Ferral-catalyzed ozonation of aqueous dyes in a bubble-column reactor

A novel bacterial species identified as Exiguobacterium sp. RD3 degraded the diazo dye reactive yellow 84A (50 mg l(-1)) within 48 h at static condition, at 30 degrees C and pH 7. Lower salinity conditions were found to be favorable for growth and decolorization. Enzymatic activities of an H(2)O(2) independent oxidase along with laccase and an azoreductase suggest their prominent role during the decolorization of reactive yellow 84A. Presence of an H(2)O(2) independent oxidase in Exiguobacterium sp. RD3 was confirmed and hydrogen peroxide produced was detected by a coupled iodometric assay. Azoreductase activity was prominent in presence of cofactors NADH and NADP in mineral salt medium. Considerable depletion of COD of the dye solution during degradation of dye was indicative of conversion of complex dye into simple oxidizable products. Products of degradation were analyzed by HPLC, FTIR and GCMS. A possible product of the degradation was identified by GCMS. Degradation of dye resulted with significant reduction of phytotoxicity, confirming the environmentally safe nature of the degradation metabolites.

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“…High rate in COD reduction is considered as an indication of mineralization (Hassan and Hawkyard 2002).…”

Section: Change In Cod During Decolorizationmentioning

confidence: 99%

Coordinate action of exiguobacterial oxidoreductive enzymes in biodegradation of reactive yellow 84A dye

et al. 2008

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“…There is also the possibility that a secondary pollution problem will arise because of excessive chemical use. Other emerging techniques such as ozonation [10], treatment using Fenton's reagent, electrochemical destruction [11] and photocatalysis [12] may have potential for decolorization. However, such technologies usually involve complicated procedures or are economically unfeasible [13].…”

Section: Introductionmentioning

confidence: 99%

Optimization of decolorization of methylene blue by lignin peroxidase enzyme produced from sewage sludge with Phanerocheate chrysosporium

Alam

Mansor

Jalal

2009

Journal of Hazardous Materials

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“…Therefore, chemical degradation of azo dyes has attracted much attention in recent years. Different oxidation technologies have been studied for the degradation of azo dyes in wastewater, such as H 2 O 2 -based oxidation [4,5], catalytic ozonation [6], photocatalysis [7,8], ultrasonic irradiation [9], and electrochemical oxidation [10]. However, as far as is known, little has been reported on the degradation of azo dyes in general by potassium ferrate.…”

Section: Introductionmentioning

confidence: 99%

Degradation of azo dye active brilliant red X-3B by composite ferrate solution

Zhang

2009

Journal of Hazardous Materials

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Ferral-catalyzed ozonation of aqueous dyes in a bubble-column reactor

Cited by 26 publications

References 17 publications

Coordinate action of exiguobacterial oxidoreductive enzymes in biodegradation of reactive yellow 84A dye

Coordinate action of exiguobacterial oxidoreductive enzymes in biodegradation of reactive yellow 84A dye

Optimization of decolorization of methylene blue by lignin peroxidase enzyme produced from sewage sludge with Phanerocheate chrysosporium

Degradation of azo dye active brilliant red X-3B by composite ferrate solution

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