Characteristics and utilizations of high salt water that comes from CBM development in western mining

• Published in: Desalination and water treatment 2018-07, Vol.119, p.198-205
• Main Authors: Ge, Guangrong, Guo, Yiding, Li, Binghong
• Format: Article
• Language: English
• Subjects: Coal-bed methane produced water; High salt characteristics; Utilizations; Western mining area
• ISSN: 1944-3986
• DOI: 10.5004/dwt.2018.22047

The large-scale exploitation of coal-bed methane (CBM) produces a large amount of water simultaneously, especially in Western mining areas of China, where water resource is scarce and the ecosystem is fragile. Improper disposal of the produced water will cause serious environmental pollution and ecological damage. Therefore, the optimal collection scheme, purification process and resource utilization are the subject of urgent research. In this paper, the study found that western mining Jurassic middle Yanan group overall in the higher salinity of groundwater, through the water chemical analysis and hydrological studies have found that high hardness, high salinity and high chloride is the typical mining area of CBM produced water quality, water chemical types are gradually by bicarbonate to sulfate and chlorate, salinity increased; Based on the analysis of fracturing fluid composition of coal-bed gas, the effect of fracturing fluid on the water quality of CBM is relatively small. By analyzing and comparing different schemes, it is recommended that the appropriate scale centralization scheme can be used to set up the collecting pipeline and reduce the cost. According to the characteristics of water quality, treatment requirements and current technological level, it is recommended to apply softening, coagulate sedimentation and filtration + electrodialysis technology to treat CBM in this area.