Effective remediation of heavy metals in contaminated soil by electrokinetic technology incorporating reactive filter media

Ghobadi, Romina; Altaee, Ali; Zhou, John L.; Karbassiyazdi, Elika; Ganbat, Namuun

doi:10.1016/j.scitotenv.2021.148668

Cited by 38 publications

(3 citation statements)

References 50 publications

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“…EDTA also increase metal solubility by connecting to metals that can desorb metals (Zhang et al, 2014) especially in high pH soils (Chang et al 2007). It is likely that Ni, Cd, and Zn were relatively easy to extract; in contrast, Pb is more di cult to remove (Ghobadi et al, 2021). Although electric current increased the solubility of Pb (Table 7), no signi cant effect was observed on Pb removal at different electric current levels (Fig.…”

Section: Pb Fractionsmentioning

confidence: 96%

Electrical approach for decontaminating a multi-metal polluted soil as influenced by electrolyte type and soil position

Keshavarz

Ghasemi-Fasaei

Ronaghi

et al. 2022

Preprint

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The remediation of heavy metals contaminated soils is increasingly a global problem with serious implications for human health. This study aimed to evaluate the in-situ remediation performance of multi element contaminated soil by the electrokinetic. To achieve this, the effects of chelating agents (water, ethylenediamine tetraacetic acid (EDTA), diethylenetriamine pentaacetic acid (DTPA)), potential gradient (0, 1, and 2 V cm− 1), and position of soil in electrokinetic cell on metals fractions and metals removal were investigated. The results revealed that the electric potential difference and application of EDTA or DTPA electrolyte generally enhanced heavy metals removal efficiency and for Ni and Pb the interactions effects of these factors were significantly positive. Results showed that Ni, Zn, Cd, and Pb removal efficiency is highest with DTPA, DTPA, EDTA and EDTA electrolytes, respectively. In particular, the usage of electric current remarkably shifted the soil-metal bonds from stable (residual) to a less stable (mobile and mobilisable) fraction. The optimum electric current for the removal of Zn, Cd, and Ni was 1, 1, and 2 V cm− 1, respectively, which removed 44, 47 and 41% of the average of these heavy metals in soil, respectively. Results of present study demonstrated that removal efficiency was highly metal-dependent; and the order of metals removal was Cd > Ni > Zn > Pb.

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Section: Pb Fractionsmentioning

confidence: 96%

Electrical approach for decontaminating a multi-metal polluted soil as influenced by electrolyte type and soil position

Keshavarz

Ghasemi-Fasaei

Ronaghi

et al. 2022

Preprint

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“…The water solubility of pollutants is increased by biosurfactants' unusual molecular structure, which contains both hydrophobic and hydrophilic components, resulting in their desorption from the soil (Mao et al 2015). Biosurfactants, thus, have good solubilization potential while retaining more negligible adsorption onto the soil, thereby effectively enhancing the removal of these adsorbed contaminants (Ghobadi et al 2021). Ultrafiltration at the reactor scale is considered the most useful method to concentrate surfactin and rhamnolipid.…”

Section: Removal Of Heavy Metals and Hydrocarbonsmentioning

confidence: 99%

Extraction, purification and applications of biosurfactants based on microbial-derived glycolipids and lipopeptides: a review

et al. 2021

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Microbial biosurfactants are sustainable alternatives for synthetic counterparts, and display high biodegradability, environmental compatibility, and high selectivity. While previous reports have focussed on production yield, little attention has been paid on downstream processing of biosurfactants, a critical step that controls quality. Here we review methods for biosurfactant downstream processing with focus on glycolipids and lipopeptidesglycolipids and lipopeptides. Solvent extraction, foam fractionation, and sweep floc coagulation allow to reach a purity of 55-70%. While distillation can be implemented prematurely, methods like ultrafiltration and chromatography are used as final processing to recover 90-95% of biosurfactant with 78-95% of purity. We present the cheapest and most efficient downstream techniques for industries to achieve acceptable product quality. This paper puts forth the environmental applications of biosurfactants. We review applications in treating hydrophobic organic pollutants and heavy metals in soils and water. The removal efficiency of biosurfactants reaches 96%. Biosurfactants in the detergent industry, microbial enhanced oil recovery, and soil washing are also discussed.

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“…The energy consumption was calculated by using the values of periodically measured (after every 15 min) electric current intensity and the applied DC electric potential (9 V) for different experimental times (i.e., 6, 12, 24, 48, and 72 h). The energy consumption per unit volume was calculated by using the equation (4)[57].Where E V is the energy consumed per unit volume of soil [kW-hr m -, E is the energy consumed [W-hr], V is the volume of soil [m 3 ], U is the applied electric potential [V], I is the electric current [A] and t is the electrokinetic treatment time [hr.]. Note that the volume of each soil specimen was ∼ 2.55 × 10 −4 m 3 .…”

mentioning

confidence: 99%

Effect of electrokinetic treatment time on energy consumption and salt ions removal from clayey soils

Hussain

Kamran

Hina

et al. 2023

Mater. Res. Express

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Electrokinetics effectively removes contaminants, but its field-scale applications are limited mainly due to its high energy cost. In previous studies, the energy consumption was determined either by changing the soil's specimens initial salt concentration while keeping the treatment time fixed or by changing the treatment time and keeping the same initial salt concentrations for all the specimens. Since both the initial salt concentration and treatment time are important parameters in determining reclamation cost, therefore, in this study, the soil specimens intentionally contaminated with different concentrations of sodium chloride (NaCl), i.e., varying from 3.7 to 15.5 g/kg, were exposed to a constant DC electric field of 1V/cm for different time durations, i.e., varying from 6 to 72 hrs. The results show that electroosmotic flow (EOF) was directed from the anode to the cathode and higher for specimens contaminated with relatively low salt concentration, i.e., up to 7.6 g/kg. Therefore, for these specimens, due to the combined effect of electroosmosis and electromigration, the removal of Na+ was higher than the Clˉ. However, for the specimen contaminated with a higher salt concentration, i.e., 15.5 g/kg, the Clˉ removal exceeded Na+ due to the marginalization of EOF. Regardless of initial salt concentration, the electroosmotic flow and salt ions removal rates decreased with increasing treatment time, which might be attributed to the development of acidic and alkaline environments in soil. The collision of acidic and alkaline fronts resulted in a large potential gradient in a narrow soil region of pH jump, diminishing it everywhere else. This nonlinearity in the electric potential distribution in soil reduced the EOF and electromigration of salt ions.

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Effective remediation of heavy metals in contaminated soil by electrokinetic technology incorporating reactive filter media

Cited by 38 publications

References 50 publications

Electrical approach for decontaminating a multi-metal polluted soil as influenced by electrolyte type and soil position

Electrical approach for decontaminating a multi-metal polluted soil as influenced by electrolyte type and soil position

Extraction, purification and applications of biosurfactants based on microbial-derived glycolipids and lipopeptides: a review

Effect of electrokinetic treatment time on energy consumption and salt ions removal from clayey soils

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