Abstract This work investigated the operational and fouling characteristics of the combined oxidation ditch-membrane bioreactor under a continuous-flow mode. During the operating period (80 days), foulants gradually accumulated on the membrane surface and caused increasing in the filtration resistance, whose appearance showed obvious heterogeneity along with the variation of some influencing factors. Correlation analysis of all variable factors revealed the key factor that contributed to the difference in membrane fouling. Results indicated that the foulants with loose structure caused the largest ratio in membrane resistance among all the foulants on surface and they could be easily cleaned by a physical method. After totally physical and chemical cleaning, some residues still remained in the membrane module, which determined the lifespan of membrane modules. From the different operational stages, the foulants were sampled and characterized with multi-method to reveal their physic-chemical composition and microbial community, though, these properties and communities were very close to each other, the unique microbial species contained in the foulants might be an important factor leading to their different properties and actually determined their heterogeneity, which were also heavily affected by the temperature change.

中文翻译：

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连续流模式下组合氧化沟-膜生物反应器的运行和污染特性

摘要 本文研究了连续流动模式下组合氧化沟-膜生物反应器的操作和污染特性。在运行期间（80 d），污染物逐渐堆积在膜表面，导致过滤阻力增加，其外观表现出明显的异质性，并伴随着一些影响因素的变化。所有变量因素的相关分析揭示了导致膜污染差异的关键因素。结果表明，结构松散的污垢在所有表面污垢中的膜阻力比最大，可以通过物理方法轻松清除。经过完全物理和化学清洗后，膜组件中仍有一些残留物，这决定了膜组件的使用寿命。从不同的操作阶段，对污垢进行采样和表征，以揭示其理化成分和微生物群落，尽管这些特性和群落彼此非常接近，污垢中所含的独特微生物物种可能是一个重要因素导致它们的不同性质，实际上决定了它们的异质性，而异质性也受到温度变化的严重影响。