Cox H H, Nguyen T T, Deshusses M A
Department of Chemical and Environmental Engineering, University of California, Riverside 92521, USA.
Appl Microbiol Biotechnol. 2000 Jul;54(1):133-7. doi: 10.1007/s002530000346.
Pollutant degradation in biotrickling filters for waste air treatment is generally thought to occur only in the biofilm. In two experiments with toluene degrading biotrickling filters, we show that suspended microorganisms in the recycle liquid may substantially contribute to the overall pollutant removal. Two days after reactor start up, the overall toluene elimination capacity reached a maximum of 125 g m(-3) h(-1), which was twice that found during prolonged operation. High biodegradation activity in the recycle liquid fully accounted for this short-term peak of pollutant elimination. During steady-state operation, the toluene degradation in the recycle liquid was 21% of the overall elimination capacity, although the amount of suspended biomass was only 1% of the amount of immobilized biomass. The results suggest that biotrickling filter performance may be improved by selecting operating conditions allowing for the development of an actively growing suspended culture.
用于废气处理的生物滴滤池中，污染物降解通常被认为仅发生在生物膜中。在两项关于甲苯降解生物滴滤池的实验中，我们表明循环液中的悬浮微生物可能对整体污染物去除有显著贡献。反应器启动两天后，整体甲苯去除能力最高达到125 g m(-3) h(-1)，这是长期运行期间的两倍。循环液中的高生物降解活性充分解释了污染物去除的这一短期峰值。在稳态运行期间，尽管悬浮生物质的量仅为固定化生物质量的1%，但循环液中的甲苯降解量占整体去除能力的21%。结果表明，通过选择允许发展活跃生长的悬浮培养物的操作条件，可以提高生物滴滤池的性能。
