Horizontal insulating barriers as a way to protect groundwater
2018
Abstract. Trenchless Technology of Forming Horizontal Insulating Barriers
(TFHB) can be considered a method of groundwater protection against inflow of
pollutants. In TFHB technology, the working fluid (sodium silicate solution)
and the gelling agent (CO 2 ) are injected separately, using one tool, to
different zones of the aquifer profile. Carbon dioxide injected into the
saturation zone rises due to buoyancy forces and reaches the silicate which
was injected at the water table level. This initiates the process of silicate
gelation, resulting in the formation of an insulating barrier. For
technological purposes, the gelation time must be controlled, and the
resulting gel must have certain mechanical properties. In order to apply THFB
in real conditions it was necessary to identify important technological and
technical parameters, as well as to define interactions between the injected
fluid and the aquifer rocks. Geochemical modelling (equilibrium, reaction
path and reactive transport) was used to identify potential geochemical
effects of the application of TFHB in sandy aquifers. Certain petrophysical
parameters and mineralogical assemblages of aquifers were addressed, taking
into account both low and strongly mineralized groundwater. The simulations
revealed that TFHB does not have a negative impact on the chemistry of
rock-water systems described in this work.
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