Biofiltration of paint solvent mixtures in two reactor types: overloading by hydrophobic components |
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Authors: | Jan Paca Martin Halecky Ondrej Misiaczek Kim Jones Evguenii Kozliak Miroslav Sobotka |
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Institution: | (1) Department of Fermentation Chemistry and Bioengineering, Institute of Chemical Technology, Technicka 5, 166 28 Prague, Czech Republic;(2) South Texas Environmental Institute, Texas A&M University-Kingsville, Kingsville, TX 78363, USA;(3) Department of Chemistry, University of North Dakota, Abbott Hall, 151 Cornell Street, Grand Forks, ND 58202, USA;(4) Institute of Microbiology CAS v.v.i, Academy of Sciences of the Czech Republic, Videnska 1083, 142 20 Prague 4, Czech Republic |
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Abstract: | Steady-state performance characteristics of a trickle bed reactor (TBR) and a biofilter (BF) in loading experiments with increasing
toluene/xylenes inlet concentrations while maintaining a constant loading rate of hydrophilic components (methyl ethyl and
methyl isobutyl ketones, acetone, and n-butyl acetate) of 4 g m−3 h−1 were evaluated and compared, along with the systems’ dynamic responses. At the same combined substrate loading of 55 g m−3 h−1 for both reactors, the TBR achieved more than 1.5 times higher overall removal efficiency (REW) than the BF. Increasing the loading rate of aromatics resulted in a gradual decrease of their REs. The degradation rates
of acetone and n-butyl acetate were also inhibited at higher loads of aromatics, thus revealing a competition in cell catabolism. A step-drop
in loading of aromatics resulted in an immediate increase of REW with variations in the TBR, while the new steady-state value in the BF took 6–7 h to achieve. The TBR consistently showed
a greater performance than BF in removing toluene and xylenes. Increasing the loading rate of aromatics resulted in a gradual
decrease of their REs. The degradation rates of acetone and n-butyl acetate were also lower at higher OLAROM, revealing a competition in the cell catabolism. The results obtained are consistent with the proposed hypothesis of greater
toxic effects under low water content, i.e., in the biofilter, caused by aromatic hydrocarbons in the presence of polar ketones
and esters, which may improve the hydrocarbon partitioning into the aqueous phase. |
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