Enhanced decolourisation of acid orange 7 in a continuous UASB reactor with quinones as redox mediators.
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.
Cervantes
F J
FJ
Sub-Department of Environmental Technology, Wageningen University, Bomenweg 2, P.O. Box 8129, 6700 EV Wageningen, The Netherlands. Francisco.Cervantes@algameen.mt.wau.nl
van der Zee
F P
FP
Lettinga
G
G
Field
J A
JA
D000880:Anthraquinones / Q000737:chemistry; D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D019149:Bioreactors; D004396:Coloring Agents / Q000737:chemistry*; D010084:Oxidation-Reduction; D014865:Waste Disposal, Fluid / Q000379:methods*; D014872:Water Movements
D000880:Anthraquinones; D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; C408124:anthraquinone-2,6-disulfonate; C014722:2-naphthol orange