IWA Publishing

Recycling of coal seam gas-associated water using vacuum membrane distillation


Courtesy of Courtesy of IWA Publishing

Coal seam gas-associated water (CSGAW), which is a by-product of coal seam gas (CSG) production typically contains significant amounts of salts and has potential environmental issues. In this study, we optimized a bench-scale vacuum membrane distillation (VMD) process with flat-sheet hydrophobic polytetrafluoroethylene (PTFE) membranes for the treatment of synthetic CSGAW (conductivity = 15 mS/cm). To study performance of the VMD process, we explored the effects of feed temperature (Tf = 60, 70, and 80°C), feed flow rate (Vf = 60, 120, and 240 mL/min), and vacuum pressure (Pv = 3, 6, and 9 kPa) on water permeability through the PTFE membrane in the VMD process. Under the optimum conditions (i.e. Tf = 80°C, Vf = 240 mL/min, Pv = 3 kPa), water permeability and rejection efficiency of salts by the VMD process were found to be 5.5 L/m2/h (LMH) and 99.9%, respectively, after 2 h filtration. However, after 8 h operation, the water permeability decreased by 70% compared with the initial flux due to the formation of fouling layer of calcium, chloride, sodium, magnesium, and potassium on the membrane surface.

Customer comments

No comments were found for Recycling of coal seam gas-associated water using vacuum membrane distillation. Be the first to comment!