Journal
BIORESOURCE TECHNOLOGY
Volume 92, Issue 2, Pages 143-149Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2003.09.001
Keywords
aerobic treatment; acid red 151; azo dyes; biodegradation; biofilter; color removal; SBR process
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The azo dye acid red 151 (AR151) was aerobically biodegraded in a sequencing batch biofilter packed with a porous volcanic rock. AR151 was used as the sole source of carbon and energy for acclimated microorganisms. Acclimation was followed using the degradation time and the oxygen uptake rate. A maximal oxygen uptake rate of 0.5 mg O-2/(1 min) was obtained. Mineralization studies showed that 73% (as carbon) of the initial azo dye was transformed to CO2 by the consortia. A maximal substrate degradation rate of 247 mg AR151/(l(reactor)d) was obtained. Color removal was up to 99% using an initial concentration of 50 mg AR151/1. Anaerobic tests suggested that in the interior of the porous material, anaerobic biotransformations can occur, contributing from 14% to 16% of the decoloration of the azo dye. (C) 2003 Elsevier Ltd. All rights reserved.
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