A Draw Solution for forward osmosis using salt of polyethyleneimine and use thereof

摘要

The present invention provides a forward osmosis induction solution characterized in that it contains a polyethyleneimine (PEI) salt having a number average molecular weight of polyethyleneimine (PEI) of 4,000 or less as an induction osmotic solute. In addition, the present invention is a method for producing a fluid (fluid) purified by the osmotic pressure of the forward osmotic induction solution containing the forward osmotic induction solute, the fluid in the fluid (fluid source) through the first membrane to the osmotic pressure A first step of permeating toward the forward osmosis inducing solution; And a second step of permeating the fluid passing through the first membrane through a second membrane through which the forward osmosis inducing solute does not pass, and using the forward osmosis induction solution according to the present invention. Provide a method. Induction solution for forward osmosis of the present invention can be easily recovered by the excellent osmotic pressure and induced solute by using polyethyleneimine salt as a polymer salt as an inducing solute, the water treatment apparatus and water treatment method using the same energy is required to separate and recover the induced solute. It is reduced and the water treatment effect is excellent.