Microbial Fuel Cells in Relation to Conventional Anaerobic Digestion Technology

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<ul><li><p>Microbial Fuel Cells in Relation to Conventional AnaerobicDigestion Technology</p></li><li><p> Conventional anaerobic digestion(AD) based bioconversion processes produce biogas and have been widely applied for the production of renewable energy. An innovative technology of microbial fuel cells(MFC)is considered as a new pathway for bioconversion processes towards electricity. In comparison with conventional AD, the MFC technology holds some specific advantages, such as its applicability for the treatment of low concentration substrates at temperatures below 20oC , where AD generally fails to function. This provides some specific application niches where it does not compete with but complements the AD technology. However, microbial fuel cells still face some important limitations in terms of large-scale application. The limitations involve the investment costs, upscale technical issues and the factors limiting the performance, both in terms of anodic and cathodic electron transfer. Research to render the microbial fuel cell technology more economically feasible and applicable should focus on reactor configuration, power density and the material costs.</p></li><li><p>1 H2MFCMFCMFC20oCADMFC MFCADMFCAD</p></li><li><p>2 C6H12O6 + 6 O2 6 CO2 + 6H2O G = 2843 kJ/mol (1) 35%90% MFCCO2 Anode: C6H12O6 + 6 H2O 6 CO2 + 24H+ + 24 e Cathode: 24 H+ + 24 e + 6 O2 12 H2O Total: C6H12O6 + 6 O2 6 CO2 + 6 H2O + Electrical energy (2) (theoretically approaching 2840 kJ/mol) </p></li><li><p>Figure 1. Working principle of a microbial fuel cell [1].</p></li><li><p>3 ADMFCMFCShewanella putrefaciensPseudomonas aeruginosaMFCBacillus licheniformisMFCMFC MFC6 MFC</p></li><li><p>4 ADADADAD1/32/360-80 oC AD MFCAD1Kg COD1KWhMFC1Kg COD4KWhMFC0.5-0.7V0.1A 100V</p></li><li><p>5 UASB)UASBCOD80%68%COD30 oC MFC </p></li><li><p> MFCMFC </p></li><li><p> MFCPEMMFC MFCMFC</p></li><li><p> MFCMFC MFCMFC C</p></li><li><p>6 ADMFCADH2SH2SADCOD10AD MFCCODMFCMFCCOD20% MFCMFC1KW4000 10</p></li><li><p>7 AD1g/L,90%AD 10-20 oCCODMFCMFCCOD ADMFC</p></li><li><p>Figure 2. Operational scheme of a bioelectrochemically assisted microbial reactor</p></li><li><p> MFCMFCBODMFC MFCMFC</p></li><li><p> ADMFCAD30 oCMFCCOD MFC 1MFC 2 3 4</p></li></ul>