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Abstract：
The treatment of agroindustrial wastewater using microbial fuel cells (MFCs) is a technological strategy to harness its chemical energy while simultaneously purifying the water. This manuscript investigates the organic load effect as chemical oxygen demand (COD) on the production of electricity during the treatment of cassava wastewater by means of a dual-chamber microbial fuel cell in batch mode. Additionally, specific conditions were selected to evaluate the semi-continuous operational mode. The dynamics of microbial communities on the graphite anode were also investigated. The maximum power density delivered by the batch MFC (656.4 μW m - 2 ) was achieved at the highest evaluated organic load (6.8 g COD L - 1 ). Similarly, the largest COD removal efficiency (61.9%) was reached at the lowest organic load (1.17 g COD L - 1 ). Cyanide degradation percentages (50-70%) were achieved across treatments. The semi-continuous operation of the MFC for 2 months revealed that the voltage across the cell is dependent on the supply or suspension of the organic load feed. The electrode polarization resistance was observed to decreases over time, possibly due to the enrichment of the anode with electrogenic microbial communities. A metataxonomic analysis revealed a significant increase in bacteria from the phylum Firmicutes, primarily of the genus Enterococcus.
摘要：
使用微生物燃料电池（MFC）处理农业工业废水是一种利用其化学能同时净化水的技术策略。该手稿研究了通过双室微生物燃料电池以分批模式处理木薯废水过程中化学需氧量（COD）对电力产生的有机负荷影响。此外,选择特定条件来评估半连续运行模式。还研究了石墨阳极上微生物群落的动力学。在最高评估的有机负荷（6.8gCODL-1）下，实现了批量MFC提供的最大功率密度（656.4μWm-2）。同样，在最低的有机负荷（1.17gCODL-1）下达到最大的COD去除效率（61.9％）。在整个处理中实现氰化物降解百分比(50-70%)。MFC半连续运行2个月表明，电池两端的电压取决于有机负载进料的供应或悬浮。观察到电极极化电阻随时间降低，可能是由于阳极富集了电微生物群落。代谢分析显示，Firmicutes门的细菌显着增加，主要为肠球菌属。
