Document Detail

Impact of in situ chemical oxidation on contaminant mass discharge: linking source-zone and plume-scale characterizations of remediation performance.
MedLine Citation:
PMID:  21615133     Owner:  NLM     Status:  MEDLINE    
A large-scale permanganate-based in situ chemical oxidation (ISCO) effort has been conducted over the past ten years at a federal Superfund site in Tucson, AZ, for which trichloroethene (TCE) is the primary contaminant of concern. Remediation performance was assessed by examining the impact of treatment on contaminant mass discharge, an approach that has been used for only a very few prior ISCO projects. Contaminant mass discharge tests were conducted before and after permanganate injection to measure the impact at the source-zone scale. The results indicate that ISCO caused a significant reduction in mass discharge (approximately 75%). The standard approach of characterizing discharge at the source-zone scale was supplemented with additional characterization at the plume scale, which was evaluated by examining the change in contaminant mass discharge associated with the pump-and-treat system. The integrated contaminant mass discharge decreased by approximately 70%, consistent with the source-zone-scale measurements. The integrated mass discharge rebounded from 0.1 to 0.2 kg/d within one year after cessation of permanganate injections, after which it has been stable for several years. Collection of the integrated contaminant mass discharge data throughout the ISCO treatment period provided a high-resolution, real-time analysis of the site-wide impact of ISCO, thereby linking source-zone remediation to impacts on overall risk. The results indicate that ISCO was successful in reducing contaminant mass discharge at this site, which comprises a highly heterogeneous subsurface environment. Analysis of TCE sediment concentration data for core material collected before and after ISCO supports the hypothesis that the remaining mass discharge is associated in part with poorly accessible contaminant mass residing within lower-permeability zones.
M L Brusseau; K C Carroll; T Allen; J Baker; W Diguiseppi; J Hatton; C Morrison; A Russo; J Berkompas
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2011-05-26
Journal Detail:
Title:  Environmental science & technology     Volume:  45     ISSN:  1520-5851     ISO Abbreviation:  Environ. Sci. Technol.     Publication Date:  2011 Jun 
Date Detail:
Created Date:  2011-06-13     Completed Date:  2011-09-30     Revised Date:  2013-06-28    
Medline Journal Info:
Nlm Unique ID:  0213155     Medline TA:  Environ Sci Technol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  5352-8     Citation Subset:  IM    
School of Earth and Environmental Sciences, University of Arizona, Tucson, Arizona, USA.
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MeSH Terms
Environmental Remediation / methods*
Geologic Sediments / chemistry
Manganese / analysis
Molecular Weight
Soil / chemistry
Trichloroethylene / analysis
Water Pollutants, Chemical / analysis*
Water Supply / analysis
Grant Support
ES04940/ES/NIEHS NIH HHS; P42 ES004940-21/ES/NIEHS NIH HHS; P42 ES004940-22/ES/NIEHS NIH HHS; P42 ES004940-23/ES/NIEHS NIH HHS
Reg. No./Substance:
0/Soil; 0/Water Pollutants, Chemical; 7439-96-5/Manganese; 79-01-6/Trichloroethylene

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