TIANJia-yu,GUOZhi-jie,HUANGRui,et al.Effect of Aggregate Size on Membrane Fouling of Hollow Flat Ceramic Membrane in MBR[J].China Water & Wastewater,2024,40(9):8-13.
骨料粒径对中空平板陶瓷膜MBR膜污染特性的影响
- Title:
- Effect of Aggregate Size on Membrane Fouling of Hollow Flat Ceramic Membrane in MBR
- 摘要:
- 有机微滤膜在MBR中存在严重的膜污染问题，中空平板陶瓷膜融合了陶瓷材质和平板构型两大优势，在MBR中表现出较好的应用前景。为探究骨料粒径对中空平板陶瓷膜MBR膜污染特性的影响，以不同粒径（1~10 μm）的刚玉粉体为骨料，通过挤压成型法制备了一系列中空平板陶瓷膜。结果表明，随着骨料粒径的增大，膜的孔径、渗透性能和表面粗糙度均增加，但在较大孔径范围内（0.11~1.30 μm），MBR出水水质并未受到影响。采用5 μm刚玉制备的陶瓷膜的跨膜压差增长速率最低，且孔内膜污染阻力占比最小，展现出优异的抗污染性能。膜表面污染物分析结果显示，其在运行中所积累的多糖、蛋白质浓度最低，污染层厚度最小且较为疏松，这可能与污染层中微生物种群结构的改善有关。可见，对中空平板陶瓷膜的骨料粒径进行优化调控是提高其抗污染性能行之有效的方法。
- Abstract:
- Polymeric microfiltration membrane has a serious problem of membrane fouling in MBR. Hollow flat ceramic membrane combines the advantages of ceramic material and flat configuration, and shows a strong application prospect in MBR. In order to investigate the effect of aggregate size on the fouling characteristics of hollow flat ceramic membrane in MBR, a series of membranes using corundum powder with different particle size（1-10 μm） as aggregate were prepared. The results showed that the pore size, permeability and surface roughness of the membrane increased with the increase of aggregate size, but the effluent quality of MBR was not affected in a large pore size range（0.11-1.30 μm）. During the operation of MBR, the transmembrane pressure growth rate of ceramic membrane prepared by 5 μm corundum was the lowest, and the membrane fouling resistance in the pore was the lowest, showing excellent anti-fouling performance. The analysis results of membrane surface foulants showed that the concentration of polysaccharides and proteins accumulated in the operation was the lowest, and the thickness of the fouled layer was the smallest and loose, which might be related to the improvement of microbial population structure in the fouled layer. This study proves that optimizing the aggregate size of hollow flat ceramic membrane is an effective method to improve the anti?fouling performance of MBR.
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