A mini review of enzyme-induced calcite precipitation (EICP) technique for eco-friendly bio-cement production

Kidanemariam, Tekleweyni Gebremicael; Gebru, Kibrom Alebel; Kidane Gebretinsae, Haile

doi:10.1007/s11356-023-31555-9

Cited by 5 publications

(3 citation statements)

References 29 publications

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“…The lead-contaminated loess was air-dried at room temperature for one month to obtain the untreated heavy metal lead-contaminated loess. In the application of EICP technology, 1 M urea and 0.67 M CaCl 2 were combined in deionized water, and then mixed with the lead-contaminated loess along with 3 g/L urease [27,28]. For EICP technology without a calcium source, a 1M urea solution was mixed with the lead-contaminated loess and 3 g/L urease.…”

Section: Specimen Preparationmentioning

confidence: 99%

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Feasibility Study of Applying Enzyme-Induced Carbonate Precipitation (EICP) without Calcium Source for Remediation of Lead-Contaminated Loess

Zhang,

Zhang

2024

Buildings

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To assess the long-term stability of lead-contaminated loess treated with calcium-free Enzyme-Induced Carbonate Precipitation (EICP) technology while avoiding significant soil strength increases, various parameters such as the pH value, heavy metal ion leaching rate, and soil heavy metal speciation were evaluated. This study investigated the remediated soil’s stability under complex environmental conditions, including dry–wet cycles and acid rain leaching. The intrinsic mechanisms were elucidated through the Zeta potential, scanning electron microscopy (SEM), and X-ray diffraction (XRD) analyses. The results showed that compared to the untreated lead-contaminated loess, the surface strength of the loess treated with EICP technology increased by 3.86 times, with a 1.47-fold increase observed with the calcium-free EICP treatment. Carbonate precipitation improved the erosion resistance by adsorbing or coating fine particles and forming bridging connections with coarse particles. As the number of dry–wet cycles increased, the soil pH gradually decreased but remained above 8.25. The heavy metal leaching rate increased with the leaching cycles until reaching a plateau. The acid rain influence showed a decrease in the Pb2+ content in the leachate as the acid rain solution pH increased, meeting hazardous waste disposal regulations. These findings offer new insights for improving heavy metal-contaminated loess site remediation and understanding the underlying geochemical mechanisms.

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Section: Specimen Preparationmentioning

confidence: 99%

“…The exchangeable form is considered biologically active and is a major concern for biological toxicity. Liu et al [27] used the Tessier five-step extraction method and an inductively coupled plasma spectrometer to identify the forms of heavy metal ions occurring in their study.…”

Section: Analysis Of Speciation Formsmentioning

confidence: 99%

Feasibility Study of Applying Enzyme-Induced Carbonate Precipitation (EICP) without Calcium Source for Remediation of Lead-Contaminated Loess

Zhang,

Zhang

2024

Buildings

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“…The techniques have been widely applied to foundation stabilization [ 15 ], liquefaction treatment [ 16 ], rock and earth mass seepage control [ 17 ], wind prevention and sand fixation [ 18 ], polluted soil repair [ 13 ], and other fields. Kidanemariam et al [ 19 ] elaborated on the principle and applicability of the EICP technology and introduced its applications in dust control, self-repairing concrete, and small-volume pavement renovation. Cui et al [ 20 ] adopted a single-phase low-pH EICP treatment to improve soil.…”

Section: Introductionmentioning

confidence: 99%

Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)

Li,

Yan,

Liu

et al. 2024

Materials

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As an emerging repair method, the enzyme-induced calcium carbonate precipitation (EICP) technique has the advantages of being highly economical, eco-friendly, and durable. The optimal repair conditions were obtained by taking cement mortar as the research object, adding two types of filling medium, using three EICP-based repair methods to repair the cement mortar with different crack widths, and combining ultrasonic testing and strength testing to evaluate the mechanical properties and repair effects of the repair mortar. The microscopic structure of the mortar was established using mesoscopic and microscopic tests (XRD, SEM, and EDS), thereby revealing the mechanism of repair based on EICP. The test results show that, when quartz sand is used as the repair medium, more calcium carbonate adheres to the cross-section of test samples, and it has a better repair effect. Moreover, the repair effect of the injection method is significantly higher than those of the perfusion and immersion methods, and the ultrasonic wave transit time decreases by 1.22% on average. Based on the combination of quartz sand and EICP repair methods, the calcium carbonate precipitated among the sand granules contributes to a binding effect that strengthens the cohesive force among the sand granules.

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Comparative study on the effect of SRB and Sporosarcina pasteurii on the MICP cementation and solidification of lead–zinc tailings

Yang,

Liu,

Dong

et al. 2024

Chemical Engineering Journal

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A mini review of enzyme-induced calcite precipitation (EICP) technique for eco-friendly bio-cement production

Cited by 5 publications

References 29 publications

Feasibility Study of Applying Enzyme-Induced Carbonate Precipitation (EICP) without Calcium Source for Remediation of Lead-Contaminated Loess

Feasibility Study of Applying Enzyme-Induced Carbonate Precipitation (EICP) without Calcium Source for Remediation of Lead-Contaminated Loess

Study on the Mechanical Properties of Crack Mortar Repaired by Enzyme-Induced Calcium Carbonate Precipitation (EICP)

Comparative study on the effect of SRB and Sporosarcina pasteurii on the MICP cementation and solidification of lead–zinc tailings

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