Sandbox modelling of interactions of landslide deposits with terrace sediments aided by field observation

Cheng, Wen-Chieh; Duan, Zhao; Xue, Zhong-Fei; Wang, Lin

doi:10.1007/s10064-021-02144-2

Cited by 15 publications

(7 citation statements)

References 49 publications

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“…In the past few decades, remediation methods including replacement, soil flushing, electrokinetic remediation, chemical precipitation, ion exchange, and phytoremediation were developed (Mena et al, 2016;Kumari et al, 2017;Kumari et al, 2018;Chen and Achal, 2019;Duarte-Nass et al, 2020;Ahenkorah et al, 2021;Hu L. et al, 2021;Jiang et al, 2021). However, they are usually time-consuming and may cause secondary pollution (Achal et al, 2012;Nancharaiah et al, 2016;Kappaun et al, 2018;Xue et al, 2022;Yan et al, 2021;Duan et al, 2021a;Cheng et al, 2021;Duan et al, 2021b). Furthermore, heavy metal ions may be re-released into surrounding environments when subjected to the change in environmental conditions (Hu et al, 2021b;Bai et al, 2017;Bai et al, 2021;Xue et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

The Effect of Calcium Source on Pb and Cu Remediation Using Enzyme-Induced Carbonate Precipitation

Wang

Cheng

Xue

2022

Front. Bioeng. Biotechnol.

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Heavy metal contamination not only causes threat to human health but also raises sustainable development concerns. The use of traditional methods to remediate heavy metal contamination is however time-consuming, and the remediation efficiency may not meet the requirements as expected. The present study conducted a series of test tube experiments to investigate the effect of calcium source on the lead and copper removals. In addition to the test tube experiments, numerical simulations were performed using Visual MINTEQ software package considering different degrees of urea hydrolysis derived from the experiments. The remediation efficiency degrades when NH4+ and OH− concentrations are not sufficient to precipitate the majority of Pb2+ and Cu2+. It also degrades when CaO turns pH into highly alkaline conditions. The numerical simulations do not take the dissolution of precipitation into account and therefore overestimate the remediation efficiency when subjected to lower Pb(NO3)2 or Cu(NO3)2 concentrations. The findings highlight the potential of applying the enzyme-induced carbonate precipitation to lead and copper remediations.

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Section: Introductionmentioning

confidence: 99%

The Effect of Calcium Source on Pb and Cu Remediation Using Enzyme-Induced Carbonate Precipitation

Wang

Cheng

Xue

2022

Front. Bioeng. Biotechnol.

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“…), respectively; S w and S g are pore water and pore gas saturation; and v w , v s , and v g are the velocity vectors of pore water, solid substrate, and pore gas (LT −1 ), respectively. Considering the effect of gravity, the velocity of the pore water as well as pore gas phase to the solid substrate can be expressed as [23][24][25][26]…”

Section: Coupled Governing Equations For Unsaturated Soilsmentioning

confidence: 99%

Thermo-Hydromechanical Coupling Responses Driven by a Central Heat Source in Unsaturated Soils

Wang¹,

Liu²,

Chen

2022

Advances in Materials Science and Engineering

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Based on the thermodynamic and thermoelastic theory, the coupled governing equations of deformation, heat transfer, and moisture migration in unsaturated soils were given. The coupled calculation process was realized by the finite element method. The hydrothermal coupling characteristics of two cases of unsaturated kaolin clay were studied by using a self-developed test device, and the test results were compared with the numerical results. The results showed that when the initial saturation of the soil is high, the volumetric water content of the measured point increases, and then it is in a stable state during the heating process. When the initial saturation is low, the volumetric water content near the heat source increases firstly and then decreases during the heating process. The rise and fall of temperature make the volumetric water content of the soil irreversible. The volumetric water content of each measured point is lower than the initial state. The closer it is to the internal measured heat source, the more obvious this phenomenon is; the lower the initial saturation is, the more obvious it is.

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“…The mobility or solubility of heavy metals can transform them from the solid phase to the solution phase, thereby increasing their bioavailability ( Bolan et al, 2014 ; Bai et al, 2020 , Bai et al, 2021c ; Yang et al, 2021 ; Xue et al, 2022 ). Therefore, immobilizing heavy metals is considered to be of great necessity in order to reduce their bioavailability ( Li et al, 2013 ; Khadim et al, 2019 ; Cheng et al, 2021 ; Hu et al, 2021 ; Hu et al, 2022 ; Wang et al, 2022; Wang et al, 2022 ; Wang et al, 2022 ). To this end, chemical precipitation, electroremediation, and ion-exchange and adsorption have been widely adopted as countermeasures.…”

Section: Introductionmentioning

confidence: 99%

Effects of Bacterial Culture and Calcium Source Addition on Lead and Copper Remediation Using Bioinspired Calcium Carbonate Precipitation

Xue

Cheng

Wang

et al. 2022

Front. Bioeng. Biotechnol.

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Lead and copper ions from wastewater induced by metallurgical processes are accumulated in soils, threatening plant and human health. The bioinspired calcium carbonate precipitation is proven effective in improving the cementation between soil particles. However, studies on capsulizing heavy metal ions using the bioinspired calcium carbonate precipitation are remarkably limited. The present study conducted a series of test tube experiments to investigate the effects of bacterial culture and calcium source addition on the remediation efficiency against lead and copper ions. The calcium carbonate precipitation was reproduced using the Visual MINTEQ software package to reveal the mechanism affecting the remediation efficiency. The degradation in the remediation efficiency against lead ions relies mainly upon the degree of urea hydrolysis. However, higher degrees of urea hydrolysis cause remediation efficiency against copper ions to reduce to zero. Such high degree of urea hydrolysis turns pH surrounding conditions into highly alkaline environments. Therefore, pursuing higher degrees of urea hydrolysis might not be the most crucial factor while remedying copper ions. The findings shed light on the importance of modifying pH surrounding conditions in capsulizing copper ions using the bioinspired calcium carbonate precipitation.

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Sandbox modelling of interactions of landslide deposits with terrace sediments aided by field observation

Cited by 15 publications

References 49 publications

The Effect of Calcium Source on Pb and Cu Remediation Using Enzyme-Induced Carbonate Precipitation

The Effect of Calcium Source on Pb and Cu Remediation Using Enzyme-Induced Carbonate Precipitation

Thermo-Hydromechanical Coupling Responses Driven by a Central Heat Source in Unsaturated Soils

Effects of Bacterial Culture and Calcium Source Addition on Lead and Copper Remediation Using Bioinspired Calcium Carbonate Precipitation

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