NF-RO-MD salt fractionation and desalination system

• Main Authors: WANG MAI, LIU LIHUI, AN SHUO, CAI JINGCHENG, GUO FEI, CONG SHUO
• Format: Patent
• Language: Chinese; English
• Published: 15.12.2017
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

The invention belongs to the technical field of chemical engineering, relates to a method for industrial wastewater treatment and a membrane separation related technology, in particular to a method for salt fractionation and desalination of concentrated brine by utilizing combined multi-stage membrane separation technologies, and provides a NF-RO-MD salt fractionation and desalination system to achieve zero discharge and resource utilization of industrial wastewater. The system comprises three membrane process treatment units for nanofiltration (NF), reverse osmosis (RO) and membrane distillation (MD). Multiple schemes can be adopted for desalination and salt fractionation of the same type of wastewater, a process flow contained in each desalination and salt fractionation scheme is also varied, and arrangement and combination ways of the process flows include but are not limited to any combination and arrangement orders of the filtration method. No matter how many stages of treatment and what kind of arrangem