基于MFC的生物传感器用于人工湿地生活污水评估COD
MFC-based biosensor for domestic wastewater COD assessment in constructed wetlands
摘要：
在基于自然的废水处理技术（如人工湿地- CW）的背景下，使用低成本，连续的生物传感器工具来评估操作条件对于工厂管理优化至关重要。本研究的目的是评估人工湿地微生物燃料电池（CW-MFC）作为生活污水COD评估工具的潜在用途。为了这项工作的目的，建立了四个实验室规模的CW-MFC，并以不同COD浓度的预沉降生活污水进料。在实验室条件下，测试了两种不同的阳极材料（石墨棒和砾石）。此外，还进行了基于中试工厂的实验，以确认先前记录的实验室规模实验的结果。结果表明，尽管记录的库仑效率较低，但砾石或石墨基阳极适用于生活污水COD评估的目的。当接触时间大于10 h时，进水COD浓度与CW-MFC的Ecell之间存在显著的线性关系。结果还表明，CW-MFC的准确性在几周的操作后大大降低。中试实验表明，CW-MFC在运行的第3周和第7周之间呈现出良好的生物指示响应（分别相当于100和200 g COD/m2之间的累积有机负荷）。这项工作的主要结论是，CW-MFC可以作为一个“报警工具”定性连续进水水质评估，而不是一个精确的COD评估工具，由于精度损失后，几个星期的操作。
英文摘要：
In the context of natural-based wastewater treatment technologies (such as constructed wetlands - CW) the use of a low-cost, continuous-like biosensor tool for the assessment of operational conditions is of key importance for plant management optimization. The objective of the present study was to assess the potential use of constructed wetland microbial fuel cells (CW-MFC) as a domestic wastewater COD assessment tool. For the purpose of this work four lab-scale CW-MFCs were set up and fed with pre-settled domestic wastewater at different COD concentrations. Under laboratory conditions two different anodic materials were tested (graphite rods and gravel). Furthermore, a pilot-plant based experiment was also conducted to confirm the findings previously recorded for lab-scale experiments. Results showed that in spite of the low coulombic efficiencies recorded, either gravel or graphite-based anodes were suitable for the purposes of domestic wastewater COD assessment. Significant linear relationships could be established between inlet COD concentrations and CW-MFC Ecell whenever contact time was above 10 hours. Results also showed that the accuracy of the CW-MFC was greatly compromised after several weeks of operation. Pilot experiments showed that CW-MFC presents a good bio-indication response between week 3 and 7 of operation (equivalent to an accumulated organic loading between 100 and 200 g COD/m2, respectively). Main conclusion of this work is that of CW-MFC could be used as an "alarm-tool" for qualitative continuous influent water quality assessment rather than a precise COD assessment tool due to a loss of precision after several weeks of operation.
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