Toxic compounds, such as 4-chlorophenol (4-CP), which is a common pollutant in wastewater, are removed efficiently from sequencing batch reactors (SBRs) by microorganisms. The bacterial community in aerobic granules formed during the removal of 4-CP in a SBR was monitored for 63 days. The SBR reactor was operated with a constant filling and withdrawal time of 7 and 8 min and decreasing settling time (30, 5, 3 and 2 min) to induce the formation of aerobic granules. During the acclimation period lasting 15 days (30 min settling time) had a strong effect on the bacterial community. From day 18 onwards, Sphingobium and Comamonadaceae were detected. Rhizobiaceae were dominant from day 24 to day 28 when stable aerobic granules were formed. At day 35, fluffy granules were formed, but the bacterial community structure did not change, despite the changes in the reactor operation to inhibit filamentous bacteria growth. This is the first report on changes in the bacterial community structure of aerobic and fluffy granules during granulation process in a reactor fed with 4-CP and the prediction of its metabolic pathways.

中文翻译：

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在顺序沉降反应器中，在不同的沉降时间下，由4-氯苯酚供应的好氧和蓬松颗粒中的微生物群落结构

废水中的一种常见污染物，例如4-氯苯酚（4-CP）等有毒化合物，可通过微生物从定序批处理反应器（SBR）中有效去除。监测在SBR中去除4-CP期间形成的好氧颗粒中的细菌群落，持续63天。SBR反应器在7和8分钟的恒定填充和退出时间以及减少的沉降时间（30、5、3和2分钟）下运行，以诱导好氧颗粒的形成。在适应期中，持续15天（30分钟的建立时间）对细菌群落有很强的影响。18天起，Sphingobium和Comamonadaceae进行检测。根瘤菌科从第24天到第28天形成稳定的好氧颗粒时占主导地位。在第35天，形成了蓬松的颗粒，但是尽管改变了反应器操作以抑制丝状细菌的生长，细菌群落结构也没有改变。这是第一个关于4-CP进料反应器造粒过程中好氧和蓬松颗粒细菌群落结构变化及其代谢途径预测的报道。