Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30 °C) and thermophilic (55 °C) treatments for decolourisation of textile wastewaters

Santos, André Bezerra dos; Bisschops, Iemke; Cervantes, Francisco J.; Lier, J.B. van

doi:10.1016/j.chemosphere.2004.01.031

Cited by 114 publications

(60 citation statements)

References 29 publications

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“…Conversely, a significant increase in TOC reduction (w70%, data not shown) was observed in the aerobic stage. It was concluded that even if the microorganisms were able to decolourize the dyes under microaerophilic conditions, the aerobic microorganisms needed aeration not only for amine removal but also for TOC stabilization [62].…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Aeromonas Spp. In Microbial Degradation and Decolorization of Reactive Black in Microaerophilic – Aerobic Condition

Shah¹

2014

J Bioremed Biodeg

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Azo dyes are a widespread class of poorly biodegradable industrial pollutants. In anaerobic environments, azo bonds are reductively cleaved yielding carcinogenic aromatic amines, many of which are assumed to resist further metabolism by anaerobes bacteria. The latter compounds generally require aerobic conditions for their degradation. Reactive Black was found to be degraded using Aeromonas spp. to α-ketoglutaric acid with transient accumulation of 4-aminobenzenesulphonic acid (sulphanilic acid), 4-amino, 3-hydronapthalenesulphonic acid and 4-amino, 5-hydronapthalene 2,7 disulphonic acid as a degradation intermediate in anaerobic facultative batch culture. Colour and Total Organic Carbon (TOC) was successfully removed more than 95% and up to 50% respectively. There is no significant correlation between pH and oxygen depletion since there is slightly change in pH was observed (pH from 7.21 to 7.25) though the anaerobiosis was found developed throughout the experiment (redox potential from 0.7 to 1.6 mV). The anaerobic metabolism of glucose as co-metabolite also shown to provide the electrons required for the initial reductive cleavage of the azo group. This finding suggest that it is possible to mineralize the azo dye in the environment; thereby, avoiding accumulation of toxic intermediates in the water. The results provide evidence that the successive microaerophilic/aerobic stages, using Aeromonas spp. in the same bioreactor, were able to form aromatic amines by the reductive break down of the azo bond and to oxidize them into non-toxic metabolites. Journal of Bior emediation & Biodegradation

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Section: Discussionmentioning

confidence: 99%

Evaluation of Aeromonas Spp. In Microbial Degradation and Decolorization of Reactive Black in Microaerophilic – Aerobic Condition

Shah¹

2014

J Bioremed Biodeg

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“…La velocidad de reducción del RD23 (qr) en el R 1 fue de 5.14 mg L -1 h En este trabajo la adición de CAG como mediador redox en el R 1 favoreció la fase de reducción del colorante, incrementando 12 veces la velocidad de reducción. Dos Santos et al (2004), utilizaron como mediadores redox antraquinona-2,6-disulfonato, antraquinona-2-sulfonato y Riboflavina, para evaluar el efecto de éstos en la velocidad de reducción de los colorantes Rojo Reactivo 2, Naranja ácido 7 y Amarillo mordente 10 en pruebas a nivel laboratorio y observaron que con el uso de mediadores redox la velocidad de reducción se incrementó 8 veces. Sirianuntapiboon y Sansak (2007), trataron agua residual textil que contenía RD23 mediante un sistema de CAG-SBR, la concentración que evaluaron fue de 40 mg L -1 donde obtuvieron eficiencias de remoción del 94-97 % en un TRH de 180 h, 2.5 veces más que el TRH alcanzado en este trabajo.…”

Section: Cinéticas De Reacciónunclassified

Tratamiento del Colorante Azo Rojo Directo 23 mediante Reactores Discontinuos Secuenciados Anaerobios/Aerobios

Morales-Guzmán

Melgoza-Alemán

2009

Inf. tecnol.

