当前位置:
X-MOL 学术
›
Water Res.
›
论文详情
Our official English website, www.x-mol.net, welcomes your
feedback! (Note: you will need to create a separate account there.)
Enhanced Nitrogen Removal from Low C/N Municipal Wastewater in a Step-Feed Integrated Fixed-Film Activated Sludge System: Synergizing Anammox and Partial Denitrification with Sludge Fermentation Liquid Supplementation
Water Research ( IF 11.4 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.watres.2025.123211
Yiyuan Xing, Wenjie Li, Xiaojian Liao, Lu Wang, Bo Wang, Yongzhen Peng
Water Research ( IF 11.4 ) Pub Date : 2025-01-28 , DOI: 10.1016/j.watres.2025.123211
Yiyuan Xing, Wenjie Li, Xiaojian Liao, Lu Wang, Bo Wang, Yongzhen Peng
The scarcity of rapidly biodegradable organics, which serve as essential electron donors for the partial denitrification (PD) process, significantly hinders the combined application of PD coupled with anammox (PDA) in municipal wastewater treatment plants. This study innovatively applied, for the first time, a step-feed strategy combined with the use of sludge fermentation liquid (SFL) as an external carbon source in an integrated fixed-film activated sludge (IFAS) system, successfully driving full nitrification and PDA to achieve advanced nitrogen removal from low C/N real municipal wastewater. Moreover, the associated nitrogen removal mechanism of this system was systematically analyzed. By employing second-step SFL feed as a supplementary carbon source, the nitrogen removal efficiency reached 92.26 ± 2.77% and the effluent total inorganic nitrogen was 6.43 ± 2.23 mg/L, with anammox contributing approximately 70% to total inorganic nitrogen removal. 16S rRNA gene sequencing and fluorescence in situ hybridization analysis unveiled the extensive cooperation and synergistic interactions among anammox bacteria, denitrifying bacteria, and nitrifying bacteria, with Candidatus Brocadia being highly enriched in biofilms with a relative abundance of 2.21%. Metagenomic sequencing confirmed that the relative abundance of the narGHI gene was greater than that of the nirS gene, providing stable nitrite accumulation conditions for the anammox process. Overall, this study proposes an innovative synergistic treatment scheme that utilizes a step-feed full nitrification-PDA process driven by SFL to achieve advanced nitrogen removal in municipal wastewater treatment plants. This approach is characterized by low energy consumption, low operational costs and a high nitrogen removal efficiency.
中文翻译:
在分步进料集成固定膜活性污泥系统中增强低 C/N 城市污水中的氮去除:协同厌氧氨氧化和部分反硝化与污泥发酵液体补充
可快速生物降解的有机物是部分反硝化 (PD) 过程的重要电子供体,其稀缺性严重阻碍了 PD 与厌氧氨氧化 (PDA) 在城市污水处理厂中的联合应用。本研究创新性地首次在集成固定膜活性污泥 (IFAS) 系统中应用了阶梯进料策略,并使用污泥发酵液 (SFL) 作为外部碳源,成功驱动完全硝化和 PDA,实现了从低 C/N 真实城市污水中的高级脱氮。此外,系统分析了该系统的相关脱氮机理。采用第二步 SFL 进料作为补充碳源,脱氮效率达到 92.26 ± 2.77%,出水总无机氮为 6.43 ± 2.23 mg/L,其中厌氧氨氧化对总无机氮脱氮的贡献约为 70%。16S rRNA 基因测序和荧光原位杂交分析揭示了厌氧氨氧化菌、反硝化细菌和硝化细菌之间的广泛合作和协同相互作用,Candidatus Brocadia 在生物膜中高度富集,相对丰度为 2.21%。宏基因组测序证实,narGHI 基因的相对丰度大于 nirS 基因,为厌氧氨氧化过程提供了稳定的亚硝酸盐积累条件。总体而言,本研究提出了一种创新的协同处理方案,利用由 SFL 驱动的阶梯进料全硝化 PDA 工艺在城市污水处理厂中实现先进的脱氮。 这种方法的特点是能耗低、运营成本低、脱氮效率高。
更新日期:2025-01-28
中文翻译:
在分步进料集成固定膜活性污泥系统中增强低 C/N 城市污水中的氮去除:协同厌氧氨氧化和部分反硝化与污泥发酵液体补充
可快速生物降解的有机物是部分反硝化 (PD) 过程的重要电子供体,其稀缺性严重阻碍了 PD 与厌氧氨氧化 (PDA) 在城市污水处理厂中的联合应用。本研究创新性地首次在集成固定膜活性污泥 (IFAS) 系统中应用了阶梯进料策略,并使用污泥发酵液 (SFL) 作为外部碳源,成功驱动完全硝化和 PDA,实现了从低 C/N 真实城市污水中的高级脱氮。此外,系统分析了该系统的相关脱氮机理。采用第二步 SFL 进料作为补充碳源,脱氮效率达到 92.26 ± 2.77%,出水总无机氮为 6.43 ± 2.23 mg/L,其中厌氧氨氧化对总无机氮脱氮的贡献约为 70%。16S rRNA 基因测序和荧光原位杂交分析揭示了厌氧氨氧化菌、反硝化细菌和硝化细菌之间的广泛合作和协同相互作用,Candidatus Brocadia 在生物膜中高度富集,相对丰度为 2.21%。宏基因组测序证实,narGHI 基因的相对丰度大于 nirS 基因,为厌氧氨氧化过程提供了稳定的亚硝酸盐积累条件。总体而言,本研究提出了一种创新的协同处理方案,利用由 SFL 驱动的阶梯进料全硝化 PDA 工艺在城市污水处理厂中实现先进的脱氮。 这种方法的特点是能耗低、运营成本低、脱氮效率高。