Evaluation of the Performance of Structured Mixed Packing and Inert Packing Materials in Toluene Biotrickle-filtration
2011
Sun, Duanfang, South China University of Technology, Guangzhou, China | Li, Jianjun, South China University of Technology, Guangzhou, China | An, Taicheng, Chinese Academy of Sciences, Guangzhou, China | Xu, Meiying, Guangdong Institute of Microbiology, Guangzhou, China | Sun, Guoping, South China University of Technology, Guangzhou, China | Guo, Jun, South China University of Technology, Guangzhou, China
Packing materials play a key role in waste gas treatment. Organic and inert packing materials have their disadvantages, which may be minimized by mixed packing. In this study, various operating conditions were applied to evaluate the performance of structured mixed packing and inert packing materials in toluene biotrickle-filtration. Four biotrickle filters were packed with structured mixed packing materials, namely, ceramic pall rings, ceramic rashig rings, and lava rock. Their toluene removal capacity was studied for 217 day using a laboratory-scale reaction under various operating conditions. The key elimination capacity (removal efficiency greater than 95%) ranking of the biotrickle filters was as follows: Structured mixed packing (306.20 ± 7.90 g/㎥/h) greater than pall ring (156.71 ± 7.84 g/㎥/h) greater than rashig ring (153.31 ± 6.14 g/㎥/h) greater than lava rock (150.32 ± 9.19 g/㎥/h). The structured mixed packing and inert packing resulted in excellent toluene-degrading biofilter performance under long-term operation. The structured mixed packing provided a more rapid startup rate and better process robustness than the inert packing did. The biotrickle filter with mixed packing materials had a high elimination capacity which makes it suitable for various real-life applications, whereas the capability of the inert packing material was more suitable for treating a steady low toluene load.
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