Investigating the potential for long-term permeable reactive barrier (PRB) monitoring from the electrical signatures associated with the reduction in reactive iron performance

Slater, Lee ; Choi, Jaeyoung

Rutgers University, Newark, NJ (United States)

关键词: Precipitation;    Oxidation;    Monitoring;    Electron Exchange;    Sensitivity;   

DOI  :  10.2172/838629
RP-ID  :  EMSP-88615--2003
RP-ID  :  FG07-02ER63506
RP-ID  :  838629

美国|英语

来源: UNT Digital Library

【 摘 要 】

The ultimate objective of this project is to quantify the ability of the electrical induced polarization (IP) method to non-invasively monitor the reduction in reactive iron performance that is known to reduce the effectiveness of the permeable reactive barrier (PRB) with time. The primary scientific goals include: (1) fundamental laboratory studies to evaluate the sensitivity of the IP method to physical/chemical changes to the iron surface resulting from oxidation, precipitation and clogging (2) monitoring of the electrical tomographic response of an installed PRB over a three-year period and assessment, via correlation with aqueous geochemical data and extracted iron cores, of whether electrical signatures associated with reduced PRB performance are resolvable in field studies (3) optimization of a three-dimensional tomographic imaging algorithm for application to highly conductive, high electrical contrast environments as represented by a PRB IP theory and empirical data resulting from the original development of the method for mineral exploration suggests that the method is highly relevant in the study of reactive iron barriers. Laboratory and field IP studies on mineral deposits illustrate the sensitivity of IP parameters to metal concentration, particle size and metal surface chemistry. IP theory, based on electrical (Warburg) impedance associated with diffusive ion transfer to/from the electrolyte to electron exchange sites on the metal surface, provides a framework for interpreting IP signatures of PRBs as a function of redox chemistry.