生物滴滤器净化苯/甲苯废气的对比

在不同模拟工况下研究生物滴滤器对低浓度苯、甲苯气体的净化性能.以苯和甲苯为目标污染物,采用陶瓷拉西环作为生物滴滤器填料,选用先期筛选驯化的苯、甲苯专性降解菌种对填料进行接种挂膜.结果表明:在气体流量为60～150L/h(对应的苯、甲苯停留时间分别为11.25～28.12s和10.6～26.4s),苯、甲苯入口气体浓度分别为0.61～4.14g/m3,0.43～4.40g/m3的条件下,生物滴滤器对苯、甲苯的最大生化去除负荷分别为333g/(m3.h)和593.4g/(m3.h),甲苯与苯相比更易被微生物降解,镜检表明苯、甲苯系统生物膜中的优势菌种都为短杆菌,密度分别达2.3×109CFU/ml和1.52×1011CFU/ml.

Treatment of benzene and toluene waste gas by bio-trickling filter

In order to research the purification capability of bio-trickling filter under different working conditions,benzene and toluene waste gas were used as target pollutants,ceramic Raschig rings were employed as packing material,and a suitable microflora with high conversion capacity for the recalcitrant benzene and toluene was selected. Results of experiments indicate that when the entrance concentrations of benzene and toluene are 0.61-4.14 g/m3 and 0.43-4.40 g/m3,the air flows are 60-150 L/h(resident time is 11.25-28.12 s,10.6-26.4 s,respectively),the maximum elimination capacity (EC) can reach 333 g/(m3·h) and 593.4 g/(m3·h) respectively,which shows that the toluene is degraded better than benzene.The observation of biotic community demonstrates that the Pseudomonas putida is the dominant bacterium in both of benzene and toluene systems.