Fe3O4@PANI composite improves biotransformation of waste activated sludge into medium-chain fatty acid

IF 23.2 2区材料科学 Q1 MATERIALS SCIENCE, COMPOSITES Advanced Composites and Hybrid Materials Pub Date : 2024-06-29 DOI:10.1007/s42114-024-00919-1

Qiaoling Lu, Junyan Lu, Dezhi Sun, Bin Qiu

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Abstract

Core–shell structured Fe₃O₄@PANI composite was prepared using a chemical oxidation polymerization method and used as the bio-carrier to enhance the biotransformation of waste activated sludge to produce medium-chain fatty acid by anaerobic fermentation. The synthesized composite had stable chemical properties and good biological affinity. The addition of Fe₃O₄@PANI can effectively promote the acidogenesis and chain elongation in the fermentation system. When 1 g/L of Fe₃O₄@PANI was added, the acid production from the fermentation system increased by up to 1.9 times, and the maximum acid production rate increased by 3.4 times. Meanwhile, the production of caproate increased by 2.79 times. It was demonstrated that the added Fe₃O₄@PANI facilitated the release of organic compounds from bacterial cells and improved the electrical activity of the sludge system, thereby accelerating the chain elongation to generate caproate. Moreover, the addition of Fe₃O₄@PANI can effectively enrich the functional microbes related to chain elongation, including Clostridium sensu stricto 12, Dechloromonas, Romboutsia, and IMCC26207.

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Fe3O4@PANI复合材料可促进废物活性污泥向中链脂肪酸的生物转化

采用化学氧化聚合法制备了核壳结构的Fe3O4@PANI复合材料，并将其作为生物载体，通过厌氧发酵促进废弃活性污泥生产中链脂肪酸的生物转化。合成的复合材料具有稳定的化学性质和良好的生物亲和性。Fe3O4@PANI的加入能有效促进发酵体系中的酸生成和链延伸。当添加 1 g/L Fe3O4@PANI 时，发酵体系的产酸量增加了 1.9 倍，最大产酸率增加了 3.4 倍。同时，己酸的产量增加了 2.79 倍。研究表明，添加的 Fe3O4@PANI 促进了细菌细胞释放有机化合物，提高了污泥系统的电活性，从而加速了链的伸长，生成了己酸酯。此外，添加 Fe3O4@PANI 还能有效富集与链延长相关的功能微生物，包括严格意义上的 12 号梭菌、脱氯单胞菌、隆布氏菌和 IMCC26207。

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来源期刊

Advanced Composites and Hybrid Materials Multiple-

CiteScore

26.00

自引率

21.40%

发文量

185

期刊介绍： Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.