A biofilm-based 4 L two chamber microbial electrolysis cell (MEC) was continuously fed with acetate under saline conditions (35 g/L NaCl) for more than 100 days. The MEC produced a biogas highly enriched in H2 (≥90%). Both current (10.6 ± 0.2 A/m2Anode or 199.1 ± 4.0 A/m3MEC) and H2 production (201.1 ± 7.5 LH2/m2Cathode·d or 0.9 ± 0.0 m3H2/m3MEC·d) rates were highly significant when considering the saline operating conditions. A microbial analysis revealed an important enrichment in the anodic biofilm with five main bacterial groups: 44% Proteobacteria, 32% Bacteroidetes, 18% Firmicutes and 5% Spirochaetes and 1% Actinobacteria. Of special interest is the emergence within the Proteobacteria phylum of the recently described halophilic anode-respiring bacteria Geoalkalibacter (unk. species), with a relative abundance up to 14%. These results provide for the first time a noteworthy alternative for the treatment of saline effluents and continuous production of H2.
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机译：基于生物膜的4升两室微生物电解池（MEC）在盐水条件下（35 g / L NaCl）连续喂食醋酸盐超过100天。 MEC产生的沼气高度富含H2（≥90％）。考虑到盐水操作条件，当前（10.6±0.2 A / m2阳极或199.1±4.0 A / m3MEC）和H2的产生率（201.1±7.5 LH2 / m2Cathode·d或0.9±0.0 m3H2 / m3MEC·d）都非常重要。微生物分析显示，阳极生物膜中有五个主要细菌类群，其中有大量富集：变形杆菌44％，拟杆菌属32％，硬毛菌18％，螺旋螺类5％和放线菌1％。特别令人感兴趣的是最近描述的嗜盐阳极呼吸细菌Geoalkalibacter（菌种）在Proteobacteria phylum中的出现，相对丰度高达14％。这些结果首次为盐水处理和连续生产H2提供了一个值得注意的替代方案。
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