污泥中铜毒杆菌降解褐煤的机制

IF 3.2 4区 生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY
Yaya Wang, Weilong Cao, Tianyu Zhu, Jiaxuan Li, Damir Nussipov, Kuanysh Tastambek, Xiangrong Liu
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引用次数: 0

摘要

褐煤是一种低阶煤,通常用作燃料来源。然而,它的高硫和灰分含量会导致燃烧时释放有害物质。微生物煤降解提供了一种比传统的化学和物理方法更环保的煤处理方法。在这项研究中,我们获得了一种从活性污泥中分离出来的细菌,命名为Cupriavidus sp,它具有褐煤降解的潜力。通过16S rDNA测序鉴定,系统评价了菌株S4对山西褐煤的降解特性及降解机制。测定菌株S4的胞外酶活性,发现其分泌木质素过氧化物酶、锰过氧化物酶、漆酶、碱性蛋白酶和淀粉酶,表明其具有多酶协同降解能力。扫描电镜(SEM)观察证实,细菌可以吸附在煤表面。傅里叶变换红外光谱(FTIR)分析表明,煤上的游离羟基显著增加,有利于降解。液相产物的气相色谱-质谱(GC-MS)和三维荧光光谱分析表明,降解液中长链烷烃和酚类化合物的含量明显增加,腐殖质物质的检测也明显增加。进一步的研究表明,菌株S4通过分泌富含蛋白质和多糖的胞外聚合物(EPS)介导初始吸附,这凸显了微生物-煤界面相互作用的关键机制。该研究为褐煤生物修复技术的发展和功能菌株的资源化应用提供了理论基础。图形抽象
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The mechanism underlying lignite biodegradation by Cupriavidus sp isolated from sludge

Lignite, a low-rank coal, is commonly utilized as a fuel source. However, its high sulfur and ash content can result in the release of harmful substances during combustion. Microbial coal degradation offers a more environmentally friendly alternative to traditional chemical and physical methods of coal treatment. In this study, we obtained a bacterium, named as Cupriavidus sp isolated from activated sludge that exhibits potential for lignite degradation. After identification via 16S rDNA sequencing, the degradation characteristics and mechanisms of strain S4 on lignite from Shanxi, were systematically evaluated. Extracellular enzyme activities of strain S4 were measured, revealing the secretion of lignin peroxidase, manganese peroxidase, laccase, alkaline protease, and amylase, indicating its capacity for multi-enzyme synergistic degradation. Scanning electron microscopy (SEM) observations confirmed that the bacterium could adsorb onto the coal surface. Fourier transform infrared spectroscopy (FTIR) analysis demonstrated a significant increase in free hydroxyl groups on the coal, which facilitates degradation. Gas chromatography-mass spectrometry (GC–MS) and three-dimensional fluorescence spectroscopy analyses of the liquid-phase products showed a notable increase in long-chain alkanes and phenolic compounds in the degradation liquid, along with the detection of humic substances. Further studies indicated that strain S4 mediates initial adsorption through the secretion of extracellular polymers (EPS) rich in proteins and polysaccharides, highlighting the key mechanism of microbial-coal interface interaction. This study provides a theoretical foundation for the development of lignite bioremediation technologies and the resource-based application of functional bacterial strains.

Graphical abstract

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来源期刊
Biodegradation
Biodegradation 工程技术-生物工程与应用微生物
CiteScore
5.60
自引率
0.00%
发文量
36
审稿时长
6 months
期刊介绍: Biodegradation publishes papers, reviews and mini-reviews on the biotransformation, mineralization, detoxification, recycling, amelioration or treatment of chemicals or waste materials by naturally-occurring microbial strains, microbial associations, or recombinant organisms. Coverage spans a range of topics, including Biochemistry of biodegradative pathways; Genetics of biodegradative organisms and development of recombinant biodegrading organisms; Molecular biology-based studies of biodegradative microbial communities; Enhancement of naturally-occurring biodegradative properties and activities. Also featured are novel applications of biodegradation and biotransformation technology, to soil, water, sewage, heavy metals and radionuclides, organohalogens, high-COD wastes, straight-, branched-chain and aromatic hydrocarbons; Coverage extends to design and scale-up of laboratory processes and bioreactor systems. Also offered are papers on economic and legal aspects of biological treatment of waste.
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