利用二氧化硅微粒增强混合生物反应器中的氧气传质

Matheus M. Pereira, Ivus Lorenzo Oliveira Matos, Filipe Moreira Mascarenhas Cordeiro, Ana Cristina Morais da Silva, Eliane Bezerra Cavalcanti, Á. S. Lima
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摘要

这项研究旨在提高混合反应器中的氧传递质量系数(kLa),首先评估了搅拌和曝气的效果,然后评估了二氧化硅微粒的大小和浓度的影响。通过粒度分布、扫描电子显微镜、XRD、EDS、FTIR、TG/DTA 和 BET 对溶胶凝胶技术合成的二氧化硅、商用砂和海滩砂进行了表征。颗粒的平均值约为 9.2、76.9、165.1 和 364.4 微米,表面不规则,粗糙度也各不相同。二氧化硅溶胶凝胶是无定形的,而海滩砂和商用砂则具有由硅、氧和碳残留物组成的晶体结构。与其他二氧化硅微粒相比,二氧化硅溶胶凝胶的质量损失和表面积更大,质量损失更小,表面积更小。增加通气和搅拌以及添加二氧化硅微粒都能改善 kLa。使用浓度为 1.0 g L-1 (二氧化硅溶胶-凝胶)和 2.0 g L-1 (商用砂和处理过的海滩砂)的二氧化硅微粒时,kLa 值最佳,浓度约为 75 µm。这项工作中使用的所有二氧化硅微粒都能改善混合生物反应器的传质性能。
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Enhanced Oxygen Mass Transfer in Mixing Bioreactor Using Silica Microparticles
This work aimed to improve the oxygen transfer mass coefficient (kLa) in mixing reactors, first evaluating the effect of agitation and aeration and then evaluating the influence of the size and concentration of silica microparticles. Silicon dioxide synthesized via the sol-gel technique, commercial sand, and beach sand were characterized by particle size distribution, scanning electron microscopy, XRD, EDS, FTIR, TG/DTA, and BET. The particles presented average values of approximately 9.2, 76.9, 165.1, and 364.4 µm, with irregular surfaces and different roughness. Silica sol-gel is amorphous while beach and commercial sand have a crystalline structure consisting of silicon, oxygen, and carbon residues. Silica sol-gel presents a higher loss of mass and surface area than other silica microparticles, with a shallow mass loss and a smaller surface. Increasing aeration and agitation improves the kLa, as well as adding silica microparticles. The best kLa was found using silica microparticles with approximately 75 µm concentrations of 1.0 g L−1 (silica sol-gel) and 2.0 g L−1 (commercial and treated beach sand). All silica microparticles used in this work improve mass transfer performance in mixing bioreactors.
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