Institute of Resources and Environmental Engineering, Shanxi University, Taiyuan, 030006, China.
College of Environment and Resource Sciences, Shanxi University, Taiyuan, 030006, China.
Chemosphere. 2024 Aug;362:142582. doi: 10.1016/j.chemosphere.2024.142582. Epub 2024 Jun 11.
This investigation elucidates the influence of micron-scale aeration bubbles on the improvement of anti-fouling characteristics within submerged membrane bioreactors (sMBRs). A systematic examination of sludge properties, hydraulic dynamics, and fouling tendencies revealed that the application of microbubble aeration, specifically at dimensions of 100 μm, 80 μm, and 30 μm, significantly reduced sludge electrostatic repulsion and augmented particle size distribution, as opposed to the utilization of coarse bubble aeration of 1 mm. Notably, the employment of 100 μm bubbles achieved a significant reduction in the proportion of smaller particles (<10 μm) and sludge viscosity, thereby facilitating a more homogenous and vigorous turbulence at the membrane interface. These optimized conditions were instrumental in the substantial reduction of membrane fouling, which was corroborated by the diminished rate of fouling, reduced resistance accumulation, and lesser foulant deposition. The investigation identified sludge particle size, turbulent kinetic energy, and shear stress as the predominant factors influencing the development of membrane fouling. The findings underscore the pronounced advantages of employing 100 μm-sized bubbles in aeration strategies, providing enhanced understanding for the optimization of aeration parameters to improve sMBR efficiency and maintenance.
本研究阐明了微米级曝气气泡对改善浸没式膜生物反应器（sMBR）抗污特性的影响。通过系统地研究污泥特性、水力动力学和污染倾向，发现与使用 1 毫米的粗气泡曝气相比，微气泡曝气（特别是 100μm、80μm 和 30μm 尺寸的微气泡曝气）显著降低了污泥静电排斥并增加了颗粒尺寸分布。值得注意的是，使用 100μm 气泡可显著减少小于 10μm 的颗粒比例和污泥黏度，从而在膜界面处产生更均匀和强烈的湍流。这些优化条件有助于显著减少膜污染，这一点得到了污染速率降低、阻力积累减少和污染物沉积减少的证实。研究确定了污泥颗粒大小、湍流动能和剪切应力是影响膜污染发展的主要因素。研究结果强调了在曝气策略中使用 100μm 大小气泡的明显优势，为优化曝气参数以提高 sMBR 效率和维护提供了更深入的理解。
