Effective anaerobic decolorization of azo dye acid orange 7 in continuous upflow packed-bed reactor using biological activated carbon system

Gergo Mezohegyi, Alexey Kolodkin, Ursula I. Castro, Christophe Bengoa, Frank Stuber, Josep Font, Azael Fabregat*, Agustí Fortuny

*Corresponding author for this work

Research output: Contribution to journalArticleResearchpeer-review

81 Citations (Scopus)

Abstract

The anaerobic reduction of azo dye Acid Orange 7 (AO7) was investigated in a continuous upflow packed-bed reactor (UPBR) containing biological activated carbon (BAC). Preliminary batch experiments using graphite proved the catalytic effect of using a solid electron mediator in the reactor. Before the start of continuous experiments, AO7 adsorption studies were done to control adsorption effects on initial decolorization rates. In a continuous UPBR-BAC system, high azo dye conversion rates were achieved during very short space times (r) up to 99% in 2.0 min. In order to know which are the crucial and most influencing properties of BAC in A07 reduction, other materials-graphite and alumina-with different properties were also tested in UPBRs. The results show that both electron-mediating capability and specific surface area of activated carbon contribute to higher reduction rates. Compared to other continuous and biological processes treating azo dyes, UPBR-BAC seems to be a very effective and promising system for anaerobic azo dye degradation.

Original languageEnglish
Pages (from-to)6788-6792
Number of pages5
JournalIndustrial & Engineering Chemistry Research
Volume46
Issue number21
DOIs
Publication statusPublished - 10 Oct 2007
Externally publishedYes

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