Enhanced nitrogen removal driven by S/Fe2+ cycle in a novel hybrid constructed wetland

Wang, Rongzhen; Zhang, Xinwen; Yang, Shuya; Xu, Zhenghe; Feng, Chengye; Zhao, Fangxing

doi:10.1016/j.jclepro.2023.139113

Cited by 13 publications

(1 citation statement)

References 71 publications

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“…Thiomonas, Chlorobaculum, Desulfovibrio, and Clostridium_sensu_stricto_1 were the dominant DNBs in C 0 N, C 5 N, C 10 N, and C 15 N, respectively. Among them, Thiomonas is a facultative autotrophic sulfur-oxidizing bacterium [52], which is capable of autotrophic denitrification using reduced sulfide as an electron donor in CWs lacking carbon sources [53]. In addition, a variety of genera associated with aerobic denitrification, such as Flavobacterium, Rhodanobacter, and Pseudomonas, were detected in C 0 N [47,54].…”

Section: Effect Of C/n Ratio On Microbial Community From Sfcwsmentioning

confidence: 99%

Characteristics of Greenhouse Gas Emissions from Constructed Wetlands Vegetated with Myriophyllum aquatic: The Effects of Influent C/N Ratio and Microbial Responses

Wang,

Li,

et al. 2024

Water

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This study designed surface flow constructed wetlands (SFCWs) with Myriophyllum aquaticum (M. aquaticum) to evaluate how different influent C/N ratios (0:1 (C0N), 5:1 (C5N), 10:1 (C10N), and 15:1 (C15N)) affect pollutant removal, greenhouse gas (GHG) emissions, and microbial communities. The results showed that effluent ammonia nitrogen (NH4+-N), nitrate nitrogen (NO3−-N), and total nitrogen (TN) concentrations decreased, but effluent chemical oxygen demand (COD) concentration increased with increasing influent C/N ratios. The highest removal rates of TN (73.17%) and COD (74.56%) were observed with C5N. Regarding GHG emissions, a few changes in CO2 fluxes were caused by the influent C/N ratio, whereas CH4 fluxes obviously increased with the increasing influent C/N ratio. The highest N2O emission occurred with C0N (211.03 ± 44.38 mg-N·m−2·h−1), decreasing significantly with higher C/N ratios. High-throughput sequencing revealed that different influent C/N ratios directly influenced the microbial distribution and composition related to CH4 and N2O metabolism in SFCWs. The highest abundance (46.24%) of denitrifying bacteria (DNB) was observed with C5N, which helped to achieve efficient nitrogen removal with a simultaneous reduction in N2O emissions. Methanogen abundance rose with higher C/N ratios, whereas methanotrophs peaked under C5N and C10N conditions. Additionally, the random forest model identified influent C/N ratio and Rhodopseudomonas as primary factors influencing CH4 and N2O emissions, respectively. This highlights the importance of the influent C/N ratio in regulating both pollutant removal and GHG emissions in constructed wetlands.

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