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Title: Effects of Natural Environmental Changes on Soil-Vapor Extraction Rates

Abstract

Remediation by soil-vapor extraction has been used for over a decade at Lawrence Livermore National Laboratory (LLNL). We have found that natural changes in environmental conditions affect the rate of soil-vapor extraction. Data on flow rate observations collected over this time are compared to in-situ measurements of several different environmental parameters (soil-gas pressure, soil-temperature, soil-moisture, Electrical Resistance Tomography (ERT), rainfall and barometric pressure). Environmental changes that lead to increased soil-moisture are associated with reduced soil-vapor extraction flow rates. We have found that the use of higher extraction vacuums combined with dual-phase extraction can help to increase pneumatic conductivity when vadose zone saturation is a problem. Daily changes in barometric pressure and soil-gas temperature were found to change flow rate measurements by as much as 10% over the course of a day.

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
894334
Report Number(s):
UCRL-CONF-220094
TRN: US200701%%381
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: Presented at: Remediation of Chlorinated and Recalcitrant Compounds, Montery, CA, United States, May 22 - May 25, 2006
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; ELECTRIC CONDUCTIVITY; FLOW RATE; LAWRENCE LIVERMORE NATIONAL LABORATORY; PNEUMATICS; SATURATION; TOMOGRAPHY

Citation Formats

Martins, S, and Gregory, S. Effects of Natural Environmental Changes on Soil-Vapor Extraction Rates. United States: N. p., 2006. Web.
Martins, S, & Gregory, S. Effects of Natural Environmental Changes on Soil-Vapor Extraction Rates. United States.
Martins, S, and Gregory, S. Thu . "Effects of Natural Environmental Changes on Soil-Vapor Extraction Rates". United States. doi:. https://www.osti.gov/servlets/purl/894334.
@article{osti_894334,
title = {Effects of Natural Environmental Changes on Soil-Vapor Extraction Rates},
author = {Martins, S and Gregory, S},
abstractNote = {Remediation by soil-vapor extraction has been used for over a decade at Lawrence Livermore National Laboratory (LLNL). We have found that natural changes in environmental conditions affect the rate of soil-vapor extraction. Data on flow rate observations collected over this time are compared to in-situ measurements of several different environmental parameters (soil-gas pressure, soil-temperature, soil-moisture, Electrical Resistance Tomography (ERT), rainfall and barometric pressure). Environmental changes that lead to increased soil-moisture are associated with reduced soil-vapor extraction flow rates. We have found that the use of higher extraction vacuums combined with dual-phase extraction can help to increase pneumatic conductivity when vadose zone saturation is a problem. Daily changes in barometric pressure and soil-gas temperature were found to change flow rate measurements by as much as 10% over the course of a day.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Mar 23 00:00:00 EST 2006},
month = {Thu Mar 23 00:00:00 EST 2006}
}

Conference:
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