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Angelov, Bratkova, Ivanov, Velichkova
This study integrates algae-assisted bioelectrochemical systems (BES) with anaerobic digestion of ethanol stillage to simultaneously achieve biomethanation, ammonium removal, and sulfide oxidation. A two-chamber system combines oxygenic photosynthesis in the cathode (with Scenedesmus sp.) and anaerobic biomethanation in the anode. Three BES operating modes—MFC, MEC (0.6V), and MEC (0.9V)—were evaluated over 80 days at 10-day contact time. MEC at 0.9V achieved optimal performance: 76.5% ammonium removal, 100% H₂S elimination, 89.5% COD reduction, and 72–75% CH₄ content in biogas.
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In a two-section bioelectrochemical system (BES), the processes of biomethanation of ethanol stillage in the anode zone and oxygenic photosynthesis in the cathodic zone are combined.There is a reduction of ammonium ions and removal of H2S in the anode zone, and at the same time, there is a positive impact on the process of biomethanation from ethanol stillage in parallel to the anode anaerobic bioreactor.Chemical oxygen demand (COD) reductions ranging from 71.2% to 89.5% were achieved in the 3 BES operating modes studied.The dynamics of the main technological parameters in the bioanode and biocathode area of the BES during continuous operation of the anaerobic bioreactor and photobioreactor (PBR) at a contact time of 10 days is established.Depending on the selected variant of operation of BES -microbial fuel cell (MFC), microbial electrolysis cell (MEC) with 0.6V and 0.9V, a decrease in the ammonium concentration is found to varying degrees, as in the MEC mode with an external electrical voltage of 0.9V the highest degree of 76.5% is reached.At the same time, complete removal of H2S is found, in the liquid and gas phases in MEC -mode and partially (78 -84 %) in MFC -mode.The influence of the photosynthetic phases on the electrochemical parameters of MFC was also investigated, with maximum values for power and current densities of 29 W/m 2 and 115 mA/m 2 , respectively.