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TZUNTIL:20191027T010000Z
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DTSTART:20161030T030000
TZOFFSETFROM:+0200
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RDATE:20171029T030000
RDATE:20181028T030000
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UID:www.bayceer.uni-bayreuth.de-bayceer-t140253id
DTSTAMP:20260519T044209Z
DESCRIPTION:Application of nano and micro-scale particles has emerged as a 
 promising in situ remediation technology for the remediation of contaminat
 ed groundwater\, particularly for areas difficult to access by other remed
 iation techniques. The performance of nanoparticle injections\, as a forem
 ost step within this technology\, is usually assessed through the geochemi
 cal analysis of soil and groundwater samples. This approach is not well su
 ited for a real-time monitoring\, and often suffers from a poor spatio-tem
 poral resolution and only provides information from areas close to the sam
 pling points. The talk will present an alternative method to overcome such
  limitations based on the application of non-invasive Induced Polarization
  (IP) imaging\, a geophysical method that provides information on the elec
 trical properties of the subsurface.\nThe analysis of spatial and temporal
  changes in the electrical images allows tracking the propagation of the i
 njected particles as well as to detect the induced bio-geochemical changes
  in the subsurface. Here\, we present IP monitoring results for data colle
 cted at two different experiments: (i) during the injection of Nano-Goethi
 te particles (NGP) used for simulation of biodegradation of a BTEX plume (
 i.e.\, benzene\, toluene\, ethylbenzene\, and xylene)\; and  (ii) during t
 he injection of microscale zero-valent iron (mZVI) to enhance chemical tra
 nsformation of an aquifer impacted by chlorinated aliphatic hydrocarbons (
 CAHs). Pre-injection imaging results revealed high electrical conductiviti
 es\; which might appear as contradictory observations considering that hyd
 rocarbons are poor electrical conductor. Nevertheless\, such response can 
 be explained by the release of metabolic by-products accompanying the stim
 ulation of microbial activity due to the presence of hydrocarbons in the s
 ubsurface. Moreover\, background images of the induced polarization (IP) r
 eveal contrasting signatures for the different pollutants. Such changes ca
 n be explained by variations in the pore-space geometry which are characte
 ristic to given geochemical properties of the pollutants. Post-injection i
 mages revealed a significant change in (> 50%) the electrical conductivity
  and induced polarization images\, with even larger changes in the proximi
 ty of the injection points. Temporal changes in the electrical images are 
 consistent with variations in particles concentration reported in groundwa
 ter and soil samples\, as well as geochemical parameters such as pH and ox
 idation-reduction potential. Our results demonstrate the applicability of 
 IP imaging for the real-time monitoring of nano- and micro-scale particle 
 injection\, as well as of the accompanying geochemical changes.\n \n*** in
 vited by Sven Frei\, Hydrology
DTSTART;TZID=Europe/Berlin:20171026T120000
DTEND;TZID=Europe/Berlin:20171026T133000
LOCATION:S 135\, NW III
SUMMARY:Dr. Adrian Flores-Orozco\, Research Group Geophysics\, Department o
 f Geodesy and Geoinformation\, TU Wien (Homepage): Electrical imaging of s
 ubsurface nano- and micro-scale particle injections for in situ groundwate
 r remediation
TRANSP:TRANSPARENT
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