Experimental study of transport and capture of colloids in porous media
Conference
·
OSTI ID:126355
- Laboratorie des Sciences du Genie Chimique, Nancy (France)
In the field of radioactive wastes storage, it is well known that radioactive substances can be transported in the geosphere by colloids. The mechanisms which control the interactions between radionuclide and colloid and the transport and capture of colloids are therefore studied in artificial and in natural porous media. Liquid chromatography methods are used to carry out impulse and step injections of latex suspensions in glass beads and sand columns. The physico-chemical and hydrodynamic conditions are changed to determine the effects of parameters as liquid flow rate, ionic strength, and pH on the retention of colloids. The main result is that conditions of low flow rate and high ionic strength can induce a delayed breakthrough of colloids in the medium. The definition of two types of capture sites is proposed from the good simulation of experimental curves with a linear mixing-cell-in-series model.
- OSTI ID:
- 126355
- Report Number(s):
- CONF-950402--
- Country of Publication:
- United States
- Language:
- English
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