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Title: The use of an oil-absorber-bioscrubber system during biodegradation of sequentially alternating loadings of 1,2-dichloroethane and fluorobenzene in a waste gas
Authors: Koutinas, Michalis 
Baptista, Inês I.R. 
Meniconi, Andrea 
Peeva, Ludmila G. 
Mantalaris, Athanasios A. 
Castro, Paula M. L. 
Livingston, Andrew G 
Major Field of Science: Natural Sciences
Field Category: Chemical Sciences
Keywords: 1,2-Dichloroethane;Absorption;Bioreactors;Environment;Fluorobenzene;Molecular biology
Issue Date: Nov-2007
Source: Chemical Engineering Science, 2007, vol. 62, no. 21, pp. 5989-6001
Volume: 62
Issue: 21
Start page: 5889
End page: 6001
Journal: Chemical Engineering Science 
Abstract: This work seeks to improve the robustness of vapour phase bioscrubbing by applying an absorber prior to a bioscrubber during the dynamic treatment of sequentially alternating loads of inhibitory pollutants. Rhizobiales sp. strain F11 and Xanthobacter autotrophicus sp. GJ10, exhibiting specific degradation capabilities for fluorobenzene (FB) and 1,2-dichloroethane (DCE), respectively, were used as a compound-strain model system. The stability of a combined oil-absorber-bioscrubber (OAB) was compared to the stability of a bioscrubber only (BO) system, during sequentially alternating periods (duration 3-6 d) of FB and DCE in the gas feed. The OAB achieved > 66 % degradation of FB, while in the BO system the FB removal efficiency dropped to 0% upon restoring FB feed after a 3 d FB starvation period. Following 6 d of FB starvation the BO failed to recover within 10 d, while the OAB required only 2 d to recover. In contrast, during the DCE treatment periods the OAB system did not show any advantage over the BO system. Further investigation showed that the F- (a main metabolic product from FB degradation) has a strong inhibitory effect on strain GJ10 even at concentrations below 50 mg L- 1. In the OAB system the inhibitory effect persisted for longer periods due to the absorber, which continued to supply FB to the system, and caused deterioration in the DCE removal efficiency. The inhibition of the microbial culture was confirmed by fluorescence in situ hybridisation (FISH), which showed that the activity of cells was reduced when only FB was fed. The results of this study have shown that in the presence of an inhibitory metabolic product the OAB system may not effectively improve the biological treatment of waste gas during sequential alternations in the feed of inhibitory pollutants.
ISSN: 0009-2509
DOI: 10.1016/j.ces.2007.06.040
Rights: © Elsevier
Type: Article
Affiliation : Imperial College London 
Università degli Studi di Bologna 
Universidade Católica Portuguesa 
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