Achieving efficient anammox contribution and the enrichment of functional bacteria in partial denitrification/anammox system: Performance, microbial evolution and correlation analysis

IF 9.7 1区环境科学与生态学 Q1 AGRICULTURAL ENGINEERING Bioresource Technology Pub Date : 2024-11-09 DOI:10.1016/j.biortech.2024.131792

Zilong Hou , Wenyi Dong , Yanchen Li , Shuo Chen , Huaguang Liu , Qi Han , Zilong Zhao , Jie Liu , Liang Zhang , Hongjie Wang , Yongzhen Peng

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Abstract

The primary challenge of applying partial denitrification/anammox (PD/A) to municipal wastewater treatment lied in the enrichment of functional bacteria with a considerable autotrophic nitrogen removal performance. The results showed influent NO₃⁻-N: NH₄⁺-N, reaction time and temperature would influence anammox nitrogen removal contribution. ¹⁵N isotopic tracing technology further revealed the average anammox contribution rate was up to 94.8 %. Extending reaction time was an effective measure to improve simultaneously PD and anammox activity. Microbial community indicated partial denitrifying bacteria (Bacillus) and anammox bacteria (Candidatus Brocadia) were enriched with abundance of 27.27 % and 7.09 % at NO₃⁻-N: NH₄⁺-N of 1:1. The correlation analysis showed that NO₃⁻-N: NH₄⁺-N ratio played the positive role for Bacillus enrichment, and low temperature was favorable to the enrichment of Thauera and Candidatus Jettenia. Overall, this study demonstrated the reasonable operational strategy would strengthen anammox contribution and facilitate enrichment of functional bacteria.

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在部分反硝化/氨氧化系统中实现有效的氨氧化贡献和功能菌的富集：性能、微生物进化和相关性分析。

将部分反硝化/氨氧化（PD/A）技术应用于城市污水处理的主要挑战在于富集具有显著自养脱氮性能的功能细菌。结果表明，进水 NO3--N：NH4+-N、反应时间和温度都会影响anammox的脱氮贡献。15N 同位素示踪技术进一步表明，平均厌氧贡献率高达 94.8%。延长反应时间是同时提高 PD 和 Anammox 活性的有效措施。微生物群落表明，当 NO3-N: NH4+-N 为 1:1 时，部分反硝化细菌（芽孢杆菌）和厌氧细菌（Candidatus Brocadia）的丰度分别为 27.27 % 和 7.09 %。相关分析表明，NO3--N：NH4+-N 的比例对芽孢杆菌的富集起积极作用，而低温有利于 Thauera 和 Candidatus Jettenia 的富集。总之，这项研究表明，合理的操作策略可加强厌氧作用，促进功能菌的富集。

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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.