Remediation of groundwater contaminated with DNAPLs by biodegradable oil emulsion.
Emulsion-based remediation with biodegradable vegetable oils was investigated as an alternative technology for the treatment of subsurface DNAPLs (dense non-aqueous phase liquids) such as TCE (trichloroethylene) and PCE (perchloroethylene). Corn and olive oil emulsions obtained by homogenization at 8000rpm for 15min were used. The emulsion droplets prepared with corn and olive oil gave a similar size distribution (1-10microm) and almost all of initially injected oil, >90%, remained in a dispersed state. In batch experiments, 2% (v/v) oil emulsion could adsorb up to 11,000ppm of TCE or 18,000ppm of PCE without creating a free phase. Results of one-dimensional column flushing studies indicated that contaminants with high aqueous solubility could be efficiently removed by flushing with vegetable oil emulsions. Removal efficiencies exceeded 98% for TCE and PCE with both corn and olive oil emulsions. The results of this study show that flushing with biodegradable oil emulsion can be used for the remediation of groundwater contaminated by DNAPLs.
Lee
Young-Chul
YC
Environmental Remediation Engineering Laboratory, Department of Chemical & Biomolecular Engineering, KAIST, 373-1, Guseong-dong, Yuseong-gu, Daejeon 305-701, Republic of Korea.
Kwon
Tae-Soon
TS
Yang
Jung-Seok
JS
Yang
Ji-Won
JW
D001673:Biodegradation, Environmental; D004655:Emulsions; D052918:Environmental Restoration and Remediation / Q000379:methods*; D009930:Organic Chemicals; D010938:Plant Oils; D012997:Solvents; D014873:Water Pollutants; D014876:Water Pollution
D004655:Emulsions; D009930:Organic Chemicals; D010938:Plant Oils; D012997:Solvents; D014873:Water Pollutants