Quorum sensing improves start-up and stability of sulfate-reducing biocathode in autotrophic microbial electrolytic cell for low-organic-carbon sulfate wastewater treatment

Xiang, Junping; Pan, Yubing; Shi, Ke; Yao, Yuehong; Cheng, Dongle; Jiang, Qing; Gao, Yu; Xue, Jianliang; Qiao, Yanlu

doi:10.1016/j.jece.2024.113725

Journal of Environmental Chemical Engineering

2024

DOI: 10.1016/j.jece.2024.113725

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Quorum sensing improves start-up and stability of sulfate-reducing biocathode in autotrophic microbial electrolytic cell for low-organic-carbon sulfate wastewater treatment

Junping Xiang,

Yubing Pan,

Ke Shi

et al.

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2024

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Cited by 2 publications

References 66 publications

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Biochar Reduced the Risks of Human Bacterial Pathogens in Soil via Disturbing Quorum Sensing Mediated by Persistent Free Radicals

Cheng,

Lu,

Chen

et al. 2024

Environ. Sci. Technol.

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Biochar has great potential in reducing the abundance of antibiotic resistance genes (ARGs) and mobile genetic elements (MGEs) from soil. However, its efficiency in removing other biological pollutants, such as human bacterial pathogens (HBPs) and virulence factor genes (VFGs), is rarely studied. Herein, by pyrolyzing rice straw (RS) and pine wood (PW) at 350 and 700 °C, we prepared a series of biochar (RS350, RS700, PW350, and PW700) and investigated their impacts on the abundance and pathogenicity of HBPs. Compared with PW biochar, RS biochar effectively reduced the abundance of HBPs by 6.3−40.1%, as well as their pathogenicity, evidenced by an 8.2− 10.1% reduction in the abundance of VFGs. Mechanistically, more persistent free radicals (PFRs) were formed in RS biochar than that of PW biochar during pyrolysis, and PFRs triggered the degradation of N-butyryl-L-homoserine lactone (C4-HSL) from 1.05 to 0.68 ng/kg, thereby disturbing the quorum sensing (QS) of HBPs. Once the QS was disturbed, the communications among HBPs were hindered, and their virulence factors were reduced, which ultimately lowered the abundance and pathogenicity of HBPs. Collectively, our study provides insights into the role of biochar in decreasing the risks of HBPs, which is significant in the development of biochar-based technologies for soil remediation.

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Biochar Reduced the Risks of Human Bacterial Pathogens in Soil via Disturbing Quorum Sensing Mediated by Persistent Free Radicals

Cheng,

Lu,

Chen

et al. 2024

Environ. Sci. Technol.

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Electron Transfer Improved by Nanoscale Zero-Valent Iron to Enhance Sulfate Reduction of the Anaerobic System under a Low Chemical Oxygen Demand-to-Sulfate Ratio

Xue,

Yao,

et al. 2024

ACS EST Water

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Insufficient availability of electron donors during the biological treatment of sulfate-rich wastewater can hinder the efficient and targeted removal of sulfate. Nanoscale zerovalent iron (nZVI) has been shown to enhance the anaerobic biological treatment of sulfate reduction as an electron donor; however, the exact mechanism of electron transfer remains unclear. Thus, this work delved into the impact of nZVI on enhancing the performance of an anaerobic biosystem, elucidating the underlying improvement mechanism systematically. The sulfate removal efficiency of an anaerobic biosystem could be enhanced by 30% through the use of nZVI under a chemical oxygen demand-tosulfate ratio (COD/SO 4 2− ) of 0.3. The introduction of nZVI through electrochemical experiments has been shown to enhance the electrical conductivity and capacitance of anaerobic sludge. In addition, it could also stimulate the secretion of c-type cytochrome and extracellular polymeric substances. These findings collectively confirmed that the addition of nZVI enhanced electron transfer among microbial communities within the system. Moreover, nZVI facilitated the transition of important sulfate-reducing bacteria, specifically from Desulfobulbus to Desulfomicrobium, which can engage in direct interspecies electron transfer. Within a specific range, nZVI enhanced assimilatory sulfate reduction, leading to a heightened conversion of sulfate into sulfite, thereby enhancing sulfate reduction.

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Quorum sensing improves start-up and stability of sulfate-reducing biocathode in autotrophic microbial electrolytic cell for low-organic-carbon sulfate wastewater treatment

Cited by 2 publications

References 66 publications

Biochar Reduced the Risks of Human Bacterial Pathogens in Soil via Disturbing Quorum Sensing Mediated by Persistent Free Radicals

Biochar Reduced the Risks of Human Bacterial Pathogens in Soil via Disturbing Quorum Sensing Mediated by Persistent Free Radicals

Electron Transfer Improved by Nanoscale Zero-Valent Iron to Enhance Sulfate Reduction of the Anaerobic System under a Low Chemical Oxygen Demand-to-Sulfate Ratio

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