Publication date: 21st July 2025
The aim of this research is to systematically investigate the possibilities related with the utilizition of anaerobic digester effluent (still containing unconverted organic matter) in a bioelectrochemical stage for additional energy recovery. As a matter of fact, we have start-up mixed culture microbial fuel cells (MFC) on acetate as the sole substrate to stabilize energy production kinetics. Thereafter, under steady-state operation conditions, prefiltered anaerobic digester effluent, as a wastewater-like source of organics was employed and tested in the MFC with different concentrations to assess energy production traits according to Coulombic efficiency, peak current density and time-specific energy generation rate. By the end of the 2-3 month long experiments, comprehensive electrochemical characterization of the MFCs (e.g., CV, EIS, LSV) was carried out and taken into consideration together with anodic microbial community dynamics (based on shotgun metagenomic approach) and principal component analysis as a part of bioinformatics evaluation toolbox to elaborate on system behavior and efficiency.
This work was supported by the OTKA K 138232 research grant of the National Research, Development and Innovation Office of Hungary. The Authors are also grateful for the financial support of the project no. RRF-2.3.1-21-2022-00009, titled National Laboratory for Renewable Energy, which has been implemented with the support provided by the Recovery and Resilience Facility of the European Union within the framework of Programme Széchenyi Plan Plus.