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A treatment process for coal-bed-methane-extraction water

By Paul Grad |

In the development process for coal-bed methane, water is produced from wells. It is high-salinity water, with total dissolved solids (TDS) generally at least 1,000 mg/L. The main concern with coal-bed methane co-produced water is the amount of Na+ and its influence on the environment. Therefore, the water must be treated before discharge and cost-effective technologies are needed to allow the use of the water for irrigation, livestock watering and industrial uses. The technologies available include evaporation, ion exchange, electrodialysis and reverse osmosis (RO). The first pilot-scale demonstration in China for treating and recycling coal-bed methane extraction water has been conducted by a team from the Graduate University of the Chinese Academy of Sciences (Beijing; www.gucas.ac.cn), led by professor Zhang Hongxun. The team focused on coal-bed-methane co-produced water in Liulin County of Luliang City, Shanxi Province, and developed a system with sand filtration, ultrafiltration (UF) and RO to treat that water. In the process (flowsheet), the raw water is first aerated to increase the amount of dissolved oxygen. The water is then passed through a manganese sand filter, sand filter and bag filter to remove Fe, Mn and suspended…
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