ESSIE (The Engineering School for Sustainability, Infrastructure and
Environment) is hosting the 2012 Darcy Lecture, Wednesday April 4th, 3 pm in Room 282 Reitz Union
Speaker: S. Majid Hassanizadeh, Ph.D., Professor of hydrogeology on the faculty of geosciences at Utrecht University and senior adviser with the Soil and Groundwater Department of Deltares research institute.
Hassanizadeh's research focuses on flow and transport in porous media through theory development, experimental studies, and modeling work. His current research includes pore-network modeling and experimental studies of two-phase flow, pore-network modeling of adsorbing solutes in unsaturated soil, transport of colloids and microorganisms in variably saturated soil, and novel remediation methods for NAPL-polluted soils.
Seminar Title: Transport of Viruses in Partially Saturated Soil and Groundwater
Transport of Viruses in Partially Saturated Soil and Groundwater
Surface water is often used for recharge of aquifers used in drinking
water production. But it can be contaminated with pathogenic
microorganisms and viruses from wastewater discharges or manure runoff.
These pathogens have to be removed to produce safe drinking water such
as passing surface water through soil. However, to assure production of
safe drinking water from surface water, adequate travel times and travel
distances are needed. In this regard, it is important to determine
various factors that affect the rate of removal of pathogenic viruses
during soil passage. These factors include hydraulic conditions (such as
flow velocity and saturation) and geochemical conditions (pH, ionic
strength, concentration of calcium). In this lecture, Hassanizadeh will:
*Present the results of a large number of laboratory and field
experiments involving bacteriophages (viruses affecting bacteria), which
were carried out under a variety of conditions under steady-state flow
*Show how the data from the experiments was used to derive
(empirical) relationships between removal rate coefficients and
geochemical conditions as well as saturation.
*Explain how in the case of unsaturated flow, the role of air/water
interfaces in the removal of viruses was also investigated.
*Present findings from experiments performed under transient flow
conditions where saturation has been changed significantly.
*Show how the experiments, as well as other researchers' results, have
demonstrated that both drainage and imbibition fronts cause a
remobilization of adsorbed viruses.
*Discuss the mechanisms behind this remobilization.
*Provide evidence from pore-scale visualization experiments performed
in a micromodel.
There will be additional opportunities to meet with Majid on Wednesday
or Thursday. Contact Mike Annable if you are interested
([log in to unmask] or 392-3294)