Kinetic Studies of Reactive Azo Dye Decolorization in Anaerobic/aerobic Sequencing Batch Reactors

Different types of microorganisms are capable of degrading azo dyes due to their high metabolic potentials. However, many of them cannot be used as degrading agents due to the harsh conditions of dyepolluted environments. Here, halophilic and halotolerant microorganisms can be the best candidates for a practical biodecolorization process as they are able to grow easily at high concentrations of salts. In addition, some of them can tolerate the presence of other stress factors such as toxic oxyanions and heavy metals which are so common in industrial wastewaters. In recent years, several studies have been focused on halophilic and halotolerant microorganisms and their abilities for decolorization of azo dyes. For example, Shewanella putrefaciens was determined to be capable of the complete removal of Reactive Black-5, Direct Red-81, Acid Red-88 and Disperse Orange-3 (all 100 mg l −1 ) within 8 h in the presence of 40 g l −1 NaCl. Another halophilic example is Halomonas sp. GTW which has shown a remarkable performance in the removal of different azo dyes within 24 h in the presence of 150 g l −1 NaCl. Although these approaches need to be studied in more detail, some studies have designed different types of fermentation processes and even specific fermentors to provide a practical methodology for industrial wastewater remediation.Sequential anaerobic EGSB (expanded granular sludge blanket) and aerobic reactor was the result of an important attempt to design an effective approach to large-scale biodecolorization.

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“…3a, or in a continuous system in separate vessels (Fig. 3b) (Wang et al 2009;Glässer et al 1992;Tan 2001;Lourenço et al 2006).…”

Section: Anaerobic/aerobic Treatment Of Azo Dyesmentioning

confidence: 99%

Azo dye decolorization by halophilic and halotolerant microorganisms

et al. 2010

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“…This may have occurred because of evaporation in the cathode layer. The Previous studies have suggested that azo dyes cannot be decolorized at the cathode because of the high oxidation-reduction potential of the cathode (Li et al, 2010;Lourenço et al, 2006). However, in this study, there was a thin anoxic layer in the bottom of the cathode that provided conditions favorable to decolorization.…”

Section: Figure 5 Is Herementioning

confidence: 63%

Electrode and azo dye decolorization performance in microbial-fuel-cell-coupled constructed wetlands with different electrode size during long-term wastewater treatment

Fang

Chen

et al. 2017

Bioresource Technology

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Microbial-fuel-cell-coupled constructed wetlands (CW-MFCs) with various cathode layers were used for long-term azo dye wastewater treatment. Their performance was assessed using cathode diameters ranging from 20 to 27.5cm and the influence of plants at the cathode was also examined. Bioelectricity generation, ABRX3 decolorization, and chemical oxygen demand (COD) removal performances first increased and then decreased with increasing cathode diameter. The CW-MFCs with larger cathodes had an anoxic region at the cathode where ABRX3 was decolorized. This phenomenon has not been reported in previous research on MFCs using traditional air cathodes. Anode performance was influenced by the cathode. The CW-MFC with a cathode diameter of 25cm showed the best electrode performance, and the highest voltage and power density were 560mV and 0.88W/m, respectively. The highest ABRX3 decolorization and COD removal volumes were 271.53mg/L and 312.17mg/L, respectively.

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“…Initial dye concentrations of 800, 1600, and 3200 mg/L resulted in decreased cumulative CH 4 production by 57, 58, and 88%, respectively. The anaerobic dye reduction rates of reactive azo dyes were relatively high [43,44] when compared to methanogenesis rates. Therefore, the reduction products of HRO107 may have inhibitory effects on the methanogenic culture throughout the assays together with virgin HRO107.…”

Section: Effect Of Dye On Ws Digestion In Unacclimated and Acclimatedmentioning

confidence: 95%

Effect of Initial Azo Dye Concentration and Biomass Acclimation on Sludge Digestion and Dye Co‐treatment

Ozkan-Yucel¹,

Gokcay

2010

CLEAN Soil Air Water

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The effect of a reactive azo dye (the hydrolyzed form of Reactive Orange 107, HRO107) on the digestion of municipal waste sludge (WS) was studied. The study also focused on the effect of acclimation of the anaerobic mixed culture on dye treatment. Anaerobic batch assays were carried out in serum bottles under mesophilic conditions. Unacclimated and acclimated anaerobic mixed cultures were used for the study. Both unacclimated and acclimated anaerobic cultures completely reduced HRO107 during WS digestion. Inhibitory HRO107 concentration was found to be 800 mg/L for unacclimated mixed culture. Acclimation increased the inhibitory concentration level from 800 to 3200 mg/L. Sulfanilic acid and four other unidentified dye reduction end products were detected at the end of the assays. The results of this study indicated that anaerobic municipal WS digesters have the potential to be a cost efficient and effective pre treatment method.

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Kinetic Studies of Reactive Azo Dye Decolorization in Anaerobic/aerobic Sequencing Batch Reactors

Cited by 33 publications

References 13 publications

Azo dye decolorization by halophilic and halotolerant microorganisms

Azo dye decolorization by halophilic and halotolerant microorganisms

Electrode and azo dye decolorization performance in microbial-fuel-cell-coupled constructed wetlands with different electrode size during long-term wastewater treatment

Effect of Initial Azo Dye Concentration and Biomass Acclimation on Sludge Digestion and Dye Co‐treatment

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