OS Remediation Invites You To A Webinar: Fate of Vinyl Chloride in Aquifers: Organisms, Pathways, and Monitoring Tools
Wednesday, September 23, 2015 12:00 PM - 1:00 PM EDT
As a proven human carcinogen, vinyl chloride (VC) is a major risk factor in many contaminated aquifers. Lingering concentrations above the maximum concentration level (MCL) of 2 ppb generally prevent site closures, thus requiring continued remedial and monitoring efforts. Knowledge of the pathways and mechanisms that contribute to VC detoxification is essential to predict the fate and longevity of VC in groundwater plumes.
VC can be degraded by microbes under oxic and anoxic conditions and is also susceptible to abiotic transformation. Under anoxic conditions, reductive dechlorination catalyzed by organohalide-respiring Chloroflexi (e.g., Dehalococcoides mccartyi) bacteria carrying specific reductive dehalogenase genes can lead to the formation of environmentally benign ethene. In plumes with bioavailable oxygen, ubiquitous bacteria can use VC as a carbon and energy source resulting in VC mineralization. VC can also undergo co-metabolic transformation and methanotrophic activity, for example, can lead to VC detoxification under oxic conditions in the presence of a suitable primary substrate (e.g., methane). Further, reactive mineral phases such as iron sulfides and possibly magnetite may contribute to VC detoxification. To assess and predict the contributions of the above-mentioned processes to VC detoxification, process-tailored monitoring tools are a requisite. Recent efforts have expanded the molecular tools box, and specific qPCR assays to determine the presence and abundance of microbes of interest are available. This presentation will summarize known processes and monitoring tools applicable to VC-impacted sites, and will also identify research needs to enhance remedial strategies and predict VC degradation rates and longevity.
Register today to take advantage of this important educational opportunity. Contact us after the webinar to receive 1.0 PDH for your participation.