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Surfactant   enhanced   remediation   is   viewed   as   a   potential   method   for   removing organometallic  compounds  from  contaminated  aquifers.  Dibutyltin  dichloride  (DBT),  as  a representative organometallic compound, was applied in sand packed columns to observe its solubilization  behavior  compared  to  that  of  perchloroetylene  (PCE),  a  normal  organic solvent. Ottawa sand was used as the porous media. A mixture of DBT and PCE was applied as the contaminant. The  tracer study  exhibited the plug flow  condition with a retention time of  79.9  min.  The  surfactant  solution  was  a  mixture  of  3.6  wt%  SDHS  and  0.4  wt% C16DPDS with various concentrations of CaCl2.The column experiments were carried out by single and gradient surfactant systems. The effluent exhibited a general solubilization pattern for PCE, governed by a rate limiting mechanism. However, the concentration of DBT in the effluent  observed  in  every  experiment  was  just  a  slice  of  its  solubilization  capacity.The adsorption  of  DBT  on  the  sand  was  suspected  to  be  the  cause  of  the  problem.  The solubilization   of   DBT   by   a   surfactant   was   ineffective   at   removing   DBT   from   the contaminated media. It may be concluded that DBT exhibits the properties of both an organic and  inorganic  compound;  it  could  be  solubilized  by  a  surfactant  and  absorbed  strongly  on sand. Nevertheless, the  results indicate that trapped DBT  could be removed by mobilization in the form of a PCE-DBT mixture and that adsorption could be prevented by a very low pH condition.

Perchloroetylene and Dibutyltin Dichloride Removal from Packed Column by Surfactant Solution