Cleaning method of reverse osmosis membrane
A reverse osmosis membrane and cleaning agent technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem that chemical cleaning formulas and cleaning methods are not highly targeted, cannot meet the requirements of membrane cleaning, and have poor cleaning effects To solve the problems such as good or bad, to achieve the effect of easy control of the cleaning operation process, recovery of permeate flux, and continuous and stable operation
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[0028] Example 1
[0029] Toray reverse osmosis membrane element TML20-370 is selected as the experimental membrane. Under the condition of 25℃, sodium chloride and purified water are used to prepare a salt solution with a total salt content of 2000mg / L as raw water to control the water inflow. The pressure is 1.5 MPa, the inlet water flow is 10t / h, when the membrane element is in normal operation, the concentrated water pressure is 1.4 MPa, the water production is 1.5t / h, and the water salt content is 6mg / L. Add anionic polyacrylamide (molecular weight 12 million, Taihe Water Treatment Co., Ltd.) to the raw water with a concentration of 10 mg / L. After 2 hours of operation, the inlet water pressure is 1.5 MPa, the inlet water flow rate is 8 t / h, and the concentrated water pressure is 1.1 MPa. The water is 0.6t / h, and the salt content of the produced water is 39mg / L. The parameter changes indicate that the membrane has been polluted, and the desalination rate has dropped slightly...
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[0039] Example 2
[0040] Toray reverse osmosis membrane element TML20-370 was selected as the experimental membrane. At a water temperature of 25°C, pure water was used to prepare an aqueous solution with a concentration of calcium chloride and sodium carbonate of 10 ppm, and sodium chloride was added to the solution. Make the total salt content of the solution 2000mg / L. Use this solution as raw water, add anionic polyacrylamide (molecular weight 12 million, Taihe Water Treatment Co., Ltd.) to the raw water with a concentration of 10mg / L. After 2 hours of operation, the inlet pressure is 1.5 MPa and the inlet flow rate becomes 7.4t / h, the concentrated water pressure is 0.9 MPa, the produced water is 0.53t / h, and the salt content of the produced water is 45mg / L. The parameter changes indicate that the membrane has been polluted, and the salt rejection rate has dropped slightly, and the production water flux has dropped by 65%.
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