Environmental Engineering Program, School of Energy, Environmental, Biological, and Medical Engineering, College of Engineering and Applied Science, University of Cincinnati, Cincinnati, OH, USA.
J Air Waste Manag Assoc. 2011 Feb;61(2):201-10. doi: 10.3155/1047-3289.61.2.201.
Trickle-bed air biofilters (TBABs) are suitable for treatment of hydrophilic volatile organic compounds, but they pose a challenge for hydrophobic compounds. Three laboratory-scale TBABs were used for the treatment of an airstream contaminated with different ratios of n-hexane and benzene mixtures. The ratios studied were 1:1, 2:1, and 1:3 n-hexane:benzene by volume. Each TBAB was operated at a pH of 4 and a temperature of 20 degrees C. The use of acidic-buffered nutrient solution was targeted for changing the microorganism consortium to fungi as the main biodegradation element. The experimental plan was designed to investigate the long-term performance of the TBABs with an emphasis on different mixture loading rates, removal efficiency with TBAB depth, volatile suspended solids, and carbon mass balance closure. n-Hexane loading rate was kept constant in the TBABs for comparison reasons and ranged from 4 to 22 g/(m3 x hr). Corresponding benzene loadings ranged from 4 to 43 g/(m3 x hr). Generally, benzene behavior in the TBAB was superior to that of n-hexane because of its higher solubility. n-Hexane showed improved performance in the 2:1 mixing ratio as compared with the other two ratios.
滴滤床空气生物滤池（TBAB）适用于处理亲水性挥发性有机化合物，但对疏水性化合物则构成挑战。使用三个实验室规模的 TBAB 来处理含有不同比例正己烷和苯混合物的气流。研究的比例为体积比 1:1、2:1 和 1:3 的正己烷：苯。每个 TBAB 的操作 pH 值为 4，温度为 20°C。使用酸性缓冲营养溶液的目的是将微生物群落改变为真菌，作为主要的生物降解元素。实验计划旨在研究 TBAB 的长期性能，重点是不同的混合物加载速率、TBAB 深度的去除效率、挥发性悬浮固体和碳质量平衡闭合。为了进行比较，TBAB 中的正己烷加载速率保持不变，范围为 4 至 22 g/（m3 x hr）。相应的苯负载范围为 4 至 43 g/（m3 x hr）。通常，由于苯的溶解度较高，其在 TBAB 中的行为优于正己烷。与其他两个比例相比，2:1 混合比例中的正己烷表现出更好的性能。
