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Insight into enhanced adaptability of iron-carbon biofilter in treating low-carbon nitrogen mariculture wastewater for nitrogen removal and carbon reduction
Bioresource Technology ( IF 9.7 ) Pub Date : 2025-01-22 , DOI: 10.1016/j.biortech.2025.132103
Zhuangzhuang Xiang, Xi Chen, Hui Li, Baoxing Zhu, Jie Bai, Xiao Huang

Iron-carbon (Fe-C) based biofilters have shown significant advantages in treating mariculture wastewater by facilitating the mixotrophic heterotrophic nitrification-aerobic denitrification (HNAD) process. However, the effects of Fe-C materials and varying carbon-to-nitrogen (C/N) ratios on N removal and C reduction performance remain insufficiently explored. This study demonstrated that the Fe-C biofilter (R-Fe) achieved significantly higher NO3-N removal efficiency (65.1–96.0 %) compared to the control filter (−12.1–76.9 %) across all tested C/N ratios. Furthermore, the N2O emission proportion in R-Fe was reduced by 37.4–42.4 % compared to the control. Increasing the influent C/N ratio enhanced N removal efficiency while reducing the proportion of N2O emissions. This improvement correlated with enhanced electron transfer activity and an increased abundance of heterotrophic nitrifying-aerobic denitrifying bacteria (HNADB) and heterotrophic denitrifying bacteria (DNB), while the abundance of autotrophic denitrifying bacteria declined. Strong correlations were observed among microbial electron transfer activity, denitrifying microbial communities, Fe transport genes, denitrification-related functional genes, N removal efficiency, and N2O emission proportion, highlighting the critical role of electron transfer activity in microbial N removal processes.

中文翻译:


深入了解铁碳生物过滤器在处理低碳氮海水养殖废水中实现脱氮减碳的适应性



基于铁碳 (Fe-C) 的生物过滤器通过促进混合营养异养硝化-好氧反硝化 (HNAD) 过程,在处理海水养殖废水方面显示出显着优势。然而,Fe-C 材料和不同的碳氮 (C/N) 比对 N 去除和 C 还原性能的影响仍未得到充分探索。这项研究表明,在所有测试的 C/N 比率中,与对照过滤器 (-12.1-76.9%) 相比,Fe-C 生物过滤器 (R-Fe) 实现了显着更高的 NO3−-N 去除效率 (65.1-96.0 %)。此外,与对照相比,R-Fe 中的 N2O 排放比例降低了 37.4-42.4 %。提高进水 C/N 比提高了 N 去除效率,同时降低了 N2O 排放的比例。这种改善与增强的电子转移活性以及异养硝化好氧反硝化细菌 (HNADB) 和异养反硝化细菌 (DNB) 的丰度增加相关,而自养反硝化细菌的丰度下降。微生物电子转移活性、反硝化微生物群落、Fe 转运基因、反硝化相关功能基因、氮去除效率和 N2O 发射比例之间存在很强的相关性,突出了电子转移活性在微生物氮去除过程中的关键作用。
更新日期:2025-01-22
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