RT Journal Article
T1 Treatment of a complex emulsion of a surfactant with chlorinated organic compounds from lindane wastes under alkaline conditions by air stripping
A1 Sáez González, Patricia
A1 García Cervilla, Raúl
A1 Santos López, Aurora
A1 Romero Salvador, Arturo
A1 Lorenzo Fernández, David
AB Surfactant-enhanced aquifer remediation is commonly applied in polluted sites with dense non-aqueous phase liquids(DNAPLs). This technique transfers the contamination from subsoil to an extracted emulsion, which requires further treatment.This work investigated the treatment of a complex emulsion composed of a nonionic surfactant and real DNAPL formed ofchlorinated organic compounds (COCs) and generated as a lindane production waste by air stripping under alkaline conditions. Theinfluence of the surfactant (1.5−15 g·L−1), COC concentrations (2.3−46.9 mmol·L−1), and temperature (30−60 °C) on the COCvolatilization was studied and modeled in terms of an apparent constant of Henry at pH > 12. In addition, the surfactant stability wasstudied as a function of temperature (20−60 °C) and surfactant (2−10 g·L−1), COC (0−70.3 mmol·L−1), and NaOH (0−4 g·L−1)concentrations. A kinetic model was successfully proposed to explain the loss of surfactant capacity (SCL). The results showed thatalkali and temperature caused the SCL by hydrolysis of the surfactant molecule. The increasing surfactant concentration decreasedthe COC volatility, whereas the temperature improved the COC volatilization. Finally, the volatilization of COCs in alkalineemulsions by air stripping (3 L·h−1) was performed to evaluate the treatment of an emulsion composed of the COCs (17.6 mmol·kg−1) and surfactant (3.5 and 7 g·L−1). The air stripping was successfully applied to remove COCs (>90%), reaching an SCL of 80%at 60 °C after 8 h. Volatilization can remove COCs from emulsions and break them, enhancing their further disposal.
PB ACS
SN 0888-5885
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/107901
UL https://hdl.handle.net/20.500.14352/107901
LA eng
NO Ind. Eng. Chem. Res. 2023, 62, 3282−3293
DS Docta Complutense
RD 5 abr 2025