Department of Science and High Technology, Università degli Studi dell'Insubria, Via G. B Vico 46, 21100, Varese, Italy.
School of Industrial Engineering, University LIUC-Cattaneo, Corso Matteotti 22, I-21053, Castellanza, VA, Italy.
Environ Sci Pollut Res Int. 2017 Oct;24(29):23207-23218. doi: 10.1007/s11356-017-9968-3. Epub 2017 Aug 22.
Polluted air streams can be purified using biological treatments such as biotrickling filtration, which is one of the most widely accepted techniques successfully tuned to treat a wide variety of exhausted gaseous streams coming from a series of industrial sectors such as food processing, flavor manufacturers, rendering, and composting. Since the degradation of a pollutant occurs at standard pressure and temperature, biotrickling filtration, whether compared with other more energy-demanding chemical-physical processes of abatement (such as scrubbing, catalytic oxidation, regenerative adsorption, incineration, advanced oxidation processes, etc.), represents a very high energy-efficient technology. Moreover, as an additional advantage, biodegradation offers the possibility of a complete mineralization of the polluting agents. In this work, biotrickling filtration has been considered in order to explore its efficiency with respect to the abatement of ammonia (which is a highly water-soluble compound). Moreover, a complete mathematical model has been developed in order to describe the dynamics of both absorption and biological activities which are the two dominant phenomena occurring into these systems. The results obtained in this work have shown that the absorption phenomenon is very important in order to define the global removal efficiency of ammonia from the gaseous stream (particularly, 44% of the ammonia is abated by water absorption). Moreover, it has been demonstrated (through the comparison between experimental results and theoretical simulations) that the action of bacteria, which enhance the rate of ammonia transfer to the liquid phase, can be modeled through a simple Michaelis-Menten relationship.
受污染的空气流可以通过生物处理进行净化，例如生物滴滤过滤，这是一种被广泛接受的技术，可以成功地处理来自食品加工、香料制造商、炼油和堆肥等一系列工业部门的各种废气流。由于污染物的降解是在标准压力和温度下进行的，因此与其他更耗能的化学物理减排工艺（如洗涤、催化氧化、再生吸附、焚烧、高级氧化工艺等）相比，生物滴滤过滤代表了一种非常高效的节能技术。此外，作为额外的优势，生物降解提供了完全矿化污染物的可能性。在这项工作中，考虑了生物滴滤过滤，以探索其在去除氨（一种高度水溶性化合物）方面的效率。此外，还开发了一个完整的数学模型，以描述这两个主导现象在这些系统中的吸收和生物活性动力学。这项工作的结果表明，吸收现象对于定义从气体流中去除氨的总去除效率非常重要（特别是，氨的 44%通过水吸收被去除）。此外，通过实验结果和理论模拟之间的比较表明，可以通过简单的米氏方程关系来模拟增强氨向液相转移速率的细菌的作用。
