基于包埋功能微生物的生物滤塔净化甲苯废气研究

Biodegradation of Toluene in a Biofilter under Low Concentration

以自制包埋有恶臭假单胞杆菌的缓释复合滤料(CPW)为填料,采用生物过滤法净化甲苯废气.分析了进气载荷和停留时间对降解能力的影响,验证了滤塔停歇期和重新启动后对微生物的变化和系统净化效率的影响.结果表明,包埋功能菌剂的复合填料,无需挂膜,微生物数量多、活性强,对甲苯有较强的降解能力,在适宜的气体停留时间74.2 s,去除率为97.3%,进气载荷为22.11 g/(m^3·h)时,最大去除负荷为16.97 g/(m^3·h).装置在停歇3、7、30 d后,系统净化能力恢复稳定至80%,所需的时间分别为5、21和45 h.停歇周期对生物滤塔恢复及填料微生物影响较大,停歇30 d恢复运行后的细菌数量要明显高于恢复前,且下层细菌数量最多.

Self-made biological fillers embedded with Pseudomonas putida were used as biofiher packing mate- rials for treating toluene. The effects of inlet loading rate （ILR） and empty bed residence time （EBRT） were evaluated. Changes in micro-organisms before and after the shut down period and its effect on biofiher per- formance were investigated. Results indicated that, no need for hanging film, activities of micro-organisms were high, capacity to eliminate toluene was strong. Optimal EBRT was 74.2 s, and removal efficiency ranged from 49.3 to 97.3 % ; maximum elimination capacity, 16.97 g ·（m3 · h） -1 was occurred at ILR of 22. 11 g · （m3 · h） -1 The recovery time needed for achieving constant state, after biofiher shut down for 3 d, 7 d and 30 d, were 5, 21 and 45 h, respectively. Microbial counts after recovery were significantly higher than the 30d shut-down period, and lower layer had the highest microbial population.