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Effect of packing material configuration and liquid recirculation rate on the performance of a biotrickling filter treating VOCs
Author(s) -
Caicedo Francisco,
Estrada José M,
Silva Juan P,
Muñoz Raúl,
Lebrero Raquel
Publication year - 2018
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.5573
Subject(s) - ethylbenzene , monolith , mass transfer , toluene , trickling filter , packed bed , structured packing , chemical engineering , biofilter , liquid flow , volatile organic compound , materials science , volumetric flow rate , chemistry , chromatography , waste management , process engineering , environmental engineering , environmental science , mechanics , organic chemistry , catalysis , engineering , physics , wastewater
BACKGROUND Gas–liquid mass transfer still constitutes an important constraint for hydrophobic volatile organic compound (VOC) removal in biotrickling filters (BTFs), packing material and liquid recirculation rate being two key parameters governing this mass transfer. The combined impact of both parameters on the abatement of VOCs has not been yet assessed. This work evaluated the influence of the trickling liquid velocity on process performance under two packed bed configurations (random vs. structured) in a BTF treating toluene and ethylbenzene. RESULTS Similar removal efficiencies >90% for both toluene and ethylbenzene (corresponding to elimination capacities of ∼50 and 32 g m –3 h –1 , respectively) were achieved regardless of the configuration. However, less intensive operating conditions were applied in the structured BTF compared to those implemented in the random packed‐bed BTF (optimal trickling liquid velocities of 10 and 20 m h –1 and liquid renewal rates of 400 and 800 mL d –1 , respectively). CONCLUSION The superior performance of the structured monolith packing at milder operating conditions was attributed to an improved liquid distribution and the reduction of dead volumes and preferential gas flow channels. Proper selection of the packing material would result in an important reduction in both energy and fresh water consumption. © 2018 Society of Chemical Industry