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Tytuł:
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Simulating the synergy of electron donors and different redox mediators on the anaerobic decolorization of azo dyes: Can AQDS-chitosan globules replace the traditional redox mediators?
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Autorzy:
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Zhou W; College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Chen X; State Environmental Protection Engineering Center for Pollution Treatment and Control in Textile Industry, Donghua University, Shanghai, 201620, China; School of Mechanical Engineering, Sichuan University of Science & Engineering, Sichuan Provincial Key Lab of Process Equipment and Control, Zigong, 643000, China. Electronic address: .
Ismail M; College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Wei L; College of Environmental Science and Engineering, Donghua University, Shanghai, 201620, China.
Hu B; Key Laboratory of Water Pollution Control and Environmental Safety of Zhejiang Province, Hangzhou, 310058, China. Electronic address: .
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Źródło:
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Chemosphere [Chemosphere] 2021 Jul; Vol. 275, pp. 130025. Date of Electronic Publication: 2021 Feb 20.
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Typ publikacji:
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Journal Article
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Język:
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English
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Imprint Name(s):
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Publication: Oxford : Elsevier Science Ltd
Original Publication: Oxford, New York, : Pergamon Press.
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MeSH Terms:
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Azo Compounds*
Chitosan*
Anaerobiosis ; Color ; Coloring Agents ; Electrons ; Oxidation-Reduction
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Contributed Indexing:
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Keywords: AQDS; Azo dye wastewater; Chitosan; Electron donor; Immobilized redox mediator
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Substance Nomenclature:
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0 (Azo Compounds)
0 (Coloring Agents)
9012-76-4 (Chitosan)
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Entry Date(s):
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Date Created: 20210307 Date Completed: 20210513 Latest Revision: 20210513
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Update Code:
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20240104
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DOI:
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10.1016/j.chemosphere.2021.130025
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PMID:
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33677275
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During anaerobic treatment of azo dye wastewater, the decolorization efficiency is low and dissolved redox mediators (RMs) added to the system are easy lost. In order to solve these issues, immobilized RMs have been a hot area of research. In this study a novel immobilized RM material, disodium anthraquinone-2,6-disulfonate (AQDS)-chitosan globules, which is natural, highly efficient and environmentally friendly, was prepared. Compared with natural immobilized RMs (activated carbon) and dissolved RMs (AQDS), it can be considered that it has a significant strengthening effect on the anaerobic biological degradation and decolorization of azo dye wastewater. An electron donor (ED, glucose) or RM (AQDS solution) was dosed into an anaerobic reactor to determine the enhancing effect and appropriate concentration for the decolorization treatment. The results indicate that a certain concentration of ED or RM [300 mg/L (1.667 mmol/L) glucose or 200 μmol/L AQDS solution] can improve effectively the anaerobic biological degradation and decolorization effect of azo dye wastewater. While by adding both 300 mg/L (1.667 mmol/L) glucose and 300 μmol/L AQDS (the concentrations were the initial reactive concentrations) together the decolorization efficiency was improved further. At the same time, the synergy of ED (glucose) and RM (AQDS solution) on the anaerobic decolorization of azo dye was simulated by the central combination design. A mathematical model for the decolorization efficiency has been established. According to this model, the hydraulic retention time of the best decolorization speed and efficiency has been obtained.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
