The removal efficiency of lead from contaminated soil: modeling of cations and anions migration during the electrokinetic treatment

A series of electrokinetic experiments were conducted on fluorine-contaminated soil with different anolyte (NaOH) concentrations in a self-made electrolyzer to investigate the effects of anolyte concentration on removal of fluorine. Experimental results showed that anolyte concentration (0.1mol L-1) was more suitable of the six anolyte concentration tested, in contrast to the removal efficiency of fluorine and the cost of the high concentration of anolyte. On this anolyte concentration that 57.75% fluorine could be removed from contaminated soil within 10 days under the applied voltage (1.0 V cm-1). The results also indicated that electromigration was a dominant transport mechanism responsible for the removal of fluorine from contaminated soil than electroosmosis.

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Impacts of Changing Operational Parameters of In Situ Chemical Oxidation (ISCO) on Removal of Aged PAHs from Soil

Journal of Advanced Oxidation Technologies ◽

10.1515/jaots-2012-0223 ◽

2012 ◽

Vol 15 (2) ◽

Cited By ~ 1

Author(s):

Paula Cajal-Mariñosa ◽

Ruth G. de la Calle ◽

F. Javier Rivas ◽

Tuula Tuhkanen

Keyword(s):

Hydrogen Peroxide ◽

Removal Efficiency ◽

Contaminated Soil ◽

Chemical Oxidation ◽

Contaminant Removal ◽

Operational Parameters ◽

In Situ Chemical Oxidation ◽

Different Types ◽

Wood Impregnation

AbstractThe removal efficiency of two different types of peroxide addition, catalyzed hydrogen peroxide (CHP) and sodium percarbonate (SPC) were compared on a highly PAH-contaminated soil from a wood impregnation site. In an attempt to simulate real in situ reagents delivery, experiments have been carried out in acrylic columns. The main parameters affecting contaminant removal were the reagent’s temperature and the total addition of peroxide (g

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Effect of chelating agents on removal of 137Cs from contaminated soil

Iraqi Journal of Physics (IJP) ◽

10.30723/ijp.v15i35.65 ◽

2018 ◽

Vol 15 (35) ◽

pp. 158-168

Author(s):

Firas M. Radhi

Keyword(s):

Removal Efficiency ◽

Contaminated Soil ◽

Chelating Agents ◽

Soil Samples ◽

Coarse Grained ◽

Tetraacetic Acid ◽

Mixing Ratio ◽

Soil Mixing ◽

Chemical Washing ◽

Washing Method

In the present research, the chemical washing method has been selected using three chelating agents: citric acid, acetic acid and Ethylene Diamine Tetraacetic Acid (EDTA) to remove 137Cs from two different contaminated soil samples were classified as fine and coarse grained. The factors that affecting removal efficiency such as type of soil, mixing ratio and molarity have been investigated. The results revealed that no correlation relation was found between removal efficiency and the studied factors. The results also showed that conventional chemical washing method was not effective in removing 137Cs and that there are further studies still need to achieve this objective.

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Enhanced Electrokinetic Remediation of Cadmium (Cd)-Contaminated Soil With Interval Power breaking

10.21203/rs.3.rs-774163/v1 ◽

2021 ◽

Author(s):

Zongping Cai ◽

Yan Sun ◽

Yanghong Deng ◽

Xiaojie Zheng ◽

Shuiyu Sun ◽

...

Keyword(s):

Removal Efficiency ◽

Power Supply ◽

Contaminated Soil ◽

Laboratory Experiments ◽

Electrokinetic Remediation ◽

Charged Species ◽

Continuous Power ◽

Cd Removal ◽

Cd Species ◽

Soil Cd

Abstract This study compared electrokinetic (EK) remediation with and without interval power breaking in the removal of total and plant available cadmium (Cd) in the soil. Two laboratory experiments, i.e. EK remediation with interval power breaking (24-12 h power-on-off cycles) and conventional EK remediation (continuous power supply) with the same accumulated time (192 h) of power supply were conducted to remove soil Cd. After the EK remediation by interval power breaking, the total Cd removal efficiency in the soil rose to 38%, in comparison to 28% by the conventional EK remediation. As for the plant available Cd, the removal efficiency was enhanced from 52% to 63%. Additionally, the electric current during the EK remediation and electric conductivity after the EK remediation were higher in the soil treated by interval power breaking, which indicated an enhanced desorption and/or migration of charged species. It further meant that the higher removal efficiency of soil Cd by interval power breaking could be related to the enhanced desorption and/or migration of Cd species. This study indicated that both conventional EK remediation and EK remediation with interval power breaking were effective methods to remove soil Cd but EK remediation with interval power breaking was more efficient.

