New energy-saving desalination technology of highly-mineralized mine water

In order to solve the high energy consumption of highly-mineralized mine water desalination,this paper discusses five new technologies and new ideas around energy-saving desalination.Aiming at the characteristics of mine water quality with highly-mineralized mainly composed of divalent ions in the two coal mines in Northern Shaanxi,this paper proposes a moderate desalination scheme using nanofiltration membranes to selectively retain divalent ions,which has energy-saving advantages over reverse osmosis.The low-cost purification can be realized by using membrane distillation and solar energy efficient evaporation technology to treat highly-mineralized mine water in western mining areas.The microbial desalting fuel cell diffuses and transfers the ions in the desalting chamber without any pressure or driving fluid and generates electric energy as well.NF+SWRO/DTRO combined with bipolar membrane synthesis process converts sodium sulfate of crystalline salt into high value-added sodium hydroxide and sulfuric acid,which can partially offset the cost of water treatment,and is a new way to realize energy-saving desalination.