Electrokinetic remediation of chromium (Cr)-contaminated soil with citric acid (CA) and polyaspartic acid (PASP) as electrolytes

Fu, Rongbing; Wen, Dongdong; Xia, Xiaoqian; Zhang, Wei; Gu, Yingying

doi:10.1016/j.cej.2017.01.092

Cited by 225 publications

(49 citation statements)

References 34 publications

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“…Studies conducted by Kołodyńska (2013) and van Ginkel and Geerts (2016) have demonstrated that N 80% of ISA and 60% of GLDA were degraded within 28 days. Moreover, the alternative chelators are characterized by low potential toxicity (Pinto et al, 2014) and a powerful ability to develop soluble complexes with polyvalent ions over an extensive pH range (Lingua et al, 2014;Suanon et al, 2016;Fu et al, 2017); therefore they may comprise another environmentally-friendly alternative next to EDDS for substitution of persistent EDTA.…”

Section: Introductionmentioning

confidence: 99%

Effect of soil washing with biodegradable chelators on the toxicity of residual metals and soil biological properties

Wang

Zhang

Zhong

et al. 2018

Science of The Total Environment

108

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Soil washing with chelators is a promising and efficient method of remediating metals-contaminated soils. However, the toxicity of residual metals and the effects on soil microbial properties have remained largely unknown after washing. In this study, we employed four biodegradable chelators for removal of metals from contaminated soils: iminodisuccinic acid (ISA), glutamate-N,N-diacetic acid (GLDA), glucomonocarbonic acid (GCA), and polyaspartic acid (PASP). The maximum removal efficiencies for Cd, Pb, and Zn of 85, 55, and 64% and 45, 53, and 32% were achieved from farmland soil and mine soil using biodegradable chelators, respectively. It was found that the capacity of ISA and GLDA to reduce the labile fraction of Cd, Pb, and Zn was similar to that of the conventional non-biodegradable chelator ethylenediaminetetraacetic acid (EDTA). The leachability, mobility, and bioaccessibility of residual metals after washing decreased notably in comparison to the original soils, thus mitigating the estimated environmental and human health risks. Soil β-glucosidase activity, urease activity, acid phosphatase activity, microbial biomass nitrogen, and microbial biomass phosphorus decreased in the treated soils. However, compared with EDTA treatment, soil enzyme activities distinctly increased by 5-94% and overall microbial biomass slightly improved in the remediated soils, which would facilitate reuse of the washed soils. Based on soil toxicity tests that employed wheat seed germination as the endpoint of assessment, the washed soils exhibited only slight effects especially after ISA and GLDA treatments, following high-efficiency metal removal. Hence, ISA and GLDA appear to possess the greatest potential to rehabilitate polluted soils with limited toxicity remaining.

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Section: Introductionmentioning

confidence: 99%

Effect of soil washing with biodegradable chelators on the toxicity of residual metals and soil biological properties

Wang

Zhang

Zhong

et al. 2018

Science of The Total Environment

108

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“…Flexibility of this technology, high energy efficiency, and cost-effectiveness are also merited 14,15 . EK remediation includes the flow of electrical current in the soil, liquid pole electro-osmotic migration, electrical migration of ions, charged particles and colloids, electrolysis of water in the soil in the vicinity of the electrodes, migration of hydrogen and hydroxide ions into the soil resulting in temporary changes in soil pH, gas production at the electrodes, development of the non-uniform electric field, as well as the production of electro-osmotic flow 16,17 . In EK decomposition of water reactions, oxygen and hydrogen ions (H + ) are produced due to oxidation at the anode, while hydrogen gas and hydroxide ions (OH -) are made because of the reduction in cathode 18,19 .…”

Section: Introductionmentioning

confidence: 99%

A Novel Combination of Surfactant Addition and Persulfate-assisted Electrokinetic Oxidation for Remediation of Pyrene-Contaminated Soil

Abtahi

Jorfi

Mehrabi

et al. 2018

Chem.Biochem.Eng.Q.

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Effect of surfactant addition on persulfate-assisted electrokinetic remediation of pyrene-spiked soil was studied. The influence of effective factors including voltage, surfactant addition, moisture content, and persulfate concentration on the removal of initial pyrene concentration of 200 mg kg-1 were investigated. A complete pyrene removal was observed for voltage of 1 V cm-1 , saturated conditions, Tween 80 concentration of 20 mL kg-1 , and persulfate concentration of 100 mg kg-1 after 24 h, corresponding to pyrene mineralization of 61 %, based on TPH analysis. The experimental results were best fitted with pseudo-first-order kinetic model with correlation coefficient of 0.968 and rate constant of 0.191 min −1. The main intermediates of pyrene degradation were benzene o-toluic acid, acetic, azulene, naphthalene and decanoic acid. Finally, an unwashed hydrocarbon-contaminated soil was subjected to persulfate-assisted electrokinetic remediation, and a TPH removal of 38 % was observed for the initial TPH content of 912 mg kg-1 , under the selected conditions.

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“…Several oxyanions forms of Cr 6+ such as HCrO 4 -, CrO 4 2-, and Cr 2 O 7 2may exist as a very mobile form in contaminated soils. Previous study showed that the removed of chromium was lower than 12% from contaminated soil using SEKR (Cameselle and Pena 2016;Fu et al, 2017). Converting Cr 6+ to Cr 3+ is commonly occurs using soil oxidizing agent.…”

Section: Chromium Behavior During the Remediation Of The Pcpss And Thmentioning

confidence: 99%

Behavior of V, Cr, Li, and Ba during electrokinetic pollutant removal: Comparison of PCPSS and VA-PCPSS

Abou-Shady¹,

Eissa²,

Abdelmottaleb³

et al. 2018

Alexandria Science Exchange Journal

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Soil pollution with heavy metals is considered a serious issue affect human, animal, and plant. Owing to the deficiency of water supply in arid and semi-arid areas wastewater may be used in agricultural sector without carrying out the appropriate remediation that may increase pollutants content Recently, we have introduced a new variation of soil electrokinetic remediation (SEKR) known as vertical anode-perforated cathode pipe SEKR system (VA-PCPSS) to overcome obstacles found in the regular PCPSS design. In the present study, the behavior of associated elements existed in anionic and cationic forms such as vanadium (V), chromium (Cr), Lithium (Li), and barium (Ba) during electro-remediation using the PCPSS and the VA-PCPSS techniques was investigated. The results indicated that, the VA-PCPSS did not affect negatively on vanadium distribution throughout soil specimen compared with sever accumulation adjacent to horizontal anode in the PCPSS design. Chromium showed the same behaviors of vanadium during SEKR of heavy metals. Lithium accumulated in the middle of specimen in either the PCPSS or the VA-PCPSS. Barium removal was 50% in the zone adjacent to anode, however sever removal was observed in the subsequent layers of the PCPSS. The application of the VA-PCPSS decreased the removed barium throughout soil, however it accumulated in the zone adjacent to specimen surface.

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Electrokinetic remediation of chromium (Cr)-contaminated soil with citric acid (CA) and polyaspartic acid (PASP) as electrolytes

Cited by 225 publications

References 34 publications

Effect of soil washing with biodegradable chelators on the toxicity of residual metals and soil biological properties

Effect of soil washing with biodegradable chelators on the toxicity of residual metals and soil biological properties

A Novel Combination of Surfactant Addition and Persulfate-assisted Electrokinetic Oxidation for Remediation of Pyrene-Contaminated Soil

Behavior of V, Cr, Li, and Ba during electrokinetic pollutant removal: Comparison of PCPSS and VA-PCPSS

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