Enhanced Electrokinetic Remediation for the Removal of Heavy Metals from Contaminated Soils

Cameselle, Claudio; Gouveia, Susana; Cabo, Adrián

doi:10.3390/app11041799

Cited by 40 publications

(9 citation statements)

References 27 publications

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“…The treatment time of SWR takes only about 120 min to remediate and achieves a removal rate of 80%, but there is some loss of soil nutrients after remediation [ 53 , 54 , 55 ]. EER has low economic efficiency due to its high cost and energy consumption [ 56 , 57 ]. Compared to other techniques, solar-driven interfacial water evaporation remediation was significantly more effective in terms of remediation time and heavy metal ion removal rate.…”

Section: Resultsmentioning

confidence: 99%

Solar-Driven Soil Remediation along with the Generation of Water Vapor and Electricity

et al. 2022

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As a renewable energy source, solar energy has become an important part of human energy use. However, facilities utilizing solar energy are often complex and technically difficult, and preparation equipment and materials are expensive, while these equipment and materials often cause new environmental pollution. Soil, which exists in large quantities on the earth’s surface, is an inexhaustible natural material with loose and stable properties. Due to the specificity of its composition and microscopic form, the soil has an inherent advantage as a medium for solar thermal and photovoltaic conversion. Here, we built an integrated solar energy utilization system, the Integrated Soil Utilization Module (ISUM), integrating multi-functions into one hybrid system, which enables solar-driven water vapor and electricity generation and soil remediation. The evaporation rate of the soil represented by the rocky land was 1.2 kg·m−2·h−1 under 1-sun irradiation with evaporation induced voltage of 0.3 V. With only seven days of continuous exposure to sunlight, the removal of heavy metal ions from the soil reached 90%, while the pH was raised to near neutral. The combined application of readily available natural soil with solar energy not only demonstrates the potential of a soil for solar desalination and power generation, but in addition, solar-driven interfacial evaporation provides an energy-efficient, environmentally friendly, and sustainable method for purifying heavy metal and acid-contaminated soil.

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Section: Resultsmentioning

confidence: 99%

Solar-Driven Soil Remediation along with the Generation of Water Vapor and Electricity

et al. 2022

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“…In previous studies, electrolytes containing chelators, surfactants, and other agents were usually used to increase the efficiency of the removal of contaminants [ 12 , 13 , 14 ]. Table S1 summarizes some operating conditions for EKR taking Zn and other heavy metals as an example [ 7 , 8 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. In laboratory research, the electrolyte chamber is always situated on the ends of the soil chamber.…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic Remediation of Zn-Polluted Soft Clay Using a Novel Electrolyte Chamber Configuration

Sun

Tan

Gong

et al. 2023

Toxics

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This study investigated a novel electrolyte chamber configuration for heavy-metal-contaminated fine-grained soil to reduce the leakage of electrolyte solution and alleviate secondary pollution, finally promoting the electrokinetic remediation (EKR) potential to be scaled up for application. Experiments were conducted on clay spiked with Zn to investigate the feasibility of the novel EKR configuration and the effect of different electrolyte compositions on the electrokinetic remedial efficiency. The results show that the electrolyte chamber situated above the soil surface is promising for the remediation of Zn-contaminated soft clay. Using 0.2 M citric acid as the anolytes and catholytes was an excellent choice for pH control in the soil and the electrolytes. Through this, the removal efficiency in different soil sections was relatively uniform and more than 90% of the initial Zn was removed. The supplementing of electrolytes resulted in the water content in the soil being distributed evenly and finally sustained at approximately 43%. Consequently, this study proved that the novel EKR configuration is suitable for fine-grained soil contaminated with Zn.

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“…Improper management of mine tailings and industrial waste pose major threats to the environment around the globe. Mine tailings usually contain a substantial amount of heavy metals which can cause soil contamination and consequently ground water pollution [1] [2]. Electrokinetic remediation technique is a great promise for remediation of contaminated soils as it has high removal efficiency and time effectiveness [3].…”

Section: Introductionmentioning

confidence: 99%

Electrokinetic Remediation for Heterogeneous Soils

Hassan¹,

Mohamedelhassan²

2023

World Congress on Civil, Structural, and Environmental Engineering

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In this study, heterogeneous soils contaminated with copper were remediated using solar powered electrokinetic treatment. The heterogeneous soils were composed of clay and sand with ratio 2:1. In one soil, a sand layer was sandwiched between two layers of clay while in another sand pockets made 1/3 of the soil mass. The third heterogeneous soil was a clay-sand mixture. An additional test was carried out with homogeneous clay to provide data for contrast. The soil samples were artificially contaminated with 150 mg of copper per kg of dry soil at water content 41% and placed inside four identical electrokinetic cells. Each cell was connected to a solar cell panel with peak voltage gradient 205 V/m. Encouraging results were obtained. Eighty-seven percent of copper was removed from specimen near the anode in the test of the clay-sand mixture compared to 86% in the homogeneous clay test.

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Enhanced Electrokinetic Remediation for the Removal of Heavy Metals from Contaminated Soils

Cited by 40 publications

References 27 publications

Solar-Driven Soil Remediation along with the Generation of Water Vapor and Electricity

Solar-Driven Soil Remediation along with the Generation of Water Vapor and Electricity

Electrokinetic Remediation of Zn-Polluted Soft Clay Using a Novel Electrolyte Chamber Configuration

Electrokinetic Remediation for Heterogeneous Soils

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