12), 8258 - 8266 10.1021/acs.est.0c07320