低C/N比废水中不同电子供体对生物电化学反硝化影响的研究进展

Research Progress on the Effects of Different Electron Donors on Bioelectrochemical Denitrification in Low C/N Ratio Wastewater

摘要: 硝态氮是低C/N比废水中的常见污染物，其易引起地下水污染、水体富营养化等危害。生物电化学系统(BES)能够实现硝态氮的反硝化降解，具有反应条件温和、能耗低和环境友好型等特点。然而，在处理低C/N比废水时，电子供体的类型往往决定了反硝化的性能。因此，阐明不同电子供体对BES反硝化过程的电子传递和供给机制尤为关键。本文综述了有机、无机和内源性等不同类型电子供体对BES反硝化过程的适配性与电子传递机制，并提出总结与展望。本文旨在为低C/N比废水生物反硝化过程中电子供体的选择与优化提供科学依据。

Abstract: Nitrate is a common pollutant in wastewater with a low C/N ratio, which can cause groundwater pollution, eutrophication of water bodies and other hazards. The bioelectrochemical system (BES) can achieve denitrification, with the characteristics of mild reaction conditions, low energy consumption and environmental friendliness. However, when treating wastewater with a severely deficient electron donor and a low C/N ratio, problems such as accumulation of intermediate products and low total nitrogen removal efficiency are prone to occur in BES. Therefore, it is particularly important to clarify the electron transfer and supply mechanisms of different electron donors in the denitrification process of BES. This paper reviews the adaptability and electron transfer mechanisms of different types of electron donors, including organic, inorganic and endogenous ones, to the denitrification process of BES, elaborates on the denitrification metabolism of microorganisms when hydrogen is used as an electron donor, and discusses the effects of different microbial community interaction forms on the electron transfer efficiency and nitrogen removal of BES. Finally, it provides a summary and outlook. This paper aims to provide a scientific basis for the selection and optimization of electron donors in the biological denitrification process of wastewater with a low C/N ratio.