Biological sulphate reduction and redox mediator effects on azo dye decolourisation in anaerobic–aerobic sequencing batch reactors

2005 ◽  
Vol 36 (5-6) ◽  
pp. 790-799 ◽  
Author(s):  
M.G.E. Albuquerque ◽  
A.T. Lopes ◽  
M.L. Serralheiro ◽  
J.M. Novais ◽  
H.M. Pinheiro
Keyword(s):  
Azo Dye ◽  
Redox Mediator ◽  
Sulphate Reduction ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Dye Decolourisation

The role of sulphate reduction on the reductive decolorization of the azo dye reactive orange 14

2006 ◽  
Vol 54 (2) ◽  
pp. 171-177 ◽  
Author(s):  
F.J. Cervantes ◽  
J.E. Enriquez ◽  
M.R. Mendoza-Hernandez ◽  
E. Razo-Flores ◽  
J.A. Field
Keyword(s):  
Electron Donor ◽  
Azo Dye ◽  
Redox Mediator ◽  
Sulphate Reduction ◽  
Anaerobic Sludge ◽  
Biological Mechanisms ◽  
Azo Reduction ◽  
Reactive Orange ◽  
The Impact

The aim of this study was to investigate the impact of a broad range of sulphate concentrations (0–10 g SO4−2 L−1) on the reduction of an azo dye (reactive orange 14 (RO14)) by an anaerobic sludge. An increase in the sulphate concentration generally stimulated the reduction of RO14 by sludge incubations supplemented with glucose, acetate or propionate as electron donor. Sulphate and azo dye reductions took place simultaneously in all incubations. However, there was a decrease on the rate of decolorization when sulphate was supplied at 10 g SO4−2 L−1. Abiotic incubations at different sulphide concentrations (0–2.5 g sulphide L−1) promoted very poor reduction of RO14. However, addition of riboflavin (20 μM), as a redox mediator, accelerated the reduction of RO14 up to 44-fold compared to a control lacking the catalyst. Our results indicate that sulphate-reduction may significantly contribute to the reduction of azo dyes both by biological mechanisms and by abiotic reductions implicating sulphide as an electron donor. The contribution of abiotic decolorization by sulphide, however, was only significant when a proper redox mediator was included. Our results also revealed that sulphate-reduction can out-compete with azo reduction at high sulphate concentrations leading to a poor decolorising performance when no sufficient reducing capacity is available.

Coupling intermittent micro-aeration to anaerobic digestion improves tetra-azo dye Direct Black 22 treatment in sequencing batch reactors

2019 ◽  
Vol 146 ◽  
pp. 369-378 ◽  
Author(s):  
Osmar Menezes ◽  
Rhayssa Brito ◽  
Fernando Hallwass ◽  
Lourdinha Florêncio ◽  
Mario T. Kato ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Azo Dye ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Direct Black 22

Microbial community shifts in sequencing batch reactors for azo dye treatment

2010 ◽  
Vol 82 (1) ◽  
pp. 299-306 ◽  
Author(s):  
Liang Tan ◽  
Yuanyuan Qu ◽  
Jiti Zhou ◽  
Fang Ma ◽  
Ang Li
Keyword(s):  
Microbial Community ◽  
Azo Dye ◽  
Denaturing Gradient Gel Electrophoresis ◽  
Similarity Index ◽  
Batch Reactors ◽  
Dye Wastewater ◽  
Sequencing Batch Reactors ◽  
High Concentration ◽  
Gradient Gel Electrophoresis ◽  
Microbial Diversities

Microbial community structures in sequencing batch reactors (SBRs) for azo dye wastewater treatment were analyzed by polymerase chain reaction-denaturing gradient gel electrophoresis (PCR-DGGE). Effects of dye concentration and salinity were investigated for the decolorization of both reactive brilliant red K-2G and KE-3B. The results showed that the microbial community exhibited high color removal efficiency with high concentration of K-2G (1100 mg/l) and moderate KE-3B (400 mg/l), respectively. Under high-salt conditions, decolorization of KE-3B was partially inhibited, while little effect was observed on decolorization of K-2G. The results of similarity analysis demonstrated that the DGGE banding patterns of microbial communities in K-2G and KE-3B decolorization systems were clustered into two independent groups. And it was suggested that the microbial diversities shifted proportionally with the decolorization rates for both dyes. The similarity index (Cs) of the bacterial communities under higher-salt conditions was more than those cultured with lower salinity. It was also found that microbial diversities turned out to be more abundant for both dyes with the increase of NaCl concentration. These results suggested that not only the stability but also the adequate dynamics and diversity of the microbial community structure are important for the stable performance of the SBRs treating hyper-salinity azo dye wastewater.

COMPARISON OF DIFFERENT DURATION OF ANAEROBIC AND AEROBIC PHASES ON ACID RED 18 REMOVAL IN SEQUENCING BATCH REACTORS

2016 ◽  
Vol 15 (11) ◽  
pp. 2529-2535
Author(s):  
Mohammad Reza Alavi Moghaddam ◽  
Mohammad Hakimelahi ◽  
Seyed Hossein Hashemi
Keyword(s):  
Batch Reactors ◽  
Sequencing Batch Reactors
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