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高碘酸钠促进PG/PEI共沉积改性中空纤维曝气膜性能优化及稳定性研究

作者：李一心，周军浩，刘子强，吴强，王暄，吕晓龙，张萌萌，胡皓楠

单位：天津工业大学材料科学与工程学院，先进分离膜材料全国重点实验室，生物化工研究所，天津 300387

关键词：膜曝气生物膜反应器；疏水膜；邻苯三酚；聚乙烯亚胺；共沉积；高碘酸钠

DOI号： 10.16159/j.cnki.issn1007-8924.2025.03.018

分类号： TQ028.8

出版年,卷(期):页码： 2025,45(3):170-178

摘要：

膜曝气生物膜反应器（MABR）在废水处理中具有高效率、低成本和环境友好等优势，而膜材料作为MABR系统的核心部分，须具备优异的氧传质性能和稳定性。针对MABR研究中疏水性聚偏氟乙烯（PVDF）微孔膜在氧传质性能方面的不足以及稳定性较差等问题，本研究采用邻苯三酚（PG）和聚乙烯亚胺（PEI）体系对自制PVDF疏水性微孔膜进行表面共沉积改性，并引入高碘酸钠（SP）作为氧化剂。研究结果表明，改性膜较原膜亲水性提高，水接触角从89.7°下降到52.5°，泡点压力从8 kPa提升到66 kPa，氧转移系数从0.76×10-2 /min增加到1.47×10-2 /min（1.93倍），氧传质性能显著增强。此外，SP的引入显著缩短了共沉积时间并提高了改性膜稳定性，其中高盐环境下的稳定性能尤其优越。

The membrane aerated biofilm reactor (MABR) demonstrates high efficiency, cost-effectiveness, and environmental friendliness in wastewater treatment. As the core component of MABR systems, membrane materials require superior oxygen transfer performance and stability. To address the limitations of hydrophobic polyvinylidene fluoride (PVDF) microporous membranes in oxygen transfer efficiency and stability in existing MABR research, this study employed a surface co-deposition modification method using pyrogallol (PG) and polyethyleneimine (PEI) on self-made hydrophobic PVDF microporous membranes, with the introduction of sodium periodate (SP) as an oxidant. Results revealed that the modified membrane exhibited enhanced hydrophilicity compared to the original membrane, with the water contact angle decreasing from 89.7° to 52.5°, bubble point pressure increasing from 8 kPa to 66 kPa, and oxygen transfer coefficient rising from 0.76×10-2 /min to 1.47×10-2 /min (a 1.93-fold improvement), indicating significantly enhanced oxygen transfer performance. Furthermore, the addition of SP substantially reduced co-deposition time and improved membrane stability. Under ultrasonic treatment and in strong acid, neutral, strong alkaline, and high-salt solutions, the oxygen transfer performance decay rates of modified membranes without SP were 14.9%, 13.0%, 3.2%, 26.0%, and 24.7%, respectively. With SP addition, these decay rates decreased to 11.6%, 2.0%, 0.7%, 16.3%, and 3.4%, respectively, demonstrating improved stability across all conditions, with particularly superior performance in high-salt environments.

基金项目：

国家自然科学基金项目（51978466）；天津市科技计划项目（21ZYJDJC00050）

作者简介：

李一心（2000-），男，甘肃庆阳人，从事疏水性PVDF膜表面改性及MABR应用研究

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