Membrane method salt separation resourceful treatment system for high-salinity wastewater in petroleum refining industry

The invention discloses a membrane-method salt separation resourceful treatment system for high-salinity wastewater in the petroleum refining industry. The system comprises an efficient sedimentationtank, a tubular ultrafiltration system, an ion exchange system, a first-stage reverse osmosis system, an A/O + MBR device, a first-stage nanofiltration system, a second-stage nanofiltration system, asecond-stage reverse osmosis system, a high-valence salt evaporation crystallizer, a low-valence salt evaporation crystallizer and a miscellaneous salt evaporation crystallizer. The system employs thetwo-stage reverse osmosis system, a two-stage nanofiltration system and an A/O + MBR device as main treatment units, and a pretreatment process and an evaporative crystallization technology are combined to form a membrane-method salt separation resourceful treatment process for high-salinity wastewater in the petroleum refining industry, so that the defects that the high-salinity wastewater in the petroleum refining industry is difficult to resist impact of organic matters and poor in salt separation effect and a high-grade industrial-level product is difficult to product can be solved; besides, zero emission and resource utilization of high-salinity wastewater in the petroleum refining industry are achieved, and the recovery rate is increased.