Simultaneous enhancement of treatment performance and energy recovery using pyrite as anodic filling material in constructed wetland coupled with microbial fuel cells

Bioelectrochemical systems for enhanced nitrogen removal with minimal greenhouse gas emission from carbon-deficient wastewater: A review

“…Over the last decade, progresses have been made in simultaneous BESenhanced denitrification and power production. The upper part of the arrow in the figure depicts the development of electrode materials, while the lower part of the arrow represents other strategies, including specific strain screening, filler materials, and cyclic polarization (Jin et al, 2018;Lu et al, 2011;Srinivasan et al, 2019;Wang et al, 2021a;Xu et al, 2018;Yan et al, 2012Yan et al, , 2021.…”

“…This is because the removal of organic matter by the electron-producing bacteria at the anode alone is inefficient. To extend the range of electroactivity in the anode region, inexpensive natural conductive pyrite (PyAno) can be used as a filling material (Yan et al, 2021). As a conductive mineral, pyrite is capable of long-range bio-current transmission in various environments.…”

The electrode strategy and its coordination mechanism in constructed wetland-microbial fuel cell (CW-MFC): a review

“…In CW-MFC that FeS 2 /quartz sand was combined with CF-SSM as the anode, a high voltage of 416 mV was observed and the removal rate of COD increased to 87%, which were higher than FeS 2 or quartz sand. Moreover, the cost can be reduced by 53%-90% in comparison with other conductive particles (such as AC and graphite granular), which provided an economically sustainable strategy (Yan et al 2021). The coupling of FeS 2 and s-Fe 0 was further combined with titanium mesh as the electrode in CW-MFC, showing a synergistic effect in the removal of Cr(VI) (98%), total chromium (88%), NH 4 + -N (65%), and TP (79%), and the electricity production (573 mV, 19 mW•m −2 ) was higher than FeS 2 as the conductive particle, since Fe 2+ released from iron scraps can reduce Cr(VI) into Cr(III), and EPS regulated by s-Fe 0 further accelerated the reduction of Cr(VI), while FeS 2 also enriched EAB, iron-, and chromium-reducing bacteria (Kong et al 2021).…”

Synchronous Cr(VI) Remediation and Energy Production Using Microbial Fuel Cell from a Subsurface Environment: A Review

“…Due to the different electronic supply capacities of different soils and media, the remediation performance and electricity generation capacity will be significantly different. Yan et al [84] showed that when quartz sand and pyrite were used as CW-MFC fillers, the pyrite filler with microbial activity showed a higher capacity for supplying electrons, while quartz sand anode filler could hardly give electrons. The results showed that the pyrite filler group had a better remediation ability.…”