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ResumenSe evaluó el tratamiento del colorante azo Rojo Directo 23 mediante un proceso anaerobio/aerobio integrado en un sólo reactor. Se utilizaron dos reactores: uno de lecho expandido con carbón activado granular como mediador redox y otro conteniendo la biomasa suspendida, ambos operados en discontinuo. Se evaluó la eficiencia del proceso mediante la reducción y transformación del colorante a aminas aromáticas totales en la fase anaerobia y la degradación de éstas en la fase aerobia. La eliminación del colorante fue por microorganismos y no por adsorción en el carbón activado granular. Las concentraciones de colorante utilizadas fueron de 25 a 100 mg L -1 . En el reactor de lecho expandido la eficiencia de degradación global del colorante fue del 90 % y la eliminación de las aminas formadas fue del 100 %. Palabras clave: Azo Rojo Directo 23, colorante, proceso anaerobio/aerobio, aminas aromáticas, carbón activado Treatment of Direct Red 23 Azo Dye by Anaerobic/Aerobic Sequencing Batch Reactors AbstractThe treatment of the azo dye Direct Red 23 was evaluated by an anaerobic/aerobic process done in a single reactor. Two reactors were used: one was an expanded-bed with granular activated carbon as redox mediator and the other containing the suspended biomass, both operated in batch mode. The efficiency of the process was evaluated by the reduction and transformation of the azo dye to total aromatic amines in the anaerobic phase and the degradation of these in the aerobic phase. The elimination of azo dye direct red was by microorganisms and not by adsorption in the granular activated carbon. The concentration of azo dye used was of 25 to 100 mg L -1 . In the expanded-bed reactor the removal efficiency of the dye was 90 % and the elimination of the amines formed was of 100 %.

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“…Vancomycin and 2-bromoethane sulfonic acid (BES) were used as acidogens and methanogens inhibitor, respectively (Dos Santos, 2004). Glucose and sodium acetate were used as co-substrate or electron donor.…”

Section: Materials and Methods Chemicalsmentioning

confidence: 99%

“…A large proportion of textile waste-waters, mainly from the dyebath and rinsing processes, is discharged at high temperatures (40-70 o C). However, thermophilic anaerobic textile dye decolorization by biological treatment has been only briefly examined (Dos Santos et al, 2004;Willts and Ashbolt, 2000).…”

Section: Introductionmentioning

confidence: 99%

Comparative decolorizing efficiency of textile dye by mesophilic and thermophilic anaerobic treatments

Boonyakamol

Imai

Chairattanamanokorn

et al. 2008

J. of Wat. & Envir. Tech.

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Anaerobic decolorization of two kinds of dye, viz., azo type represented by Methyl Orange (MO) and anthraquinone type represented by Reactive Blue 4 (RB4) was performed using digested sludge under mesophilic (35 O C) and thermophilic (55 O C) conditions. Decolorization of dye was investigated to compare the efficiency and extent of decolorization, and additionally to evaluate the effect of temperature and dye on decolorizing microorganisms. Glucose was used as an electron donor in terms of co-substrate without the addition of other nutrients. Under thermophilic treatment, high efficiency of decolourisation was shown in both of the dyes at high concentration, 1000 mg·L -1 of MO and 600mg·L -1 of RB4 compared with mesophilic treatment. MO, 200mg·L -1 , was decolorized 95-98% under both mesophilic and thermophilic conditions. High decolorizing efficiency of RB4, 100mg·L -1 , obtained under thermophilic conditions, was 80% when compared with mesophilic conditions (70%). The reduced form of MO showed an auto-oxidizing effect with pink to violet color when exposed to air, while RB4 showed no autooxidizing reaction. The inhibition of MO was effected on sugar conversion to fatty acids, and CH 4 productivity resulted in slow reduction of TOC. While RB4 inhibited only on methane productivity, in which TOC reduction was similarly used as control. Due to the increase of temperature, methanogenesis was inhibited and which low CH 4 production, whereas an increase of decolorizing efficiency on both dye decolorization and a high rate of TOC reduction was observed.

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Effect of different redox mediators during thermophilic azo dye reduction by anaerobic granular sludge and comparative study between mesophilic (30 °C) and thermophilic (55 °C) treatments for decolourisation of textile wastewaters

Cited by 114 publications

References 29 publications

Evaluation of Aeromonas Spp. In Microbial Degradation and Decolorization of Reactive Black in Microaerophilic – Aerobic Condition

Evaluation of Aeromonas Spp. In Microbial Degradation and Decolorization of Reactive Black in Microaerophilic – Aerobic Condition

Tratamiento del Colorante Azo Rojo Directo 23 mediante Reactores Discontinuos Secuenciados Anaerobios/Aerobios

Comparative decolorizing efficiency of textile dye by mesophilic and thermophilic anaerobic treatments

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