Cure of Filament-Caused MBR Fouling in the Presence of Antibiotics: Taking Ciprofloxacin Exposure As an Example
Cure of Filament-Caused MBR Fouling in the Presence of Antibiotics: Taking Ciprofloxacin Exposure As an Example
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DOI：
10.1021/ie301401a
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发表时间：
2012-10
影响因子：
4.2
通讯作者：
F. Meng;Zhizhen Wang;Yue Li
中科院分区：
文献类型：
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作者：
F. Meng;Zhizhen Wang;Yue Li
药品和个人护理产品（PPCP）在废水流中无处不在，但人们对它们在膜生物反应器（MBR）运行期间在膜污染中的作用知之甚少。本研究试图了解环丙沙星暴露在控制丝状菌膨胀以及缓解膜污染方面的作用。结果表明，与对照MBR相比，环丙沙星能选择性地抑制和杀灭混合液中存在的丝状菌，从而显著改善污泥的沉降性能。环丙沙星的投加对有机物的去除和硝化作用影响不大，但对反硝化作用有不利影响。此外，环丙沙星处理后的污泥絮体仍保持紧密的结构，最终形成颗粒污泥，这可能与胞外聚合物（EPS）中多糖含量增加有关。通过核磁共振（NMR）表征证实了多糖在暴露于环丙沙星的EPS中的富集。另一方面，由于EPS的释放和细丝的腐烂，可溶性微生物产物（SMP），特别是可溶性多糖，在MBR暴露于环丙沙星显着增加。尽管如此，本研究的结果表明，废水流中微量污染物的存在可能会在MBR污垢控制中发挥一些积极的作用。
Pharmaceuticals and personal care products (PPCPs) are ubiquitous in wastewater streams, but little is known regarding their roles in membrane fouling during the operation of membrane bioreactors (MBRs). This study attempted to understand the role of ciprofloxacin exposure in control of filamentous bulking as well as membrane fouling mitigation. Compared with the control MBR, results show that the ciprofloxacin could selectively inhibit and kill filaments present in the mixed liquor, and, as a consequence, the sludge settleability improved significantly. The addition of ciprofloxacin had little influence on organic removals and nitrification, but had an adverse effect on denitrification. In addition, the sludge flocs exposure to ciprofloxacin still kept in compact structure; specifically, granular sludge was finally formed possibly due to the increase of polysaccharides in extracellular polymeric substances (EPS). Characterization by nuclear magnetic resonance (NMR) corroborated the enrichment of polysaccharides in the EPS exposure to ciprofloxacin. On the other hand, because of the release of EPS and the decay of filaments, soluble microbial products (SMP), particularly soluble polysaccharides, increased significantly in the MBR exposure to ciprofloxacin. Despite this, the results of this study show that the presence of trace contaminants in wastewater streams may play some positive roles in MBR fouling control.