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首页> 外文期刊>Biodegradation >Perchlorate reduction by hydrogen autotrophic bacteria and microbial community analysis using high-throughput sequencing
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Perchlorate reduction by hydrogen autotrophic bacteria and microbial community analysis using high-throughput sequencing

机译：自养氢细菌减少高氯酸盐并使用高通量测序进行微生物群落分析

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摘要

Hydrogen autotrophic reduction of perchlorate have advantages of high removal efficiency and harmless to drinking water. But so far the reported information about the microbial community structure was comparatively limited, changes in the biodiversity and the dominant bacteria during acclimation process required detailed study. In this study, perchlorate-reducing hydrogen autotrophic bacteria were acclimated by hydrogen aeration from activated sludge. For the first time, high-throughput sequencing was applied to analyze changes in biodiversity and the dominant bacteria during acclimation process. The Michaelis-Menten model described the perchlorate reduction kinetics well. Model parameters q(max) and K-s were 2.521-3.245 (mg ClO4-/gVSS h) and 5.44-8.23 (mg/l), respectively. Microbial perchlorate reduction occurred across at pH range 5.0-11.0; removal was highest at pH 9.0. The enriched mixed bacteria could use perchlorate, nitrate and sulfate as electron accepter, and the sequence of preference was: NO3- > ClO4- > SO42-. Compared to the feed culture, biodiversity decreased greatly during acclimation process, the microbial community structure gradually stabilized after 9 acclimation cycles. The Thauera genus related to Rhodocyclales was the dominated perchlorate reducing bacteria (PRB) in the mixed culture.
机译：自养氢的高氯酸盐还原具有去除效率高，对饮用水无害的优点。但是到目前为止，关于微生物群落结构的报道信息相对有限，在驯化过程中生物多样性和优势细菌的变化需要详细研究。在这项研究中，通过去除活性污泥中的氢气，使减少高氯酸盐的自养氢细菌适应环境。高通量测序首次用于分析适应过程中生物多样性和优势细菌的变化。 Michaelis-Menten模型很好地描述了高氯酸盐的还原动力学。模型参数q（max）和K-s分别为2.521-3.245（mg ClO4- / gVSS h）和5.44-8.23（mg / l）。 pH值在5.0-11.0范围内微生物高氯酸盐的还原发生;在pH 9.0时去除率最高。富集的混合细菌可以使用高氯酸盐，硝酸盐和硫酸盐作为电子受体，其优先顺序为：NO3-> ClO4-> SO42-。与饲料培养相比，生物多样性在驯化过程中大大减少，经过9个驯化循环后微生物群落结构逐渐稳定。与杜鹃花属有关的Thauera属是混合培养物中占主导地位的高氯酸盐还原菌（PRB）。

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