Evaluation of the performance of structured mixed packing and inert packing materials in toluene biotrickle-filtration |
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Authors: | Duanfang Sun Jianjun Li Taicheng An Meiying Xu Guoping Sun and Jun Guo |
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Institution: | (1) Chemical Engineering Laboratory, Faculty of Sciences, University of La Coruña, Campus da Zapateira, 15071 La Coruña, Spain; |
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Abstract: | 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 biotricklefiltration. 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 > 95%) ranking of the biotrickle filters was as follows: Structured mixed packing (306.20 ± 7.90
g/m3/h) > pall ring (156.71 ± 7.84 g/m3/h) > rashig ring (153.31 ± 6.14 g/m3/h) > lava rock (150.32 ± 9.19 g/m3/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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