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The mineralization of 5-amino-2,4,6-triiodoisophthalic acid by a two-stage fixed-bed reactor.

Authors :
Lecouturier D
Rochex A
Lebeault JM
Source :
Water research [Water Res] 2008 May; Vol. 42 (10-11), pp. 2491-8. Date of Electronic Publication: 2008 Feb 19.
Publication Year :
2008

Abstract

Iodinated X-ray contrast media have been detected in hospital effluent, sewage treatment plant effluent, rivers and groundwater aquifers. No process has been developed to remove triiodinated aromatic molecules. In this paper, we present a biological sequential process using an anaerobic fixed-bed reactor coupled in series with an aerobic fixed-bed reactor for degrading 5-amino-2,4,6-triiodoisophthalic acid (ATIA), the core structure of a X-ray contrast media family. The results obtained showed that the coupled reactor eliminated up to 870+/-44 mg of carbon L(-1) day(-1), with a molar ethanol/ATIA ratio of 4 in the feeding medium. The anaerobic reactor (ANR) undertook the majority of the deiodination of the aromatic nucleus and had a maximum deiodination rate of 23.4+/-0.06 mM day(-1). The aerobic reactor (AER) mineralized ATIA and was also able to eliminate its metabolites. This study suggests that the mineralization of ATIA can be achieved efficiently in a coupled anaerobic-aerobic bioreactor.

Details

Language :
English
ISSN :
0043-1354
Volume :
42
Issue :
10-11
Database :
MEDLINE
Journal :
Water research
Publication Type :
Academic Journal
Accession number :
18342906
Full Text :
https://doi.org/10.1016/j.watres.2008.02.006