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微生物诱导的碳酸盐沉有效地阻止了Pb2+通过土壤配置的迁移:实验室实验和模型模拟

He-Wei Song¹, Dong Li², Hao Qiu³

¹Key Laboratory of Pollution Ecology and Environmental Engineering, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; University of Chinese Academy of Sciences, Beijing 100049, China.

The Science of the total environment

|April 7, 2024

概括

微生物诱导的碳酸盐沉 (MICP) 通过将其转化为不太流动的形式,有效地使土壤中的 (Pb) 固定. 这种新的技术提供了一个具有成本效益的解决方案,以防止污染在土壤形状中的迁移.

科学领域:

环境科学环境科学
微生物学微生物学
地质化学地质化学

背景情况:

土壤中的 (Pb) 污染造成了严重的环境风险,原因是垃圾处理和污水灌不当.
阻止Pb迁移的传统方法成本高,运营复杂.
需要创新和高效的策略来减轻土壤中的污染.

研究的目的:

引入和评估微生物诱导碳酸盐沉 (MICP) 技术,以阻止Pb2+在土壤中的迁移.
研究由尿素适应MICP诱导的土壤中的微生物和遗传变化.
阐明MICP在固定中的机制及其对化学形式的影响.

主要方法:

用尿素对土壤进行适应,以促进生产尿素酶的微生物,并增强碳酸盐沉潜力.
批量实验以评估MICP处理土壤中的Pb2+固定效率.
在MICP条件下观察Pb²⁺运动的动态迁移实验.
应用两个位点合模型来描述Pb²⁺迁移.

主要成果:

尿素适应增加了生产尿素酶的微生物和尿素化基因表达,证实了MICP的潜力.
与未经处理的土壤相比,用MICP处理的土壤表现出明显更高的Pb2+固定效率.
MICP将可交换的Pb2+转化为碳酸结合的Pb,有效地减少了其迁移.
Pb²⁺的迁移速度受尿素度,pH和流量率的影响,MICP持续减缓迁移.

结论:

MICP是一种可行的和有效的方法来固定Pb2+在土壤中,为传统阻塞技术提供了替代方案.
该研究提供了对生物矿物化过程和上MICP的现场阻断机制的见解.
了解Pb对尿酶代谢和矿化产品的影响,为MICP在土壤修复中的实际应用奠定了基础.

关键词:

在MICP中,MICP是MICP.Pb 迁移的情况溶液的运输方式两个位点的吸附模型.生产尿酸的微生物

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