M6 PM Fate and Transport of Pollutants from Dredging and Placement
Monday, 14 November 2005: 1:50 PM - 5:30 PM in 324-326

(RAV-1116-538296) Volatile Emissions from Sediment and Dredged Material Suspensions during Remediation.

Ravikrishna, R¹, Valsaraj, K¹, Price, C², Thibodeaux, L¹, ¹ Gordon A. & Mary Cain Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA, USA² US Army ERDC, Environmental Laboratory, Vicksburg, MS, USA

ABSTRACT- Resuspension of contaminated sediments can occur during dredging and from dredged material slurries in a CDF during the filling stage. Preliminary laboratory data has shown that volatilization of chemicals from solids suspension resulting from dredging and CDF activities is a significant pathway for contaminant release. Mathematical models are required to predict the extent of evaporative releases from various scenario of sediment and dredged material suspension. Experimental data from laboratory and field studies are necessary to validate these models for incorporation into a risk assessment framework. Laboratory experiments were conducted with Indiana harbor Canal dredged material to simulate various scenarios of resuspension in an oscillating grid flux chamber. Air emission fluxes, aqueous phase chemical and solid concentrations were measured as a function of time. Comparisons with a mathematical model is presented and the effectiveness of this model will be discussed.

Key words: Resuspension, Volatilization, Dredging, CDF