Removal of chlorinated hydrocarbons from water by air stripping and solvent sublation

Removal of trichloroethylene, monochlorobenzene and 1,3 dichlorobenzene from water by air stripping and solvent sublation into an organic phase was investigated. The sublation solvents used were paraffin oil and decyl alcohol. The rate of removal from water by solvent sublation and air stripping was highest for trichloroethylene, followed by chlorobenzene and finally 1,3 dichlorobenzene. For the three compounds, solvent sublation had the greatest advantage over air stripping in the reduction of emission of the compounds to the atmosphere. For the three compounds, the removal was enhanced at higher flowrate in both air stripping and solvent sublation. For the removal of monochlorobenzene and 1,3 dichlorobenzene from water, solvent sublation showed a marked improvement over air stripping at air flowrates of 60 ml/min and 94 ml/min. Solvent sublation did not show any significant improvement in the removal of trichloroethylene from water over air stripping. Solvent sublation was found to be relatively independent of the thickness of the organic solvent floated on top of the aqueous solution. Solvent sublation for the removal of monochlorobenzene, and 1,3 dichlorobenzene from water gave better results with decyl alcohol than with mineral oil. Addition of emulsions to water decreased the rate of removal of rnonochlorobenzene and 1,3 dichlorobenzene from the aqueous phase