Remediating pesticide contaminated soils using solvent extraction
Abstract
Bench-scale solvent extraction studies were performed on soil samples obtained from a Superfund site contaminated with high levels of p,p{prime}-DDT, p,p{prime}-DDE and toxaphene. The effectiveness of the solvent extraction process was assessed using methanol and 2-propanol as solvents over a wide range of operating conditions. It was demonstrated that a six-stage methanol extraction using a solvent-to-soil ratio of 1.6 can decrease pesticide levels in the soil by more than 99% and reduce the volume of material requiring further treatment by 25 times or more. The high solubility of the pesticides in methanol resulted in rapid extraction rates, with the system reaching quasi-equilibrium state in 30 minutes. The extraction efficiency was influenced by the number of extraction stages, the solvent-to-soil ratio, and the soil moisture content. Various methods were investigated to regenerate and recycle the solvent. Evaporation and solvent stripping are low cost and reliable methods for removing high pesticide concentrations from the solvent. For low concentrations, GAC adsorption may be used. Precipitating and filtering pesticides by adding water to the methanol/pesticide solution was not successful when tested with soil extracts. 26 refs., 10 figs., 6 tabs.
- Authors:
-
- National Management Research Lab., Cincinnati, OH (United States)
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 530602
- Resource Type:
- Journal Article
- Journal Name:
- Environmental Progress
- Additional Journal Information:
- Journal Volume: 15; Journal Issue: 4; Other Information: PBD: Win 1996
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES; SOILS; REMEDIAL ACTION; PESTICIDES; SOLVENT EXTRACTION; DDT; ADSORPTION; COST; EVAPORATION; METHANOL
Citation Formats
Sahle-Demessie, E, Meckes, M C, and Richardson, T L. Remediating pesticide contaminated soils using solvent extraction. United States: N. p., 1996.
Web. doi:10.1002/ep.670150420.
Sahle-Demessie, E, Meckes, M C, & Richardson, T L. Remediating pesticide contaminated soils using solvent extraction. United States. https://doi.org/10.1002/ep.670150420
Sahle-Demessie, E, Meckes, M C, and Richardson, T L. 1996.
"Remediating pesticide contaminated soils using solvent extraction". United States. https://doi.org/10.1002/ep.670150420.
@article{osti_530602,
title = {Remediating pesticide contaminated soils using solvent extraction},
author = {Sahle-Demessie, E and Meckes, M C and Richardson, T L},
abstractNote = {Bench-scale solvent extraction studies were performed on soil samples obtained from a Superfund site contaminated with high levels of p,p{prime}-DDT, p,p{prime}-DDE and toxaphene. The effectiveness of the solvent extraction process was assessed using methanol and 2-propanol as solvents over a wide range of operating conditions. It was demonstrated that a six-stage methanol extraction using a solvent-to-soil ratio of 1.6 can decrease pesticide levels in the soil by more than 99% and reduce the volume of material requiring further treatment by 25 times or more. The high solubility of the pesticides in methanol resulted in rapid extraction rates, with the system reaching quasi-equilibrium state in 30 minutes. The extraction efficiency was influenced by the number of extraction stages, the solvent-to-soil ratio, and the soil moisture content. Various methods were investigated to regenerate and recycle the solvent. Evaporation and solvent stripping are low cost and reliable methods for removing high pesticide concentrations from the solvent. For low concentrations, GAC adsorption may be used. Precipitating and filtering pesticides by adding water to the methanol/pesticide solution was not successful when tested with soil extracts. 26 refs., 10 figs., 6 tabs.},
doi = {10.1002/ep.670150420},
url = {https://www.osti.gov/biblio/530602},
journal = {Environmental Progress},
number = 4,
volume = 15,
place = {United States},
year = {Tue Dec 31 00:00:00 EST 1996},
month = {Tue Dec 31 00:00:00 EST 1996}
}