Review of ground improvement using microbial induced carbonate precipitation (MICP)

Bacteria play an important role in the calcification process of natural minerals and within organisms ( Table 1). It is Microbe-mediated mineralization is ubiquitous in nature, involving bacteria, fungi, viruses, and algae. These mineralization processes comprise calcification, silicification, and iron mineralization. The mechanisms for mineral formation include extracellular and intracellular biomineralization. The mineral precipitating capability of microbes is often harnessed for green synthesis of metal nanoparticles, which are relatively less toxic compared with those synthesized through physical or chemical methods. Microbe-mediated mineralization has important applications ranging from pollutant removal and nonreactive carriers, to other industrial and biomedical applications. Herein, the different types of microbe-mediated biomineralization that occur in nature, their mechanisms, as well as their applications are elucidated to create a backdrop for future research.

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“…However, issues such as the homogeneity and durability of MICP‐treated soils still require further investigations. [ 274 ]…”

Section: Applicationsmentioning

confidence: 99%

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

et al. 2020

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“…While on the other hand, most of the conventional chemical admixtures and grouting materials are known to be harmful to the environment [10]. Recent advances in geotechnical engineering have shown the potential use of biomediated systems to improve soil properties [19]- [22]. Bio-mediated or bio-improvement is a promising, environmentally friendly and sustainable alternative technique of improving the geotechnical properties of soil through microbial induced calcite precipitation [4].…”

Section: Replacementmentioning

confidence: 99%

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

2018

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Recently, the concept of using biological process in soil improvement otherwise called bio-mediated soil improvement technique has shown greater prospects in the mitigation of liquefiable soils. It is an environmental friendly technique that has generated great interest to geotechnical engineers. This paper presents a review on the microorganism responsible for the biological processes in soil improvement system, factors that affect biological process, identifying the mechanism of liquefaction and commonly adopted method to mitigate liquefaction. Next, the effect of microbial induced calcite precipitation (MICP) on the strength and cyclic response were also analyzed, where it was identified that higher cementation level leads to formation of larger sized calcite crystals which in turn leads to the improved shear strength, stiffness and cyclic resistance ratio of the soil. However, the effects of various bacteria, cementation reagent concentrations amongst other factors were not fully explored in most of the studies. Finally, some of the challenges that lay ahead for the emerging technology are optimizing treatment factors (bacteria and cementation reagent concentration), upscaling process, training of researchers/technologist and long – time durability of the improved soils.

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“…Microbial-induced calcium carbonate precipitation (MICP) technique is considered as an environmental and ecological friendly ground improvement and soil reinforcement method [2]. By spraying bacteria and cementation solutions onto the surface of sands, calcium carbonate (CaCO 3 ) is generated and rapidly precipitated into the pore space among sand particles.…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Wind Erosion Resistance and Strength of Sands Treated with Microbial‐Induced Calcium Carbonate Precipitation

Wang

Zhang

Ding

et al. 2018

Advances in Materials Science and Engineering

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Wind erosion phenomenon is commonly encountered in desert areas, which is harmful to engineering constructions and environment. is study proposed an innovative microbial-induced calcium carbonate precipitation (MICP) technique to reinforce sands for mitigating natural hazards caused by the wind erosion. A series of small-scale laboratory experiments were performed to evaluate wind erosion resistance of MICP-treated sands with different treatment cycles. e spraying method was used to treat sand specimens, and unconfined compression (UCC) strength tests were also conducted to assess the performance of the MICP technique. Experimental results revealed that the bulk density of treated sand was slightly increased with the number of MICP treatment cycles. Additionally, the wind erosion rate of treated sands was significantly decreased, and the UCC strength was increased (maximum to 4 MPa) with the number of treatment cycles, which was mainly attributed to the bonding effect from the microbial-induced CaCO 3 crystals among sand particles based on the scanning electron microscopy (SEM) analyses. Such effect also facilitated to form a hard protection layer on top of the sand specimen in order to improve the wind erosion resistance of MICP-treated sands. is technique provides an alternative method to mitigate and prevent the aggravation of desertification.

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Review of ground improvement using microbial induced carbonate precipitation (MICP)

Cited by 132 publications

References 48 publications

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

Microbe‐Mediated Extracellular and Intracellular Mineralization: Environmental, Industrial, and Biotechnological Applications

Review on biological process of soil improvement in the mitigation of liquefaction in sandy soil

Experimental Study on Wind Erosion Resistance and Strength of Sands Treated with Microbial‐Induced Calcium Carbonate Precipitation

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