Date of Award

12-2008

Degree Name

Master of Science

Department

Geosciences

First Advisor

Dr. Duane R. Hampton

Second Advisor

Dr. Alan E. Kehew

Third Advisor

Dr. Dan Cassidy

Access Setting

Masters Thesis-Campus Only

Abstract

Spilled gasoline or free product floating on groundwater is being monitored and recovered at many gas stations. Pall Corporation's Schumasoil® well screen is made by melting plastic beads, has small pores, high open area and is hydrophobic. (8) The main questions about this well screen are: 1) What pore size Schumasoil screen is best for a given aquifer grain-size distribution? and 2) How do these screens perform compared to well screens commonly used at free product sites? We performed laboratory experiments using four wells, one of each pore size (200, 80, 40 and 20 microns), in five different sands, filled with water and dyed kerosene.

All of these screens were successful in imbibing kerosene helping them connect better with the kerosene in the aquifer. The 20-micron screen outperformed all other Schumasoil® screens in most sands. This screen's small pores attract kerosene by capillarity, becoming highly saturated. The 200-micron screen did better in two sands, and was best at pumping water.

The 20 and 200-micron Schumasoil® screens were tested alongside wirewrapped PVC and stainless steel screens. The 20-micron screen significantly outperformed both of these and the 200-micron screen.

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