期刊
BIOCHEMICAL ENGINEERING JOURNAL
卷 137, 期 -, 页码 162-171出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bej.2018.05.026
关键词
Azo-dye; High-throughput Miseq sequencing; Functional microbial communities; Decolorization; Mineralization
资金
- Shaoxing science and technology project [20171370057]
- National Natural Science Foundation of China [21206093]
- Innovation and entrepreneurship training program in Zhejiang [201712428001]
- National undergraduate training program for innovation and Entrepreneurship [201710349006]
A simplified model employing anaerobic(3)-oxic(2)-sedimentaion reactor and multiple linear regression was proposed in this study. Four typical azo dyes were treated as model contaminants. Decolorization firstly happened by the cleavage of -N=N- double bond, aromatic amines were yielded. Afterwards, deamination and desulphurization occurred, phenol and naphthol were formed. Then dearomatization reactions were detected by introducing the atoms of O-2 into the aromatic nucleus. At last complete mineralization happened, yielding CO2 and H2O. Two types of functional microbial communities for -N=N- double bond cleavage and aromatic rings broken were statistically identified with multiple linear regression and the results were presented in t-value biplots. The genera of Enterococcus, Acidaminococcus, Bacteroides, Megasphaera and Klebsiella played significantly important roles in cleavage of -N=N-, while Pseudomonas, Anaerovorax and Longilinea demonstrated significantly positive relationship with breaking the aromatic rings. We must point out that species in the genera of Anaerovorax and Longilinea are usually reported as strictly anaerobic bacteria, while, in our study, they were abundant in aerobic compartments and significantly positive with aromatic compounds. The findings will provide important information for operation process optimization and treatment efficiency improvement in printing and dyeing wastewater treatment plant. (C) 2018 Elsevier B.V. All rights reserved.
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