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Adsorption of Heavy Metals Using γ-PGA Produced by Bacillus pumilus

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Abstract:

Poly-γ-glutamic acid (γ-PGA) produced by Bacillus pumilus C2 was employed to remove heavy metals from sewage of magnesium - based exhaust gas cleaning system (Mg-EGCS). The components of heavy metals in the sewage were detailed analyzed. On the base of the analytical results, the effects of addition amount of γ-PGA, adsorption time, temperature and NaCl concentration on the removal efficiency of typical heavy metals were further investigated. The optimal removal rates of heavy metals were obtained at the γ-PGA dosage of 9 g/L and adsorption duration of 30 min. The γ-PGA had excellent tolerance for high temperatures up to 80°C and exhibited steady heavy metal removal efficiency in NaCl concentrations of 0 – 24%. Under the optimal conditions, the removal rates of Zn, Cr, V, Cd, Pb and Ni by γ-PGA in a real sewage of Mg-EGCS achieved 53.6%, 100%, 49.2%, 72.7%, 33.7% and 39.9% respectively.

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Periodical:

Materials Science Forum (Volume 932)

Pages:

124-128

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.932.124

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Online since:

September 2018

Authors:

Wei Feng Liu, Xue Wei Li, Wen Bo Dong, Le Bo, Yi Min Zhu, Ling Hua Zhang

Keywords:

Adsorption, Bacillus pumilus, Heavy Metals, Magnesium-Based Exhaust Gas Cleaning System, Poly-γ-Glutamic Acid (γ-PGA)

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© 2018 Trans Tech Publications Ltd. All Rights Reserved

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