期刊
ENVIRONMENTAL TECHNOLOGY & INNOVATION
卷 19, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.eti.2020.100810
关键词
Azo dye wastewater treatment; Decolorization; Biodegradation; Self-flocculation; Extracellular polymeric substances (EPS)
资金
- National Natural Science Foundation of China [U1906221]
- National Key R&D Program of China [2018YFC0310704]
- Major Program of Shandong Province Natural Science Foundation, China [ZR2018ZB0211]
- Major Program of Shandong Province Technological Innovation Project, China [2018CXGC0307]
- Natural Science Foundation of Shandong Province, China [ZR2017MEE024]
Microorganisms with capacity to degrade and separate azo dyes from water are potential in developing eco-friendly and cost-effective method for azo wastewater treatment, challenged for large volume, toxicity and high salinity. Marine bacterium Aliiglaciecola lipolytica (A. lipolytica) was examined to decolorize Congo Red (CR), a typical azo dye in sythesized water. The results showed that the bacterium could achieve aerobic decolorization (more than 90%) and self-flocculation under wide conditions (temperature 25-35. C, initial CR concentration 25-100 mg L-1, salinity 0-20 g L-1, pH 5-6, glucose concentration 4-8 g L-1, and (NH4)(2)SO4 concentration 1-2 g L-1). It was proved that the dyes were firstly adsorbed onto cells by extracellular polymeric substances (EPS), and about 46% of them were then degraded. This degradation process was through co-metabolism with the glucose and also mediated by azoreductase and intracellular laccase. The azo linkage (-N=N-), the chromophore groups (C-N) and sulfonate groups (-SO3) were cleaved; then the naphthalene rings were decomposed, which made CR into smaller molecules. The bacterium secreted many EPS, especially protein-like and humic acid substances in tightly bound EPS (TB-EPS), which could decrease electrostatic force and increase hydrophobicity of cell surface contributed to dye adsorption and cell selfflocculation. It was stressed that self-flocculation marine bacterium A. lipolytica could provide a promising technique for azo dye wastewater treatment. (C) 2020 Elsevier B.V. All rights reserved.
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