Environmental Engineering Department, Istanbul Technical University, Maslak, 34469, Istanbul, Turkey; Science and Advanced Technologies Application and Research Center (BILTAM), Istanbul Medeniyet University, Istanbul, 34700, Turkey.
Science and Advanced Technologies Application and Research Center (BILTAM), Istanbul Medeniyet University, Istanbul, 34700, Turkey; Department of Bioengineering, Istanbul Medeniyet University, Istanbul, 34700, Turkey.
J Environ Manage. 2024 May;358:120845. doi: 10.1016/j.jenvman.2024.120845. Epub 2024 Apr 9.
High-rate membrane bioreactors (MBR), where the wastewater undergoes partial oxidation due to the applied short sludge retention time (SRT) and hydraulic retention time (HRT) values, retain the majority of the organic substances in the sludge through growth and biological flocculation. Thus, a raw material source with a high biomethane production potential is created for the widespread use of circular economy or energy-neutral plants in wastewater treatment. While high-rate MBRs have been successfully employed for energy-efficient treatment of domestic wastewater, there is a lack of research specifically focused on textile wastewater. This study aimed to investigate the textile wastewater treatment and organic matter recovery performances of an aerobic MBR system containing a hollow fiber ultrafiltration membrane with a 0.04 μm pore diameter. The system was initially operated at short SRTs (5 and 3 d) and different SRT/HRT ratios (5, 10, and 20) and subsequently at high-rate conditions (SRT of 0.5-2 d and HRT of 1.2-9.6 h) which are believed to be the most limiting conditions tested for treatment of real textile wastewater. The results showed that chemical oxygen demand (COD) removal averaged 77% even at SRT of 0.5 d and HRT of 1.2 h. Slowly biodegradable substrates and soluble microbial products (SMP) accumulated within the MBR at SRT of 0.5 and 1 d, which resulted in decreased sludge filterability. The observed sludge yield (Y) exhibited a considerable increase when SRT was reduced from 5 to 1 d. On the other hand, the SRT/HRT ratio displayed a decisive effect on the energy requirement for aeration.
高负荷膜生物反应器（MBR）通过施加较短的污泥停留时间（SRT）和水力停留时间（HRT）值，使废水发生部分氧化，从而通过生长和生物絮凝保留污泥中的大部分有机物质。因此，为了广泛应用循环经济或能源中立型工厂处理废水，创造了具有高生物甲烷生产潜力的原料来源。虽然高负荷 MBR 已成功用于高效处理生活污水，但针对纺织废水的研究却相对较少。本研究旨在探讨一种含有 0.04μm 孔径的中空纤维超滤膜的好氧 MBR 系统对纺织废水的处理和有机物回收性能。该系统最初在短 SRT（5 和 3d）和不同的 SRT/HRT 比（5、10 和 20）下运行，随后在高负荷条件（SRT 为 0.5-2d 和 HRT 为 1.2-9.6h）下运行，这被认为是处理实际纺织废水的最具限制条件。结果表明，即使在 SRT 为 0.5d 和 HRT 为 1.2h 的条件下，COD 去除率也平均达到了 77%。在 SRT 为 0.5 和 1d 时，MBR 内积累了缓慢生物降解的底物和可溶微生物产物（SMP），导致污泥过滤性能下降。当 SRT 从 5d 降低到 1d 时，观察到的污泥产率（Y）显著增加。另一方面，SRT/HRT 比对曝气的能源需求有决定性的影响。
