Research progress of mixotrophic system in industrial wastewater of low C/N ratio

doi:10.16085/j.issn.1000-6613.2023-1037

Abstract

Abstract:

Since refractory nitrogen heterocyclic compounds in nitrogen-rich industrial wastewater aggravates the imbalance of carbon to nitrogen ratio and inhibits the nitrification and denitrification process in biological nitrogen removal process, exploring a new treatment process has become the inevitable course to efficiently treat low C/N industrial wastewater. Mixotrophic technology combines the metabolic pathways of heterotrophic and autotrophic nitrogen removal to optimize the nitrogen removal performance of low C/N industrial wastewater and further realizes the quality and efficiency improvement of low C/N industrial wastewater treatment. This paper reviews the mechanism, advance and influencing factors of Fe-mediated biological nitrogen removal, sulfur-mediated biological nitrogen removal and bacteria-algal symbiosis processes in mixotrophic nitrogen removal processes, and expounds the characteristics of the three processes and the applicability of different types of low C/N industrial wastewater. From the perspective of optimizing electron donor, acceptor and metabolic pathways, it is proposed to increase the electron capacity and the electron transfer rate, combining the electrochemical and coupling Fe-S system to enhance the collaborative metabolism, and improve the metabolic performance of pollutants.

Key words: low C/N ratio, industrial wastewater, nitrogen-containing heterocycle, mixotrophic

摘要：

富氮工业废水中难降解的氮杂环化合物加剧了碳氮比失衡，抑制了生物脱氮工艺中硝化反硝化过程，因而探究新型处理工艺是高效处理低C/N工业废水的必由之路。混合营养脱氮技术结合异养脱氮和自养脱氮的代谢路径，优化低C/N工业废水脱氮性能，进而实现低C/N工业废水处理提质增效。本文综述了混合营养脱氮工艺中铁介导生物脱氮、硫介导生物脱氮和菌藻共生脱氮工艺的作用机理、研究进展与影响因素，阐述了三种工艺特点及不同类型低C/N工业废水的适用性，并就三种混合营养脱氮工艺中存在的问题并结合当前研究方向，从优化电子供受体和代谢路径的角度提出增大电子容量、提高电子转移速率，结合电化学体系与Fe-S耦合增强协同代谢从而提升污染物代谢性能的建议。

关键词: 低C/N, 工业废水, 氮杂环化合物, 混合营养

CLC Number:

YAN Zipeng, ZHENG Mengqi, WANG Chengye, CHEN Guowei, WANG Wei, YUAN Shoujun, SU Kuizu. Research progress of mixotrophic system in industrial wastewater of low C/N ratio[J]. Chemical Industry and Engineering Progress, 2023, 42(12): 6567-6575.

鄢子鹏, 郑梦启, 王成业, 陈国炜, 王伟, 袁守军, 苏馈足. 混合营养脱氮在低C/N工业废水处理中的研究进展[J]. 化工进展, 2023, 42(12): 6567-6575.

Figures/Tables 4

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