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

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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.
LanguageEnglish
Pages123-128
JournalWater Science and Technology
Volume44
Issue number4
DOIs
Publication statusPublished - 2001

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residence time
sludge
Hydraulics
hydraulics
Acids
acid
biotransformation
reactor
Oxidation-Reduction

Cite this

Cervantes, F.J. ; van der Zee, F.P. ; Lettinga, G. ; Field, J.A. / Enhanced decolourisation of Acid Orange 7 in a continuous UASB reactor with quinones as redox mediators. In: Water Science and Technology. 2001 ; Vol. 44, No. 4. pp. 123-128.
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title = "Enhanced decolourisation of Acid Orange 7 in a continuous UASB reactor with quinones as redox mediators.",
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.",
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Enhanced decolourisation of Acid Orange 7 in a continuous UASB reactor with quinones as redox mediators. / Cervantes, F.J.; van der Zee, F.P.; Lettinga, G.; Field, J.A.

In: Water Science and Technology, Vol. 44, No. 4, 2001, p. 123-128.

Research output: Contribution to journalArticleAcademicpeer-review

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AU - Field, J.A.

PY - 2001

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AB - 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.

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