Bidirectional extracellular electron transfers in Serratia marcescens and Stenotrophomonas sp. correlate to EPS and Cr(VI) removal in single-chamber bioelectrochemical systems

IF 2.8 4区 生物学 Q3 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Yiying Yan, Qiang Wang, Liping Huang, Xin Xing, Yong Shi, Miao Wang, Gianluca Li Puma
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引用次数: 0

Abstract

BACKGROUND

Electrochemically active bacteria (EAB) capable of bidirectional extracellular electron transfer (EET), either outward or inward EET, largely control the efficiency of interactions and electrical communication between biofilm and electrode and, thus, control the performance of bioelectrochemical systems (BESs) for heavy metals removal. However, the behavior of such metallurgical EAB capable of bidirectional EET has yet to be investigated, and the role of extracellular polymeric substances (EPS) in these switchable EAB with bidirectional EET and in the presence of heavy metals remains unexplored in the single-chamber BESs treating heavy metal-based wastewaters that are limited by carbon/electron sources or electron acceptors.

RESULTS

The biofilms of the Cr(VI)-tolerant EAB Stenotrophomonas sp. YS1 and Serratia marcescens Q1 exhibited bidirectional EET metabolizing either organic (acetate) or inorganic (HCO3) species with simultaneous removal of Cr(VI) in single-chamber BESs. Q1 inward EET uptake of electrons was more efficient than that of YS1 (165 μA vs. 118 μA); meanwhile, YS1 outward EET was more efficient than Q1 (8.0 μA vs. 4.7–5.2 μA). The adaptive electrochemically-tunable EPS in both biofilm strains was regulated by the direction of the EET (inward or outward) in the presence of Cr(VI) and circuital current.

CONCLUSION

This study demonstrates the switching properties of EAB, such as Stenotrophomonas sp. or S. marcescens, that are capable of bidirectional EET to or from the electrodes, and it displays the regulation of such responses with the amount and compositional diversity of the biofilms’ EPS, giving a comprehensive appreciation of tunable EPS for Cr(VI)-wastewater treatment in single-chamber BESs. © 2024 Society of Chemical Industry (SCI).

在单室生物电化学系统中,肉质沙雷氏菌和臭腺单胞菌的双向胞外电子转移与 EPS 和六价铬的去除相关联
背景具有双向胞外电子转移(EET)能力的电化学活性细菌(EAB),无论是向外还是向内的 EET,在很大程度上控制着生物膜与电极之间的相互作用和电交流的效率,从而控制着生物电化学系统(BES)去除重金属的性能。然而,对于处理重金属废水的单室生物电化学系统(BES)来说,由于受到碳/电子源或电子受体的限制,细胞外高分子物质(EPS)在这些具有双向 EET 的可切换 EAB 中以及在重金属存在的情况下的作用仍有待研究。结果耐六价铬的 EAB Stenotrophomonas sp. YS1 和 Serratia marcescens Q1 的生物膜表现出双向 EET 代谢,在单室 BES 中代谢有机物(醋酸盐)或无机物(HCO3-),同时去除六价铬。Q1 向内 EET 吸收电子的效率高于 YS1(165 μA 对 118 μA);同时,YS1 向外 EET 的效率也高于 Q1(8.0 μA 对 4.7-5.2 μA)。在 Cr(VI) 和环流存在的情况下,这两种生物膜菌株中的自适应电化学可调 EPS 受 EET 方向(内向或外向)的调节。marcescens 等 EAB 能够与电极进行双向 EET,并显示了生物膜 EPS 的数量和组成多样性对这种反应的调节作用,从而全面了解了单室 BES 中用于处理六价铬废水的可调 EPS。© 2024 化学工业学会(SCI)。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
7.00
自引率
5.90%
发文量
268
审稿时长
1.7 months
期刊介绍: Journal of Chemical Technology and Biotechnology(JCTB) is an international, inter-disciplinary peer-reviewed journal concerned with the application of scientific discoveries and advancements in chemical and biological technology that aim towards economically and environmentally sustainable industrial processes.
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