Uncovering pathway and mechanism of simultaneous thiocyanate detoxicity and nitrate removal through anammox and denitrification

IF 10.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

npj Clean Water Pub Date : 2024-10-22 DOI:10.1038/s41545-024-00402-w

Xue Chen, Fuang Duan, Xi Yu, Yuyang Xie, Zhibin Wang, Shou-Qing Ni

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Abstract

Thiocyanate (SCN−) exists in various industries and is detrimental to the ecosystem, necessitating cost-effective and environmentally benign treatment. In response to alleviate the bacterial toxicity of SCN−, this study developed a two-stage coupled system by tandem of anammox in reactor 1 (R1) and SCN−-driven autotrophic denitrification in reactor 2 (R2), achieving simultaneous removal of SCN− and nitrogen. The total nitrogen removal efficiency of the coupled system was 92.42 ± 1.98%, with nearly 100% of SCN− elimination. Thiobacillus was responsible for SCN− degradation. The deduced degradation pathway of SCN− was via the cyanate pathway before coupling, followed by the co-action of cyanate pathway and carbonyl sulfide pathway after coupling. Although scaling-up study is needed to validate its applicability in real-world applications, this study contributes to the advancement of sustainable and cost-effective wastewater treatment technologies, being an attractive path for low-carbon nitrogen removal and greenhouse gas emission-free technology.

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通过anammox和反硝化作用揭示硫氰酸盐同时解毒和去除硝酸盐的途径和机制

硫氰酸盐（SCN-）存在于各行各业，对生态系统有害，因此需要成本效益高且对环境无害的处理方法。为减轻 SCN- 的细菌毒性，本研究开发了一种两级耦合系统，在反应器 1（R1）中串联厌氧反应，在反应器 2（R2）中串联 SCN 驱动的自养反硝化反应，实现 SCN- 和氮的同时去除。耦合系统的总脱氮效率为 92.42 ± 1.98%，其中 SCN- 的去除率接近 100%。硫杆菌负责降解 SCN-。推断的 SCN- 降解途径是耦合前通过氰酸盐途径，耦合后通过氰酸盐途径和羰基硫化物途径共同作用。尽管还需要扩大研究规模以验证其在实际应用中的适用性，但这项研究有助于推动可持续和具有成本效益的废水处理技术的发展，是低碳脱氮和无温室气体排放技术的一条有吸引力的途径。

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来源期刊

npj Clean Water Environmental Science-Water Science and Technology

CiteScore

15.30

自引率

2.60%

发文量

审稿时长

5 weeks

期刊介绍： npj Clean Water publishes high-quality papers that report cutting-edge science, technology, applications, policies, and societal issues contributing to a more sustainable supply of clean water. The journal's publications may also support and accelerate the achievement of Sustainable Development Goal 6, which focuses on clean water and sanitation.