Controlling Methane ar ERD and ISCR Applications


In situ chemical reduction (ISCR) and enhanced reductive dehalogenation (ERD) have demonstrated success in the remediation of numerous recalcitrant and toxic compounds, including chlorinated ethenes and hexavalent chromium.  ISCR describes the combined effect of stimulated biological oxygen consumption (via fermentation of an organic carbon source), direct chemical reduction with zero-valent iron (ZVI) or other reduced metals. As described by Brown et. al. (2009), the corresponding enhanced thermodynamic decomposition reactions that are realized at the lowered redox (Eh) conditions allow for more effective mineralization of many constituents of interest (COIs).   A growing number of ERD substrates and other accelerated anaerobic bioremediation technologies (e.g., emulsified oils, non-emulsified oils, carbon-based hydrogen release compounds, vegetable matter + ZVI amendments, etc.) are available that facilitate the anaerobic biodegradation of halogenated compounds.  Many readers will know from their own experiences that these amendments have been widely used with varying degrees of success in terms of overall remedial performance. One seemingly universal phenomenon has been the biological production of methane, especially during the early phases of remedial actions (look for it and you will find it). Active measures to control the production of methane can offer multiple advantages in terms of cost, treatment efficiency, and safety.

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