生物滴滤塔净化甲苯废气的研究

Study on Purification of Toluene Waste Gas withBiotrickling Filter

在生物滴滤塔中对低质量浓度甲苯废气的脱除进行实验研究。采用经处理后的燃煤锅炉烧结的炉渣作为生物滴滤塔填料 ,选育有降解甲苯能力的微生物对填料进行挂膜。实验结果表明 ,入口甲苯的质量浓度低于 1 1 .7mg/L时 ,甲苯的净化率可保持在 97%以上 ,但超过 1 1 .7mg/L时 ,净化率迅速下降。微生物对甲苯的最大生化降解量可达 2 4 5.3mg/(L·h)。随停留时间的增大 ,甲苯的净化率和生化降解量增大 ;停留时间增加到 2 .6min时 ,生化降解量迅速下降。

Toluene removal from gas stream is investigated in a biotrickling filter. The packing of the filter is the blast furnace slag. The bacterium that can degrade toluene was selected and cultured and then the bacterium was transferred to the filter and formed a biofilm on the surface of the packing. The results indicate that when the inlet concentration is lower than 11.4 mg/L, the capacity of toluene elimination can be up to 245.3 mg/(L·h) and efficiency more than 97 %. If the concentration is over the value, the elimination efficiency decreases sharply. The elimination efficiency and the capacity of toluene elimination increase with the increase of the residence time. When the residence time is up to 2.6 minutes, the capacity of toluene elimination decreases sharply. The nutrient supplement is very essential to maintain the high elimination efficiency and the longtime run of the system.