A Semi Passive Nutrient Injection System for In Situ Bioremediationby J. F. Devlin, Univ of Waterloo, Waterloo, Canada,
J. F. Barker, Univ of Waterloo, Waterloo, Canada,
Abstract: A permeable cutoff wall is installed across the path of a contaminant plume. The water in the wall can be amended with the desired nutrient solution using pumping and injecting wells within the wall. After addition of the nutrients, the pulse is permitted to drift out of the wall under natural gradient conditions, spreading longitudinally as it goes. If this pulsing cycle is repeated at intervals of weeks to months, under suitable hydrogeologic conditions, a stable microbial population can be continually stimulated and supported at some distance downgradient from the wall. A field experiment is in progress at CFB Borden, Ontario, Canada. Tracer studies indicate that significant mixing of successive pulses injected at 5 week intervals occurs within 5 metres of the wall. Changing redox conditions within the aquifer indicate that biostimulation is being achieved.
Subject Headings: Nutrients | Core walls | Remediation | Field tests | Water treatment | Aquifers | Microbes | Plumes | Wells (water) | North America | Canada | Ontario
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