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首页> 外文期刊>Journal of Environmental Science and Health >Microbial succession in response to 1,4-dioxane exposure in activated sludge reactors: Effect of inoculum source and extra carbon addition
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Microbial succession in response to 1,4-dioxane exposure in activated sludge reactors: Effect of inoculum source and extra carbon addition

机译：活性污泥反应器中微生物对1,4-二恶烷暴露的响应：接种源和额外碳的添加的影响

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摘要

Bacterial community succession related to 1,4-dioxane exposure was investigated in two different activated sludge-inoculated reactors (municipal wastewater and dye industrial wastewater sludge), with or without additional carbon source, for 7 weeks. The denaturing gradient gel electrophoresis (DGGE) analysis revealed that microbial succession varied according to the inoculum sludge sources and the presence or absence of the extra carbon source. In the reactor inoculated with the municipal sludge, bacterial species belonging to α- and γ-Proteobacteria and Nitrospira class were dominant over time. On the other hand, bacterial species showing significant homology to β-Proteobacteria (e.g., Methylibium petroleiphilum PM1) and Actinobacteria class, who have been reported to have 1,4-dioxane degradation potential, were found in the industrial sludge-inoculated reactors. The appearance of these bacteria demonstrates that the microbial community structure of the inoculum and the presence of an extra carbon source affect the microbial succession in the system exposed to 1,4-dioxane.
机译：在有或没有额外碳源的两个不同的活性污泥接种反应器（市政废水和染料工业废水污泥）中研究了与1,4-二恶烷接触有关的细菌群落演替，历时7周。变性梯度凝胶电泳（DGGE）分析表明，微生物的演替根据接种污泥的来源以及是否存在额外的碳源而有所不同。在接种了城市污泥的反应器中，随着时间的流逝，属于α-和γ-变形杆菌属和硝化螺菌属的细菌种类占主导地位。另一方面，在工业污泥接种反应器中发现了与β-变形杆菌具有显着同源性的细菌菌种（例如，甲基化石棉PM1）和放线菌属类，据报道它们具有1，4-二恶烷降解的潜力。这些细菌的出现表明接种物的微生物群落结构和额外碳源的存在会影响暴露于1,4-二恶烷的系统中的微生物演替。

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