Dual intermittent aerations enhance nitrogen removal via anammox in anoxic/oxic biofilm process for carbon limited wastewater treatment.

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING

Bioresource Technology Pub Date : 2025-01-17 DOI:10.1016/j.biortech.2025.132096

Deyong Li, Shijie Wang, Guoqiang Liu, Eddy Y Zeng

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引用次数: 0

Abstract

Efficient nitrogen removal after organic capture is challenging through conventional nitrification-denitrification process. Two biofilm-based anoxic/oxic reactors, with a single intermittent zone (R1) or dual intermittent zones (R2), were compared in treating carbon-limited wastewater. Intermittent aeration integrated partial nitrification-anammox (PNA), partial denitrification-anammox (PDA), and denitrification, with anammox-related pathways contributing over 75% nitrogen removal in both reactors. As nitrogen loading rate increased from 0.14 to 0.19 kg-N m^-3 day^-1, nitrogen removal efficiency in R1 dropped from 74.3% to 46.0%, while R2 maintained 76.6% removal at low HRT of 6 h. The dual intermittent aeration strategy improved nitrogen removal capacity by enhancing PNA in the first intermittent zone and reducing effluent fluctuation in the second. Anammox bacteria (Candidatus Brocadia, relative abundance: 0.95-2.48%) were enriched across all zones, supporting efficient PNA and PDA. These findings suggested that dual intermittent aeration enhanced anammox in pre-anoxic processes for carbon limited wastewater treatment.

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厌氧/好氧生物膜工艺中双间歇曝气提高厌氧氨氧化脱氮效果。

传统的硝化-反硝化工艺对有机捕集后的高效脱氮具有挑战性。比较了单间歇区（R1）和双间歇区（R2）两种基于生物膜的厌氧/氧反应器处理限碳废水的效果。间歇曝气集成了部分硝化-厌氧氨氧化（PNA）、部分反硝化-厌氧氨氧化（PDA）和反硝化，厌氧氨氧化相关途径在两个反应器中贡献了75%以上的氮去除率。随着氮负荷速率从0.14 kg-N m-3 day-1增加到0.19 kg-N m-3 day-1， R1的氮去除率从74.3%下降到46.0%，而R2在低HRT 6 h时仍保持76.6%的去除率。双间歇曝气策略通过提高第一个间歇区的PNA和减少第二个间歇区的出水波动来提高氮去除率。厌氧氨氧化菌（Candidatus Brocadia，相对丰度：0.95 ~ 2.48%）在所有区域均有富集，支持高效PNA和PDA。这些结果表明，双间歇曝气可增强限碳废水预处理过程中的厌氧氨氧化。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Bioresource Technology 工程技术-能源与燃料

CiteScore

20.80

自引率

19.30%

发文量

2013

审稿时长

12 days

期刊介绍： Bioresource Technology publishes original articles, review articles, case studies, and short communications covering the fundamentals, applications, and management of bioresource technology. The journal seeks to advance and disseminate knowledge across various areas related to biomass, biological waste treatment, bioenergy, biotransformations, bioresource systems analysis, and associated conversion or production technologies. Topics include: • Biofuels: liquid and gaseous biofuels production, modeling and economics • Bioprocesses and bioproducts: biocatalysis and fermentations • Biomass and feedstocks utilization: bioconversion of agro-industrial residues • Environmental protection: biological waste treatment • Thermochemical conversion of biomass: combustion, pyrolysis, gasification, catalysis.