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Removal of fluorine from contaminated soil by electrokinetic treatment driven by solar energy

Environmental Science and Pollution Research ◽

10.1007/s11356-013-1595-z ◽

2013 ◽

Vol 20 (8) ◽

pp. 5806-5812 ◽

Cited By ~ 8

Author(s):

Ming Zhou ◽

Shufa Zhu ◽

Yana Liu ◽

Xuejian Wang

Keyword(s):

Solar Energy ◽

Contaminated Soil ◽

Electrokinetic Treatment

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Selecting an Effective Extractant for Removing Cr from Contaminated Soil

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.183-185.1437 ◽

2011 ◽

Vol 183-185 ◽

pp. 1437-1441 ◽

Cited By ~ 1

Author(s):

Li Li Liang ◽

Shu Cai Li ◽

Gang Li ◽

Xue Lian Yang ◽

Bo Wu ◽

...

Keyword(s):

Removal Efficiency ◽

Contaminated Soil ◽

Sodium Citrate ◽

Complexing Agents ◽

Chromite Ore Processing Residue ◽

Chromite Ore ◽

Ore Processing ◽

Initial Soil ◽

Mineral Matrix ◽

Cr Removal

The effects of various extractants removing Cr from the soil of chromite ore processing residue (COPR) deposited sites were studied in order to select the optimal extractant agent. The effects of this agent on the removal of Cr(VI) and Cr(III) in the contaminated soil were also investigated. The results showed that organic complexing agents had higher removal efficiency than that of inorganic complexing agents due to the high content of Cr(III) in the soil(90.3%). The Cr removal of citric/sodium citrate (mole ratio: 1:1) was 35.95% in 24h. The reason why citric/sodium citrate removed more Cr than other agents is that citric can solubilize the mineral matrix, compete for the surfaces sites to desorb Cr(VI) and remove Cr(III) by its complexation. The concentration radio of Cr(VI) and Cr(III) in the initial soil was 0.11. Thus improving the removal of Cr(III)is the key point of improving the total Cr removal.

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Penghilangan Senyawa Fenol Oleh Bakteri Yang Diisolasi dari Area Pertambangan Minyak Bumi

Jurnal Teknologi Lingkungan ◽

10.29122/jtl.v17i2.1067 ◽

2016 ◽

Vol 17 (2) ◽

pp. 126 ◽

Cited By ~ 1

Author(s):

Joko Prayitno

Keyword(s):

Removal Efficiency ◽

Contaminated Soil ◽

Phenol Removal ◽

Pseudomonas Sp ◽

Bacillus Sp ◽

Bacterial Strains

The aim of this research was to study the effectiveness of local bacterial strains from oil-contaminated soil to degrade phenol. The study consisted of two experiments, using six individual strains and using mix of strains. Bacterial strains used in the first experiment were 1.3, 3.3 dan 8.2.1 (Bacillus sp.), strain 3.2 (Propionibacterium), strain 3.4 (Pseudomonas sp.), and strain 8.1.2 (Enterobacter sp.).Bacterial strains used in the second experiment were mix of all six strains (K6) and mix of three strains (K3) consisted of strain 3.4, 8.1.2 and 8.2.1 with the same ratio. The experiments were conducted in 100 mL Bushnell and Haas medium containing 300-400 ppm phenol for three days.Three strains (strain 3.4, 8.1.2, dan 8.2.1) had the highest phenol removal efficiency at day 3, i.e. 99-100%. COD values were decreased to 345-393 mg/L or 56-61.3% by those three strains. Mix culture K6 effectively removed phenol form the medium, but COD value decreased to only 56.7%. The fate of COD decrease was not the same as phenol removal by these strains (either in idividual or mix cultures), because phenol was degraded into intermediate compounds.

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