Field-Scale Correlations between Degradation Rates, TOC and Biogeochemistry in ERD

摘要

Enhanced reductive dechlorination (ERD) of chlorinated volatile organic carbon compounds (CVOCs) has been implemented with numerous organic carbon electron donors including: carbohydrates, alcohols, fatty acids, oils and emulsions, and natural organic material (i.e. peat, mulch). Regardless of remedial substrate, ERD activities are designed to provide a continuous source of organic carbon to sustain treatment and minimize longterm cost. To predict treatment costs, remedial timeframes can be estimated using reported constituent-specific half lives, contaminant retardation coefficients, and groundwater velocity to obtain first-order contaminant decay rates. Standardized modeling methods (e.g. BIOCHLOR) exist that can be used to estimate treatment and attenuation periods, but these predicted durations can vary significantly based on field geochemical conditions and remedial design (i.e. substrate selection, well spacing, injection volume).