Non-Ionic Surfactant Recovery in Surfactant Enhancement Aquifer Remediation Effluent with Chlorobenzenes by Semivolatile Chlorinated Organic Compounds Volatilization

Patricia Sáez, Aurora Santos, Raúl García-Cervilla, Arturo Romero and David Lorenzo
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Patricia Sáez: Chemical Engineering and Materials Department, Complutense University of Madrid, 28040 Madrid, Spain
Aurora Santos: Chemical Engineering and Materials Department, Complutense University of Madrid, 28040 Madrid, Spain
Raúl García-Cervilla: Chemical Engineering and Materials Department, Complutense University of Madrid, 28040 Madrid, Spain
Arturo Romero: Chemical Engineering and Materials Department, Complutense University of Madrid, 28040 Madrid, Spain
David Lorenzo: Chemical Engineering and Materials Department, Complutense University of Madrid, 28040 Madrid, Spain

IJERPH, 2022, vol. 19, issue 12, 1-12

Abstract: Surfactant enhanced aquifer remediation is a common treatment to remediate polluted sites with the inconvenience that the effluent generated must be treated. In this work, a complex mixture of chlorobenzene and dichlorobenzenes in a non-ionic surfactant emulsion has been carried out by volatilization. Since this techhnique is strongly affected by the presence of the surfactant, modifying the vapour pressure, P v 0 , and activity coefficient, γ , a correlation between P v j 0 γ j and surfactant concentration and temperature was proposed for each compound, employing the Surface Response Methodology (RSM). Volatilization experiments were carried out at different temperatures and gas flow rates. A good agreement between experimental and predicted remaining SVCOCs during the air stripping process was obtained, validating the thermodynamic parameters obtained with RSM. Regarding the results of volatilization, at 60 °C 80% of SVCOCs were removed after 6 h, and the surfactant capacity was almost completely recovered so the solution can be recycled in soil flushing.

Keywords: surfactant; chlorinated organic compounds; volatilization; emulsion treatment; SEAR emulsion treatment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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