The sanitation resource recovery is a contemporary strategy fully in line with the concept of the circular economy. The by-products from constructed wetlands technology include treated water, nutrients, biomass and energy. The aim of the present study was to evaluate the sewage treatment and resources recovery in constructed wetlands operating in a tidal flow configuration, coupled with microbial fuel cells (MFC). The following factors were evaluated: two types of filling material (gravel #0 and #1) and two cultivated species, Pennisetum purpureum sp. (BRS capiaçu elephant grass) and Musa spp. (dwarf cavendish banana). The treatment cycle in each CW lasted a total of 8 h. An increase in the levels of dissolved oxygen was seen due to the tidal flow configuration, enabling the biochemical processes to remove contaminants and produce an electric current. Acceptable removal efficiency was seen for most monitored parameters. The mean values for the COD output concentration were 119, 109, 117 and 98 mg L^-1; removal efficiency 80%, 83%, 80% and 82%; and for wetlands with banana in gravel #1 (BG1), banana in gravel #0 (BG0), capiaçu in gravel #1 (CG1) and capiaçu in gravel #0 (CG0), respectively. The plant and type of filling material affected the performance of the CW, with the CG0 system being the most efficient in COD removal, and standing out for productivity. The plant and filling material affected energy production in the MFC, where the CG0 CW was again the most efficient, with maximum values of up to 970 mV. The results show that tidal flow CW can function with reduced cycle times and, if coupled with MFC, are able to produce energy. This study integrates high-load tidal flow CW with MFC at a pilot scale, offering combined benefits of wastewater treatment and energy generation. By using locally adapted species, the research provides valuable insights into optimising system performance and understanding the impact of tidal flow cycles, enhancing the practical application of CW with MFC in tropical regions.

Keywords: Bioelectrochemical processes; Fill and drain; Pollutant removal; Reciprocating wetlands; Resources recovery; Support medium.

© 2024. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

污水资源回收是一种与循环经济理念完全契合的现代策略。人工湿地技术产生的副产品包括处理后的水、营养物质、生物量和能源。本研究旨在评估在潮汐流配置下运行的人工湿地耦合微生物燃料电池（MFC）进行污水处理及资源回收的效果。该研究考察了两个填充材料类型（砾石#0和#1）以及两种栽培物种： Pennisetum purpureum sp. （BRS卡西亚çu象草）和 Musa spp. （矮丛香蕉）。每个CW的处理周期总共持续8小时。由于潮汐流配置，溶解氧水平上升，促进了生物化学过程去除污染物并产生电流。大多数监测参数均显示出可接受的去除效率。COD输出浓度平均值分别为119 mg L^-1、109 mg L^-1、117 mg L^-1 和 98 mg L^-1; 去除效率分别为80%、83%、80%和82%，分别对应于砾石#1中的香蕉（BG1）、砾石#0中的香蕉（BG0）、砾石#1中的象草（CG1）以及砾石#0中的象草（CG0）。植物种类和填充材料类型影响了CW的性能，其中CG0系统在COD去除方面最有效，并且生产效率最高。同时，植物种类和填充材料还影响MFC的能量产生，在这一指标上CG0 CW再次表现最优，最大值达到970 mV。研究结果表明，潮汐流配置的人工湿地可以以较短的周期时间运行，如果与MFC耦合，则能够产生能量。本研究在试点规模下将高负荷潮汐流人工湿地与MFC相结合，提供了污水处理和能源生产的综合效益。通过使用本地适应性物种，该研究为优化系统性能及理解潮汐流动循环的影响提供了宝贵见解，增强了CW与MFC在热带地区实际应用的实践意义。

关键词：生物电化学过程；填充排水；污染物去除；往复湿地；资源回收；支持介质。