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Int. J. Environ. Res. Public Health 2018, 15(1), 35; https://doi.org/10.3390/ijerph15010035

Aerobic Biodegradation Characteristic of Different Water-Soluble Azo Dyes

State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210046, China
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Received: 10 November 2017 / Revised: 17 December 2017 / Accepted: 20 December 2017 / Published: 26 December 2017
(This article belongs to the Special Issue Remediation and Analysis of Soil, Air, and Water Pollution)
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Abstract

This study investigated the biodegradation performance and characteristics of Sudan I and Acid Orange 7 (AO7) to improve the biological dye removal efficiency in wastewater and optimize the treatment process. The dyes with different water-solubility and similar molecular structure were biologically treated under aerobic condition in parallel continuous-flow mixed stirred reactors. The biophase analysis using microscopic examination suggested that the removal process of the two azo dyes is different. Removal of Sudan I was through biosorption, since it easily assembled and adsorbed on the surface of zoogloea due to its insolubility, while AO7 was biodegraded incompletely and bioconverted, the AO7 molecule was decomposed to benzene series and inorganic ions, since it could reach the interior area of zoogloea due to the low oxidation-reduction potential conditions and corresponding anaerobic microorganisms. The transformation of NH3-N, SO42− together with the presence of tryptophan-like components confirm that AO7 can be decomposed to non-toxic products in an aerobic bioreactor. This study provides a theoretical basis for the use of biosorption or biodegradation mechanisms for the treatment of different azo dyes in wastewater. View Full-Text
Keywords: azo dye; aerobic biodegradation; Acid Orange 7; Sudan I; solubility azo dye; aerobic biodegradation; Acid Orange 7; Sudan I; solubility
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Sheng, S.; Liu, B.; Hou, X.; Wu, B.; Yao, F.; Ding, X.; Huang, L. Aerobic Biodegradation Characteristic of Different Water-Soluble Azo Dyes. Int. J. Environ. Res. Public Health 2018, 15, 35.

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