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Title: Exploratory study of some potential environmental impacts of CO2 sequestration in unmineable coal seams

Abstract

An initial investigation into the potential environmental impacts of CO2 sequestration in unmineable coal seams has been conducted, focusing on changes in the produced water during enhanced coalbed methane (ECBM) production, using a CO2 injection process (CO2-ECBM). A high volatile bituminous coal, Pittsburgh No. 8, was reacted with synthetic produced water and gaseous carbon dioxide at 40°C and 50 bar to evaluate the potential for mobilisation of toxic metals during CO2-ECBM/sequestration. Microscopic and X-ray diffraction analysis of the post-reaction coal samples clearly show evidence of chemical reaction and chemical analysis of the synthetic produced water shows substantial changes in composition. These results suggest that changes to the produced water chemistry and the potential for mobilising toxic trace elements from coal beds are important factors to be considered when evaluating deep, unmineable coal seams for CO2 sequestration.

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
National Energy Technology Laboratory (NETL), Pittsburgh, PA, and Morgantown, WV
Sponsoring Org.:
USDOE - Office of Fossil Energy (FE)
OSTI Identifier:
915620
Report Number(s):
DOE/NETL-IR-2007-177
Journal ID: ISSN 0957-4352 print; 1741-5101 online; TRN: US200816%%94
DOE Contract Number:
None cited
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Environment and Pollution; Journal Volume: 29; Journal Issue: 4
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; BITUMINOUS COAL; CARBON DIOXIDE; CHEMICAL ANALYSIS; CHEMICAL REACTIONS; COAL; COAL DEPOSITS; COAL SEAMS; ENVIRONMENTAL IMPACTS; TRACE AMOUNTS; WATER; WATER CHEMISTRY; X-RAY DIFFRACTION; geological sequestration; carbon dioxide; CO2 sequestration; carbon sequestration; coal bed methane; environmental impact; unmineable coal seams; toxic metals; water chemistry; toxic trace elements

Citation Formats

Hedges, S.W., Soong, Y., Jones, R.J., Harrison, D.K., Irdi, G.A., Frommell, E.A., Dilmore, R.M., and White, C.M.. Exploratory study of some potential environmental impacts of CO2 sequestration in unmineable coal seams. United States: N. p., 2007. Web. doi:10.1504/IJEP.2007.014232.
Hedges, S.W., Soong, Y., Jones, R.J., Harrison, D.K., Irdi, G.A., Frommell, E.A., Dilmore, R.M., & White, C.M.. Exploratory study of some potential environmental impacts of CO2 sequestration in unmineable coal seams. United States. doi:10.1504/IJEP.2007.014232.
Hedges, S.W., Soong, Y., Jones, R.J., Harrison, D.K., Irdi, G.A., Frommell, E.A., Dilmore, R.M., and White, C.M.. Mon . "Exploratory study of some potential environmental impacts of CO2 sequestration in unmineable coal seams". United States. doi:10.1504/IJEP.2007.014232.
@article{osti_915620,
title = {Exploratory study of some potential environmental impacts of CO2 sequestration in unmineable coal seams},
author = {Hedges, S.W. and Soong, Y. and Jones, R.J. and Harrison, D.K. and Irdi, G.A. and Frommell, E.A. and Dilmore, R.M. and White, C.M.},
abstractNote = {An initial investigation into the potential environmental impacts of CO2 sequestration in unmineable coal seams has been conducted, focusing on changes in the produced water during enhanced coalbed methane (ECBM) production, using a CO2 injection process (CO2-ECBM). A high volatile bituminous coal, Pittsburgh No. 8, was reacted with synthetic produced water and gaseous carbon dioxide at 40°C and 50 bar to evaluate the potential for mobilisation of toxic metals during CO2-ECBM/sequestration. Microscopic and X-ray diffraction analysis of the post-reaction coal samples clearly show evidence of chemical reaction and chemical analysis of the synthetic produced water shows substantial changes in composition. These results suggest that changes to the produced water chemistry and the potential for mobilising toxic trace elements from coal beds are important factors to be considered when evaluating deep, unmineable coal seams for CO2 sequestration.},
doi = {10.1504/IJEP.2007.014232},
journal = {International Journal of Environment and Pollution},
number = 4,
volume = 29,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}