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首页> 外文期刊>Environmental Science & Technology >Start-up, microbial community analysis and formation of aerobic granules in a tert-butyl alcohol degrading sequencing batch reactor
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Start-up, microbial community analysis and formation of aerobic granules in a tert-butyl alcohol degrading sequencing batch reactor

机译：叔丁醇降解测序间歇反应器的启动，微生物群落分析和好氧颗粒的形成

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We demonstrate that compact well-settling aerobic granules can be developed in a sequencing batch reactor (SBR) for the biological removal of tert-butyl alcohol (TBA) using a strategy involving step increases in TBA loading rate achieved through increasing TBA concentrations in the influent. A moderate selection pressure that included a cycle time of 24 h and a start-of-cycle TBA concentration of 100 mg/L was initially introduced to encourage the growth and retention of biomass and avoid biomass loss from hydraulic washout. Start-of-cycle TBA concentrations were increased to 150, 300, 450, and 600 mg/L on days 90, 100, 121, and 199, respectively. These increases were only introduced after complete TBA removal was accompanied by visible improvements in biomass concentration and biomass settling ability. This acclimation strategy produced incrementally higher biomass concentrations and better settling biomass with higher specific TBA biodegradation rates. Effluent TBA concentrations were consistently below the detection limit of 25 mu g/L. Aerobic granules were first observed about 180 days after reactor start-up. The granules had a clearly defined shape and appearance, settled significantly faster than the suspended sludge in the reactor, and eventually became the dominant form of biomass in the reactor. The adapted granules were capable of complete TBA removal and contained a stable microbial population with a low diversity of sequences of community 16S rRNA gene fragments. This study indicates that it is possible to use aerobic granules for TBA remediation and will contribute to a better understanding of how microbial acclimation can be exploited in the SBR to biologically remove recalcitrant xenobiotics.
机译：我们证明了紧凑的，沉降良好的好氧颗粒可以在测序分批反应器（SBR）中开发，用于通过使用通过增加进水中TBA浓度来实现TBA负载率逐步增加的策略来生物去除叔丁醇（TBA） 。最初引入适度的选择压力，其中包括24小时的循环时间和循环开始的TBA浓度为100 mg / L，以鼓励生物质的生长和保留，并避免水力冲刷损失生物质。在第90、100、121和199天，周期开始的TBA浓度分别增加到150、300、450和600 mg / L。这些增加只有在完全去除TBA之后伴随着生物量浓度和生物量沉降能力的明显改善才引入。这种适应策略产生了更高的生物量浓度，并以更高的比TBA生物降解速率更好地沉降了生物量。废水中的TBA浓度始终低于25μg / L的检测极限。在反应器启动后约180天首次观察到好氧颗粒。颗粒具有明确定义的形状和外观，比反应器中的悬浮污泥沉降速度快得多，并最终成为反应器中生物质的主要形式。适应的颗粒能够完全去除TBA，并包含稳定的微生物种群，群落16S rRNA基因片段的序列多样性低。这项研究表明，可以使用好氧颗粒进行TBA修复，并且将有助于更好地了解SBR中如何利用微生物驯化来生物去除顽固的异源生物。

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