TY - JOUR
T1 - Surfactant recycling by solvent extraction in surfactant-aided remediation
AU - Lee, Dal Heui
AU - Cody, Robert D.
AU - Kim, Dong Ju
N1 - Funding Information:
We are grateful for support of this research from Iowa Academy Sciences. We would like to express our appreciation to Dr Alan A. DiSpirito of the Department of Microbiology at Iowa State University for sample analysis and invaluable comments. Special thanks are extended to the members of organic chemistry laboratory of the Department of Chemistry at Iowa State University.
PY - 2002/4/1
Y1 - 2002/4/1
N2 - As a part of the study on the surfactant-aided remediation of organic contaminants, solvent extraction was investigated to determine its efficiency for used surfactant recycling. The experiments used a glass column 70 cm height with an internal diameter of 3 cm. The convex orifice with four holes (4 mm outer diameter) was installed at the base of the column. Four percent aqueous surfactant solutions solubilizing toluene or 1,2,4-trichlorobenzene (TCB) as model contaminants were injected in the column. Acetone, hexane, and methylene chloride were used as the solvent, and the solvent was allowed to flow upward through the surfactant solution in the column and circulated by a pump. Toluene and 1,2,4-TCB were effectively removed from the aqueous solution of anionic surfactant diphenyl oxide disulfonate (DOSL, trade name Dowfax 8390) using hexane and methylene chloride as the solvent. The times required for 98% removal of the toluene and 1,2,4-TCB were 5 h with methylene chloride or hexane flow rates of 30 ml/min. This indicates that the present solvent extraction method may help recycle anionic surfactant solutions used for remediation of contaminated soil.
AB - As a part of the study on the surfactant-aided remediation of organic contaminants, solvent extraction was investigated to determine its efficiency for used surfactant recycling. The experiments used a glass column 70 cm height with an internal diameter of 3 cm. The convex orifice with four holes (4 mm outer diameter) was installed at the base of the column. Four percent aqueous surfactant solutions solubilizing toluene or 1,2,4-trichlorobenzene (TCB) as model contaminants were injected in the column. Acetone, hexane, and methylene chloride were used as the solvent, and the solvent was allowed to flow upward through the surfactant solution in the column and circulated by a pump. Toluene and 1,2,4-TCB were effectively removed from the aqueous solution of anionic surfactant diphenyl oxide disulfonate (DOSL, trade name Dowfax 8390) using hexane and methylene chloride as the solvent. The times required for 98% removal of the toluene and 1,2,4-TCB were 5 h with methylene chloride or hexane flow rates of 30 ml/min. This indicates that the present solvent extraction method may help recycle anionic surfactant solutions used for remediation of contaminated soil.
KW - Extraction
KW - Recycling
KW - Remediation
KW - Solvent
KW - Surfactant
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U2 - 10.1016/S1383-5866(01)00159-9
DO - 10.1016/S1383-5866(01)00159-9
M3 - Article
AN - SCOPUS:0036539524
VL - 27
SP - 77
EP - 82
JO - Separation and Purification Technology
JF - Separation and Purification Technology
SN - 1383-5866
IS - 1
ER -