Electrocoagulation of the effluents from surfactant-aided soil-remediation processes

Abstract

The work described here concerns the electrochemical coagulation of effluents obtained in a surfactant-aided soil-remediation processes, in which phenanthrene was extracted from a clay soil using a sodium dodecyl sulphate solution as the solubilising fluid. The results show that the efficiency of the processes is largely influenced by the electrode materials employed in the electrocoagulation process and also by the initial pH of the treated effluents. Different cases have been studied, including synthetic effluents from soil-washing and electrokinetic soil-flushing. This technique is particularly effective in the treatment of the strongly acidic effluents arising from electrokinetic surfactant-aided soil-flushing of polluted soils using aluminium electrodes (anodes and cathodes). Under these conditions, in addition to a high level of pollution removal, this technology provides a significant reduction in the conductivity and partial neutralization of the effluent.

Coupling of Anodic Oxidation and Soil Remediation Processes: A Review

“…Several flushing fluids have been used with or without additives to mobilize pollutants in contaminated soils. Among them, the fluids that are capable of soil pH regulation are more beneficial because they can compensate for the influence of the acidic or alkaline fronts created in the soil during electrokinetic remediation [ 12 , 75 , 76 ]. These fluids can be use alone or along with surfactants such as Tween 80, SDS, β-CD, and others for the soil flushing.…”

Pollutant Diseases, Remediation and Recycling

“…This technique is also effective in the treatment of the strongly acidic effl uents arising from electrokinetic surfactant-aided soil-fl ushing of polluted soils using aluminium electrodes (anodes and cathodes) (Lopez-Vizcaino et al 2012 ).…”

Remediation of PAH-Contaminated Soil by Combining Surfactant Enhanced Soil Washing and Iron-Activated Persulfate Oxidation Process

“…However, soil-washing effluents contain a complex mixture of dissolved PAHs and surfactants, which can bring about secondary pollution to the environment if discharged without proper treatment. The methods for the treatment of soil washing wastewater include advanced oxidation process [10], bio-treatment processes [11], electrochemical oxidation [12], photocatalytic processes, and the combination of some of the techniques [8,13].…”