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Bioremediation of lead-contaminated soil by inorganic phosphate-solubilizing bacteria immobilized on biochar
被引:38
作者:

Zhu, Xiaoli
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机构:
Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China
Shaanxi Key Lab Earth Surface Syst & Environm Carr, Xian 710127, Peoples R China Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China

Li, Xue
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机构:
Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China

Shen, Baoshou
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机构:
Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China

Zhang, Ziye
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机构:
Xian Jinborui Ecol Tech Co Ltd, Xian, Peoples R China Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China

Wang, Junqiang
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h-index: 0
机构:
Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China
Xian Jinborui Ecol Tech Co Ltd, Xian, Peoples R China Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China

Shang, Xiaoqing
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h-index: 0
机构:
Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China
Xian Jinborui Ecol Tech Co Ltd, Xian, Peoples R China Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China
机构:
[1] Northwest Univ, Coll Urban & Environm Sci, Xian 710127, Peoples R China
[2] Shaanxi Key Lab Earth Surface Syst & Environm Carr, Xian 710127, Peoples R China
[3] Xian Jinborui Ecol Tech Co Ltd, Xian, Peoples R China
关键词:
Lead-contaminated soil;
Bio-remediation;
Inorganic phosphate-solubilizing bacteria;
(iPSB);
Biochar;
Immobilization mechanisms;
HEAVY-METAL;
ENZYME-ACTIVITIES;
PHYSICOCHEMICAL PROPERTIES;
AVAILABLE PHOSPHORUS;
MECHANISMS;
STRAW;
REMEDIATION;
COMBINATION;
IRRIGATION;
PYROLYSIS;
D O I:
10.1016/j.ecoenv.2022.113524
中图分类号:
X [环境科学、安全科学];
学科分类号:
08 ;
0830 ;
摘要:
In this study, a bio-composite (IBWS700) was prepared using inorganic phosphate-solubilizing bacteria (iPSB), which were immobilized on biochar produced from wheat straw (WS700). Further, the bio-remediation effects of the composite for lead (Pb) in soil were also investigated. The presence of different Pb species, physicochemical properties, enzyme activities, and immobilization mechanisms of Pb in soil were also evaluated. Compared to free iPSB and biochar, IBWS700 significantly decreased the lead bio-availability whereas increased the residual fraction, also affected available phosphorus (AP), cation exchange capacity (CEC), organic matter (OM) and activity of urease, alkaline phosphatase, sucrase and catalase. Interestingly, the changes in the enzyme activity, AP and OM performed twice increases with increasing Pb concentration, which was rarely reported. The reason might be attributed to the reconstruction of bacteria communities with high Pb load. Further, the immobilization mechanisms mainly included bio-adsorption and bio-precipitation. SEM revealed that the surface of IBWS700 covered with a large number of heterogeneous colonization of iPSB and white stack after Pb2+ adsorption. FTIR spectra showed that O-H, C-O-P, C--O, and C =C could play important roles in bio-adsorption. Moreover, XRD analysis indicated that bio-precipitates were mainly Pb5(PO4)3Cl. In general, the use of IBWS700 could effectively immobilize Pb2+ and improve soil quality.
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