Concurrent flow reverse osmosis film assembly, reverse osmosis system and method for treatment of salt containing water

Abstract

The invention relates to the field of water treatment and discloses a concurrent flow reverse osmosis film assembly, a reverse osmosis system and a method for treatment of salt containing water. The concurrent flow reverse osmosis film assembly comprises a reverse osmosis film, a concentrated water separating net and a fresh water separating net. A concentrated water flow channel is formed by the concentrated water separating net, and a fresh water flow channel is formed by the fresh water separating net. A raw water inlet and a concentrated water outlet are formed in the concentrated water flow channel, and a permeation side water inlet and a water producing outlet are formed in the fresh water flow channel. By using the concurrent flow reverse osmosis film assembly and the reverse osmosis system for the treatment of the salt containing water, the operating pressure and the running cost do not need to be improved, but the concentration limitation of an existing reverse osmosis system can be broken through; and the discharge quantity of final concentrated saltwater of the system is greatly reduced, the recycling efficiency of water resource can be improved, and the comprehensive treatment cost for achieving zero liquid discharge can be greatly lowered.

Description

technical field [0001] The invention relates to the field of water treatment, in particular to a parallel flow reverse osmosis membrane module, a reverse osmosis system and a method for treating brine. Background technique [0002] With the continuous improvement of environmental protection requirements, contradictions such as insufficient water resources and limited environmental capacity have become increasingly prominent. In the production processes of petrochemical, coal chemical, electric power, steel and seawater desalination, a large amount of salty wastewater will be produced. In order to reduce the amount of external drainage and improve the efficiency of water use, currently salty wastewater is generally treated by reverse osmosis-based membrane method and then recycled, which improves the efficiency of water use to a certain extent. [0003] However, due to the existence of osmotic pressure and the limitation of actual operating pressure, existing conventional re...

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Problems solved by technology

[0003] However, due to the existence of osmotic pressure and the limitation of actual operating pressure, existing conventional reverse osmosis membrane components (such as figure 1 As shown, it includes a reverse osmosis membrane 6, a concentrated water separation net 4 and a fresh water separation net 7, wherein the concentrated water separation net 4 forms a concentrated water flow channel 5, and the fresh water separation net 7 forms a fresh water flow channel 8, and the concentrated water flow channel 5 is provided with raw water The water inlet 1 and the concentrated water outlet 2, the fresh water flow channel 8 is only provided with the product water outlet 3) and the reverse osmosis system formed by the conventional reverse osmosis membrane module can only concentrate the brine to 50,000 to 70,000 mg / L usually, Severely limit the further improvement of the water recovery rate of the reverse osmosis system, and thus produce a large amount of concentrated brine

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