Process and device for treating reverse osmosis concentrated water through dual-membrane distillation

Abstract

The invention relates to a process and device for treating reverse osmosis concentrated water through dual-membrane distillation, belonging to the technical field of membrane separation. The device comprises a reverse osmosis concentrated water trough, a first delivery pump, a first heat changer, a heating device, a membrane distillation device, a second heat exchanger, a cooling device, an osmosis membrane distillation device, a second delivery pump and a to-be-concentrated slurry storage trough, wherein the reverse osmosis concentrated water trough is sequentially connected with the first heat exchanger, the heating device and the membrane distillation device through the first delivery pump; strong brine on the membrane upstream side in the membrane distillation device returns to the first heat exchanger; the to-be-concentrated slurry storage trough is used for delivering the strong brine to the second heat exchanger through the second delivery pump to reach the slurry side of the osmosis membrane distillation device; the strong brine treated by membrane distillation sequentially passes through the second heat exchanger and the cooling device and then reaches a penetrant side of the osmosis membrane distillation device; and the reverse osmosis concentrated water is treated by a membrane distillation process and an osmosis membrane distillation process through the connection of the first heat exchanger and the second heat exchanger. According to the process and the device, high-purity fresh water is prepared by effectively using the reverse osmosis concentrated water.

Description

technical field [0001] The invention relates to an integrated membrane process for seawater, brackish water desalination or saline industrial wastewater treatment, in particular to a process and device for treating reverse osmosis concentrated water through double-membrane distillation, which belongs to the technical field of membrane separation. Background technique [0002] At present, the scarcity of water resources and serious pollution of fresh water resources have become the world's concern. Maximizing water utilization and wastewater treatment before discharge is an effective way to solve this problem. [0003] Membrane separation technology has been widely researched and developed rapidly because of its high efficiency, energy saving, environmental protection, molecular level filtration and simple filtration process, easy to control and so on. At present, membrane separation technology has been widely used in food, medicine, biology, environmental protection, chemica...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to solve the problem of environmental ecological pollution caused by directly discharging the concentrated brine after membrane distillation treatment of reverse osmosis concentrated water in the prior art, and to provide a process and device for treating reverse osmosis concentrated water through double membrane distillation

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