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Factors affecting the performance of a single-chamber microbial fuel cell-type biological oxygen demand sensor

机译：影响单室微生物燃料电池式生物需氧量传感器性能的因素

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摘要

Microbial fuel cells (MFCs) are devices that exploit microorganisms as biocatalysts to degrade organic matter or sludge present in wastewater (WW), and thereby generate electricity. We developed a simple, low-cost single-chamber microbial fuel cell (SCMFC)-type biochemical oxygen demand (BOD) sensor using carbon felt (anode) and activated sludge, and demonstrated its feasibility in the construction of a real-time BOD measurement system. Further, the effects of anodic pH and organic concentration on SCMFC performance were examined, and the correlation between BOD concentration and its response time was analyzed. Our results demonstrated that the SCMFC exhibited a stable voltage after 132 min following the addition of synthetic WW (BOD concentration: 200 mg/L). Notably, the response signal increased with an increase in BOD concentration (range: 5-200 mg/L) and was found to be directly proportional to the substrate concentration. However, at higher BOD concentrations (>120 mg/L) the response signal remained unaltered. Furthermore, we optimized the SCMFC using synthetic WW, and tested it with real WW. Upon feeding real WW, the BOD values exhibited a standard deviation from 2.08 to 8.3% when compared to the standard BOD 5 method, thus demonstrating the practical applicability of the developed system to real treatment effluents.
机译：微生物燃料电池（MFCs）是一种利用微生物作为生物催化剂来降解废水（WW）中存在的有机物或污泥，从而发电的设备。我们使用碳毡（阳极）和活性污泥开发了一种简单，低成本的单室微生物燃料电池（SCMFC）型生化需氧量（BOD）传感器，并证明了其在构建实时BOD测量中的可行性系统。此外，研究了阳极pH和有机物浓度对SCMFC性能的影响，并分析了BOD浓度与其响应时间之间的相关性。我们的结果表明，在添加合成的WW（BOD浓度：200 mg / L）后132分钟后，SCMFC表现出稳定的电压。值得注意的是，响应信号随BOD浓度（范围：5-200 mg / L）的增加而增加，并且被发现与底物浓度成正比。然而，在更高的BOD浓度（> 120 mg / L）下，响应信号保持不变。此外，我们使用合成WW优化了SCMFC，并使用真实WW对其进行了测试。与标准的BOD 5方法相比，送入实际的WW时，BOD值的标准偏差为2.08％至8.3％，从而证明了开发的系统对实际处理废水的实际适用性。

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