Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement

Meng, Hao; Shu, Shuang; Gao, Yufeng; Yan, Boyang; He, Jia

doi:10.1016/j.enggeo.2021.106374

Cited by 61 publications

(11 citation statements)

References 23 publications

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“…Amongst the heavy metal contamination remediation measures, enzyme-induced carbonate precipitation (EICP) is an environmentally friendly, efficient, and sustainable measure. Recently, the EICP technology has been widely applied to calcareous sand reinforcement ( Ahenkorah et al, 2021b ; Chen et al, 2021 ; Cui et al, 2021 ; and Meng et al, 2021 ), while studies on the remediation of contaminations, including organic and inorganic contaminants using the EICP technology, are remarkably limited ( Neupane et al, 2013 ; Putra et al, 2016 ; and Moghal et al, 2020a ). During the EICP process, urease catalyzes urea hydrolysis toward producing CO 3 2− .…”

Section: Introductionmentioning

confidence: 99%

Effects of the Urease Concentration and Calcium Source on Enzyme-Induced Carbonate Precipitation for Lead Remediation

et al. 2022

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Heavy metal contamination during the rapid urbanization process in recent decades has notably impacted our fragile environments and threatens human health. However, traditional remediation approaches are considered time-consuming and costly, and the effect sometimes does not meet the requirements expected. The present study conducted test tube experiments to reproduce enzyme-induced carbonate precipitation applied to lead remediation under the effects of urease concentration and a calcium source. Furthermore, the speciation and sequence of the carbonate precipitation were simulated using the Visual MINTEQ software package. The results indicated that higher urease concentrations can assure the availability of CO32− during the enzyme-induced carbonate precipitation (EICP) process toward benefiting carbonate precipitation. The calcium source determines the speciation of carbonate precipitation and subsequently the Pb remediation efficiency. The use of CaO results in the dissolution of Pb(OH)2 and, therefore, discharges Pb ions, causing some difficulty in forming the multi-layer structure of carbonate precipitation and degrading Pb remediation. The findings of this study are useful in widening the horizon of applications of the enzyme-induced carbonate precipitation technology to heavy metal remediation.

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Section: Introductionmentioning

confidence: 99%

Effects of the Urease Concentration and Calcium Source on Enzyme-Induced Carbonate Precipitation for Lead Remediation

et al. 2022

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“…The results of this study showed that the required precipitation for dust control (70%) of sand is less than 15 g CaCO 3 /m 2 between sand grains in bio-treated sand. Meng et al ( 2021a , b ) used MICP technology to control the wind erosion of surface desert soil. The optimal cementation solution (containing equimolar urea and calcium chloride) concentration and spraying volume were 0.2 M and 4 L/m 2 , respectively.…”

Section: Environmental Engineeringmentioning

confidence: 99%

“…Therefore, the MICP technology has been utilized to prevent liquefication of sandy soil, manage the leakage of containers, repair cracks in structures, mitigate seashore erosion, slope failure and heavy metal contamination, etc. (Chu et al 2013 ; Liu et al 2020a ; Tang et al 2020b ; Meng et al 2021a , b ). Compared with traditional engineering technologies, like compaction by rollers or densification by vibroflotation, the MICP technology has less physical impact on the environment.…”

Section: Introductionmentioning

confidence: 99%

Microbial‑induced carbonate precipitation (MICP) technology: a review on the fundamentals and engineering applications

et al. 2023

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The microbial‑induced carbonate precipitation (MICP), as an emerging biomineralization technology mediated by specific bacteria, has been a popular research focus for scientists and engineers through the previous two decades as an interdisciplinary approach. It provides cutting-edge solutions for various engineering problems emerging in the context of frequent and intense human activities. This paper is aimed at reviewing the fundaments and engineering applications of the MICP technology through existing studies, covering realistic need in geotechnical engineering, construction materials, hydraulic engineering, geological engineering, and environmental engineering. It adds a new perspective on the feasibility and difficulty for field practice. Analysis and discussion within different parts are generally carried out based on specific considerations in each field. MICP may bring comprehensive improvement of static and dynamic characteristics of geomaterials, thus enhancing their bearing capacity and resisting liquefication. It helps produce eco-friendly and durable building materials. MICP is a promising and cost-efficient technology in preserving water resources and subsurface fluid leakage. Piping, internal erosion and surface erosion could also be addressed by this technology. MICP has been proved suitable for stabilizing soils and shows promise in dealing with problematic soils like bentonite and expansive soils. It is also envisaged that this technology may be used to mitigate against impacts of geological hazards such as liquefaction associated with earthquakes. Moreover, global environment issues including fugitive dust, contaminated soil and climate change problems are assumed to be palliated or even removed via the positive effects of this technology. Bioaugmentation, biostimulation, and enzymatic approach are three feasible paths for MICP. Decision makers should choose a compatible, efficient and economical way among them and develop an on-site solution based on engineering conditions. To further decrease the cost and energy consumption of the MICP technology, it is reasonable to make full use of industrial by-products or wastes and non-sterilized media. The prospective direction of this technology is to make construction more intelligent without human intervention, such as autogenous healing. To reach this destination, MICP could be coupled with other techniques like encapsulation and ductile fibers. MICP is undoubtfully a mainstream engineering technology for the future, while ecological balance, environmental impact and industrial applicability should still be cautiously treated in its real practice.

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“…When saturated by adsorption, the change of urease activity in leachate tended to be gentle. Urease could not be stored at room temperature for a long time, and the urease activity of the whole solution would decrease after 40 h (Meng et al, 2021). At this point, the effect of fiber adsorption is no longer significant.…”

Section: Solution Analysismentioning

confidence: 99%

Experimental investigation on mechanical behavior of sands treated by enzyme-induced calcium carbonate precipitation with assistance of sisal-fiber nucleation

et al. 2022

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Sisal fibers had obvious advantages of mechanical strength on reinforced enzyme-induced calcium carbonate precipitation (EICP)-cemented loose sands. However, there are few related researches, whose research on strength and toughness is not sufficient, and the analysis on mechanism is lacking. In this article, sisal fiber was used to strengthen EICP-treated sand, and the mechanical properties and underlying mechanism were experimentally explored. The results show that the strength and toughness of EICP-treated sand can be effectively improved by sisal fibers. The optimal sisal fiber length is 10 mm and the optimal fiber content is 0.2%. The wet-dry cycle resistance of the samples is improved simultaneously. Microscopic study showed that the rough surface of sisal fiber provided a large number of nucleation sites for calcium carbonate precipitation and formed an effective “bridge network.” This study reports the potential and the underlying mechanism of sisal fiber on improvement of EICP performance by new test methods and provides new insight into enhancing mechanical behavior of EICP-cemented loose sands with natural fiber.

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Multiple-phase enzyme-induced carbonate precipitation (EICP) method for soil improvement

Cited by 61 publications

References 23 publications

Effects of the Urease Concentration and Calcium Source on Enzyme-Induced Carbonate Precipitation for Lead Remediation

Effects of the Urease Concentration and Calcium Source on Enzyme-Induced Carbonate Precipitation for Lead Remediation

Microbial‑induced carbonate precipitation (MICP) technology: a review on the fundamentals and engineering applications

Experimental investigation on mechanical behavior of sands treated by enzyme-induced calcium carbonate precipitation with assistance of sisal-fiber nucleation

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