Department of Chemical Engineering and Environmental Technology, University of Valladolid, Paseo del Prado de la Magdalena s/n, 47011 Valladolid, Spain.
Water Res. 2010 Jul;44(13):3905-14. doi: 10.1016/j.watres.2010.05.008.
The robustness of a conventional biofilter and an air diffusion bioreactor (ADB) was comparatively evaluated in laboratory-scale plants treating a mixture of H2S, butanone, toluene and alpha-pinene at gas residence times of 50 s. Under steady state conditions, H2S, butanone and toluene were almost completely degraded, while alpha-pinene removal did not exhibit removal efficiencies (REs) higher than 11.0 +/- 2.3%. Fluctuations in temperature from 8 degrees C to 30 degrees C did not impact significantly process performance in any of the biotechnologies tested. However, while the ADB unit was able to cope with three and six fold step increases in pollutant loadings, volatile organic compounds (VOCs) REs noticeably decreased in the biofilter when subjected to a six fold step change (i.e. 90% reduction for butanone and 30% for toluene). A process shutdown of five days resulted in the temporary loss of butanone and toluene RE in the ADB system. A lack of irrigation during five days caused a slight decrease in the biofilter REs, while a failure in the pH control system drastically affected the ADB performance. Finally, process robustness was quantified. The calculated overall risks showed that both biotechnologies were reliable for H2S and VOCs treatment in wastewater treatment plants, ADB diffusion exhibiting a higher robustness towards fluctuations commonly found under routine operation. This robustness was further confirmed by the high stability of the DGGE profiles.
在实验室规模的设备中，比较了传统生物滤池和空气扩散生物反应器（ADB）处理 H2S、丁酮、甲苯和α-蒎烯混合物的稳定性。在稳定状态条件下，H2S、丁酮和甲苯几乎完全降解，而α-蒎烯的去除效率（RE）没有超过 11.0 ± 2.3%。温度从 8°C 波动到 30°C，在测试的任何一种生物技术中都没有对工艺性能产生显著影响。然而，当污染物负荷增加三倍和六倍时，ADB 单元能够应对，但当生物滤池受到六倍的负荷变化（即丁酮减少 90%，甲苯减少 30%）时，挥发性有机化合物（VOC）的 RE 明显下降。五天的工艺停机导致 ADB 系统中丁酮和甲苯的 RE 暂时损失。五天不灌溉导致生物滤池的 RE 略有下降，而 pH 控制系统的故障则严重影响了 ADB 的性能。最后，对工艺的稳健性进行了量化。计算出的总体风险表明，这两种生物技术都适用于污水处理厂的 H2S 和 VOC 处理，ADB 扩散对常规操作中常见的波动表现出更高的稳健性。这一稳健性进一步得到了 DGGE 图谱高度稳定性的证实。
