生物滴滤器净化苯/甲苯废气的对比

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

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.

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 tolu- ene 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 gc/（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.