Potential effects of suspended TiO2 nanoparticles on activated sludge floc properties in membrane bioreactors
Potential effects of suspended TiO2 nanoparticles on activated sludge floc properties in membrane bioreactors
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悬浮 TiO2 纳米颗粒对膜生物反应器中活性污泥絮体特性的潜在影响
DOI：
10.1016/j.chemosphere.2019.02.042
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发表时间：
2019
期刊：
影响因子：
8.8
通讯作者：
Xia Siqing
中科院分区：
文献类型：
--
作者：
Zhou Lijie;Zhuang Wei Qin;De Costa Yashika;Xia Siqing
随着含纳米颗粒（NPs）尤其是二氧化钛（TiO2） NPs的消费品的快速发展和应用，悬浮NPs对废水处理的潜在影响近年来受到人们的关注。本研究探讨了悬浮tio2纳米粒子对膜生物反应器（MBR）活性污泥絮凝性能的潜在影响。结果表明，悬浮TiO2NPs抑制了活性污泥絮凝体的活力，导致细菌蛋白分泌，起到细菌保护作用，导致可溶性微生物产物整体蛋白含量增加。悬浮TiO2NPs还会破坏活性污泥絮凝体结构的稳定性，降低絮凝体的絮凝能力，导致有机物过量产生，导致絮凝体粒径下降50%以上。悬浮TiO2NPs还引起了细菌群落系统发育分布的变化。其中，活性污泥中的优势菌种由comamonadaceaetothiotrichaceaein 50 mg/L悬浮TiO2NPs取代。
With the rapid development and application of consumer products containing nanoparticles (NPs), especially titanium dioxide (TiO2) NPs, the potential effects of suspended NPs on wastewater treatment has been a concern over the recent years. This study investigated the potential effects of suspended TiO2NPs on activated sludge flocculation properties in a membrane bioreactor (MBR). Results showed that suspended TiO2NPs inhibited the viability of activated sludge flocs, and led to bacterial protein secretion for bacterial protection, causing an overall protein increase of soluble microbial products. Suspended TiO2NPs also destabilized the activated sludge floc structure and reduced flocculation capacity of flocs, causing an over production of organic matter and resulting in a floc size decrease of over 50%. Suspended TiO2NPs also caused a change in the phylogenetic distribution of bacterial community. Whereby, the dominant species in activated sludge was replaced fromComamonadaceaetoThiotrichaceaein 50 mg/L suspended TiO2NPs.