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- W2014911510 abstract "Sustained treatment is an emerging concept used to describe enhancements in attenuation capacity after the conclusion of the active treatment period for a given source-depletion technology. The term includes mechanisms that lead to contaminant transformation or destruction over extended periods of time, such as endogenous biomass decay, slow diffusion of remedial amendments from low-permeability zones, and the formation of reactive mineral species. This “value-added” treatment continues after the end of capital expenditures at a site, and it provides additional insight in determining if monitored natural attenuation is a viable long-term option for a site. This article identifies several sustained treatment mechanisms, examines technology-specific factors that contribute to sustained treatment, and explores the potential timescales of sustained treatment relative to active treatment. As demonstrated in post-treatment site data obtained during a comprehensive source-depletion technology performance survey, enhanced bioremediation is the most promising in promoting sustained treatment, and this beneficial effect can extend for several years due to factors such as slow biomass decay. There is little evidence that other commonly used technologies (thermal treatment, in situ chemical oxidation, surfactant-enhanced remediation, or cosolvent flushing) result in any significant sustained treatment. An exception would be a cosolvent flushing project where large quantities of biodegradable cosolvent are left in the subsurface at the end of the project, which could result in sustained long-term dechlorination activity. In the case of in situ chemical oxidation, factors that contribute to a higher incidence of concentration rebound mask any potential sustained treatment effects. © 2011 Wiley Periodicals, Inc." @default.
- W2014911510 created "2016-06-24" @default.
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- W2014911510 date "2011-03-01" @default.
- W2014911510 modified "2023-10-18" @default.
- W2014911510 title "Sustained treatment: Implications for treatment timescales associated with source-depletion technologies" @default.
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- W2014911510 doi "https://doi.org/10.1002/rem.20280" @default.
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