苯系混合气体生物滴滤器非稳态工况性能

Evaluation of Gaseous Biotrickling Filter Transient Performance for TEX Removal

用以纤维附着活性炭 (ACOF)和不锈钢丝网为载体材料的气体生物滴滤器 (BTF)进行了净化TEX(甲苯、乙苯和二甲苯 )混合气体的负荷冲击和闲置恢复运行 .负荷冲击实验表明 ,在最大消除能力范围以内 ,污染负荷加倍后 ,起始阶段净化效率下降 2 0 %左右 ,但 2d后就基本恢复原有效率 .闲置恢复实验表明 ,8～ 12h的停运闲置对设备的性能基本无影响 ;2d闲置停运后 ,恢复开机时性能下降 2 0 %左右 ,但在 4～ 6h内便能恢复 ;2 9d的闲置对设备的性能影响较大 ,恢复开机时性能下降 70 %～ 80 % ,需 10d左右的时间才能基本恢复 .结果表明 ,采用ACOF和不锈钢丝网的BTF具较好的抗负荷变化及缓冲能力 .

The gaseous stream laden with toluene, ethylbenzene and the three xylenes (TEX) compounds is used to evaluate the transient performance of a biotrickling filter (BTF) that packes with the mixture of ACOF (Activated Carbon on Fiber) and stainless steel mesh as biological carrier. The shock loading experiment show that if the loading is varied within the limits of the maximum EC, when the loading was doubled, the removal efficiency decreased 20% in the beginning, and after about 2 days, it regained the original removal efficiency. The non-use experimental results show that short time (8～12 h) non-use had no or very little effect on the BTF removal efficiency. 2 days scale non-use caused a decrease of 20% in the BTF performance, and need 4～6 h to regain the initial performance. 29 days' non-use caused a decrease of 70%～80% in the BTF performance, and needed about 10 days to get recover.