本研究报道了磁场(MF)强度对己烷蒸气生物过滤的影响。在40gm-3h-1的固定入口负荷下,使用范围为0至30mT(millitesla)的MF评估了191天的己烷生物过滤。使用由亥姆霍兹线圈产生的均匀MF。根据去除效率(RE)评估反应器的性能,消除能力(EC),生物量含量,和胞外多糖(EPS)生产。最大去除效率为25%,36%,和40%被发现为对照(H0),10mT(H10),和30mT(H30)反应堆,分别对应于14.2、15和18gm-3h-1的ECs。在最后一个时期(第94至162天),与Ho相比,H10和H30显示出40%的RE改善。此外,对于暴露于MF的生物过滤器,清除过程一直沿着生物反应器的高度进行。反应器的总生物量含量分别为152、180和147mgVS(挥发性固体)g-1H0,H10和H30的干珍珠岩,与EPS产生30、30和40毫克EPSg-1VS相关。受MF影响的EPS的主要成分是碳水化合物和葡萄糖醛酸;蛋白质受影响较小。4和2h的MF脉冲实验证实,MF暴露提高了己烷的去除效率,在脉搏之后,去除增强维持5天。因此,通过脉冲施加MF可能是一种经济且友好的技术,可以改善挥发性有机化合物(VOC)的RE。
The present study reports on the effect of magnetic field (MF) intensity on the biofiltration of hexane vapors. MF ranging from 0 to 30 mT (millitesla) was used to evaluate the biofiltration of hexane for 191 days under a fixed inlet load of 40 g m-3 h-1. A homogeneous MF generated by Helmholtz coils was used. The performance of the reactors was evaluated in terms of removal efficiency (RE), elimination capacity (EC), biomass content, and exopolysaccharide (EPS) production. Maximal removal efficiencies of 25%, 36%, and 40% were found for the control (H0), 10 mT (H10), and 30 mT (H30) reactors, corresponding to ECs of 14.2, 15, and 18 g m-3 h-1, respectively. In the last period (days 94 to 162), H10 and H30 showed 40% of RE improvement compared with Ho. Also, the removal occurred all along the bioreactor height for biofilters exposed to MF. Reactors achieved a total biomass content of 152, 180, and 147 mg VS (volatile solids) g-1 dry perlite for H0, H10, and H30, correspondingly, associated with EPS production of 30, 30, and 40 mg EPS g-1 VS. The main components of EPS affected by the MF were carbohydrates and glucuronic acid; proteins were slightly affected. Experiments with MF pulses of 4 and 2 h confirmed that MF exposure improved the removal efficiency of hexane, and after the pulse, removal enhancement was maintained for 5 days. Thus, the MF application by pulses could be an economically and friendly technology to improve the RE of volatile organic compounds (VOCs).