Abstract
Background, aim, and scope
Composting is being proposed as a pretreatment step before disposal of metal-rich biomass after phytoextraction process. This study determined the biomass reduction and arsenic transformation during composting As-rich biomass of hyperaccumulator Chinese brake fern (Pteris vittata L.).
Materials and methods
High-As fern biomass containing ∼4,600 mg As kg−1 was composted for 120 days in a laboratory-scale composter under aerated condition. Solid As speciation was determined using X-ray diffraction (XRD) and scanning electron microscopy equipped with X-ray energy dispersive elemental spectroscopy (SEM-EDS), while liquid As speciation was evaluated by high-performance liquid chromatography coupled with inductively coupled plasma mass spectrometry.
Results and discussion
Composting reduced the fern biomass by 38%, comparable to 35% reduction of the low-As fern biomass containing ∼12 mg As kg−1, indicating that the high As concentration in P. vittata had little detrimental effect on microorganisms involved in composting. Total As on a per composter basis and water-soluble As in composted biomass were lowered by 25% and 32%, respectively. Arsenic loss from the biomass resulted mainly from generation of compost leachate, with less from the As volatilization; whereas As immobilization was due to oxidation of As(III) to As(V), followed by precipitation of hoernesite [Mg3(AsO4)2⋅8H2O] which was evidenced by XRD and SEM-EDS analysis.
Conclusions and perspectives
Results from this study indicate that composting As-rich fern significantly reduced its biomass, As content, and water-soluble As. It seems that composting can be an effective step for treating As-rich biomass before disposal in landfill.
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Acknowledgments
This work was supported in part by the Florida Department of Environmental Protection and by National Natural Science Foundation of China (no. 20877056). We thank the Major Analytical Instrumentation Center of University of Florida for the help in SEM-EDS analysis.
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Cao, X., Ma, L., Shiralipour, A. et al. Biomass reduction and arsenic transformation during composting of arsenic-rich hyperaccumulator Pteris vittata L.. Environ Sci Pollut Res 17, 586–594 (2010). https://doi.org/10.1007/s11356-009-0204-7
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DOI: https://doi.org/10.1007/s11356-009-0204-7