Component analysis and heavy metal adsorption ability of extracellular polymeric substances (EPS) from sulfate reducing bacteria

•SRB EPS included carboxyl, thiol/phosphate, amino/hydroxyl functional groups.•Heavy metals had no effect on the type of functional groups of the EPS samples.•Heavy metals increased the concentrations of the surface functional groups.•EPS extracted from the Zn2+-dosed system had a higher binding aff...

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Bibliographic Details
Published in:Bioresource technology 2015-10, Vol.194, p.399-402
Main Authors: Yue, Zheng-Bo, Li, Qing, Li, Chuan-chuan, Chen, Tian-hu, Wang, Jin
Format: Article
Language:English
Subjects:
acid mine drainage
Acids
Adsorption
binding capacity
cadmium
Cadmium - chemistry
Carbon - chemistry
copper
Copper - chemistry
Desulfovibrio desulfuricans
Desulfovibrio desulfuricans - metabolism
Extracellular polymeric substances
Fourier transform infrared spectroscopy
Heavy metal
heavy metals
Hydrogen-Ion Concentration
Metals, Heavy - chemistry
Phosphates - chemistry
Polymers - chemistry
Potentiometry
Spectroscopy, Fourier Transform Infrared
Sulfate-reducing bacteria
Sulfates - chemistry
Surface Properties
titration
Water Pollutants, Chemical - chemistry
Water Purification
zinc
Zinc - chemistry
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Summary:•SRB EPS included carboxyl, thiol/phosphate, amino/hydroxyl functional groups.•Heavy metals had no effect on the type of functional groups of the EPS samples.•Heavy metals increased the concentrations of the surface functional groups.•EPS extracted from the Zn2+-dosed system had a higher binding affinity.•Zn2+ could decrease the toxic effects of Cu2+ and Cd2+ on the SRB. Extracellular polymeric substances (EPS) play an important role in the treatment of acid mine drainage (AMD) by sulfate-reducing bacteria (SRB). In this paper, Desulfovibrio desulfuricans was used as the test strain to explore the effect of heavy metals on the components and adsorption ability of EPS. Fourier-transform infrared (FTIR) spectroscopy analysis results showed that heavy metals did not influence the type of functional groups of EPS. Potentiometric titration results indicated that the acidic constants (pKa) of the EPS fell into three ranges of 3.5–4.0, 5.9–6.7, and 8.9–9.8. The adsorption site concentrations of the surface functional groups also increased. Adsorption results suggested that EPS had a specific binding affinity for the dosed heavy metal, and that EPS extracted from the Zn2+-dosed system had a higher binding affinity for all heavy metals. Additionally, Zn2+ decreased the inhibitory effects of Cd2+ and Cu2+ on the SRB.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2015.07.042