State Key Laboratory of Separation Membranes and Membrane Processes, School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China.
MOE Key Laboratory of Pollution Processes and Environmental Criteria, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
Bioresour Technol. 2022 Sep;360:127527. doi: 10.1016/j.biortech.2022.127527. Epub 2022 Jun 25.
The present study operated the novel moving bed biofilm reactor-nanofiltration-membrane bioreactor (MBBR-NF-MBR) with loose polyamide NF membranes for the first time to treat roxithromycin (ROX) wastewater. Results showed that both MBBR-NF-MBRs achieved superior COD removal of 98.4% and 97.2% and excellent removal of ROX at 74.1% and 65.5%, respectively. The main membrane fouling mechanism was reversible fouling caused by the combination of abundant polysaccharides, proteins and Ca-P precipitates, which could be effectively removed by acidic cleaning. Sorption and biodegradation were the main removal routes of ROX in MBBR. Partial retention of loose NF membrane contributed to microbial metabolism and increased microbial diversity, especially the genera Hyphomicrobium in attached biofilm, which was reasonable for ROX removal. The cleavage of cladinose, demethylation, phosphorylation and β-oxidation in macrolactone ring were the main biotransformation reactions of ROX. This study provides novel insights for micropollutants wastewater treatment by using loose NF membrane in MBR.
本研究首次采用新型移动床生物膜反应器-纳滤膜-膜生物反应器（MBBR-NF-MBR），采用疏松聚酰胺 NF 膜处理罗红霉素（ROX）废水。结果表明，MBBR-NF-MBR 均实现了优异的 COD 去除率（98.4%和 97.2%）和对 ROX 的良好去除率（74.1%和 65.5%）。主要的膜污染机制是由丰富的多糖、蛋白质和 Ca-P 沉淀物共同作用引起的可逆污染，可以通过酸性清洗有效地去除。吸附和生物降解是 ROX 在 MBBR 中的主要去除途径。疏松 NF 膜的部分截留有助于微生物代谢并增加微生物多样性，特别是附着生物膜中的 Hyphomicrobium 属，这有利于 ROX 的去除。ROX 的主要生物转化反应为克拉定糖的裂解、去甲基化、磷酸化和β-氧化。本研究为利用 MBR 中疏松 NF 膜处理微污染物废水提供了新的见解。
