State Key Laboratory of Separation Membranes and Membrane Processes, TianGong University, Tianjin 300387, China; School of Material Science and Engineering, TianGong University, Tianjin 300387, China.
State Key Laboratory of Separation Membranes and Membrane Processes, TianGong University, Tianjin 300387, China; School of Environmental Science and Engineering, TianGong University, Tianjin 300387, China.
Chemosphere. 2022 Jul;299:134355. doi: 10.1016/j.chemosphere.2022.134355. Epub 2022 Mar 16.
The practical applications of water treatment techniques based on hydrophobic aeration membrane are limited due to membrane pores blocking. Various studies have revealed that both biofilm and microbial secretion can exacerbate membrane fouling. Recently, we constructed a membrane-aerated biofilm reactor (MABR) system for treating micro-polluted surface water in order to identify the primary cause for oxygen transfer rate (OTR) decline. It was found that microbial secretion had a more prominent negative effect than that caused by biofilm, as manifested by the fact the effect of microbial secretion (66.49%) was greater than the resistance of biofilm (38.83%). Fouling decreased the total pore volume of all membrane. The peak location of adsorption capacity was more likely to occur at smaller pore sizes with longer running time. Notably, continuous fluorescence distribution between the separating layer and pores like finger in MABR system exhibited an increasing trend with the operation time, indicating a gradual increase of microbial viability. Core protein structure was revealed by different bond peaks (0-90 d). Specifically, for different organic components of EPS, the hydrophilic HIS was the main content, while the mass transfer resistance caused by the gel increased, which reduced the contact angle and increased the bubble point pressure. Therefore, effects of EPS content and composition should be considered during the application of water treatment techniques based on MABR.
基于疏水性曝气膜的水处理技术的实际应用受到膜孔堵塞的限制。各种研究表明，生物膜和微生物分泌都会加剧膜污染。最近，我们构建了一种膜曝气生物膜反应器（MABR）系统，用于处理微污染地表水，以确定氧转移率（OTR）下降的主要原因。结果发现，微生物分泌对 OTR 的负面影响比生物膜更大，这表现为微生物分泌的影响（66.49%）大于生物膜的阻力（38.83%）。污染降低了所有膜的总孔体积。随着运行时间的延长，吸附容量的峰值位置更容易出现在较小的孔径上。值得注意的是，MABR 系统中分离层和孔之间连续的荧光分布随着运行时间呈现出增加的趋势，表明微生物的活力逐渐增加。不同键峰（0-90d）揭示了核心蛋白结构。具体来说，对于 EPS 的不同有机成分，亲水性 HIS 是主要成分，而凝胶引起的传质阻力增加，降低了接触角并增加了气泡点压力。因此，在基于 MABR 的水处理技术的应用中，应考虑 EPS 含量和组成的影响。
