Seo Yoonjoo, Kang Hyemin, Chang Sumin, Lee Yun-Yeong, Cho Kyung-Suk
a Department of Environmental Science and Engineering , Ewha Womans University , Seoul , Republic of Korea.
J Environ Sci Health A Tox Hazard Subst Environ Eng. 2018 Jan 2;53(1):13-24. doi: 10.1080/10934529.2017.1366242. Epub 2017 Oct 16.
Membrane-less, single-chamber, air-cathode, microbial fuel cells (ML-SC MFCs) have attracted attention as being suitable for wastewater treatment. In this study, the effects of nitrate and sulfate on the performance of ML-SC MFCs and their bacterial structures were evaluated. The maximum power density increased after nitrate addition from 8.6 mW·m to 14.0 mW·m, while it decreased after sulfate addition from 11.5 mW·m to 7.7 mW·m. The chemical oxygen demand removal efficiencies remained at more than 90% regardless of the nitrate or sulfate additions. The nitrate was removed completely (93.0%) in the ML-SC MFC, while the sulfate removal efficiency was relatively low (17.6%). Clostridium (23.1%), Petrimonas (20.0%), and unclassified Rhodocyclaceae (6.2%) were dominant on the anode before the addition of nitrate or sulfate. After the addition of nitrate, Clostridium was still the most dominant on the anode (23.6%), but Petrimonas significantly decreased (6.0%) and unclassified Rhodocyclaceae increased (17.1%). After the addition of sulfate, the amount of Clostridium almost doubled in the composition on the anode (43.2%), while Petrimonas decreased (5.5%). The bacterial community on the cathode was similar to that on the anode after the addition of nitrate. However, Desulfovibrio was remarkably dominant on the cathode (32.9%) after the addition of sulfate. These results promote a deeper understanding of the effects of nitrate or sulfate on the ML-SC MFCs' performance and their bacterial community.
无膜单室空气阴极微生物燃料电池（ML-SC MFCs）因其适用于废水处理而备受关注。在本研究中，评估了硝酸盐和硫酸盐对ML-SC MFCs性能及其细菌结构的影响。添加硝酸盐后，最大功率密度从8.6 mW·m²增加到14.0 mW·m²，而添加硫酸盐后，最大功率密度从11.5 mW·m²降至7.7 mW·m²。无论是否添加硝酸盐或硫酸盐，化学需氧量去除效率均保持在90%以上。ML-SC MFC中硝酸盐被完全去除（93.0%），而硫酸盐去除效率相对较低（17.6%）。在添加硝酸盐或硫酸盐之前，梭菌属（23.1%）、Petrimonas属（20.0%）和未分类的红环菌科（6.2%）在阳极上占主导地位。添加硝酸盐后，梭菌属在阳极上仍然是最主要的（23.6%），但Petrimonas属显著减少（6.0%），未分类的红环菌科增加（17.1%）。添加硫酸盐后，阳极成分中梭菌属的数量几乎翻倍（43.2%），而Petrimonas属减少（5.5%）。添加硝酸盐后，阴极上的细菌群落与阳极上的相似。然而，添加硫酸盐后，脱硫弧菌在阴极上显著占主导地位（32.9%）。这些结果有助于更深入地了解硝酸盐或硫酸盐对ML-SC MFCs性能及其细菌群落的影响。
