推进低 C/N 比废水中的自养脱氮:超级电容器在增强微生物电解池中的创新应用

IF 5.9 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Journal of Environmental Sciences-china Pub Date : 2024-05-03 DOI:10.1016/j.jes.2024.04.042
Sen Fan , Yuhan Song , Decong Zheng , Xinyuan Peng , Sitao Li , Ping Gao , Daping Li
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引用次数: 0

摘要

本研究提出了一种新方法--超级电容器微生物电解池(SC-MEC),该方法利用超级电容器作为外部电源来提高低碳氮比废水的自养脱氮效率。研究结果表明,SC-MEC 系统在厌氧条件下运行,没有任何有机碳源,仅依靠氨氮作为电子供体,在氨氧化和总氮(TN)去除方面表现出卓越的性能。在电压为 1.8 V、电容容量为 30 F 的条件下运行时,氨的氧化率高达 56.51 mg/L/天,TN 的去除率高达 54.64 mg/L/天,其中 97% 的铵态氮被转化为气态氮。此外,超级电容器的充放电过程可自主调节双极电位。循环伏安法(CV)分析表明,在反应过程中,SC-MEC 系统的电化学活性显著增强。根据原位 CV 测试结果推断,这种增强与细胞外电子传递介质有关。微生物群落分析表明,硝化和反硝化(SND)同步进行,并伴有anammox作用,涉及多个菌属,如Candidatus Kuenenia、Nitrosomonas、Truepera和Bosea。总之,本研究强调了 SC-MEC 在实现高效自养脱氮方面的巨大潜力,为解决低 C/N 水污染问题提供了更可行、更经济的解决方案。
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Advancing autotrophic nitrogen removal in low C/N ratio wastewater: Innovative application of supercapacitor to enhance microbial electrolysis cells

This study presents a novel approach, the Supercapacitor Microbial Electrolysis Cell (SC-MEC), which utilizes a supercapacitor as an external power source to enhance the efficiency of autotrophic nitrogen removal in low C/N ratio wastewater. The results demonstrated that the SC-MEC system, operating under anaerobic conditions and devoid of any organic carbon source, exhibited exceptional performance in ammonia oxidation and total nitrogen (TN) removal when solely relying on ammonia nitrogen as the electron donor. Operating at a voltage of 1.8 V with a capacitance capacity of 30 F, ammonium oxidation rated up to 56.51 mg/L/day and TN removal rated up to 54.64 mg/L/day, in which 97% of ammonium nitrogen was converted to gaseous nitrogen. Furthermore, the charging and discharging process of supercapacitors autonomously regulated the bipolar potentials. Cyclic voltammetry (CV) analysis showed the significantly enhanced electrochemical activity of the SC-MEC system during the reaction process. Based on in-situ CV test results, it was inferred that this enhancement was associated with extracellular electron transfer mediators. The microbial community analysis revealed a process of synchronous nitrification and denitrification (SND) coupled with anammox, involving multiple genera, such as Candidatus Kuenenia, Nitrosomonas, Truepera, and Bosea. In conclusion, this study highlights the tremendous potential of SC-MEC in achieving efficient autotrophic nitrogen removal, offering more feasible and economical solutions for addressing low C/N water pollution issues.

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来源期刊
Journal of Environmental Sciences-china
Journal of Environmental Sciences-china 环境科学-环境科学
CiteScore
13.70
自引率
0.00%
发文量
6354
审稿时长
2.6 months
期刊介绍: The Journal of Environmental Sciences is an international journal started in 1989. The journal is devoted to publish original, peer-reviewed research papers on main aspects of environmental sciences, such as environmental chemistry, environmental biology, ecology, geosciences and environmental physics. Appropriate subjects include basic and applied research on atmospheric, terrestrial and aquatic environments, pollution control and abatement technology, conservation of natural resources, environmental health and toxicology. Announcements of international environmental science meetings and other recent information are also included.
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