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Tracing the electron transfer behavior driven by hydrophyte-derived carbon materials empowered autotrophic denitrification in iron-based constructed wetlands: Efficacy and enhancement mechanism
Water Research ( IF 11.4 ) Pub Date : 2025-01-21 , DOI: 10.1016/j.watres.2025.123169
Yuanyuan Fan, Shanshan Sun, Xushun Gu, Pan Yan, Yu Zhang, Yuanjun Peng, Shengbing He

Iron-based constructed wetlands (ICWs) displayed great potential in deep nitrogen elimination for low-polluted wastewater. However, the unsatisfactory denitrification performance caused by the limited solubility and sluggish activity of iron substrates needs to be improved in an eco-effective manner. To fill this gap, the bioavailability of iron substrates (iron scraps) affected by wetland biomass-derived carbon materials with potential conductivity were explored. Results indicated that the cumulative removal of TN in biochar-added ICW (BC-ICW) and activated carbon-added ICW (AC-ICW) increased by 29.04 % and 22.96 %, respectively. The carbon matrix of AC played the geo-conductor role to facilitate the rapid release of iron ions, as indicated by the higher TN removal efficiency of AC-ICW (45.36 ± 1.45 %) at the early stage, while the reduced conductivity of AC negatively impacted the nitrogen removal. BC-ICW exhibited intensified denitrification potential, with higher TN removal capacity (52.08 ± 3.04 %) and effluent Fe2+ concentration. Electroactive bacteria (EB) (Geobacter, Desulfovibrio, Shewanella, etc.) associated with extracellular electron transfer were enriched in BC-ICW, as well as the expanded niches breadth and improved microbial community diversity. The electron-shuttling effect of BC was mainly attributed to its oxygenated functional groups (quinone/phenolic moieties), which supported the electron transfer from EB to extracellular iron oxides, as evidenced by the increased Fe(III)(hydro)oxides bioavailability. Besides, biochar concurrently up-regulated the gene expression of electron transport chains/mediators and denitrification reductases, suggesting that BC boosted the active iron cycle and iron-mediated autotrophic denitrification in ICWs by accelerating intracellular and extracellular electron transfer. This work explored the electron transfer behavior of biomass-derived carbon materials coupled with ICWs to enhance denitrification, providing insights into the sustainable application of biomass derived carbon-assisted ICWs in tertiary treatment.

中文翻译:


追踪铁基人工湿地中水生植物衍生碳材料驱动的自养反硝化驱动的电子传递行为:功效和增强机制



铁基人工湿地 (ICW) 在深度除氮以降低污染废水方面显示出巨大潜力。然而,由于铁基材的溶解度有限和活性缓慢而导致的脱硝性能不理想,需要以生态有效的方式进行改善。为了填补这一空白,研究了受湿地生物质衍生的碳材料影响的具有潜在导电性的铁基材(铁屑)的生物利用度。结果表明,添加生物炭的 ICW (BC-ICW) 和添加活性炭的 ICW (AC-ICW) 中 TN 的累积去除率分别增加了 29.04 % 和 22.96 %。AC 的碳基体起到了促进铁离子快速释放的地导体作用,AC-ICW 早期的 TN 去除效率较高(45.36 ± 1.45 %),而 AC 的电导率降低对氮去除产生了负面影响。BC-ICW 表现出增强的反硝化潜力,具有更高的 TN 去除能力 (52.08 ± 3.04 %) 和出水 Fe2+ 浓度。与细胞外电子转移相关的电活性细菌 (EB) (Geobacter, Desulfovibrio, Shewanella 等) 在 BC-ICW 中富集,以及扩大的生态位宽度和改进的微生物群落多样性。BC 的电子穿梭效应主要归因于其含氧官能团(醌/酚基团),它支持电子从 EB 转移到细胞外氧化铁,Fe(III)(氢)氧化物生物利用度增加证明了这一点。 此外,生物炭同时上调电子传递链/介质和反硝化还原酶的基因表达,表明 BC 通过加速细胞内和细胞外电子转移促进了 ICWs 中的活性铁循环和铁介导的自养反硝化。这项工作探讨了生物质衍生碳材料与 ICWs 耦合增强反硝化作用的电子转移行为,为生物质衍生碳辅助 ICWs 在三级处理中的可持续应用提供了见解。
更新日期:2025-01-21
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