Biomass reduction and arsenic transformation during composting of arsenic-rich hyperaccumulator Pteris vittata L.

被引:47
作者
Cao, Xinde [1 ,3 ]
Ma, Lena [3 ]
Shiralipour, Aziz [2 ]
Harris, Willie [3 ]
机构
[1] Shanghai Jiao Tong Univ, Sch Environm Sci & Engn, Shanghai 200240, Peoples R China
[2] Univ Florida, Ctr Nat Resources, Gainesville, FL 32611 USA
[3] Univ Florida, Dept Soil & Water Sci, Gainesville, FL 32611 USA
基金
中国国家自然科学基金;
关键词
Arsenic-rich biomass; Arsenic speciation; Composting; Phytoextraction; Pteris vittata L; Waste disposal; CONTAMINATED SOILS; SPECIATION; PHOSPHATE; FERN; PHYTOREMEDIATION; ACCUMULATION; NUTRIENTS; FRONDS; SITE;
D O I
10.1007/s11356-009-0204-7
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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.). High-As fern biomass containing similar to 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. Composting reduced the fern biomass by 38%, comparable to 35% reduction of the low-As fern biomass containing similar to 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 [Mg(3)(AsO(4))(2)a <...8H(2)O] which was evidenced by XRD and SEM-EDS analysis. 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.
引用
收藏
页码:586 / 594
页数:9
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