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Effect of biopolymer clusters on the fouling property of sludge from a membrane bioreactor (MBR) and its control by ozonation

机译:生物聚合物簇对膜生物反应器(mBR)污泥污染特性的影响及其臭氧化控制

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摘要

Organic substances in the liquid phase of the sludge in a membrane bioreactor (MBR) have a profound impact on membrane fouling. In this study, a single-fibre microfiltration apparatus was developed to investigate the fouling propensity of MBR sludge and the effectiveness of ozonation in membrane fouling mitigation. The results show that biopolymer clusters (BPC) in the MBR suspension had a significant influence on the fouling potential of the sludge. An increase in BPC concentration by 20% and 60% from around 3.5 mg/l in the mixed sludge liquor drastically increased the fouling rate by 120% and 300%, respectively. Ozonation of the BPC solution greatly reduced the detrimental role of BPC in membrane fouling. An ozone dose of 0.03 mg/mg TOC of BPC could reduce the mean BPC size from 38 to 27 μm, which was further reduced to 12 μm at 0.3 mg O3/mg TOC of BPC. In addition to BPC destruction, ozonation apparently also modified the surface properties of BPC, resulting in an increase in the filterable fraction and a decrease in the liquid viscosity. Based on the experimental findings, an approach for MBR membrane fouling control is proposed that applies ozonation to the supernatant containing BPC in a side-stream application. © 2010 Elsevier Ltd. All rights reserved.
机译:膜生物反应器(MBR)中污泥液相中的有机物对膜污染有深远影响。在这项研究中,开发了一种单纤维微滤设备,以研究MBR污泥的结垢倾向以及臭氧化在减轻膜结垢方面的有效性。结果表明,MBR悬浮液中的生物聚合物簇(BPC)对污泥的结垢潜力有重大影响。 BPC浓度从混合污泥液中的约3.5 mg / l分别提高了20%和60%,分别使结垢率分别提高了120%和300%。 BPC溶液的臭氧化大大降低了BPC在膜污染中的有害作用。臭氧剂量为0.03 mg / mg BPC TOC可以将平均BPC尺寸从38微米减小到27μm,在0.3 mg O3 / mg BPC TOC下可以进一步减小至12μm。除破坏BPC外,臭氧化显然还改变了BPC的表面性能,导致可过滤部分的增加和液体粘度的降低。基于实验结果,提出了一种用于MBR膜结垢控制的方法,该方法在侧流应用中对包含BPC的上清液进行臭氧处理。 ©2010 ElsevierLtd。保留所有权利。

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    Sun FY; Wang XM; Li XY;

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  • 年度 2011
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  • 正文语种 eng
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