Enhanced decolourisation of acid orange 7 in a continuous UASB reactor with quinones as redox mediators

F. J. Cervantes, F. P. Van Der Zee, G. Lettinga, J. A. Field

Research output: Contribution to journalArticle

68 Scopus citations

Abstract

The reductive biotransformation of acid orange 7 (AO7) was explored in a lab-scale upflow anaerobic sludge blanket (UASB) reactor at low hydraulic residence times (HRT). A colour removal of 85% was achieved when the reactor was operated at a HRT of 6 hours, but decreased up to 70% when the HRT was lowered to 2 hours. Addition of the quinone model compound, anthraquinone 2,6-disulfonate (AQDS), as redox mediator, allowed for a considerably higher decolourising efficiency (>90% at all the HRT evaluated). The results indicate that the use of catalytic concentrations of AQDS (AQDS/AO7 molar ratio about 0.01) can accelerate decolourising processes achieving satisfying extent of decolourisation.

Original languageEnglish (US)
Pages (from-to)123-128
Number of pages6
JournalWater Science and Technology
Volume44
Issue number4
DOIs
StatePublished - 2001
Externally publishedYes

Keywords

  • AQDS
  • Acid orange 7
  • Quinones
  • Redox mediators

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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