Biochar-driven fouling mitigation in sustainable microalgal-bacterial membrane bioreactors

IF 8.4 1区工程技术 Q1 ENGINEERING, CHEMICAL

Journal of Membrane Science Pub Date : 2024-10-16 DOI:10.1016/j.memsci.2024.123427

Fei Huang , Jiaheng Teng , Yu Zhao , Shangfei Li , Hongjun Lin , Xiang Cai , Meijia Zhang

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Abstract

Microalgal-bacterial membrane bioreactor (MB-MBR) have emerged as a crucial technology for sustainable wastewater treatment. However, membrane fouling caused by free microalgae remains a major obstacle to their cost-effective operation. This study investigated the impact of biochar addition on membrane fouling in MB-MBR. The findings indicated that biochar significantly reduced membrane fouling, primarily due to the enlargement of floc size and the reduction of soluble microbial products (SMP). Detailed analyses suggested that biochar's adsorptive properties and its effect on decreasing the abundance of algae and bacteria species, such as Proteobacteria and Leptolyngbya, which promote fouling, are key factors. This alteration enhanced specific amino acid metabolic pathways, thereby reducing SMP production and fouling potential. Consequently, adhesion interaction energy of the flocs and membrane fouling were both diminished. This study demonstrated that biochar addition is an effective strategy for mitigating membrane fouling in MB-MBR systems, providing a theoretical foundation for their stable and sustainable operation.

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生物炭驱动的可持续微藻-细菌膜生物反应器污垢缓解技术

微藻-细菌膜生物反应器（MBR）已成为可持续废水处理的一项重要技术。然而，游离微藻造成的膜堵塞仍然是其经济高效运行的主要障碍。本研究调查了生物炭的添加对 MB-MBR 膜堵塞的影响。研究结果表明，生物炭能显著减少膜堵塞，这主要是由于絮凝物尺寸增大和可溶性微生物产物（SMP）减少。详细的分析表明，生物炭的吸附特性及其对减少藻类和细菌（如变形杆菌和鳞状杆菌）数量的影响是造成污垢的关键因素。这种改变增强了特定的氨基酸代谢途径，从而减少了 SMP 的产生，降低了产生污垢的可能性。因此，絮凝体的粘附相互作用能和膜污垢都减少了。这项研究表明，添加生物炭是减轻 MB-MBR 系统膜污垢的有效策略，为其稳定和可持续运行提供了理论基础。

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来源期刊

Journal of Membrane Science 工程技术-高分子科学

CiteScore

17.10

自引率

17.90%

发文量

1031

审稿时长

2.5 months

期刊介绍： The Journal of Membrane Science is a publication that focuses on membrane systems and is aimed at academic and industrial chemists, chemical engineers, materials scientists, and membranologists. It publishes original research and reviews on various aspects of membrane transport, membrane formation/structure, fouling, module/process design, and processes/applications. The journal primarily focuses on the structure, function, and performance of non-biological membranes but also includes papers that relate to biological membranes. The Journal of Membrane Science publishes Full Text Papers, State-of-the-Art Reviews, Letters to the Editor, and Perspectives.