## Permeate
### Integrated Constructed Wetland MFC  
Constructed wetland (CW) treatment is a less expensive passive sewage management method. The primary cause for its limited recognition is that it has a low treatment efficacy and requires a considerable amount of land to construct. Various MFCs integrated with constructed wetlands are shown in Table 3.  
[PERSON] (2010) introduced a hybrid method that combines an MFC with a CW to improve the treatment effectiveness of the CW while reducing the required landmass. It has found wide acceptance from scientists all over the world over the last 7-8 years. Because the majority of the component in the CW is anaerobic, it has low treatment efficiency (less electron acceptor). As a result, the primary purpose of integrating the MFC into the CW is to improve the CW's treatment potential (Figure 6). However, power generation has recently been discovered to be another CW resource [80]. Figure 5: General representation of MDC-MFCs. The first experimental investigation on a CW-MFC for the elimination of dye in a vertical flow CW was carried out. The experiment found that the highest electricity output was around 69.75 mA/m\({}^{2}\), that the highest COD was 70%, and that dye degradation rate was 93.15% [80]. In the following year, [PERSON] et al. [81] tested a horizontal flow CW on various organic loading rates, achieving a COD elimination of 90-95% with the highest electricity output of 43 mA/m\({}^{2}\) and a coulombic efficiency of 0.45%. [PERSON] et al. [82] evaluated a batch and continuous vertical CW for swine contaminated water in the same year, reporting that the batch experiment eliminated 71.5% of carbon oxygen demand with an energy density of 12.83 W/m\({}^{2}\). However, in continuous mode, elimination was 76.5%, with an energy output of 9.4 mW/m\({}^{2}\). Eventually, [PERSON] et al. [83] investigated the functioning, configuration, and microbiological aspects of CW-MFCs, finding an energy density of 36 mW/m\({}^{2}\) and a prevalence of 13% to 16% _Geobacter_ in a horizontal subsurface CW with MFCs. Furthermore, CW-MFCs' power production is still modest, and CE was shown to be very inadequate [83]. Additionally, [PERSON] et al. and [PERSON] et al. [84] estimated the evolution and development of MFC integration into the CW. Research on CW-MFCs is still in development, and many fields need to be researched before they can be used more widely. However, a field-scale effort called MET lands is currently underway, with the goal of incorporating conductive material into wetlands. [PERSON] et al. [85] investigated the extraction efficiency of sulfamethoxazole (SMX), tetracycline (TC), and their common coexisting contaminants, such as COD and nitrogen, in constructed wetlands integrated with microbial fuel cells (MFC-CWs), as a function of plant, circuit operation mode, and influent antibiotic loads. The research revealed that MFC-CWs with plant and circuit connections had optimum SMX (99.70%) and TC (100%) removal performance. Furthermore, the bioelectricity output of MFC-CWs (planted) was superior to that of unplanted systems. With rising influent antibiotic concentrations, coulombic efficiencies in both planted and unplanted MFC-CWs dropped. In conclusion, MFC-CWs with plant and circuit connections have the ability to treat SMX- and TC-containing wastewater. The study was conducted by [PERSON] et al. to design a unique earthen-membrane-based two-chambered wetland cum microbial fuel cell (CW-MFC) for the removal of azo dye and other contaminants, including wastewater detoxification. The current design resembles the core of a shallow unplanted CW-MFC that runs anaerobic and aerobic cycles sequentially without mixing cathodic and anodic effluents. A synthetic effluent containing 550 mg/L initial COD and 50 mg/L methyl orange (MO) azo dye was found to have 94.04 \(\pm\) 2.87%  
Figure 6: A typical representation of constructed wetland MFCs.