Optimization of Cadmium and Zinc Removal from Contaminated Soil by Surfactants Using Mixture Design and Central Composite Rotatable Design

Assawadithalerd, Mongkolchai; Phasukarratchai, Naphatsarnan

doi:10.1007/s11270-020-04704-w

Cited by 6 publications

(2 citation statements)

References 35 publications

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“…Though it has not been widely explored in soil remediation studies, the selection of SLES as a surfactant in this study was based on its availability, its commercial low price (2.07 USD/kg (Assawadithalerd and Phasukarratchai 2020)) and its low toxicity (1995 mg/kg, acute oral toxicity for rats (Walker et al 1967)). In addition, good results were obtained when SLES solutions were used to the removal of pesticides (Ortiz et al 2018), cadmium and zinc (Assawadithalerd andPhasukarratchai 2020), anddiesel (Hernández-Espriú et al 2013) from contaminated soils.…”

Section: Methodsmentioning

confidence: 99%

Archives of Environmental Protection

Aouf,

Dounit

2022

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Soil contamination with hydrocarbons represents a worldwide problem, especially for oil-rich countries. soil contamination becomes inevitable due to different accidents, aboveground spills, and leakage, threatening the fauna and flora. The purpose of this study is to remediate One-year aged contaminated soil with crude oil (23490 mg/kg) using the fluidization technique in a laboratory-scale column. Free water and surfactant solutions were used for washing at different operating conditions. The efficiency of the method was evaluated by the calculation of the total petroleum hydrocarbons (TPH) removal ratio. Without the addition of surfactant, the cleaning operation was not sufficiently efficient, especially at room temperature where the removal ratio was only about 18%. Raising the liquid temperature leads to some improvement where the TPH removal ratio reached 49% at 50°C. With the use of solutions containing Sodium Laureth Sulfate (SLES) as a surfactant, an important enhancement of removal ratio was noted, along with an important reduction in operating time, washing solution volume, and energy consumption. The use of alternatively working/stopping operation mode contributes to the improvement of efficiency. TPH removal ratios up to 99% were obtained under some favorable conditions. This research shows encouraging results for expanding towards the industrial level with clean and sustainable resources.

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Section: Methodsmentioning

confidence: 99%

Archives of Environmental Protection

Aouf,

Dounit

2022

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“…In contrast, phytoextraction and soil washing permanently remove metals from soils. Soil washing using alkaline solvents, organic and inorganic acids, phosphates, surfactants, and chelators has demonstrated remarkable efficiency in reducing heavy metal-contaminated soil [ 3 , 4 , 5 , 6 ]. Furthermore, its simplicity and high speed of operation present soil washing as a potential approach for the remediation of heavy-metal-contaminated soil.…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Washing with an Amino-Acid-Derived Ionic Liquid on the Properties of Cd-Contaminated Paddy Soil

Deng

Wang

Beadham

et al. 2023

Toxics

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To reduce contamination levels in Cd-contaminated paddy soil while retaining soil characteristics, we have studied the Cd-removing ability of 15 different amino acid-based ionic liquids, which are considered to be green solvents, as soil washing agents and their impact on soil. The results indicated that the glycine hydrochloride ([Gly][Cl]) removed the most Cd, and under optimized conditions could remove 82.2% of the total Cd. Encouragingly, the morphology of the soil had not been significantly changed by the washing process. After the soil was rinsed twice with water and the pH was adjusted to 6.2 by adding Ca(OH)2, the germination index of the rice increased by 7.5%. The growth of the rice was also stimulated, with lengths and weights of the rice plants increasing by 56% and 32%, respectively, after two weeks. These experiments demonstrate that amino-acid-derived ionic liquids can be promising soil-washing agents of Cd-contaminated paddy soil.

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