A Continuous Process of Persulfate Oxidation and Citric acid Washing for the Treatment of Complex-Contaminated Soil Containing Total Recoverable Petroleum Hydrocarbons and Heavy Metals

Soil contamination with petroleum hydrocarbons and heavy metals is a widespread environmental problem. In recent years, cyclodextrin has attracted research interest because of its special hole structure that can form inclusion complexes with certain small molecules. However, the solubility of β-cyclodextrin (β-CD) in water is low and it crystallizes easily, leading to its low utilization in practice. In this experiment, we connected β-CD with glycine under alkaline conditions to prepare glycine-β-cyclodextrin (G-β-CD), which is water soluble, has stronger coordinating ability with heavy metals, and is more suitable for treating oil-contaminated soil. The results show that G-β-CD provides better desorption of petroleum hydrocarbons and heavy metals in soils with low organic matter content (1%) and NaNO3 of 0.25 mol/L at 70 g/L G-β-CD under mildly acidic (pH 5–6) conditions. The results indicate that petroleum hydrocarbons and heavy metals were removed simultaneously by means of pretreatment with G-β-CD, and the results can provide a theoretical basis for remediation of petroleum-contaminated soil.

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Efficiency of lipopeptide biosurfactants in removal of petroleum hydrocarbons and heavy metals from contaminated soil

Environmental Science and Pollution Research ◽

10.1007/s11356-013-1752-4 ◽

2013 ◽

Vol 20 (10) ◽

pp. 7367-7376 ◽

Cited By ~ 57

Author(s):

Anil Kumar Singh ◽

Swaranjit Singh Cameotra

Keyword(s):

Heavy Metals ◽

Contaminated Soil ◽

Petroleum Hydrocarbons ◽

Lipopeptide Biosurfactants

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Washing Batch Test of Contaminated Sediment: The Case of Augusta Bay (SR, Italy)

Applied Sciences ◽

10.3390/app10020473 ◽

2020 ◽

Vol 10 (2) ◽

pp. 473

Author(s):

Lucia Lumia ◽

Maria Gabriella Giustra ◽

Gaspare Viviani ◽

Gaetano Di Bella

Keyword(s):

Heavy Metals ◽

Citric Acid ◽

Petroleum Hydrocarbons ◽

Contact Time ◽

Ph Value ◽

Weight Ratio ◽

Total Petroleum Hydrocarbons ◽

Contaminated Sediment ◽

Ph Values ◽

Removal Efficiencies

Two experimental campaigns were conducted to optimize the applicability of the Sediment Washing treatment on the marine sediments of Augusta Bay contaminated with heavy metals and total petroleum hydrocarbons (TPH). In the first campaign were used EDTA, citric acid, and acetic acid to removal only heavy metals (Ni, Cu, Zn, Cr, and Hg) from the sediments, while in the second campaign EDTA, citric acid, and EDDS were used to removal heavy metals (Ni, Cu, Cr, and Pb) and TPH. The tests were conducted at different pH values and contact times with 1:10 solid:liquid weight ratio. In the first experimental, at pH values 4, contact time 3 h, and citric acid, high removal efficiencies (78–82%) have been obtained for Ni, Cu, Zn, and Cr metals, while, in the second experimental campaign, at pH value 4, contact time 0.5 h, and citric acid, high removal efficiencies have been achieved especially for Pb and TPH. Finally, on the basis of the results obtained, a conceptual sediment washing treatment layout was proposed and the related costs estimated.

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