Remediation of soils polluted with lindane using surfactant-aided soil washing and electrochemical oxidation

Muñoz-Morales, M.; Braojos, M.; Sáez, Cristina; Cañizares, Pablo; Rodrigo, Manuel A.

doi:10.1016/j.jhazmat.2017.06.021

Cited by 73 publications

(55 citation statements)

References 44 publications

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“…Even with these high concentrations, most of the PCE is contained in the interphase. In comparing these results with those obtained in the treatment of clopyralid or, more recently, with lindane using the same technology, it should be remarked that in this case the process is clearly more complicated. Thus, in the first case, the pollutant was released completely to the SWF (without needing a surfactant to improve the efficiency) and in the second case (in which the same surfactant was used), almost no interphase was detected so the clarified liquid contained most of the pollutant after the treatment.…”

Section: Resultssupporting

confidence: 63%

“…However the concentrations of hypochlorite were much lower than those of the oxidants produced. This indicates that in addition to this oxochlorinated anion, other oxidants were being formed in the reaction media, persulfate being the most plausible species as it also has been pointed out in the literature …”

Section: Resultsmentioning

confidence: 56%

“…) even in the first faster zone. On the contrary, the removal seems to be more efficient than the removal of lindane obtained by soil washing with the same SDS:pollutant ratio, confirming the good performance of the electrolysis for the treatment of this pollutant . In addition, during that electrolysis of lindane, the same two zones were observed pointing out the similarities between performance of the technology with two very different pollutants.…”

Section: Resultsmentioning

confidence: 99%

“…A colorimetric method was used to determine the concentration of the SDS surfactant . The anions present in the target wastewater were characterized using ion chromatography by means of a Shimadzu LC‐20A system …”

Section: Methodsmentioning

confidence: 99%

“…The development of efficient technologies for the remediation of soils polluted with organochlorinated species remains a very important environmental issue and has prompted the goal of this work, to evaluate the removal of PCE from spiked soils polluted also with oils (to simulate a real, industrial PCE‐polluted soil) by using SASW and electrolysis with diamond anodes. This combined treatment was successfully applied for the remediation of soils polluted with clopyralid and lindane in previous works of our group, two species with very different properties to those exhibited by PCE, which is typically associated with the presence of oils. In these conditions, the complexity is higher due to the presence not only of soluble species, but also of micelles of SDS with PCE and oils.…”

Section: Introductionmentioning

confidence: 99%

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Anodic oxidation for the remediation of soils polluted with perchloroethylene

Muñoz-Morales

Sáez

Cañizares

et al. 2018

J of Chemical Tech & Biotech

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BACKGROUND This work focuses on the removal of perchloroethylene (PCE) from soils spiked with this hazardous chlorinated hydrocarbon and oil by a combination of two technologies: soil washing and anodic oxidation with diamond electrodes. The first attains the transfer of the pollutant from the soil to a soil washing fluid (SWF), from which the organics are then efficiently removed. RESULTS Results show that high concentrations of sodium dodecyl sulphate (SDS) are required in the SWF for an efficient extraction of the chlorinated hydrocarbon and electrolysis has to be applied not only to the clarified liquid, but also to the interphase. The surfactant used interacts strongly with soil not only during the washing, but also during the electrolysis step. This interaction seems to play a protective role against the oxidation of SDS. The initial phase of the electrolysis is rather complex and there are several processes which modify the results importantly. CONCLUSIONS Removal of PCE by electrolysis from soil is less efficient than its removal from synthetic solutions of this chlorinated pollutant. There are two first‐order kinetic zones, which indicate an important competition for the oxidation of the different organics contained in the SWF during the electrolysis. © 2018 Society of Chemical Industry

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Section: Resultssupporting

confidence: 63%

Section: Resultsmentioning

confidence: 56%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Anodic oxidation for the remediation of soils polluted with perchloroethylene

Muñoz-Morales

Sáez

Cañizares

et al. 2018

J of Chemical Tech & Biotech

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Environmental Applications of Boron‐Doped Diamond Electrodes: 2. Soil Remediation and Sensing Applications

et al. 2019

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The chemical stability and electrocatalytic properties of boron‐doped diamond (BDD) electrodes give rise to various applications. While wastewater treatment is the most widely studied field, the use of BDD for soil remediation and environmental sensing is currently investigated more and more. With regards to soil remediation, promising results have been reported for the treatment of soil washing solutions. Anodic oxidation using BDD at high current density allows high mineralization rates of biorefractory soil pollutants and extracting agents to be reached. At low current density, selective degradation of target pollutants has been achieved, thus allowing the reuse of extracting agents for further soil washing steps. BDD‐based electrochemical sensors have been studied for chemical oxygen demand determination, pesticide/pharmaceutical detection as well as other applications such as pH, O2 and analysis of various organic and inorganic compounds. Low detection limits, wide linear ranges and low standard deviations have been achieved. The main reasons behind the superiority of BDD sensors are the chemical stability, wide applicability and resistance of BDD towards biofouling. The beauty of BDD sensing is that it can work for a variety of organic and inorganic compounds under many physicochemical parameters.

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Recyclable dynamic imine‐based nonionic surfactants and potential use in postprocessing of eluted emulsions

Liu

Sun

Chen

et al. 2023

J Surfact & Detergents

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Recovery of surfactants and retrieval of hydrocarbons from eluted emulsions in surfactant‐enhanced washing are essential to save useful resources and avoid secondary contamination. A novel nonionic surfactant of C6‐DIB‐PEG has been constructed by using a dynamic imine bond (DIB) as the linker between hexyl amine (C6‐NH2) and an aromatic aldehyde modified polyethylene glycol (PEG‐CHO). The results presented in this study reveal that an oil‐in‐water emulsion of tetradecane‐H2O stabilized by C6‐DIB‐PEG is pH‐switched. Upon reaction with HCl, C6‐DIB‐PEG readily converts to its inactive forms C6‐NH3+Cl− and PEG‐CHO when the pH is changed from 12.0 to 4.0, resulting in a complete tetradecane‐water two‐phase separation. Both C6‐NH3+Cl− and PEG‐CHO are insoluble in tetradecane but soluble in water, allowing subsequent retrieval of nearly surfactant‐free tetradecane. Recovery of C6‐DIB‐PEG was enabled by treating aqueous solutions of C6‐NH3+Cl− and PEG‐CHO with NaOH after pH was increased from 4.0 to 12.0. The pH‐switched C6‐DIB‐PEG renders a potential use for oil retrieval and surfactant recovery in the postprocessing of eluted emulsions, as demonstrated by the C6‐DIB‐PEG‐enhanced washing of tetradecane‐contaminated sand. Around 95.2% of the tetradecane and about 99.7% of the C6‐DIB‐PEG were retrieved and recycled over 10 cycles of washing. In addition, the total organic carbon (TOC) of the residual wastewater was remarkably reduced from around 7065.3 to ~54.1 mg L−1 after NaHSO3 treatment followed by ion‐exchange resin and active carbon adsorption.

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Remediation of soils polluted with lindane using surfactant-aided soil washing and electrochemical oxidation

Cited by 73 publications

References 44 publications

Anodic oxidation for the remediation of soils polluted with perchloroethylene

Anodic oxidation for the remediation of soils polluted with perchloroethylene

Environmental Applications of Boron‐Doped Diamond Electrodes: 2. Soil Remediation and Sensing Applications

Recyclable dynamic imine‐based nonionic surfactants and potential use in postprocessing of eluted emulsions

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