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6102353 
Journal Article 
Syntrophic interactions between H2-scavenging and anode-respiring bacteria can improve current density in microbial electrochemical cells 
Gao, Y; Ryu, H; Santo Domingo, A; Lee, HS 
2014 
Yes 
Bioresource Technology
ISSN: 0960-8524
EISSN: 1873-2976 
153 
245-253 
English 
24368273 
WOS:000331461000033 
High current density of 10.0-14.6A/m(2) and COD removal up to 96% were obtained in a microbial electrochemical cell (MEC) fed with digestate at hydraulic retention time (HRT) of 4d and 8d. Volatile fatty acids became undetectable in MEC effluent (HRT 8d), except for trivial acetate (4.16±1.86mgCOD/L). Accumulated methane only accounted for 3.42% of ΔCOD. Pyrosequencing analyses showed abundant fermenters (Kosmotoga spp.) and homoacetogens (Treponema spp.) in anolytes. In anode biofilm, propionate fermenters (Kosmotoga, and Syntrophobacter spp.), homoacetogens (Treponema spp.), and anode-respiring bacteria (ARB) (Geobacter spp. and Dysgonomonas spp.) were dominant. These results imply that syntrophic interactions among fermenters, homoacetogens and ARB would allow MECs to maintain high current density and coulombic efficiency. 
Homoacetogens; Anaerobic digester (AD); Microbial electrochemical cells (MECs); Anode-respiring bacteria (ARB); Methanogens