College of Environment and Ecology, Chongqing University, Chongqing 400044, China; Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400044, China.
College of Environment and Ecology, Chongqing University, Chongqing 400044, China; Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400044, China.
Bioresour Technol. 2020 Oct;313:123660. doi: 10.1016/j.biortech.2020.123660. Epub 2020 Jun 12.
The steady mixed biofilm electrode (MBE) was investigated for the removal of nitrogen from mustard tuber wastewater. Results showed that complete nitrogen removal occurred over a wide initial chemical oxygen demand (COD)/total nitrogen (TN) ratio ranging from 2.8 to 9.8 using MBE. MBE revealed broad-spectrum applicability for the treatment of high-salinity wastewater containing different forms of nitrogen. Bio-electrochemical process, in-situ heterotrophic nitrogen reduction, ammonia stripping, nitrogen assimilation, and endogenous denitrification coexisted for the removal of nitrogen. Batch activity tests and functional microorganism analysis confirmed that autotrophic/heterotrophic nitrification, anoxic/aerobic denitrification, and nitrogen bio-electrochemical reduction cooperated to achieve efficient nitrogen conversion. More importantly, the analysis of the preliminary energy balance demonstrated that MBE was self-sustaining. The long-term operation stability of MBE was of great importance for its practical application. The results provided herein offer new insights into bioelectrochemical nitrogen removal and resource treatment of high-salinity wastewater.
稳定混合生物膜电极（MBE）用于从芥菜废水脱氮。结果表明，MBE 在初始化学需氧量（COD）/总氮（TN）比从 2.8 到 9.8 的较宽范围内可完全脱氮。MBE 显示出对含有不同形式氮的高盐废水处理的广谱适用性。生物电化学过程、原位异养氮还原、氨汽提、氮同化和内源性反硝化共同脱氮。批处理活性测试和功能微生物分析证实，自养/异养硝化、缺氧/好氧反硝化和氮生物电化学还原协同作用以实现高效的氮转化。更重要的是，初步能量平衡分析表明 MBE 是自给自足的。MBE 的长期运行稳定性对于其实际应用非常重要。本文的结果为高盐废水的生物电化学脱氮和资源处理提供了新的见解。
