Enhanced transport of Si-coated nanoscale zero-valent iron particles in porous media.

Laboratory column experiments were conducted to evaluate the effect of previously described silica coating method on the transport of nanoscale zero-valent iron (nZVI) in porous media. The silica coating method showed the potential to prevent the agglomeration of nZVI. Transport experiments were conducted using laboratory-scale sand-packed columns at conditions that were very similar of natural groundwater.

Enhanced colloidal stability of nanoscale zero valent iron particles in the presence of sodium silicate water glass.

A method for the stabilization of nanoscale zero valent iron (nZVI) particles using silica was developed. Stabilization can significantly improve the performance characteristics of currently available nZVI products containing agglomerated particles. In the first step of the method, the agglomerates were broken using a sonication.

Soil flushing by surfactant solution: pilot-scale demonstration of complete technology.

This paper mainly relates to the real polychlorinated biphenyl (PCB)-contaminated soil flushing process, in which an aqueous solution of anionic surfactant was passed through sandy soil having an average concentration 34.3 mg/kg of dry matter. The goal of the treatment was to decrease the PCB concentration in the soil to less than 10 mg/kg, which is a limiting value if the soil is to be used in the field of civil engineering.

Comparison of electrodialytic removal of Cu from spiked kaolinite, spiked soil and industrially polluted soil.

Electrokinetic remediation methods for removal of heavy metals from polluted soils have been subjected for quite intense research during the past years since these methods are well suitable for fine-grained soils where other remediation methods fail. Electrodialytic remediation is an electrokinetic remediation method which is based on applying an electric dc field and the use of ion exchange membranes that ensures the main transport of heavy metals to be out of the pollutes soil. An experimental investigation was made with electrodialytic removal of Cu from spiked kaolinite, spiked soil and industrially polluted soil under the same operational conditions (constant current density 0.