Highly treated coal seam gas water safe to reinject, CSIRO study suggests
November 24, 2016 By Ground Water Canada
Australia – The results of a new study out of Australia suggest the injection of large volumes of highly treated coal seam gas product water will cause no foreseeable adverse impacts on ground water quality with the exception of the potential movement of arsenic.
However, mobilization of arsenic can largely be eliminated through a suitable pre-treatment of the injectant, most importantly through deoxygenation, the study, conducted by the Commonwealth Scientific and Industrial Research Organization concludes.
Due to the relatively short time-scale of the injection trials and in the absence of monitoring wells it was not possible to uniquely identify potential attenuation mechanisms.
Based on the current investigations, deoxygenation of the injectant is recommended until the occurrence of arsenic attenuation mechanisms is verified.
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