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Open AccessArticle

Removal of Pb(II) by Pellicle-Like Biofilm-Producing Methylobacterium hispanicum EM2 Strain from Aqueous Media

1
School of Environmental Engineering, University of Seoul, Seoul 02504, Korea
2
World Institute of Kimchi, Gwangju 61755, Korea
*
Authors to whom correspondence should be addressed.
Water 2019, 11(10), 2081; https://doi.org/10.3390/w11102081
Received: 26 August 2019 / Revised: 30 September 2019 / Accepted: 3 October 2019 / Published: 5 October 2019
(This article belongs to the Special Issue Technologies Developing in Heavy Metals' Removal from Water)
As concerns are increasing about drinking water contamination with heavy metals, we investigated the possible use of a pellicle (floating biofilm)-like biofilm-producing microorganism as a biosorbent for the treatment of Pb(II) in aqueous solutions. The bacterial pellicle-producing Methylobacterium hispanicum EM2 strain (EM2) was newly isolated from mine tailing soil, and we investigated its use as a biosorbent for treating a Pb(II)-contaminated aqueous solution. The EM2 strain was strongly resistant to Pb(II) up to a concentration of 800 mg/L, and achieved remarkable adsorption performance (adsorption rate and maximum adsorption capacity of 96% ± 3.2% and 79.84 mg/g, respectively) under optimal conditions (pH, biomass content, contact time, and initial Pb(II) concentration of 7.1 g/L, 60 min, and 10 mg/L, respectively). The adsorption of Pb(II) was characterized by scanning electron microscopy-energy dispersive x-ray spectroscopy and Fourier-transform infrared analysis. The equilibrium data matched the Freundlich isotherm model well, indicating the occurrence of multilayer adsorption of Pb(II) onto the heterogeneous surface of the EM2 strain, which was also consistent with the pseudo-second-order kinetic model (R2 = 0.98). The high Pb(II) removal efficiency was also confirmed by conducting an adsorption experiment using Pb(II)-contaminated industrial wastewater. View Full-Text
Keywords: bacterial pellicle; biosorption; lead; Methylobacterium hispanicum strain EM2; bioremediation bacterial pellicle; biosorption; lead; Methylobacterium hispanicum strain EM2; bioremediation
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Jeong, S.-W.; Kim, H.K.; Yang, J.E.; Choi, Y.J. Removal of Pb(II) by Pellicle-Like Biofilm-Producing Methylobacterium hispanicum EM2 Strain from Aqueous Media. Water 2019, 11, 2081.

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