Feasibility of Using Natural Zeolites to Remove Sodium from Coal Bed Methane-Produced Water
Publication: Journal of Environmental Engineering
Volume 132, Issue 12
Abstract
Coal bed methane (CBM) is naturally occurring methane, contained in coal seams saturated with water. In order to extract the CBM, large quantities of water must be pumped from the coal seams. CBM water, produced in some areas of New Mexico, contains low total dissolved solids, which can potentially be used for rangeland irrigation. The water, however, has a high sodium adsorption ratio, which can result in severe deterioration of soil permeability with repeated irrigation. The St. Cloud zeolites exhibit a low selectivity of over (Vanselow selectivity coefficients of 0.26 and usable exchange capacity of ) at the ionic strength of -laden CBM waters . Nevertheless, given the availability and low cost of natural zeolites, ion exchange experiments were conducted using packed columns to estimate a treatment cost. The operation and maintenance cost of the zeolite system was estimated to be about $3 per barrel (one barrel liters) compared with for deep well injection (primary management practice) and for soil amendment. Based on these preliminary experiments, it is evident that the ion exchange process for removal, with natural zeolites as the media, is not economical due to the low sodium selectivity.
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Acknowledgments
The writers would like to express their thanks to the St. Cloud mine, N.M. for providing the zeolite and to the Waste Education Research Consortium for partial financial support.
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© 2006 ASCE.
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Received: Mar 9, 2005
Accepted: May 10, 2006
Published online: Dec 1, 2006
Published in print: Dec 2006
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