A combined process coupling phytoremediation and in situ flushing for removal of arsenic in contaminated soil

Yan, Xiulan; Liu, Qiuxin; Wang, Jianyi; Liao, Xiaoyong

doi:10.1016/j.jes.2016.10.015

Cited by 22 publications

(7 citation statements)

References 24 publications

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“…Figure 5.3e). Liu et al (2017) also observed Mn high removal efficiency from Spirodela pollyrhiza, which can tolerate Mn at high concentrations of up to 70 mg L -1 and take up 15.75 mg g -1 dry weight. However, in this study a low soil to chemical ratio was used in which KMnO4 reacted completely.…”

Section: Effect Of Oxidising Agents On Phytoremediation Of Soil Leachatementioning

confidence: 71%

“…Aquatic plants have been applied as food for animals or in combination with compost to increase the growth of other plants (van der Siegel et al, 2013;Yao et al, 2017). Other authors have combined phytoremediation and soil washing to improve the soil treatment and metal extraction (Sung et al, 2011;Yan et al 2017), but so far never to treat directly the effluent.…”

Section: Post-treatment Of Soil and Soil Leachatementioning

confidence: 99%

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Novel bioremediation processes for treatment of seleniferous soils and sediment

Wadgaonkar¹

2018

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Section: Effect Of Oxidising Agents On Phytoremediation Of Soil Leachatementioning

confidence: 71%

Section: Post-treatment Of Soil and Soil Leachatementioning

confidence: 99%

Novel bioremediation processes for treatment of seleniferous soils and sediment

Wadgaonkar¹

2018

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“…Researchers have researched and developed a variety of techniques for the remediation of heavy metals in contaminated soil, especially flushing [12], phytoremediation [12,13], excavation and stabilization [5]. Traditional ex-situ restoration methods such as soil replacement and flushing are often cost prohibitive, and require significant capital investment in labor and material resources.…”

Section: Introductionmentioning

confidence: 99%

Remediation of As/Cr co-contaminated soil by electrokinetic coupled with permeable reactive barrier

Fang

Wang

et al. 2021

Environmental Engineering Research

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In this study, the permeable-reactive-barrier (PRB) assisted electrokinetic (EK) was used to remediate As/Cr Cocontaminated soil, aiming to explore the optimal remediation conditions and the migration of As/Cr. The effects of PRB active substance, PRB location, voltage gradient and running time on the migration and transformation of Cr and As in simulated As/Cr contaminated kaolin were studied. The optimal parameters were as follows: PRB position was located near the anode (PRB A, the medium of PRB was hydrocalumite (CaAl-LDH)), initial voltage gradient was 1 V/cm, running time was 96 h. Under the optimal conditions, the removal efficiency of total arsenic (TAs) and total chromium (TCr) were 40.1% and 81.0%, respectively. This indicated that EK can effectively migrate As and Cr, and PRB can effectively adsorb As and Cr. The migration of As tends to both anode and cathode, while Cr tends to migrate towards the anode. The XRD patterns and FTIR spectra confirmed that the As immobilized by CaAl-LDH was mainly adsorbed on the surface, while Cr existed in CaAl-LDH by surface adsorption and intercalation.

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“…Various methods have been employed to remediate heavy metals in soil, such as soil washing, in situ flushing, adsorption, phytoremediation, immobilization techniques (e.g., solidification/stabilization or encapsulation), and electrokinetic extraction [7][8][9][10][11]. In recent years, solidification/stabilization (S/S) of arsenic in contaminated soil has emerged as a promising immobilization technology to remediate contaminated lands [8,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Long-Term Leaching of Arsenic from Arsenic Contaminated and Stabilized Soil Using the Percolation Column Test

2021

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Arsenic in the soil can leach into groundwater and contaminate drinking water, posing a serious risk to human health. The stabilization of arsenic in contaminated soil is one of the immobilization technologies used to remediate contaminated lands. However, few studies have evaluated the long-term release of As and pH changes in stabilized soils. We compared different stabilization techniques in the field by mixing contaminated soil with 5% of either acid mine drainage sludge (AMDS), coal mine drainage sludge (CMDS), steel slag, or cement. We evaluated the results using an up-flow percolation column test to observe any pH changes and As releases from the stabilized soils up to a liquid–solid (L/S) ratio of 50 (approximately representing a 50 year period). At the initial stage of percolation (at an L/S ratio of 0.2 or 0.2 of a year of exposure), some alkaline components and any incompletely bound As in the soils washed out with the eluent. The pH of the cement-stabilized soil was approximately 12 throughout the experiment (up to 50 L/S). Adding stabilizers to the soil reduced As leaching by 54–81% (overall efficiency) compared to the control (contaminated soil only). The order of stabilization efficiency was: steel slag (55.0%) < AMDS (74.3%) < cement (78.1%) < CMDS (81.5%). This study suggests that the groundwater of the stabilized soil should be carefully monitored for the initial five years because the soluble ionic species can leach over this period.

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A combined process coupling phytoremediation and in situ flushing for removal of arsenic in contaminated soil

Cited by 22 publications

References 24 publications

Novel bioremediation processes for treatment of seleniferous soils and sediment

Novel bioremediation processes for treatment of seleniferous soils and sediment

Remediation of As/Cr co-contaminated soil by electrokinetic coupled with permeable reactive barrier

Evaluation of Long-Term Leaching of Arsenic from Arsenic Contaminated and Stabilized Soil Using the Percolation Column Test

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