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.