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Correlation between extracellular polymeric substances and aerobic biogranulation in membrane bioreactor

机译：膜生物反应器中细胞外聚合物与好氧生物颗粒的相关性

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摘要

The correlation between extracellular polymeric substances (EPS) and sludge morphology, especially aerobic biogranulation, in membrane bioreactor (MBR) system, was investigated in this study. Two MBR systems were operated in the same nutrient and environmental conditions, into which aerobic floc sludge and granular sludge were respectively inoculated and called as MFSBR and MGSBR. In MFSBR system, aerobic biogranules (0.5 mm in average diameter) were emerged from floc sludge on day 21 of operation, and grew to 1.2 mm on day 31. In MGSBR system, there was a decrease in average diameter of biogranules from 2.8 mm (when inoculated) to 2.1 mm (on day 34 of operation). There was an overgrowth of filamentous bacteria demonstrated by SEM observation. Although polysaccharides were essential, proteins were the predominant component of aerobic granular sludge and the appropriate polysaccharides/proteins ratio was 0.6:1.0 for aerobic granulation in MBR system (under conditions examined). The sludge/supernatant EPS ratio of 44-45 and 110-130mg/gMLSS of the total EPS amount were favorable for biogranulation. To control the EPS amount in MBR system, weakening the strength of aeration and shortening sludge retention time (SRT) would be beneficial. Even though the development of the aerobic biogranules and stability were still relatively undefined and unknown (not well studied) from this study, it was possible that aerobic biogranules were cultivated from aerobic floc sludge and their morphology was preserved in MBR for long, but not only in sequencing batch reactor (SBR), if the operating parameters were well controlled.
机译：在膜生物反应器（MBR）系统中，研究了细胞外聚合物（EPS）与污泥形态，特别是好氧生物造粒之间的相关性。两个MBR系统在相同的养分和环境条件下运行，分别接种了好氧絮凝污泥和颗粒污泥，分别称为MFSBR和MGSBR。在MFSBR系统中，好氧生物颗粒（平均直径为0.5毫米）在运行的第21天从絮状污泥中浮出，并在第31天增长到1.2毫米。在MGSBR系统中，生物颗粒的平均直径从2.8毫米（ （接种后）至2.1毫米（在手术第34天）。 SEM观察表明丝状细菌过度生长。尽管多糖是必不可少的，但蛋白质是好氧颗粒污泥的主要成分，MBR系统中有氧造粒的合适多糖/蛋白质比为0.6：1.0（在检查条件下）。污泥/上清液EPS总量的比例为44-45和110-130mg / gMLSS，有利于生物制粒。为了控制MBR系统中的EPS量，弱化曝气强度和缩短污泥保留时间（SRT）将是有益的。即使好氧生物颗粒的发展和稳定性仍然相对不确定，并且在本研究中尚不清楚（未进行充分研究），但好氧生物颗粒可能是从好氧絮状污泥中培养出来的，它们的形态在MBR中保存了很长时间，但不仅如此如果操作参数得到了很好的控制，则可在定序分批反应器（SBR）中使用。

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