Kim Daekeun, Sorial George A
Department of Civil and Environmental Engineering, University of Cincinnati, 765G Baldwin Hall, Cincinnati, OH 45221-0071, United States.
Chemosphere. 2007 Jan;66(9):1758-64. doi: 10.1016/j.chemosphere.2006.06.069. Epub 2006 Aug 7.
The effects of temporal and spatial changes in biological activity and biomass amount on biofilter performance were investigated in a lab-scale trickle-bed air biofilter at a toluene loading of 46.9gm(-3)h(-1) under two different experimental strategies, namely, periodic backwashing at a rate of 1h once a week and 2d starvation. Analysis of the overall reaction for toluene metabolism revealed that cell synthesis was relatively favored over toluene oxidation in the inlet section of the biofilter, but over time its oxidation became favored throughout the biofilter bed. Periodic in situ backwashing with media fluidization effectively made even spatial distribution of biomass along the bed media, by which consistent high removal performance in the biofilter has been attained. After 2d starvation, the ratio of the biofilm EPS to the total biomass increased along the media bed depth, while the total biomass in the media bed subsequently decreased. The presence of sufficient biomass and microbial activity favorably influenced biofilter reacclimation after restart-up following starvation.
在实验室规模的滴流床空气生物滤池中，在甲苯负荷为46.9g m⁻³ h⁻¹的条件下，采用两种不同的实验策略，即每周一次以1小时的速率进行周期性反冲洗和2天饥饿处理，研究了生物活性和生物量的时空变化对生物滤池性能的影响。对甲苯代谢的整体反应分析表明，在生物滤池的入口部分，细胞合成相对于甲苯氧化更受青睐，但随着时间的推移，其氧化在整个生物滤池床中变得更受青睐。通过介质流化进行周期性原位反冲洗有效地使生物量沿床层介质均匀分布，从而在生物滤池中实现了持续的高去除性能。经过2天饥饿处理后，生物膜胞外聚合物与总生物量的比率沿介质床深度增加，而介质床中的总生物量随后减少。充足的生物量和微生物活性的存在对饥饿后重启的生物滤池再适应产生了有利影响。
