Impact of carbonate on the efficiency of heavy metal removal from kaolinite soil by the electrokinetic soil remediation method

Ouhadi, V R; Yong, Raymond N.; Shariatmadari, Nader; Saeidijam, Saeid; Goodarzi, A.; Safari-Zanjani, M.

doi:10.1016/j.jhazmat.2009.08.052

Cited by 88 publications

(40 citation statements)

References 42 publications

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“…Research has shown that the mineral phases of soil (especially the carbonate) had an important influence on soil pH . For NatSoil, it was supposed that the carbonate components hindered the movement of the acid front, resulting in a wider alkaline district in soil …”

Section: Resultsmentioning

confidence: 99%

Comparison of Electrokinetic Remediation on Lead‐Contaminated Kaolinite and Natural Soils

Hou

Yang

et al. 2019

CLEAN Soil Air Water

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Both contaminated natural soil and simulated contaminated kaolinite have been used for electrokinetic remediation (EKR) of toxic metal(s). The objectives of this study are to make a comparison on the EKR performance between lead‐contaminated natural soil (NatSoil) and simulated lead‐contaminated kaolinite (KlnSoil), and to explore the intrinsic mechanism for the discrepancy between these two cases. Results show that the EKR process on NatSoil failed to achieve effective Pb enrichment in any soil section (in total four) with either KNO3 or EDTA‐2Na as the catholyte. However, enrichment ratios (C/C0) of 2.11 and 4.45 are achieved on KlnSoil with the above two electrolytes, respectively. The speciation of Pb in different soil samples, 55.81% of Pb in reducible fraction in NatSoil and 85.06% of Pb in exchangeable and soluble fraction in KlnSoil, are attributed to the significant differences of remediation. The mineral components, cation exchange capacity, acid/base buffering capacity are more complex than that of KlnSoil, hindering the desorption and migration of Pb2+. Increasing the voltage from 2 to 4 V cm−1, pre‐saturating the soil sample with EDTA‐2Na instead of deionized water and prolonging the treatment time from 240 to 480 h successfully enhance the enrichment ratio of Pb at the third soil section to 2.44, 1.70, and 1.69, respectively. The energy consumptions of the remediation processes are also evaluated. Overall, pre‐saturating the soil samples with EDTA‐2Na is the optimal strategy for NatSoil considering the balance between the remediation efficiency and energy consumption.

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Section: Resultsmentioning

confidence: 99%

Comparison of Electrokinetic Remediation on Lead‐Contaminated Kaolinite and Natural Soils

Hou

Yang

et al. 2019

CLEAN Soil Air Water

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“…The change of pH in electrode chambers could affect the migration behavior of metal ions significantly [20]. Fig.…”

Section: Distribution Of Ph In Chambers During Ek Processmentioning

confidence: 99%

Electrokinetic removal of Cu and Zn in anaerobic digestate: Interrelation between metal speciation and electrokinetic treatments

Zhu

Chen

Guo

et al. 2015

Journal of Hazardous Materials

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“…The migration and transport of the cobalt was higher under condition of catholyte conditioning using an acidic solution because cations including metal ions can be easily desorbed into the pore solution from a soil surface in an acidic condition (Ouhadi et al, 2010;Xiu and Zhang, 2009). Hence, these desorbed metal ions can easily be transported by electromigration under an electric field (Probstein and Hicks, 1993;Virkutyte et al, 2002).…”

Section: Cobalt and Lead Distribution After Electrokinetic Treatmentmentioning

confidence: 99%

CATHOLYTE-CONDITIONING ENHANCED ELECTROKINETIC REMEDIATION OF Co AND Pb POLLUTED SOIL

Bahemmat

Farahbakhsh

2015

Environ. Eng. Manag. J.

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The feasibility of catholyte-conditioning to enhance the electrokinetic (EK) remediation of cobalt and lead polluted soil has been investigated in this study. Electrokinetic experiments were conducted using an EK cell 10 cm in width, 10 cm in height, and 50 cm in length. Plate type electrode of graphite was used as electrode material. Two experiments were conducted under constant voltage condition (2 V/cm). The pH values of the soil significantly affect the removal of Co and Pb ions. Due to electrolysis reaction, soil pH increases near the cathode and without pH conditioning, metals precipitate as hydroxides. This problem is solved by the addition of nitric acid (0.1N) in the catholyte compartment. Significant movement of metals was observed through the soil with high removal efficiency. Results showed that catholyte conditioning using nitric acid increased the removal of cobalt and lead from the soil and, consequently, the maximum removal achieved was 73.84% and 62.88% for cobalt and lead, respectively. These EK tests indicate that the increased experimental time induced a higher removal efficiency of cobalt and lead. The results suggest that longer treatment periods will result in further transport of cobalt and lead in the sample. Also, it indicated that the highest quantities of cobalt and lead moved towards the catholyte, particularly at upper 5 cm. On the basis of the experimental results, we conclude that the electrokinetic remediation, using 0.1N HNO 3 as catholyte-conditioning, is suitable for extracting cobalt and lead from polluted soil.

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Impact of carbonate on the efficiency of heavy metal removal from kaolinite soil by the electrokinetic soil remediation method

Cited by 88 publications

References 42 publications

Comparison of Electrokinetic Remediation on Lead‐Contaminated Kaolinite and Natural Soils

Comparison of Electrokinetic Remediation on Lead‐Contaminated Kaolinite and Natural Soils

Electrokinetic removal of Cu and Zn in anaerobic digestate: Interrelation between metal speciation and electrokinetic treatments

CATHOLYTE-CONDITIONING ENHANCED ELECTROKINETIC REMEDIATION OF Co AND Pb POLLUTED SOIL

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