Assessment of membrane bioreactor fouling with the addition of suspended aluminum nitride nanoparticles
Assessment of membrane bioreactor fouling with the addition of suspended aluminum nitride nanoparticles
复制标题
添加悬浮氮化铝纳米颗粒的膜生物反应器污染评估
DOI：
10.1016/j.chemosphere.2019.124473
复制
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;Ye Biao;Xia Siqing
In this study, we assessed fouling in a membrane bioreactor (MBR) with the addition of suspended aluminum nitride (AlN) nanoparticles (NPs). Three parallel laboratory-scale submerged MBRs were operated with 0, 10, and 50 mg AlN NPs/L for over 70 days. The results showed that the addition of suspended AlN NPs did not significantly affect pollutant biodegradation; there was only a slight decrease in NH4+-N removal. Furthermore, the membrane's permeability was increased with effective fouling mitigation by the addition of a high amount of suspended AlN NPs. This was because the suspended AlN NPs decreased the content of polysaccharides in both the extracellular polymeric substances and soluble microbial products, and decreased the sludge floc size. However, the AlN NPs also promoted pore-blocking, particularly standard blocking, which enhanced irreversible fouling. Additionally, owing to the larger ionic radius and higher electronegativity, the AlN NPs inhibited the accumulation of framework components (SiO2). Therefore, suspended AlN NPs resulted in a thinner cake layer.
