4/4/2023 0 Comments Fieldlines mathematicacDIET improved the methane yield to 254.6 mL/g CODr, compared to the control. As a conductive material, activated carbon enriched its surface with electroactive microorganisms to induce DIET (cDIET). Herein, compared to polarized bioelectrodes, electrostatic fields that promote DIET were investigated in an anaerobic reactor with conductive materials. Conductive materials and polarized bioelectrodes are known to induce DIET for methane production but are still challenging to apply at a field scale. As the contribution of DIET increased to 80%, the methane yield increased, and the substrate residue decreased, resulting in a significant improvement in methane production.ĭirect interspecies electron transfer (DIET) is a breakthrough that can surpass the limitations of anaerobic digestion. The anaerobic digestion coupled microbial electrolysis cells with optimal electric potential selectively promotes the DIET through polarized electrodes were confirmed through microbial analysis. Whereas further increase of applied voltage 1.2 V, lessened methane production efficiency due to high-voltage inhibition and adverse effect on DIET promotion. Polarized bioelectrodes induced electrode-mediated DIET (eDIET) and biological DIET (bDIET), in addition to cDIET (conductive material-mediated DIET), improved the methane yield to 315.40 mL/g CODr with an applied voltage of 0.9 V. However, two cardinal questions are still controversial, i.e., which applied voltage value would be more recommended to enhance methane generation? and how the DIET over IIET has the upper hand in enhancing methane productivity? Herein, the influence of different applied voltages to promote biological-, conductive- and electrode-mediated DIET was investigated in MEC-AD reactors with conductive material. The utilization of biological-, electrode- and conductive material-mediated direct interspecies electron transfer (DIET) between exoelectrogenic bacteria and methanogenic archaea for enhancing methane productivity is widely reported in the literature. The electric field lines in this figure were plotted using Mathematica StreamPlot (Ref. (12) defines the separation field line at z ! þ1. (13) of the separation field line at z ! À 1 defines the positive mobile charge current I(t) in Eq. The thick electric field lines terminate on the particle at r ¼ R and h ¼ h c, where E r (r ¼ R) ¼ 0, and separate field lines that terminate on the sphere from field lines that go around the sphere. (Color online) Electric field lines for various times after a uniform z-directed electric field is turned on at t ¼ 0 around a perfectly conducting sphere of radius R surrounded by a lossless dielectric with permittivity, conductivity r ¼ 0, and free mobile positive charge with uniform positive charge density q þ and mobility l þ, and zero negative charge current such that q À l À ¼ 0.
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