Method and apparatus for treatment of concentrated reverse osmosis drainage through coupled forward osmosis and reverse osmosis

Abstract

The invention discloses a method and an apparatus for treatment of a concentrated reverse osmosis drainage through coupled forward osmosis and reverse osmosis. The method comprises the following steps that: a raw forward osmosis solution directly enters into a forward osmosis assembly, a concentrated reverse osmosis drainage is used as a driving solution for forward osmosis, water of the raw forward osmosis solution permeates a membrane, the concentrated reverse osmosis drain is diluted and then mixed with raw reverse osmosis water, then flows through a high-pressure pump and enters into a reverse osmosis assembly as inflowing reverse osmosis water, water penetrating to one side of the driving solution from the raw forward osmosis solution is recycled through reverse osmosis, and the concentrated reverse osmosis drainage is circulated as the driving solution for forward osmosis. The apparatus comprises a first feed pump, a second feed pump, the forward osmosis assembly, the high-pressure pump and the reverse osmosis assembly. According to the invention, the utilization rate of the concentrated reverse osmosis drain can be increased; pollution of the concentrated reverse osmosis drainage to the environment can be reduced; the method and the apparatus can also be used for liquid concentration and desalination, producing significant economic values; and the apparatus provided by the invention has the advantages of a small occupied land area, a compact structure, simple operation, low running cost and low energy consumption.

Description

technical field [0001] The invention relates to a method and a device for treating reverse osmosis concentrated drainage, in particular to a method and a device for treating reverse osmosis concentrated drainage with forward osmosis coupled with reverse osmosis. Background technique [0002] Water shortage, environmental pollution and energy crisis are the major problems facing the world at present. In the fields of seawater desalination and sewage recycling, membrane technology has become a conventional separation technology. Among them, reverse osmosis membrane technology has been widely used. In the reverse osmosis process, driven by external pressure, water molecules pass through the reverse osmosis membrane to obtain pure water. For high salt water sources, such as sea water, brackish water, etc., the external pressure needs to overcome the high osmotic pressure to obtain pure water. At the same time, a large amount of high-salt wastewater is produced. If the high sa...

AI Technical Summary

Problems solved by technology

This treatment process is similar to the addition of antiscalants, and cannot remove all the salt in the water

[0009] To sum up, the current reverse osmosis concentrated wastewater treatment process is basically by adding antiscalants and other methods to reduce the discharge of concentrated wastewater, or to remove scaling ions. There are few systems that can be completely recovered, and the process is complicated and can The problem of high consumption and high cost

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