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首页> 外文期刊>Journal of industrial microbiology & biotechnology >Bacterial community dynamics in a rotating biological contactor treating 2-fluorophenol-containing wastewater.
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Bacterial community dynamics in a rotating biological contactor treating 2-fluorophenol-containing wastewater.

机译：旋转生物接触器处理含2-氟酚的废水中细菌群落动力学。

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One of the main factors affecting the performance of rotating biological contactors (RBC) is the biofilm characteristics. Therefore, a deep understanding of the microbial population dynamics and structure of the biofilm is mandatory if optimization of organic matter and nutrients removal is targeted. This study focused on the effects of organic shock loads of 2-fluorophenol (2-FP) on the microbial diversity present in an RBC biofilm. The RBC was seeded with activated sludge from a conventional wastewater treatment plant and was operated during 496 days. During the first 126 days, the RBC was subjected to intermittent 2-FP shocks of 25 mg l-1 and no degradation occurred. Therefore, the reactor was subsequently augmented with a 2-FP-degrading strain (FP1). Afterwards, the RBC had a stable performance when subjected to 2-FP shocks up to 50 mg l-1 and to a starvation period, as indicated by removal of the compound. Denaturing gradient gel electrophoresis (DGGE) revealed large shifts in microbial communities present in the first and fifth stages, although no clear relation between the sample collection time and spatial factor was found. Phylogenetic affiliation of some predominant members was assessed by direct sequencing of correspondent DGGE bands. Affiliations to alpha -, beta - and delta -Proteobacteria were found. Several bacterial strains isolated from the reactor showed capacity for 2-FP degradation. Strain FP1 was successfully recovered from the biofilm by plating and by DGGE, reinforcing that bioaugmentation was successfully achieved.
机译：影响旋转生物接触器（RBC）性能的主要因素之一是生物膜特性。因此，如果有针对性地优化有机物和营养物质的去除，则对微生物种群动态和生物膜结构的深刻理解是必不可少的。这项研究集中于2-氟苯酚（2-FP）的有机冲击负荷对RBC生物膜中微生物多样性的影响。 RBC接种了常规废水处理厂的活性污泥，运行496天。在最初的126天中，RBC受到25 mg l -1 的间歇性2-FP冲击，并且没有降解。因此，随后用2-FP降解菌株（FP1）增强反应器。此后，RBC在经受2-FP冲击至50 mg lsups-1 和挨饿期时具有稳定的性能，这是通过去除该化合物表明的。变性梯度凝胶电泳（DGGE）显示在第一和第五阶段存在的微生物群落发生了很大变化，尽管没有发现样品收集时间与空间因素之间的明确关系。通过直接测序相应的DGGE条带，评估了一些主要成员的系统发生隶属关系。发现了α-，β-和δ-Proteobacteria的隶属关系。从反应器分离出的几种细菌菌株显示出2-FP降解的能力。 FP1菌株通过平板接种和DGGE成功地从生物膜中回收，进一步证明成功实现了生物强化。

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