Abstract
The iron-assisted autotrophic denitrification was plagued by passivation when introduced in surface flow constructed wetlands (SFCWs). Iron‑carbon micro-electrolysis (Fe/C-M/E) could facilitate the transfer of electrons during the utilization of iron. In this study, iron scraps coupling with activated carbon and biochar were applied to explore the effects of carbon materials on autotrophic denitrification. The results showed that TN removal rate in the SFCW with iron scraps and activated carbon (SFCW-IAC) and the SFCW with iron scraps and biochar (SFCW-IBC) were improved by 31.61% ± 8.18% and 14.09% ± 7.15%, and N2O fluxes were reduced to 2.73 and 3.12 mg m−2 d−1, respectively. The greater iron mass loss rate (0.91%) was confirmed in SFCW-IAC. Microbial community analysis reported that autotrophic denitrification and iron related genera were increased. This study proved that activated carbon was more suitable than biochar to Fe/C-M/E for denitrification enhancement and N2O emission reduction.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
