A reverse osmosis concentrated seawater treatment system and method
A technology for processing system and concentrated seawater, applied in the field of water treatment, can solve the problems of large system investment, large area, high operating temperature, etc., and achieve the effect of large evaporation area, reduced operating cost, and low operating temperature
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Embodiment 1
[0036] A method for treating concentrated seawater by reverse osmosis, comprising the steps of:
[0037] (1) Use above-mentioned a kind of reverse osmosis concentrated seawater treatment system;
[0038] (2) Reverse osmosis concentrated seawater (salt content 45887mg / L, pH 8.0, in which Ca 2+ 521mg / L, Mg 2+ 1620mg / L) into the security filter 1 (using a filter element with a filtration accuracy of 5 μm) to filter, remove particulate impurities, and obtain pretreated product water;
[0039] (3) After adjusting the pH to 4 with the acid fed from the acid dosing pump 22, the pretreated water is pressurized to 1.5MPa by the high-pressure pump 2, and passed into the nanofiltration membrane element 3 (using XCN model) for primary softening treatment to remove hardness ions in the range of 70% to 90% and organic matter with a molecular weight of more than 200 to obtain nanofiltration soft water (nanofiltration soft water has a salt content of 38100mg / L, wherein Ca 2+ 196mg / L, Mg 2...
Embodiment 2
[0046] A method for treating concentrated seawater by reverse osmosis, comprising the steps of:
[0047] (1) Use above-mentioned a kind of reverse osmosis concentrated seawater treatment system;
[0048] (2) Reverse osmosis concentrated seawater (salt content 47620mg / L, pH 8.0, in which Ca 2+ 572mg / L, Mg 2+ 1690mg / L) into the security filter 1 (using a filter element with a filtration accuracy of 5 μm) to filter, remove particulate impurities, and obtain pretreated product water;
[0049] (3) Adjust the pH to 2 with the acid fed from the acid dosing pump 22 for the pretreated product water, pressurize it to 2.5 MPa through the high pressure pump 2, and pass it into the nanofiltration membrane element 3 (using HYDRApro model or DK model) Perform primary softening treatment to remove hardness ions in the range of 70% to 90% and organic matter with a molecular weight above 200 to obtain nanofiltration soft water (the salt content of nanofiltration soft water is 39120mg / L, where...
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