Decolorization enhancement by optimizing azo dye loading rate in an anaerobic reactor

Cui, Min-Hua; Cui, Dan; Liang, Bin; Sangeetha, T.; Wang, Aijie; Cheng, Hao-Yi

doi:10.1039/c6ra04665g

Cited by 23 publications

(12 citation statements)

References 43 publications

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“…Azo dyes are primary contaminants in dyeing process effluent (DE) [ 1 , 2 ]. Owing to their harmful health effects and environmental consequence, how to effectively remove azo dyes becomes a research focus in the field of water pollution control.…”

Section: Introductionmentioning

confidence: 99%

Effects of azo dye on simultaneous biological removal of azo dye and nutrients in wastewater

et al. 2018

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The potential disrupting effects of Azo dye on wastewater nutrients removal deserved more analysis. In this study, 15 days exposure experiments were conducted with alizarin yellow R (AYR) as a model dye to determine whether the dye caused adverse effects on biological removal of both the dye and nutrients in acclimated anaerobic–aerobic–anoxic sequencing batch reactors. The results showed that the AYR removal efficiency was, respectively, 85.7% and 66.8% at AYR concentrations of 50 and 200 mg l−1, while higher AYR inlet (400 mg l−1) might inactivate sludge. Lower removal of AYR at 200 mg l−1 of AYR was due to the insufficient support of electron donors in the anaerobic process. However, the decolorized by-products p-phenylenediamine and 5-aminosalicylic were completely decomposed in the following aerobic stage at both 50 and 200 mg l−1 of AYR concentrations. Compared with the absence of AYR, the presence of 200 mg l−1 of AYR decreased the total nitrogen removal efficiency from 82.4 to 41.1%, and chemical oxygen demand (COD) removal efficiency initially decreased to 68.1% and then returned to around 83.4% in the long-term exposure time. It was also found that the inhibition of AYR, nitrogen and COD removal induced by a higher concentration of AYR was due to the increased intracellular reactive oxygen species production, which caused the rise of oxidation–reduction potential value and decreased ammonia monooxygenase and nitrite oxidoreductase activities.

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Section: Introductionmentioning

confidence: 99%

Effects of azo dye on simultaneous biological removal of azo dye and nutrients in wastewater

et al. 2018

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“…The mixed wastewater is usually characterized as fickle composition, biorefractory, and insufficient available electron donor source (COD<1000 mg/L). To remedy these mixed refractory wastewaters to meet the stringent discharge standard about COD and chroma, anaerobic methods are extensively employed for recalcitrant compounds biotransformation (Cui et al, 2016c). However, anaerobic bioprocesses require plentiful electron donors (far exceeds stoichiometric requirements) for microbial metabolism and reduction of oxidized groups (Mu et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of anaerobic sludge volume for improving azo dye decolorization in a hybrid anaerobic reactor with built-in bioelectrochemical system

Cui

Gao

et al. 2017

Chemosphere

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A hybrid anaerobic reactor with built-in bioelectrochemical system (BES) has been verified for efficiently treating mixed azo dye wastewater, yet still facing many challenges, such as uncertain reactor construction and insufficient electron donors. In this study, an up-flow hybrid anaerobic reactor with built-in BES was developed for acid orange 7 (AO7) containing wastewater treatment. Cathode and real domestic wastewater both served as electron donor for driving azo dye decolorization. The decolorization efficiency (DE) of AO7 (200 mg/L) in the hybrid reactor was 80.34 ± 2.11% with volume ratio between anaerobic sludge and cathode (VR) of 0.5:1 and hydraulic retention time (HRT) of 6 h, which was 15.79% higher than that in BES without sludge zone. DE was improved to 86.02 ± 1.49% with VR increased to 1:1. Further increase in the VR to 1.5:1 and 2:1, chemical oxygen demand (COD) removal efficiency was continuously improved to 28.78 ± 1.96 and 32.19 ± 0.62%, but there was no obvious DE elevation (slightly increased to 87.62 ± 2.50 and 90.13 ± 3.10%). BES presented efficient electron utilization, the electron usage ratios (EURs) in which fluctuated between 11.02 and 13.06 mol e/mol AO7. It was less than half of that in sludge zone of 24.73-32.06 mol e/mol AO7. The present work optimized the volume ratio between anaerobic sludge and cathode that would be meaningful for the practical application of this hybrid system.

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“…By now, biological treatment is still the most widely applied wastewater remediation method. But the pure biological facilities can no longer satisfy the increasing wastewater amount and the stricter wastewater discharging standard [3][4][5]. It is urgent to explore a feasible, sustainable and economical strategy to deal with the wastewater issue.…”

Section: Introductionmentioning

confidence: 99%

Analysis of electrode microbial communities in an up-flow bioelectrochemical system treating azo dye wastewater

Cui

Gao

et al. 2016

Electrochimica Acta

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Decolorization enhancement by optimizing azo dye loading rate in an anaerobic reactor

Abstract: An up-flow anaerobic sludge blanket (UASB) reactor was developed to investigate the effect of azo dye loading rate on the decolorization performance and microbial community. and 20.38% were the most enriched genera, which were also functional for azo dye reduction.

Cited by 23 publications

References 43 publications

Effects of azo dye on simultaneous biological removal of azo dye and nutrients in wastewater

Effects of azo dye on simultaneous biological removal of azo dye and nutrients in wastewater

Evaluation of anaerobic sludge volume for improving azo dye decolorization in a hybrid anaerobic reactor with built-in bioelectrochemical system

Analysis of electrode microbial communities in an up-flow bioelectrochemical system treating azo dye wastewater

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