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Deoxygenation of coal seam gas produced associated water ...
Coal seam gas (CSG) is formed nearly entirely of methane (CH4) and can be gas and in a near-liquid state in the pores of coal and adsorbed onto the coal surface. The gas is secured in its location with the surrounding pressure of the reservoir and water. To capture the gas the water pressure within the coal seams must be released. Hydraulic fracturing is carried out to achieve this.
The volume of associated water involved in CSG extraction varies and is dependent on the hydrogeology, but recent estimates are in the order of up to 300 GL/Yr. This water requires treatment so it can be used for managed aquifer recharging (MAR). The receiving hydrogeological properties of the aquifer are very important. The compatibility of the injectate must be in-line with the receiving water so as to mitigate the risk of encrustation, precipitation, scaling and bio-fouling. This is achieved through conventional physico-chemico treatment and reverse osmosis filtration.
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