Systems for water extraction for up-concentration of organic solutes
The present invention relates to a water extraction system for up-concentration of organic solutes comprising a flow cell comprising a membrane; said membrane comprising an active layer comprising immobilized aquaporin water channels and a support layer, and said membrane having a feed side and a non-feed side; and an aqueous source solution in fluid communication with the feed side of the membrane. The system also includes an aqueous source solution in fluid communication with the feed side of the membrane and an aqueous draw solution in fluid communication with the draw side of the membrane. The aqueous source solution comprises the organic solutes. The membrane module comprises an inlet and an outlet for the aqueous draw solution. The aquaporin vesicles are formed by self-assembly of block copolymers in the presence of an aquaporin protein suspension.
1. A water extraction system for up-concentration of organic solutes, comprising:
a) a membrane module comprising a membrane, said membrane comprising (i) an active layer comprising a cross linked aromatic polyamide thin film, wherein aquaporin vesicles are incorporated and (ii) a support layer, and said membrane having a feed side and a non-feed side, wherein the non-feed side of the membrane functions as a draw side; and
b) an aqueous source solution in fluid communication with the feed side of the membrane, and
c) an aqueous draw solution in fluid communication with the draw side of the membrane,
wherein the aqueous source solution comprises the organic solutes, the organic solutes being one of amino acids, peptides, or proteins, and
wherein the membrane module comprises an inlet and an outlet for the aqueous draw solution, and
wherein said aquaporin vesicles are formed by self-assembly of block copolymers in the presence of an aquaporin protein suspension wherein a molar polymer to protein ratio is between 25 and 500.
2. The water extraction system according to claim 1 wherein said cross linked aromatic polyamide layer is formed by interfacial polymerization and said vesicles are formed from a triblock copolymer solution.
3. The water extraction system according to claim 2 wherein the triblock copolymer is a PMOXAa-PDMSb-PMOXAc copolymer.
4. The water extraction system according to claim 1 wherein said aquaporin protein suspension includes a protein comprising a plant aquaporin, a mammalian aquaporin, or a bacterial aquaporin.
5. The water extraction system according to claim 4 wherein the plant aquaporin is SoPIP2; 1.
6. The water extraction system according to claim 4 wherein the mammalian aquaporin is Aqp1.
7. The water extraction system according to claim 4 wherein the bacterial aquaporin is aquaporin-Z.
8. The water extraction system according to claim 1 wherein said support layer is a polysulfone or polyether sulfone support membrane.
9. The water extraction system according to claim 1 , wherein the system is configured for water extraction by forward osmosis (FO) said system further comprising:
d) a draw solution concentration unit.
10. The water extraction system according to claim 1 further comprising means for regeneration or anti-fouling of said membrane, said means comprising a cleaning fluid having a pH of about 2 to 11, said cleaning fluid being selected from a solution of an organic acid or a chelating agent.
11. The water extraction system according to claim 10 wherein the organic acid is citric acid.
12. The water extraction system according to claim 10 , wherein the chelating agent is ethylenediaminetetraacetic acid (EDTA).