Review on Soil Solidification and Heavy Metal Stabilization by Microbial-Induced Carbonate Precipitation (MICP) Technology

IF 2.2 4区环境科学与生态学 Q3 ENVIRONMENTAL SCIENCES

Geomicrobiology Journal Pub Date : 2023-05-07 DOI:10.1080/01490451.2023.2208113

Feng C. Xu, Dongxing Wang

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引用次数: 5

Abstract

Abstract Microbial-induced carbonate precipitation (MICP) as a novel eco-friendly bioremediation method has been applied tentatively in soil solidification and heavy metal stabilization. In order to deeply study the theoretical knowledge of MICP and its application in environmental engineering, this review summarizes the main mechanisms of MICP, including biosorption and biomineralization. It is proposed innovatively that bacterial cell wall and extracellular polymeric substances (EPS) can provide ions binding sites during the process of biomineral nucleation due to negative charges and functional groups. Engineering properties of soil are regulated, such as increase of unconfined compressive strength (UCS) and shear stress, decrease of permeability and improvement of erosion resistance. Supposing the available CaCO3 content (CCC), UCS can be estimated by two boundary lines with an intersection angle of 2.72°. The great bioremediation capacity of metal cations/anions greatly depends upon carbonate precipitation/coprecipitation. Biotransformation and bioaccumulation of metal poisonousness should be considered as essential mechanisms in bacteria. Finally, according to the authors’ knowledge, current deficiencies and future research directions for the technology were pointed out, which might be beneficial to the optimization, application and generalization of MICP technology.

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微生物诱导碳酸盐沉淀（MICP）技术固化土壤和稳定重金属研究进展

摘要微生物诱导碳酸盐沉淀（MICP）作为一种新型的生态修复方法，已初步应用于土壤固化和重金属稳定。为了深入研究MICP的理论知识及其在环境工程中的应用，本文综述了MICP的主要机理，包括生物吸附和生物矿化。创新性地提出，细菌细胞壁和细胞外聚合物（EPS）可以在生物矿物成核过程中由于负电荷和官能团而提供离子结合位点。土壤的工程性质受到调控，如无侧限抗压强度和剪切应力的增加、渗透性的降低和抗侵蚀性的提高。假设有效CaCO3含量（CCC），UCS可以通过两条相交角度为2.72°的边界线来估计。金属阳离子/阴离子的巨大生物修复能力在很大程度上取决于碳酸盐沉淀/共沉淀。金属毒性的生物转化和生物累积应被视为细菌的基本机制。最后，根据作者的知识，指出了该技术目前的不足和未来的研究方向，这可能有利于MICP技术的优化、应用和推广。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Geomicrobiology Journal 环境科学-地球科学综合

CiteScore

4.80

自引率

8.70%

发文量

审稿时长

3.3 months

期刊介绍： Geomicrobiology Journal is a unified vehicle for research and review articles in geomicrobiology and microbial biogeochemistry. One or two special issues devoted to specific geomicrobiological topics are published each year. General articles deal with microbial transformations of geologically important minerals and elements, including those that occur in marine and freshwater environments, soils, mineral deposits and rock formations, and the environmental biogeochemical impact of these transformations. In this context, the functions of Bacteria and Archaea, yeasts, filamentous fungi, micro-algae, protists, and their viruses as geochemical agents are examined. Articles may stress the nature of specific geologically important microorganisms and their activities, or the environmental and geological consequences of geomicrobiological activity. The Journal covers an array of topics such as: microbial weathering; microbial roles in the formation and degradation of specific minerals; mineralization of organic matter; petroleum microbiology; subsurface microbiology; biofilm form and function, and other interfacial phenomena of geological importance; biogeochemical cycling of elements; isotopic fractionation; paleomicrobiology. Applied topics such as bioleaching microbiology, geomicrobiological prospecting, and groundwater pollution microbiology are addressed. New methods and techniques applied in geomicrobiological studies are also considered.