期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 411, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2021.125103
关键词
Pollution; Pb; Soil; Bioremediation; Soil aggregation
资金
- National key research and development program [2018YFC1802904]
- National Science Foundation of China [41561094, 41867061]
- Inner Mongolia Science & Technology Plan
- Special Fund for the Transformation of Scientific and?Technological Achievements in Inner Mongolia [2019CG062]
In this study, MICP technology was used to remediate soil Pb pollution, resulting in a 76.34% decrease in leaching amount of heavy metals in soil, a significant increase in large soil particle size by 71.43%, and a 73.78% increase in soil porosity, enhancing soil permeability and hydraulic conductivity.
Soil structure is an important index to evaluate soil quality; however, previous researchers have only paid attention to the effect and economic benefits of soil heavy metal remediation. In this study, microbial-induced carbonate precipitation (MICP) technology was used to remediate soil Pb pollution, and its effect on soil structure was studied by sieving and X-ray computed tomography techniques. The results showed that the leaching amount of heavy metals in soil decreased by 76.34% after remediation. Interestingly, due to the addition of organic matter and microorganisms, the soil particle size changed from microaggregates to large aggregates, and the large soil particle size (diameter > 2 mm) increased significantly by 71.43%. The soil porosity increased by 73.78%, which enhanced the soil permeability and increased the soil hydraulic conductivity. Therefore, MICP bioremediation not only remediated soil heavy metal pollution but also promoted the soil aggregation structure, which has important significance for soil remediation and improvement.
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