Design Guidance for Application of Permeable Reactive Barriers for Groundwater Remediation

Abstract

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Technologie wykonania przepuszczalnych barier reaktywnych

“…Drugą funkcją jest zapewnienie optymalnych warunków przepływu zanieczyszczeń przez strefę oczyszczania, nie dopuszczając do ich "opływania" (poniżej lub powyżej strefy). Analiza wyników szczegółowych badań terenowych, laboratoryjnych i numerycznych umożliwia instalację PBR w zanieczyszczonym podłożu tak, aby zapewnić właściwe oczyszczenie środowiska gruntowo-wodnego (Gavaskar i in., 2000;Malina, 2007;Fronczyk, 2008).…”

Electrical Imaging of Permeable Reactive Barrier (PRB) Integrity

“…This PRB was designed to remediate 1,2-dichloroethylene (1,2-DCE) and vinyl chloride (VC). PRB barrier design typically considers the hydraulic properties of the medium, regional hydraulic gradients, contaminant concentrations and iron-hydrocarbon reaction times (Gavaskar et al, 1998). Alluvial sediments underlie the site, primarily silty clay overlying basal gravel.…”

“…A PRB is typically constructed of granular (zero valent) iron and strategically placed to capture hydrocarbon contaminated groundwater flow. As contaminated groundwater flows through the barrier, chlorinated organics come in contact with the reactive medium and are degraded into potentially nontoxic dehalogenated organic compounds and inorganic chloride (Gavaskar et al, 1998). The initial and long term performance of currently installed PRB's is uncertain.…”

“…The initial and long term performance of currently installed PRB's is uncertain. Gavaskar et al (1998) highlight two key aspects of PRB evaluation that need immediate attention: methods for non-invasive assessment of (1) PRB integrity following installation, and (2) long-term barrier degradation and performance.…”

“…Longterm monitoring strategies are required to record the deterioration in barrier performance that occurs as reactive iron is oxidized during hydrocarbon degradation. Gavaskar et al (1998) note that the life cycle of the PRBs currently installed throughout the US is very uncertain. In this paper we evaluate the utility of electrical imaging for assessing the integrity of a PRB in situ.…”