[Evaluation of gaseous biotrickling filter transient performance for TEX removal]

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.