Coordination of elemental sulfur and organic carbon source stimulates simultaneous nitrification and denitrification toward low C/N ratio wastewater

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

Bioresource Technology Pub Date : 2024-07-04 DOI:10.1016/j.biortech.2024.131069

Chengji Zhang, Hong Chen, Gang Xue

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Abstract

The feasibility of inducing simultaneous nitrification and denitrification (SND) by S⁰ for low carbon to nitrogen (C/N) ratio wastewater remediation was investigated. Compared with S⁰ and/or organics absent systems (−3.4 %∼5.0 %), the higher nitrogen removal performance (18.2 %∼59.8 %) was achieved with C/N ratios and S⁰ dosages increasing when S⁰ and organics added simultaneously. The synergistic effect of S⁰ and organics stimulated extracellular polymeric substances secretion and weakened intermolecular binding force of S⁰, facilitating S⁰ bio-utilization and reducing the external organics requirement. It also promoted microbial metabolism (0.16 ∼ 0.24 μg O₂/(g VSS·h)) and ammonia assimilation (5.9 %∼20.5 %), thereby enhancing the capture of organics and providing more electron donors for SND. Furthermore, aerobic denitrifiers (15.91 %∼27.45 %) and aerobic denitrifying (napA and nirS) and ammonia assimilating genes were accumulated by this synergistic effect. This study revealed the mechanism of SND induced by coordination of S⁰ and organics and provided an innovative strategy for triggering efficient and stable SND.

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元素硫和有机碳源的配合可同时促进低碳氮比废水的硝化和反硝化。

研究了利用 S0 诱导同时硝化和反硝化（SND）对低碳氮比（C/N）废水进行修复的可行性。与不添加 S0 和/或有机物的系统（-3.4%∼5.0%）相比，当同时添加 S0 和有机物时，随着碳氮比和 S0 投加量的增加，氮去除率更高（18.2%∼59.8%）。S0 和有机物的协同作用刺激了细胞外高分子物质的分泌，削弱了 S0 分子间的结合力，促进了 S0 的生物利用，减少了对外部有机物的需求。它还促进了微生物的新陈代谢（0.16 ∼ 0.24 μg O2/（g VSS-h））和氨同化（5.9 % ∼ 20.5 %），从而提高了有机物的捕获量，为 SND 提供了更多的电子供体。此外，好氧脱氮因子（15.91 %∼27.45 %）、好氧脱氮基因（napA 和 nirS）和氨同化基因也在这种协同作用下得到积累。该研究揭示了 S0 与有机物配位诱导 SND 的机理，为引发高效稳定的 SND 提供了一种创新策略。

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.

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