Australian Maritime College, College of Sciences and Engineering, University of Tasmania, Launceston, 7248, Australia.
School of Engineering, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, 2109, Australia.
Chemosphere. 2021 Dec;284:131296. doi: 10.1016/j.chemosphere.2021.131296. Epub 2021 Jun 22.
A two-stage hybrid Constructed Wetland (CW) integrated with a microbial fuel cell (MFC), and microbial electrolysis cell (MEC) has been assessed for treatment performance and clogging assessment and further compared with CW. The CW-MEC was operated with applied potential to the working electrode and compared with the performance of naturally adapted redox potential of the CW-MFC system. A complex synthetic municipal wastewater was used during the study, which was composed of trace metals, organics, inorganics, and dye. The study demonstrated that providing a constant potential to the working electrode in CW-MEC has resulted in high treatment performance and reduced sludge generation. The maximum chemical oxygen demand (COD), ammonium (NH), and phosphate (PO) removal achieved during treatment by CW-MEC at 24 h hydraulic retention time was 89 ± 6%, 72 ± 6% and 93 ± 2%, respectively. ICP-MS results indicated that trace metal removals were also higher in CW-MEC than in CW alone (p < 0.05). At the end of the experiment, significant volumetric change (total volume of the microcosm) occurred in CW (1.3 L), which indicates high sludge generation, whereas it was lesser in CW-MEC (0.3 L) and in CW-MFC (0.5 L). Further, Energy Dispersive X-ray (EDX) spectroscopy results indicated low levels of metal precipitation in the CW-MEC system. Based on the Shannon diversity index, the CW-MEC was assessed to be characterised by high species richness and diversity. The observations from this study indicate that the applied potential at the working electrode has a significant impact on treatment performance and clogging behaviour of the system.
两段式混合人工湿地（CW）与微生物燃料电池（MFC）和微生物电解池（MEC）集成，用于处理性能和堵塞评估，并与 CW 进一步比较。CW-MEC 系统在工作电极上施加了外加电势，并与 CW-MFC 系统自然适应氧化还原电势的性能进行了比较。在研究中使用了复杂的综合市政废水，其由痕量金属、有机物、无机物和染料组成。该研究表明，在 CW-MEC 中向工作电极提供恒定电势可实现高处理性能和减少污泥生成。在 24 小时水力停留时间的处理过程中，CW-MEC 达到的最大化学需氧量（COD）、氨（NH）和磷酸盐（PO）去除率分别为 89±6%、72±6%和 93±2%。ICP-MS 结果表明，与单独的 CW 相比，CW-MEC 中的痕量金属去除率也更高（p<0.05）。在实验结束时，CW（1.3 L）发生了显著的体积变化（微宇宙的总体积），这表明污泥生成量很高，而 CW-MEC（0.3 L）和 CW-MFC（0.5 L）中的污泥生成量较少。此外，能量色散 X 射线（EDX）光谱结果表明 CW-MEC 系统中的金属沉淀水平较低。根据香农多样性指数，CW-MEC 被评估为具有高物种丰富度和多样性的特征。本研究的观察结果表明，工作电极上的外加电势对处理性能和系统堵塞行为有重大影响。
