Ferdowsi Milad, Khabiri Bahman, Buelna Gerardo, Jones J Peter, Heitz Michèle
Department of Chemical Engineering and Biotechnological Engineering, Faculty of Engineering, Université de Sherbrooke, Sherbrooke, Quebec, Canada.
Crit Rev Biotechnol. 2023 Dec;43(7):1019-1034. doi: 10.1080/07388551.2022.2100735. Epub 2022 Aug 24.
Hazardous airborne pollutants are frequently emitted to the atmosphere in the form of a gaseous mixture. Air biofilters as the primary biotechnological choice for waste gas treatment (low inlet concentration and high gas flow rate) should run properly when the feed contains multiple pollutants. Simultaneous removal of pollutants in biofilters has been extensively studied over the last 10 years. In this review, the results and findings of the mentioned studies including different groups of pollutants, such as methane (CH) and volatile organic compounds (VOCs) are discussed. As the number of pollutants in a mixture increases, their elimination might become more complicated due to interactions between the pollutants. Parallel batch studies might be helpful to better understand these interaction effects in the absence of mass transfer limitations. Setting optimum operating conditions for removal of mixtures in biofilters is challenging because of opposing properties of pollutants. In biofilters, concerns, such as inlet gas composition variation and stability while dealing with abrupt inlet load and concentration changes, must be managed especially at industrial scales. Biofilters designed with multi-layer beds, allow tracking the fate of each pollutant as well as analyzing the diversity of microbial culture across the filter bed. Certain strategies are recommended to improve the performance of biofilters treating mixtures. For example, addition of (bio)surfactants as well as a second liquid phase in biotrickling filters might be considered for the elimination of multiple pollutants especially when hydrophobic pollutants are involved.
有害空气污染物经常以气体混合物的形式排放到大气中。作为废气处理（低入口浓度和高气体流速）的主要生物技术选择，当进料含有多种污染物时，空气生物滤池应能正常运行。在过去10年中，对生物滤池中污染物的同时去除进行了广泛研究。在这篇综述中，讨论了上述研究的结果和发现，包括不同组别的污染物，如甲烷（CH）和挥发性有机化合物（VOCs）。随着混合物中污染物数量的增加，由于污染物之间的相互作用，它们的去除可能会变得更加复杂。平行批次研究可能有助于在不存在传质限制的情况下更好地理解这些相互作用效应。由于污染物的性质相互对立，为生物滤池中混合物的去除设定最佳操作条件具有挑战性。在生物滤池中，必须处理诸如入口气体成分变化和应对突然的入口负荷及浓度变化时的稳定性等问题，尤其是在工业规模上。设计有多层床的生物滤池，能够追踪每种污染物的去向，并分析整个滤床中微生物培养的多样性。建议采用某些策略来提高生物滤池处理混合物的性能。例如，在生物滴滤池中添加（生物）表面活性剂以及第二液相可能有助于去除多种污染物，尤其是当涉及疏水性污染物时。
